arch/parisc/math-emu/fpudispatch.c

   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/bug.h>
  54 #include <linux/kernel.h>
  55 #include <asm/processor.h>
  56 /* #include <sys/debug.h> */
  57 /* #include <machine/sys/mdep_private.h> */
  58
  59 #define COPR_INST 0x30000000
  60
  61 /*
  62  * definition of extru macro.  If pos and len are constants, the compiler
  63  * will generate an extru instruction when optimized
  64  */
  65 #define extru(r,pos,len)        (((r) >> (31-(pos))) & (( 1 << (len)) - 1))
  66 /* definitions of bit field locations in the instruction */
  67 #define fpmajorpos 5
  68 #define fpr1pos 10
  69 #define fpr2pos 15
  70 #define fptpos  31
  71 #define fpsubpos 18
  72 #define fpclass1subpos 16
  73 #define fpclasspos 22
  74 #define fpfmtpos 20
  75 #define fpdfpos 18
  76 #define fpnulpos 26
  77 /*
  78  * the following are the extra bits for the 0E major op
  79  */
  80 #define fpxr1pos 24
  81 #define fpxr2pos 19
  82 #define fpxtpos 25
  83 #define fpxpos 23
  84 #define fp0efmtpos 20
  85 /*
  86  * the following are for the multi-ops
  87  */
  88 #define fprm1pos 10
  89 #define fprm2pos 15
  90 #define fptmpos 31
  91 #define fprapos 25
  92 #define fptapos 20
  93 #define fpmultifmt 26
  94 /*
  95  * the following are for the fused FP instructions
  96  */
  97      /* fprm1pos 10 */
  98      /* fprm2pos 15 */
  99 #define fpraupos 18
 100 #define fpxrm2pos 19
 101      /* fpfmtpos 20 */
 102 #define fpralpos 23
 103 #define fpxrm1pos 24
 104      /* fpxtpos 25 */
 105 #define fpfusedsubop 26
 106      /* fptpos  31 */
 107
 108 /*
 109  * offset to constant zero in the FP emulation registers
 110  */
 111 #define fpzeroreg (32*sizeof(double)/sizeof(u_int))
 112
 113 /*
 114  * extract the major opcode from the instruction
 115  */
 116 #define get_major(op) extru(op,fpmajorpos,6)
 117 /*
 118  * extract the two bit class field from the FP instruction. The class is at bit
 119  * positions 21-22
 120  */
 121 #define get_class(op) extru(op,fpclasspos,2)
 122 /*
 123  * extract the 3 bit subop field.  For all but class 1 instructions, it is
 124  * located at bit positions 16-18
 125  */
 126 #define get_subop(op) extru(op,fpsubpos,3)
 127 /*
 128  * extract the 2 or 3 bit subop field from class 1 instructions.  It is located
 129  * at bit positions 15-16 (PA1.1) or 14-16 (PA2.0)
 130  */
 131 #define get_subop1_PA1_1(op) extru(op,fpclass1subpos,2) /* PA89 (1.1) fmt */
 132 #define get_subop1_PA2_0(op) extru(op,fpclass1subpos,3) /* PA 2.0 fmt */
 133
 134 /* definitions of unimplemented exceptions */
 135 #define MAJOR_0C_EXCP   0x09
 136 #define MAJOR_0E_EXCP   0x0b
 137 #define MAJOR_06_EXCP   0x03
 138 #define MAJOR_26_EXCP   0x23
 139 #define MAJOR_2E_EXCP   0x2b
 140 #define PA83_UNIMP_EXCP 0x01
 141
 142 /*
 143  * Special Defines for TIMEX specific code
 144  */
 145
 146 #define FPU_TYPE_FLAG_POS (EM_FPU_TYPE_OFFSET>>2)
 147 #define TIMEX_ROLEX_FPU_MASK (TIMEX_EXTEN_FLAG|ROLEX_EXTEN_FLAG)
 148
 149 /*
 150  * Static function definitions
 151  */
 152 #define _PROTOTYPES
 153 #if defined(_PROTOTYPES) || defined(_lint)
 154 static u_int decode_0c(u_int, u_int, u_int, u_int *);
 155 static u_int decode_0e(u_int, u_int, u_int, u_int *);
 156 static u_int decode_06(u_int, u_int *);
 157 static u_int decode_26(u_int, u_int *);
 158 static u_int decode_2e(u_int, u_int *);
 159 static void update_status_cbit(u_int *, u_int, u_int, u_int);
 160 #else /* !_PROTOTYPES&&!_lint */
 161 static u_int decode_0c();
 162 static u_int decode_0e();
 163 static u_int decode_06();
 164 static u_int decode_26();
 165 static u_int decode_2e();
 166 static void update_status_cbit();
 167 #endif /* _PROTOTYPES&&!_lint */
 168
 169 #define VASSERT(x)
 170
 171 static void parisc_linux_get_fpu_type(u_int fpregs[])
 172 {
 173         /* on pa-linux the fpu type is not filled in by the
 174          * caller; it is constructed here
 175          */
 176         if (boot_cpu_data.cpu_type == pcxs)
 177                 fpregs[FPU_TYPE_FLAG_POS] = TIMEX_EXTEN_FLAG;
 178         else if (boot_cpu_data.cpu_type == pcxt ||
 179                  boot_cpu_data.cpu_type == pcxt_)
 180                 fpregs[FPU_TYPE_FLAG_POS] = ROLEX_EXTEN_FLAG;
 181         else if (boot_cpu_data.cpu_type >= pcxu)
 182                 fpregs[FPU_TYPE_FLAG_POS] = PA2_0_FPU_FLAG;
 183 }
 184
 185 /*
 186  * this routine will decode the excepting floating point instruction and
 187  * call the appropriate emulation routine.
 188  * It is called by decode_fpu with the following parameters:
 189  * fpudispatch(current_ir, unimplemented_code, 0, &Fpu_register)
 190  * where current_ir is the instruction to be emulated,
 191  * unimplemented_code is the exception_code that the hardware generated
 192  * and &Fpu_register is the address of emulated FP reg 0.
 193  */
 194 u_int
 195 fpudispatch(u_int ir, u_int excp_code, u_int holder, u_int fpregs[])
 196 {
 197         u_int class, subop;
 198         u_int fpu_type_flags;
 199
 200         /* All FP emulation code assumes that ints are 4-bytes in length */
 201         VASSERT(sizeof(int) == 4);
 202
 203         parisc_linux_get_fpu_type(fpregs);
 204
 205         fpu_type_flags=fpregs[FPU_TYPE_FLAG_POS];  /* get fpu type flags */
 206
 207         class = get_class(ir);
 208         if (class == 1) {
 209                 if  (fpu_type_flags & PA2_0_FPU_FLAG)
 210                         subop = get_subop1_PA2_0(ir);
 211                 else
 212                         subop = get_subop1_PA1_1(ir);
 213         }
 214         else
 215                 subop = get_subop(ir);
 216
 217         if (FPUDEBUG) printk("class %d subop %d\n", class, subop);
 218
 219         switch (excp_code) {
 220                 case MAJOR_0C_EXCP:
 221                 case PA83_UNIMP_EXCP:
 222                         return(decode_0c(ir,class,subop,fpregs));
 223                 case MAJOR_0E_EXCP:
 224                         return(decode_0e(ir,class,subop,fpregs));
 225                 case MAJOR_06_EXCP:
 226                         return(decode_06(ir,fpregs));
 227                 case MAJOR_26_EXCP:
 228                         return(decode_26(ir,fpregs));
 229                 case MAJOR_2E_EXCP:
 230                         return(decode_2e(ir,fpregs));
 231                 default:
 232                         /* "crashme Night Gallery painting nr 2. (asm_crash.s).
 233                          * This was fixed for multi-user kernels, but
 234                          * workstation kernels had a panic here.  This allowed
 235                          * any arbitrary user to panic the kernel by executing
 236                          * setting the FP exception registers to strange values
 237                          * and generating an emulation trap.  The emulation and
 238                          * exception code must never be able to panic the
 239                          * kernel.
 240                          */
 241                         return(UNIMPLEMENTEDEXCEPTION);
 242         }
 243 }
 244
 245 /*
 246  * this routine is called by $emulation_trap to emulate a coprocessor
 247  * instruction if one doesn't exist
 248  */
 249 u_int
 250 emfpudispatch(u_int ir, u_int dummy1, u_int dummy2, u_int fpregs[])
 251 {
 252         u_int class, subop, major;
 253         u_int fpu_type_flags;
 254
 255         /* All FP emulation code assumes that ints are 4-bytes in length */
 256         VASSERT(sizeof(int) == 4);
 257
 258         fpu_type_flags=fpregs[FPU_TYPE_FLAG_POS];  /* get fpu type flags */
 259
 260         major = get_major(ir);
 261         class = get_class(ir);
 262         if (class == 1) {
 263                 if  (fpu_type_flags & PA2_0_FPU_FLAG)
 264                         subop = get_subop1_PA2_0(ir);
 265                 else
 266                         subop = get_subop1_PA1_1(ir);
 267         }
 268         else
 269                 subop = get_subop(ir);
 270         switch (major) {
 271                 case 0x0C:
 272                         return(decode_0c(ir,class,subop,fpregs));
 273                 case 0x0E:
 274                         return(decode_0e(ir,class,subop,fpregs));
 275                 case 0x06:
 276                         return(decode_06(ir,fpregs));
 277                 case 0x26:
 278                         return(decode_26(ir,fpregs));
 279                 case 0x2E:
 280                         return(decode_2e(ir,fpregs));
 281                 default:
 282                         return(PA83_UNIMP_EXCP);
 283         }
 284 }
 285
 286
 287 static u_int
 288 decode_0c(u_int ir, u_int class, u_int subop, u_int fpregs[])
 289 {
 290         u_int r1,r2,t;          /* operand register offsets */
 291         u_int fmt;              /* also sf for class 1 conversions */
 292         u_int  df;              /* for class 1 conversions */
 293         u_int *status;
 294         u_int retval, local_status;
 295         u_int fpu_type_flags;
 296
 297         if (ir == COPR_INST) {
 298                 fpregs[0] = EMULATION_VERSION << 11;
 299                 return(NOEXCEPTION);
 300         }
 301         status = &fpregs[0];    /* fp status register */
 302         local_status = fpregs[0]; /* and local copy */
 303         r1 = extru(ir,fpr1pos,5) * sizeof(double)/sizeof(u_int);
 304         if (r1 == 0)            /* map fr0 source to constant zero */
 305                 r1 = fpzeroreg;
 306         t = extru(ir,fptpos,5) * sizeof(double)/sizeof(u_int);
 307         if (t == 0 && class != 2)       /* don't allow fr0 as a dest */
 308                 return(MAJOR_0C_EXCP);
 309         fmt = extru(ir,fpfmtpos,2);     /* get fmt completer */
 310
 311         switch (class) {
 312             case 0:
 313                 switch (subop) {
 314                         case 0: /* COPR 0,0 emulated above*/
 315                         case 1:
 316                                 return(MAJOR_0C_EXCP);
 317                         case 2: /* FCPY */
 318                                 switch (fmt) {
 319                                     case 2: /* illegal */
 320                                         return(MAJOR_0C_EXCP);
 321                                     case 3: /* quad */
 322                                         t &= ~3;  /* force to even reg #s */
 323                                         r1 &= ~3;
 324                                         fpregs[t+3] = fpregs[r1+3];
 325                                         fpregs[t+2] = fpregs[r1+2];
 326                                     case 1: /* double */
 327                                         fpregs[t+1] = fpregs[r1+1];
 328                                     case 0: /* single */
 329                                         fpregs[t] = fpregs[r1];
 330                                         return(NOEXCEPTION);
 331                                 }
 332                         case 3: /* FABS */
 333                                 switch (fmt) {
 334                                     case 2: /* illegal */
 335                                         return(MAJOR_0C_EXCP);
 336                                     case 3: /* quad */
 337                                         t &= ~3;  /* force to even reg #s */
 338                                         r1 &= ~3;
 339                                         fpregs[t+3] = fpregs[r1+3];
 340                                         fpregs[t+2] = fpregs[r1+2];
 341                                     case 1: /* double */
 342                                         fpregs[t+1] = fpregs[r1+1];
 343                                     case 0: /* single */
 344                                         /* copy and clear sign bit */
 345                                         fpregs[t] = fpregs[r1] & 0x7fffffff;
 346                                         return(NOEXCEPTION);
 347                                 }
 348                         case 6: /* FNEG */
 349                                 switch (fmt) {
 350                                     case 2: /* illegal */
 351                                         return(MAJOR_0C_EXCP);
 352                                     case 3: /* quad */
 353                                         t &= ~3;  /* force to even reg #s */
 354                                         r1 &= ~3;
 355                                         fpregs[t+3] = fpregs[r1+3];
 356                                         fpregs[t+2] = fpregs[r1+2];
 357                                     case 1: /* double */
 358                                         fpregs[t+1] = fpregs[r1+1];
 359                                     case 0: /* single */
 360                                         /* copy and invert sign bit */
 361                                         fpregs[t] = fpregs[r1] ^ 0x80000000;
 362                                         return(NOEXCEPTION);
 363                                 }
 364                         case 7: /* FNEGABS */
 365                                 switch (fmt) {
 366                                     case 2: /* illegal */
 367                                         return(MAJOR_0C_EXCP);
 368                                     case 3: /* quad */
 369                                         t &= ~3;  /* force to even reg #s */
 370                                         r1 &= ~3;
 371                                         fpregs[t+3] = fpregs[r1+3];
 372                                         fpregs[t+2] = fpregs[r1+2];
 373                                     case 1: /* double */
 374                                         fpregs[t+1] = fpregs[r1+1];
 375                                     case 0: /* single */
 376                                         /* copy and set sign bit */
 377                                         fpregs[t] = fpregs[r1] | 0x80000000;
 378                                         return(NOEXCEPTION);
 379                                 }
 380                         case 4: /* FSQRT */
 381                                 switch (fmt) {
 382                                     case 0:
 383                                         return(sgl_fsqrt(&fpregs[r1],0,
 384                                                 &fpregs[t],status));
 385                                     case 1:
 386                                         return(dbl_fsqrt(&fpregs[r1],0,
 387                                                 &fpregs[t],status));
 388                                     case 2:
 389                                     case 3: /* quad not implemented */
 390                                         return(MAJOR_0C_EXCP);
 391                                 }
 392                         case 5: /* FRND */
 393                                 switch (fmt) {
 394                                     case 0:
 395                                         return(sgl_frnd(&fpregs[r1],0,
 396                                                 &fpregs[t],status));
 397                                     case 1:
 398                                         return(dbl_frnd(&fpregs[r1],0,
 399                                                 &fpregs[t],status));
 400                                     case 2:
 401                                     case 3: /* quad not implemented */
 402                                         return(MAJOR_0C_EXCP);
 403                                 }
 404                 } /* end of switch (subop) */
 405
 406         case 1: /* class 1 */
 407                 df = extru(ir,fpdfpos,2); /* get dest format */
 408                 if ((df & 2) || (fmt & 2)) {
 409                         /*
 410                          * fmt's 2 and 3 are illegal of not implemented
 411                          * quad conversions
 412                          */
 413                         return(MAJOR_0C_EXCP);
 414                 }
 415                 /*
 416                  * encode source and dest formats into 2 bits.
 417                  * high bit is source, low bit is dest.
 418                  * bit = 1 --> double precision
 419                  */
 420                 fmt = (fmt << 1) | df;
 421                 switch (subop) {
 422                         case 0: /* FCNVFF */
 423                                 switch(fmt) {
 424                                     case 0: /* sgl/sgl */
 425                                         return(MAJOR_0C_EXCP);
 426                                     case 1: /* sgl/dbl */
 427                                         return(sgl_to_dbl_fcnvff(&fpregs[r1],0,
 428                                                 &fpregs[t],status));
 429                                     case 2: /* dbl/sgl */
 430                                         return(dbl_to_sgl_fcnvff(&fpregs[r1],0,
 431                                                 &fpregs[t],status));
 432                                     case 3: /* dbl/dbl */
 433                                         return(MAJOR_0C_EXCP);
 434                                 }
 435                         case 1: /* FCNVXF */
 436                                 switch(fmt) {
 437                                     case 0: /* sgl/sgl */
 438                                         return(sgl_to_sgl_fcnvxf(&fpregs[r1],0,
 439                                                 &fpregs[t],status));
 440                                     case 1: /* sgl/dbl */
 441                                         return(sgl_to_dbl_fcnvxf(&fpregs[r1],0,
 442                                                 &fpregs[t],status));
 443                                     case 2: /* dbl/sgl */
 444                                         return(dbl_to_sgl_fcnvxf(&fpregs[r1],0,
 445                                                 &fpregs[t],status));
 446                                     case 3: /* dbl/dbl */
 447                                         return(dbl_to_dbl_fcnvxf(&fpregs[r1],0,
 448                                                 &fpregs[t],status));
 449                                 }
 450                         case 2: /* FCNVFX */
 451                                 switch(fmt) {
 452                                     case 0: /* sgl/sgl */
 453                                         return(sgl_to_sgl_fcnvfx(&fpregs[r1],0,
 454                                                 &fpregs[t],status));
 455                                     case 1: /* sgl/dbl */
 456                                         return(sgl_to_dbl_fcnvfx(&fpregs[r1],0,
 457                                                 &fpregs[t],status));
 458                                     case 2: /* dbl/sgl */
 459                                         return(dbl_to_sgl_fcnvfx(&fpregs[r1],0,
 460                                                 &fpregs[t],status));
 461                                     case 3: /* dbl/dbl */
 462                                         return(dbl_to_dbl_fcnvfx(&fpregs[r1],0,
 463                                                 &fpregs[t],status));
 464                                 }
 465                         case 3: /* FCNVFXT */
 466                                 switch(fmt) {
 467                                     case 0: /* sgl/sgl */
 468                                         return(sgl_to_sgl_fcnvfxt(&fpregs[r1],0,
 469                                                 &fpregs[t],status));
 470                                     case 1: /* sgl/dbl */
 471                                         return(sgl_to_dbl_fcnvfxt(&fpregs[r1],0,
 472                                                 &fpregs[t],status));
 473                                     case 2: /* dbl/sgl */
 474                                         return(dbl_to_sgl_fcnvfxt(&fpregs[r1],0,
 475                                                 &fpregs[t],status));
 476                                     case 3: /* dbl/dbl */
 477                                         return(dbl_to_dbl_fcnvfxt(&fpregs[r1],0,
 478                                                 &fpregs[t],status));
 479                                 }
 480                         case 5: /* FCNVUF (PA2.0 only) */
 481                                 switch(fmt) {
 482                                     case 0: /* sgl/sgl */
 483                                         return(sgl_to_sgl_fcnvuf(&fpregs[r1],0,
 484                                                 &fpregs[t],status));
 485                                     case 1: /* sgl/dbl */
 486                                         return(sgl_to_dbl_fcnvuf(&fpregs[r1],0,
 487                                                 &fpregs[t],status));
 488                                     case 2: /* dbl/sgl */
 489                                         return(dbl_to_sgl_fcnvuf(&fpregs[r1],0,
 490                                                 &fpregs[t],status));
 491                                     case 3: /* dbl/dbl */
 492                                         return(dbl_to_dbl_fcnvuf(&fpregs[r1],0,
 493                                                 &fpregs[t],status));
 494                                 }
 495                         case 6: /* FCNVFU (PA2.0 only) */
 496                                 switch(fmt) {
 497                                     case 0: /* sgl/sgl */
 498                                         return(sgl_to_sgl_fcnvfu(&fpregs[r1],0,
 499                                                 &fpregs[t],status));
 500                                     case 1: /* sgl/dbl */
 501                                         return(sgl_to_dbl_fcnvfu(&fpregs[r1],0,
 502                                                 &fpregs[t],status));
 503                                     case 2: /* dbl/sgl */
 504                                         return(dbl_to_sgl_fcnvfu(&fpregs[r1],0,
 505                                                 &fpregs[t],status));
 506                                     case 3: /* dbl/dbl */
 507                                         return(dbl_to_dbl_fcnvfu(&fpregs[r1],0,
 508                                                 &fpregs[t],status));
 509                                 }
 510                         case 7: /* FCNVFUT (PA2.0 only) */
 511                                 switch(fmt) {
 512                                     case 0: /* sgl/sgl */
 513                                         return(sgl_to_sgl_fcnvfut(&fpregs[r1],0,
 514                                                 &fpregs[t],status));
 515                                     case 1: /* sgl/dbl */
 516                                         return(sgl_to_dbl_fcnvfut(&fpregs[r1],0,
 517                                                 &fpregs[t],status));
 518                                     case 2: /* dbl/sgl */
 519                                         return(dbl_to_sgl_fcnvfut(&fpregs[r1],0,
 520                                                 &fpregs[t],status));
 521                                     case 3: /* dbl/dbl */
 522                                         return(dbl_to_dbl_fcnvfut(&fpregs[r1],0,
 523                                                 &fpregs[t],status));
 524                                 }
 525                         case 4: /* undefined */
 526                                 return(MAJOR_0C_EXCP);
 527                 } /* end of switch subop */
 528
 529         case 2: /* class 2 */
 530                 fpu_type_flags=fpregs[FPU_TYPE_FLAG_POS];
 531                 r2 = extru(ir, fpr2pos, 5) * sizeof(double)/sizeof(u_int);
 532                 if (r2 == 0)
 533                         r2 = fpzeroreg;
 534                 if  (fpu_type_flags & PA2_0_FPU_FLAG) {
 535                         /* FTEST if nullify bit set, otherwise FCMP */
 536                         if (extru(ir, fpnulpos, 1)) {  /* FTEST */
 537                                 switch (fmt) {
 538                                     case 0:
 539                                         /*
 540                                          * arg0 is not used
 541                                          * second param is the t field used for
 542                                          * ftest,acc and ftest,rej
 543                                          * third param is the subop (y-field)
 544                                          */
 545                                         BUG();
 546                                         /* Unsupported
 547                                          * return(ftest(0L,extru(ir,fptpos,5),
 548                                          *       &fpregs[0],subop));
 549                                          */
 550                                     case 1:
 551                                     case 2:
 552                                     case 3:
 553                                         return(MAJOR_0C_EXCP);
 554                                 }
 555                         } else {  /* FCMP */
 556                                 switch (fmt) {
 557                                     case 0:
 558                                         retval = sgl_fcmp(&fpregs[r1],
 559                                                 &fpregs[r2],extru(ir,fptpos,5),
 560                                                 &local_status);
 561                                         update_status_cbit(status,local_status,
 562                                                 fpu_type_flags, subop);
 563                                         return(retval);
 564                                     case 1:
 565                                         retval = dbl_fcmp(&fpregs[r1],
 566                                                 &fpregs[r2],extru(ir,fptpos,5),
 567                                                 &local_status);
 568                                         update_status_cbit(status,local_status,
 569                                                 fpu_type_flags, subop);
 570                                         return(retval);
 571                                     case 2: /* illegal */
 572                                     case 3: /* quad not implemented */
 573                                         return(MAJOR_0C_EXCP);
 574                                 }
 575                         }
 576                 }  /* end of if for PA2.0 */
 577                 else {  /* PA1.0 & PA1.1 */
 578                     switch (subop) {
 579                         case 2:
 580                         case 3:
 581                         case 4:
 582                         case 5:
 583                         case 6:
 584                         case 7:
 585                                 return(MAJOR_0C_EXCP);
 586                         case 0: /* FCMP */
 587                                 switch (fmt) {
 588                                     case 0:
 589                                         retval = sgl_fcmp(&fpregs[r1],
 590                                                 &fpregs[r2],extru(ir,fptpos,5),
 591                                                 &local_status);
 592                                         update_status_cbit(status,local_status,
 593                                                 fpu_type_flags, subop);
 594                                         return(retval);
 595                                     case 1:
 596                                         retval = dbl_fcmp(&fpregs[r1],
 597                                                 &fpregs[r2],extru(ir,fptpos,5),
 598                                                 &local_status);
 599                                         update_status_cbit(status,local_status,
 600                                                 fpu_type_flags, subop);
 601                                         return(retval);
 602                                     case 2: /* illegal */
 603                                     case 3: /* quad not implemented */
 604                                         return(MAJOR_0C_EXCP);
 605                                 }
 606                         case 1: /* FTEST */
 607                                 switch (fmt) {
 608                                     case 0:
 609                                         /*
 610                                          * arg0 is not used
 611                                          * second param is the t field used for
 612                                          * ftest,acc and ftest,rej
 613                                          * third param is the subop (y-field)
 614                                          */
 615                                         BUG();
 616                                         /* unsupported
 617                                          * return(ftest(0L,extru(ir,fptpos,5),
 618                                          *     &fpregs[0],subop));
 619                                          */
 620                                     case 1:
 621                                     case 2:
 622                                     case 3:
 623                                         return(MAJOR_0C_EXCP);
 624                                 }
 625                     } /* end of switch subop */
 626                 } /* end of else for PA1.0 & PA1.1 */
 627         case 3: /* class 3 */
 628                 r2 = extru(ir,fpr2pos,5) * sizeof(double)/sizeof(u_int);
 629                 if (r2 == 0)
 630                         r2 = fpzeroreg;
 631                 switch (subop) {
 632                         case 5:
 633                         case 6:
 634                         case 7:
 635                                 return(MAJOR_0C_EXCP);
 636
 637                         case 0: /* FADD */
 638                                 switch (fmt) {
 639                                     case 0:
 640                                         return(sgl_fadd(&fpregs[r1],&fpregs[r2],
 641                                                 &fpregs[t],status));
 642                                     case 1:
 643                                         return(dbl_fadd(&fpregs[r1],&fpregs[r2],
 644                                                 &fpregs[t],status));
 645                                     case 2: /* illegal */
 646                                     case 3: /* quad not implemented */
 647                                         return(MAJOR_0C_EXCP);
 648                                 }
 649                         case 1: /* FSUB */
 650                                 switch (fmt) {
 651                                     case 0:
 652                                         return(sgl_fsub(&fpregs[r1],&fpregs[r2],
 653                                                 &fpregs[t],status));
 654                                     case 1:
 655                                         return(dbl_fsub(&fpregs[r1],&fpregs[r2],
 656                                                 &fpregs[t],status));
 657                                     case 2: /* illegal */
 658                                     case 3: /* quad not implemented */
 659                                         return(MAJOR_0C_EXCP);
 660                                 }
 661                         case 2: /* FMPY */
 662                                 switch (fmt) {
 663                                     case 0:
 664                                         return(sgl_fmpy(&fpregs[r1],&fpregs[r2],
 665                                                 &fpregs[t],status));
 666                                     case 1:
 667                                         return(dbl_fmpy(&fpregs[r1],&fpregs[r2],
 668                                                 &fpregs[t],status));
 669                                     case 2: /* illegal */
 670                                     case 3: /* quad not implemented */
 671                                         return(MAJOR_0C_EXCP);
 672                                 }
 673                         case 3: /* FDIV */
 674                                 switch (fmt) {
 675                                     case 0:
 676                                         return(sgl_fdiv(&fpregs[r1],&fpregs[r2],
 677                                                 &fpregs[t],status));
 678                                     case 1:
 679                                         return(dbl_fdiv(&fpregs[r1],&fpregs[r2],
 680                                                 &fpregs[t],status));
 681                                     case 2: /* illegal */
 682                                     case 3: /* quad not implemented */
 683                                         return(MAJOR_0C_EXCP);
 684                                 }
 685                         case 4: /* FREM */
 686                                 switch (fmt) {
 687                                     case 0:
 688                                         return(sgl_frem(&fpregs[r1],&fpregs[r2],
 689                                                 &fpregs[t],status));
 690                                     case 1:
 691                                         return(dbl_frem(&fpregs[r1],&fpregs[r2],
 692                                                 &fpregs[t],status));
 693                                     case 2: /* illegal */
 694                                     case 3: /* quad not implemented */
 695                                         return(MAJOR_0C_EXCP);
 696                                 }
 697                 } /* end of class 3 switch */
 698         } /* end of switch(class) */
 699
 700         /* If we get here, something is really wrong! */
 701         return(MAJOR_0C_EXCP);
 702 }
 703
 704 static u_int
 705 decode_0e(ir,class,subop,fpregs)
 706 u_int ir,class,subop;
 707 u_int fpregs[];
 708 {
 709         u_int r1,r2,t;          /* operand register offsets */
 710         u_int fmt;              /* also sf for class 1 conversions */
 711         u_int df;               /* dest format for class 1 conversions */
 712         u_int *status;
 713         u_int retval, local_status;
 714         u_int fpu_type_flags;
 715
 716         status = &fpregs[0];
 717         local_status = fpregs[0];
 718         r1 = ((extru(ir,fpr1pos,5)<<1)|(extru(ir,fpxr1pos,1)));
 719         if (r1 == 0)
 720                 r1 = fpzeroreg;
 721         t = ((extru(ir,fptpos,5)<<1)|(extru(ir,fpxtpos,1)));
 722         if (t == 0 && class != 2)
 723                 return(MAJOR_0E_EXCP);
 724         if (class < 2)          /* class 0 or 1 has 2 bit fmt */
 725                 fmt = extru(ir,fpfmtpos,2);
 726         else                    /* class 2 and 3 have 1 bit fmt */
 727                 fmt = extru(ir,fp0efmtpos,1);
 728         /*
 729          * An undefined combination, double precision accessing the
 730          * right half of a FPR, can get us into trouble.
 731          * Let's just force proper alignment on it.
 732          */
 733         if (fmt == DBL) {
 734                 r1 &= ~1;
 735                 if (class != 1)
 736                         t &= ~1;
 737         }
 738
 739         switch (class) {
 740             case 0:
 741                 switch (subop) {
 742                         case 0: /* unimplemented */
 743                         case 1:
 744                                 return(MAJOR_0E_EXCP);
 745                         case 2: /* FCPY */
 746                                 switch (fmt) {
 747                                     case 2:
 748                                     case 3:
 749                                         return(MAJOR_0E_EXCP);
 750                                     case 1: /* double */
 751                                         fpregs[t+1] = fpregs[r1+1];
 752                                     case 0: /* single */
 753                                         fpregs[t] = fpregs[r1];
 754                                         return(NOEXCEPTION);
 755                                 }
 756                         case 3: /* FABS */
 757                                 switch (fmt) {
 758                                     case 2:
 759                                     case 3:
 760                                         return(MAJOR_0E_EXCP);
 761                                     case 1: /* double */
 762                                         fpregs[t+1] = fpregs[r1+1];
 763                                     case 0: /* single */
 764                                         fpregs[t] = fpregs[r1] & 0x7fffffff;
 765                                         return(NOEXCEPTION);
 766                                 }
 767                         case 6: /* FNEG */
 768                                 switch (fmt) {
 769                                     case 2:
 770                                     case 3:
 771                                         return(MAJOR_0E_EXCP);
 772                                     case 1: /* double */
 773                                         fpregs[t+1] = fpregs[r1+1];
 774                                     case 0: /* single */
 775                                         fpregs[t] = fpregs[r1] ^ 0x80000000;
 776                                         return(NOEXCEPTION);
 777                                 }
 778                         case 7: /* FNEGABS */
 779                                 switch (fmt) {
 780                                     case 2:
 781                                     case 3:
 782                                         return(MAJOR_0E_EXCP);
 783                                     case 1: /* double */
 784                                         fpregs[t+1] = fpregs[r1+1];
 785                                     case 0: /* single */
 786                                         fpregs[t] = fpregs[r1] | 0x80000000;
 787                                         return(NOEXCEPTION);
 788                                 }
 789                         case 4: /* FSQRT */
 790                                 switch (fmt) {
 791                                     case 0:
 792                                         return(sgl_fsqrt(&fpregs[r1],0,
 793                                                 &fpregs[t], status));
 794                                     case 1:
 795                                         return(dbl_fsqrt(&fpregs[r1],0,
 796                                                 &fpregs[t], status));
 797                                     case 2:
 798                                     case 3:
 799                                         return(MAJOR_0E_EXCP);
 800                                 }
 801                         case 5: /* FRMD */
 802                                 switch (fmt) {
 803                                     case 0:
 804                                         return(sgl_frnd(&fpregs[r1],0,
 805                                                 &fpregs[t], status));
 806                                     case 1:
 807                                         return(dbl_frnd(&fpregs[r1],0,
 808                                                 &fpregs[t], status));
 809                                     case 2:
 810                                     case 3:
 811                                         return(MAJOR_0E_EXCP);
 812                                 }
 813                 } /* end of switch (subop */
 814
 815         case 1: /* class 1 */
 816                 df = extru(ir,fpdfpos,2); /* get dest format */
 817                 /*
 818                  * Fix Crashme problem (writing to 31R in double precision)
 819                  * here too.
 820                  */
 821                 if (df == DBL) {
 822                         t &= ~1;
 823                 }
 824                 if ((df & 2) || (fmt & 2))
 825                         return(MAJOR_0E_EXCP);
 826
 827                 fmt = (fmt << 1) | df;
 828                 switch (subop) {
 829                         case 0: /* FCNVFF */
 830                                 switch(fmt) {
 831                                     case 0: /* sgl/sgl */
 832                                         return(MAJOR_0E_EXCP);
 833                                     case 1: /* sgl/dbl */
 834                                         return(sgl_to_dbl_fcnvff(&fpregs[r1],0,
 835                                                 &fpregs[t],status));
 836                                     case 2: /* dbl/sgl */
 837                                         return(dbl_to_sgl_fcnvff(&fpregs[r1],0,
 838                                                 &fpregs[t],status));
 839                                     case 3: /* dbl/dbl */
 840                                         return(MAJOR_0E_EXCP);
 841                                 }
 842                         case 1: /* FCNVXF */
 843                                 switch(fmt) {
 844                                     case 0: /* sgl/sgl */
 845                                         return(sgl_to_sgl_fcnvxf(&fpregs[r1],0,
 846                                                 &fpregs[t],status));
 847                                     case 1: /* sgl/dbl */
 848                                         return(sgl_to_dbl_fcnvxf(&fpregs[r1],0,
 849                                                 &fpregs[t],status));
 850                                     case 2: /* dbl/sgl */
 851                                         return(dbl_to_sgl_fcnvxf(&fpregs[r1],0,
 852                                                 &fpregs[t],status));
 853                                     case 3: /* dbl/dbl */
 854                                         return(dbl_to_dbl_fcnvxf(&fpregs[r1],0,
 855                                                 &fpregs[t],status));
 856                                 }
 857                         case 2: /* FCNVFX */
 858                                 switch(fmt) {
 859                                     case 0: /* sgl/sgl */
 860                                         return(sgl_to_sgl_fcnvfx(&fpregs[r1],0,
 861                                                 &fpregs[t],status));
 862                                     case 1: /* sgl/dbl */
 863                                         return(sgl_to_dbl_fcnvfx(&fpregs[r1],0,
 864                                                 &fpregs[t],status));
 865                                     case 2: /* dbl/sgl */
 866                                         return(dbl_to_sgl_fcnvfx(&fpregs[r1],0,
 867                                                 &fpregs[t],status));
 868                                     case 3: /* dbl/dbl */
 869                                         return(dbl_to_dbl_fcnvfx(&fpregs[r1],0,
 870                                                 &fpregs[t],status));
 871                                 }
 872                         case 3: /* FCNVFXT */
 873                                 switch(fmt) {
 874                                     case 0: /* sgl/sgl */
 875                                         return(sgl_to_sgl_fcnvfxt(&fpregs[r1],0,
 876                                                 &fpregs[t],status));
 877                                     case 1: /* sgl/dbl */
 878                                         return(sgl_to_dbl_fcnvfxt(&fpregs[r1],0,
 879                                                 &fpregs[t],status));
 880                                     case 2: /* dbl/sgl */
 881                                         return(dbl_to_sgl_fcnvfxt(&fpregs[r1],0,
 882                                                 &fpregs[t],status));
 883                                     case 3: /* dbl/dbl */
 884                                         return(dbl_to_dbl_fcnvfxt(&fpregs[r1],0,
 885                                                 &fpregs[t],status));
 886                                 }
 887                         case 5: /* FCNVUF (PA2.0 only) */
 888                                 switch(fmt) {
 889                                     case 0: /* sgl/sgl */
 890                                         return(sgl_to_sgl_fcnvuf(&fpregs[r1],0,
 891                                                 &fpregs[t],status));
 892                                     case 1: /* sgl/dbl */
 893                                         return(sgl_to_dbl_fcnvuf(&fpregs[r1],0,
 894                                                 &fpregs[t],status));
 895                                     case 2: /* dbl/sgl */
 896                                         return(dbl_to_sgl_fcnvuf(&fpregs[r1],0,
 897                                                 &fpregs[t],status));
 898                                     case 3: /* dbl/dbl */
 899                                         return(dbl_to_dbl_fcnvuf(&fpregs[r1],0,
 900                                                 &fpregs[t],status));
 901                                 }
 902                         case 6: /* FCNVFU (PA2.0 only) */
 903                                 switch(fmt) {
 904                                     case 0: /* sgl/sgl */
 905                                         return(sgl_to_sgl_fcnvfu(&fpregs[r1],0,
 906                                                 &fpregs[t],status));
 907                                     case 1: /* sgl/dbl */
 908                                         return(sgl_to_dbl_fcnvfu(&fpregs[r1],0,
 909                                                 &fpregs[t],status));
 910                                     case 2: /* dbl/sgl */
 911                                         return(dbl_to_sgl_fcnvfu(&fpregs[r1],0,
 912                                                 &fpregs[t],status));
 913                                     case 3: /* dbl/dbl */
 914                                         return(dbl_to_dbl_fcnvfu(&fpregs[r1],0,
 915                                                 &fpregs[t],status));
 916                                 }
 917                         case 7: /* FCNVFUT (PA2.0 only) */
 918                                 switch(fmt) {
 919                                     case 0: /* sgl/sgl */
 920                                         return(sgl_to_sgl_fcnvfut(&fpregs[r1],0,
 921                                                 &fpregs[t],status));
 922                                     case 1: /* sgl/dbl */
 923                                         return(sgl_to_dbl_fcnvfut(&fpregs[r1],0,
 924                                                 &fpregs[t],status));
 925                                     case 2: /* dbl/sgl */
 926                                         return(dbl_to_sgl_fcnvfut(&fpregs[r1],0,
 927                                                 &fpregs[t],status));
 928                                     case 3: /* dbl/dbl */
 929                                         return(dbl_to_dbl_fcnvfut(&fpregs[r1],0,
 930                                                 &fpregs[t],status));
 931                                 }
 932                         case 4: /* undefined */
 933                                 return(MAJOR_0C_EXCP);
 934                 } /* end of switch subop */
 935         case 2: /* class 2 */
 936                 /*
 937                  * Be careful out there.
 938                  * Crashme can generate cases where FR31R is specified
 939                  * as the source or target of a double precision operation.
 940                  * Since we just pass the address of the floating-point
 941                  * register to the emulation routines, this can cause
 942                  * corruption of fpzeroreg.
 943                  */
 944                 if (fmt == DBL)
 945                         r2 = (extru(ir,fpr2pos,5)<<1);
 946                 else
 947                         r2 = ((extru(ir,fpr2pos,5)<<1)|(extru(ir,fpxr2pos,1)));
 948                 fpu_type_flags=fpregs[FPU_TYPE_FLAG_POS];
 949                 if (r2 == 0)
 950                         r2 = fpzeroreg;
 951                 if  (fpu_type_flags & PA2_0_FPU_FLAG) {
 952                         /* FTEST if nullify bit set, otherwise FCMP */
 953                         if (extru(ir, fpnulpos, 1)) {  /* FTEST */
 954                                 /* not legal */
 955                                 return(MAJOR_0E_EXCP);
 956                         } else {  /* FCMP */
 957                         switch (fmt) {
 958                                     /*
 959                                      * fmt is only 1 bit long
 960                                      */
 961                                     case 0:
 962                                         retval = sgl_fcmp(&fpregs[r1],
 963                                                 &fpregs[r2],extru(ir,fptpos,5),
 964                                                 &local_status);
 965                                         update_status_cbit(status,local_status,
 966                                                 fpu_type_flags, subop);
 967                                         return(retval);
 968                                     case 1:
 969                                         retval = dbl_fcmp(&fpregs[r1],
 970                                                 &fpregs[r2],extru(ir,fptpos,5),
 971                                                 &local_status);
 972                                         update_status_cbit(status,local_status,
 973                                                 fpu_type_flags, subop);
 974                                         return(retval);
 975                                 }
 976                         }
 977                 }  /* end of if for PA2.0 */
 978                 else {  /* PA1.0 & PA1.1 */
 979                     switch (subop) {
 980                         case 1:
 981                         case 2:
 982                         case 3:
 983                         case 4:
 984                         case 5:
 985                         case 6:
 986                         case 7:
 987                                 return(MAJOR_0E_EXCP);
 988                         case 0: /* FCMP */
 989                                 switch (fmt) {
 990                                     /*
 991                                      * fmt is only 1 bit long
 992                                      */
 993                                     case 0:
 994                                         retval = sgl_fcmp(&fpregs[r1],
 995                                                 &fpregs[r2],extru(ir,fptpos,5),
 996                                                 &local_status);
 997                                         update_status_cbit(status,local_status,
 998                                                 fpu_type_flags, subop);
 999                                         return(retval);
1000                                     case 1:
1001                                         retval = dbl_fcmp(&fpregs[r1],
1002                                                 &fpregs[r2],extru(ir,fptpos,5),
1003                                                 &local_status);
1004                                         update_status_cbit(status,local_status,
1005                                                 fpu_type_flags, subop);
1006                                         return(retval);
1007                                 }
1008                     } /* end of switch subop */
1009                 } /* end of else for PA1.0 & PA1.1 */
1010         case 3: /* class 3 */
1011                 /*
1012                  * Be careful out there.
1013                  * Crashme can generate cases where FR31R is specified
1014                  * as the source or target of a double precision operation.
1015                  * Since we just pass the address of the floating-point
1016                  * register to the emulation routines, this can cause
1017                  * corruption of fpzeroreg.
1018                  */
1019                 if (fmt == DBL)
1020                         r2 = (extru(ir,fpr2pos,5)<<1);
1021                 else
1022                         r2 = ((extru(ir,fpr2pos,5)<<1)|(extru(ir,fpxr2pos,1)));
1023                 if (r2 == 0)
1024                         r2 = fpzeroreg;
1025                 switch (subop) {
1026                         case 5:
1027                         case 6:
1028                         case 7:
1029                                 return(MAJOR_0E_EXCP);
1030
1031                         /*
1032                          * Note that fmt is only 1 bit for class 3 */
1033                         case 0: /* FADD */
1034                                 switch (fmt) {
1035                                     case 0:
1036                                         return(sgl_fadd(&fpregs[r1],&fpregs[r2],
1037                                                 &fpregs[t],status));
1038                                     case 1:
1039                                         return(dbl_fadd(&fpregs[r1],&fpregs[r2],
1040                                                 &fpregs[t],status));
1041                                 }
1042                         case 1: /* FSUB */
1043                                 switch (fmt) {
1044                                     case 0:
1045                                         return(sgl_fsub(&fpregs[r1],&fpregs[r2],
1046                                                 &fpregs[t],status));
1047                                     case 1:
1048                                         return(dbl_fsub(&fpregs[r1],&fpregs[r2],
1049                                                 &fpregs[t],status));
1050                                 }
1051                         case 2: /* FMPY or XMPYU */
1052                                 /*
1053                                  * check for integer multiply (x bit set)
1054                                  */
1055                                 if (extru(ir,fpxpos,1)) {
1056                                     /*
1057                                      * emulate XMPYU
1058                                      */
1059                                     switch (fmt) {
1060                                         case 0:
1061                                             /*
1062                                              * bad instruction if t specifies
1063                                              * the right half of a register
1064                                              */
1065                                             if (t & 1)
1066                                                 return(MAJOR_0E_EXCP);
1067                                             BUG();
1068                                             /* unsupported
1069                                              * impyu(&fpregs[r1],&fpregs[r2],
1070                                                  * &fpregs[t]);
1071                                              */
1072                                             return(NOEXCEPTION);
1073                                         case 1:
1074                                                 return(MAJOR_0E_EXCP);
1075                                     }
1076                                 }
1077                                 else { /* FMPY */
1078                                     switch (fmt) {
1079                                         case 0:
1080                                             return(sgl_fmpy(&fpregs[r1],
1081                                                &fpregs[r2],&fpregs[t],status));
1082                                         case 1:
1083                                             return(dbl_fmpy(&fpregs[r1],
1084                                                &fpregs[r2],&fpregs[t],status));
1085                                     }
1086                                 }
1087                         case 3: /* FDIV */
1088                                 switch (fmt) {
1089                                     case 0:
1090                                         return(sgl_fdiv(&fpregs[r1],&fpregs[r2],
1091                                                 &fpregs[t],status));
1092                                     case 1:
1093                                         return(dbl_fdiv(&fpregs[r1],&fpregs[r2],
1094                                                 &fpregs[t],status));
1095                                 }
1096                         case 4: /* FREM */
1097                                 switch (fmt) {
1098                                     case 0:
1099                                         return(sgl_frem(&fpregs[r1],&fpregs[r2],
1100                                                 &fpregs[t],status));
1101                                     case 1:
1102                                         return(dbl_frem(&fpregs[r1],&fpregs[r2],
1103                                                 &fpregs[t],status));
1104                                 }
1105                 } /* end of class 3 switch */
1106         } /* end of switch(class) */
1107
1108         /* If we get here, something is really wrong! */
1109         return(MAJOR_0E_EXCP);
1110 }
1111
1112
1113 /*
1114  * routine to decode the 06 (FMPYADD and FMPYCFXT) instruction
1115  */
1116 static u_int
1117 decode_06(ir,fpregs)
1118 u_int ir;
1119 u_int fpregs[];
1120 {
1121         u_int rm1, rm2, tm, ra, ta; /* operands */
1122         u_int fmt;
1123         u_int error = 0;
1124         u_int status;
1125         u_int fpu_type_flags;
1126         union {
1127                 double dbl;
1128                 float flt;
1129                 struct { u_int i1; u_int i2; } ints;
1130         } mtmp, atmp;
1131
1132
1133         status = fpregs[0];             /* use a local copy of status reg */
1134         fpu_type_flags=fpregs[FPU_TYPE_FLAG_POS];  /* get fpu type flags */
1135         fmt = extru(ir, fpmultifmt, 1); /* get sgl/dbl flag */
1136         if (fmt == 0) { /* DBL */
1137                 rm1 = extru(ir, fprm1pos, 5) * sizeof(double)/sizeof(u_int);
1138                 if (rm1 == 0)
1139                         rm1 = fpzeroreg;
1140                 rm2 = extru(ir, fprm2pos, 5) * sizeof(double)/sizeof(u_int);
1141                 if (rm2 == 0)
1142                         rm2 = fpzeroreg;
1143                 tm = extru(ir, fptmpos, 5) * sizeof(double)/sizeof(u_int);
1144                 if (tm == 0)
1145                         return(MAJOR_06_EXCP);
1146                 ra = extru(ir, fprapos, 5) * sizeof(double)/sizeof(u_int);
1147                 ta = extru(ir, fptapos, 5) * sizeof(double)/sizeof(u_int);
1148                 if (ta == 0)
1149                         return(MAJOR_06_EXCP);
1150
1151                 if  (fpu_type_flags & TIMEX_ROLEX_FPU_MASK)  {
1152
1153                         if (ra == 0) {
1154                                 /* special case FMPYCFXT, see sgl case below */
1155                                 if (dbl_fmpy(&fpregs[rm1],&fpregs[rm2],
1156                                         &mtmp.ints.i1,&status))
1157                                         error = 1;
1158                                 if (dbl_to_sgl_fcnvfxt(&fpregs[ta],
1159                                         &atmp.ints.i1,&atmp.ints.i1,&status))
1160                                         error = 1;
1161                                 }
1162                         else {
1163
1164                         if (dbl_fmpy(&fpregs[rm1],&fpregs[rm2],&mtmp.ints.i1,
1165                                         &status))
1166                                 error = 1;
1167                         if (dbl_fadd(&fpregs[ta], &fpregs[ra], &atmp.ints.i1,
1168                                         &status))
1169                                 error = 1;
1170                                 }
1171                         }
1172
1173                 else
1174
1175                         {
1176                         if (ra == 0)
1177                                 ra = fpzeroreg;
1178
1179                         if (dbl_fmpy(&fpregs[rm1],&fpregs[rm2],&mtmp.ints.i1,
1180                                         &status))
1181                                 error = 1;
1182                         if (dbl_fadd(&fpregs[ta], &fpregs[ra], &atmp.ints.i1,
1183                                         &status))
1184                                 error = 1;
1185
1186                         }
1187
1188                 if (error)
1189                         return(MAJOR_06_EXCP);
1190                 else {
1191                         /* copy results */
1192                         fpregs[tm] = mtmp.ints.i1;
1193                         fpregs[tm+1] = mtmp.ints.i2;
1194                         fpregs[ta] = atmp.ints.i1;
1195                         fpregs[ta+1] = atmp.ints.i2;
1196                         fpregs[0] = status;
1197                         return(NOEXCEPTION);
1198                 }
1199         }
1200         else { /* SGL */
1201                 /*
1202                  * calculate offsets for single precision numbers
1203                  * See table 6-14 in PA-89 architecture for mapping
1204                  */
1205                 rm1 = (extru(ir,fprm1pos,4) | 0x10 ) << 1;      /* get offset */
1206                 rm1 |= extru(ir,fprm1pos-4,1);  /* add right word offset */
1207
1208                 rm2 = (extru(ir,fprm2pos,4) | 0x10 ) << 1;      /* get offset */
1209                 rm2 |= extru(ir,fprm2pos-4,1);  /* add right word offset */
1210
1211                 tm = (extru(ir,fptmpos,4) | 0x10 ) << 1;        /* get offset */
1212                 tm |= extru(ir,fptmpos-4,1);    /* add right word offset */
1213
1214                 ra = (extru(ir,fprapos,4) | 0x10 ) << 1;        /* get offset */
1215                 ra |= extru(ir,fprapos-4,1);    /* add right word offset */
1216
1217                 ta = (extru(ir,fptapos,4) | 0x10 ) << 1;        /* get offset */
1218                 ta |= extru(ir,fptapos-4,1);    /* add right word offset */
1219
1220                 if (ra == 0x20 &&(fpu_type_flags & TIMEX_ROLEX_FPU_MASK)) {
1221                         /* special case FMPYCFXT (really 0)
1222                           * This instruction is only present on the Timex and
1223                           * Rolex fpu's in so if it is the special case and
1224                           * one of these fpu's we run the FMPYCFXT instruction
1225                           */
1226                         if (sgl_fmpy(&fpregs[rm1],&fpregs[rm2],&mtmp.ints.i1,
1227                                         &status))
1228                                 error = 1;
1229                         if (sgl_to_sgl_fcnvfxt(&fpregs[ta],&atmp.ints.i1,
1230                                 &atmp.ints.i1,&status))
1231                                 error = 1;
1232                 }
1233                 else {
1234                         if (sgl_fmpy(&fpregs[rm1],&fpregs[rm2],&mtmp.ints.i1,
1235                                         &status))
1236                                 error = 1;
1237                         if (sgl_fadd(&fpregs[ta], &fpregs[ra], &atmp.ints.i1,
1238                                         &status))
1239                                 error = 1;
1240                 }
1241                 if (error)
1242                         return(MAJOR_06_EXCP);
1243                 else {
1244                         /* copy results */
1245                         fpregs[tm] = mtmp.ints.i1;
1246                         fpregs[ta] = atmp.ints.i1;
1247                         fpregs[0] = status;
1248                         return(NOEXCEPTION);
1249                 }
1250         }
1251 }
1252
1253 /*
1254  * routine to decode the 26 (FMPYSUB) instruction
1255  */
1256 static u_int
1257 decode_26(ir,fpregs)
1258 u_int ir;
1259 u_int fpregs[];
1260 {
1261         u_int rm1, rm2, tm, ra, ta; /* operands */
1262         u_int fmt;
1263         u_int error = 0;
1264         u_int status;
1265         union {
1266                 double dbl;
1267                 float flt;
1268                 struct { u_int i1; u_int i2; } ints;
1269         } mtmp, atmp;
1270
1271
1272         status = fpregs[0];
1273         fmt = extru(ir, fpmultifmt, 1); /* get sgl/dbl flag */
1274         if (fmt == 0) { /* DBL */
1275                 rm1 = extru(ir, fprm1pos, 5) * sizeof(double)/sizeof(u_int);
1276                 if (rm1 == 0)
1277                         rm1 = fpzeroreg;
1278                 rm2 = extru(ir, fprm2pos, 5) * sizeof(double)/sizeof(u_int);
1279                 if (rm2 == 0)
1280                         rm2 = fpzeroreg;
1281                 tm = extru(ir, fptmpos, 5) * sizeof(double)/sizeof(u_int);
1282                 if (tm == 0)
1283                         return(MAJOR_26_EXCP);
1284                 ra = extru(ir, fprapos, 5) * sizeof(double)/sizeof(u_int);
1285                 if (ra == 0)
1286                         return(MAJOR_26_EXCP);
1287                 ta = extru(ir, fptapos, 5) * sizeof(double)/sizeof(u_int);
1288                 if (ta == 0)
1289                         return(MAJOR_26_EXCP);
1290
1291                 if (dbl_fmpy(&fpregs[rm1],&fpregs[rm2],&mtmp.ints.i1,&status))
1292                         error = 1;
1293                 if (dbl_fsub(&fpregs[ta], &fpregs[ra], &atmp.ints.i1,&status))
1294                         error = 1;
1295                 if (error)
1296                         return(MAJOR_26_EXCP);
1297                 else {
1298                         /* copy results */
1299                         fpregs[tm] = mtmp.ints.i1;
1300                         fpregs[tm+1] = mtmp.ints.i2;
1301                         fpregs[ta] = atmp.ints.i1;
1302                         fpregs[ta+1] = atmp.ints.i2;
1303                         fpregs[0] = status;
1304                         return(NOEXCEPTION);
1305                 }
1306         }
1307         else { /* SGL */
1308                 /*
1309                  * calculate offsets for single precision numbers
1310                  * See table 6-14 in PA-89 architecture for mapping
1311                  */
1312                 rm1 = (extru(ir,fprm1pos,4) | 0x10 ) << 1;      /* get offset */
1313                 rm1 |= extru(ir,fprm1pos-4,1);  /* add right word offset */
1314
1315                 rm2 = (extru(ir,fprm2pos,4) | 0x10 ) << 1;      /* get offset */
1316                 rm2 |= extru(ir,fprm2pos-4,1);  /* add right word offset */
1317
1318                 tm = (extru(ir,fptmpos,4) | 0x10 ) << 1;        /* get offset */
1319                 tm |= extru(ir,fptmpos-4,1);    /* add right word offset */
1320
1321                 ra = (extru(ir,fprapos,4) | 0x10 ) << 1;        /* get offset */
1322                 ra |= extru(ir,fprapos-4,1);    /* add right word offset */
1323
1324                 ta = (extru(ir,fptapos,4) | 0x10 ) << 1;        /* get offset */
1325                 ta |= extru(ir,fptapos-4,1);    /* add right word offset */
1326
1327                 if (sgl_fmpy(&fpregs[rm1],&fpregs[rm2],&mtmp.ints.i1,&status))
1328                         error = 1;
1329                 if (sgl_fsub(&fpregs[ta], &fpregs[ra], &atmp.ints.i1,&status))
1330                         error = 1;
1331                 if (error)
1332                         return(MAJOR_26_EXCP);
1333                 else {
1334                         /* copy results */
1335                         fpregs[tm] = mtmp.ints.i1;
1336                         fpregs[ta] = atmp.ints.i1;
1337                         fpregs[0] = status;
1338                         return(NOEXCEPTION);
1339                 }
1340         }
1341
1342 }
1343
1344 /*
1345  * routine to decode the 2E (FMPYFADD,FMPYNFADD) instructions
1346  */
1347 static u_int
1348 decode_2e(ir,fpregs)
1349 u_int ir;
1350 u_int fpregs[];
1351 {
1352         u_int rm1, rm2, ra, t; /* operands */
1353         u_int fmt;
1354
1355         fmt = extru(ir,fpfmtpos,1);     /* get fmt completer */
1356         if (fmt == DBL) { /* DBL */
1357                 rm1 = extru(ir,fprm1pos,5) * sizeof(double)/sizeof(u_int);
1358                 if (rm1 == 0)
1359                         rm1 = fpzeroreg;
1360                 rm2 = extru(ir,fprm2pos,5) * sizeof(double)/sizeof(u_int);
1361                 if (rm2 == 0)
1362                         rm2 = fpzeroreg;
1363                 ra = ((extru(ir,fpraupos,3)<<2)|(extru(ir,fpralpos,3)>>1)) *
1364                      sizeof(double)/sizeof(u_int);
1365                 if (ra == 0)
1366                         ra = fpzeroreg;
1367                 t = extru(ir,fptpos,5) * sizeof(double)/sizeof(u_int);
1368                 if (t == 0)
1369                         return(MAJOR_2E_EXCP);
1370
1371                 if (extru(ir,fpfusedsubop,1)) { /* fmpyfadd or fmpynfadd? */
1372                         return(dbl_fmpynfadd(&fpregs[rm1], &fpregs[rm2],
1373                                         &fpregs[ra], &fpregs[0], &fpregs[t]));
1374                 } else {
1375                         return(dbl_fmpyfadd(&fpregs[rm1], &fpregs[rm2],
1376                                         &fpregs[ra], &fpregs[0], &fpregs[t]));
1377                 }
1378         } /* end DBL */
1379         else { /* SGL */
1380                 rm1 = (extru(ir,fprm1pos,5)<<1)|(extru(ir,fpxrm1pos,1));
1381                 if (rm1 == 0)
1382                         rm1 = fpzeroreg;
1383                 rm2 = (extru(ir,fprm2pos,5)<<1)|(extru(ir,fpxrm2pos,1));
1384                 if (rm2 == 0)
1385                         rm2 = fpzeroreg;
1386                 ra = (extru(ir,fpraupos,3)<<3)|extru(ir,fpralpos,3);
1387                 if (ra == 0)
1388                         ra = fpzeroreg;
1389                 t = ((extru(ir,fptpos,5)<<1)|(extru(ir,fpxtpos,1)));
1390                 if (t == 0)
1391                         return(MAJOR_2E_EXCP);
1392
1393                 if (extru(ir,fpfusedsubop,1)) { /* fmpyfadd or fmpynfadd? */
1394                         return(sgl_fmpynfadd(&fpregs[rm1], &fpregs[rm2],
1395                                         &fpregs[ra], &fpregs[0], &fpregs[t]));
1396                 } else {
1397                         return(sgl_fmpyfadd(&fpregs[rm1], &fpregs[rm2],
1398                                         &fpregs[ra], &fpregs[0], &fpregs[t]));
1399                 }
1400         } /* end SGL */
1401 }
1402
1403 /*
1404  * update_status_cbit
1405  *
1406  *      This routine returns the correct FP status register value in
1407  *      *status, based on the C-bit & V-bit returned by the FCMP
1408  *      emulation routine in new_status.  The architecture type
1409  *      (PA83, PA89 or PA2.0) is available in fpu_type.  The y_field
1410  *      and the architecture type are used to determine what flavor
1411  *      of FCMP is being emulated.
1412  */
1413 static void
1414 update_status_cbit(status, new_status, fpu_type, y_field)
1415 u_int *status, new_status;
1416 u_int fpu_type;
1417 u_int y_field;
1418 {
1419         /*
1420          * For PA89 FPU's which implement the Compare Queue and
1421          * for PA2.0 FPU's, update the Compare Queue if the y-field = 0,
1422          * otherwise update the specified bit in the Compare Array.
1423          * Note that the y-field will always be 0 for non-PA2.0 FPU's.
1424          */
1425         if ((fpu_type & TIMEX_EXTEN_FLAG) ||
1426             (fpu_type & ROLEX_EXTEN_FLAG) ||
1427             (fpu_type & PA2_0_FPU_FLAG)) {
1428                 if (y_field == 0) {
1429                         *status = ((*status & 0x04000000) >> 5) | /* old Cbit */
1430                                   ((*status & 0x003ff000) >> 1) | /* old CQ   */
1431                                   (new_status & 0xffc007ff); /* all other bits*/
1432                 } else {
1433                         *status = (*status & 0x04000000) |     /* old Cbit */
1434                                   ((new_status & 0x04000000) >> (y_field+4)) |
1435                                   (new_status & ~0x04000000 &  /* other bits */
1436                                    ~(0x04000000 >> (y_field+4)));
1437                 }
1438         }
1439         /* if PA83, just update the C-bit */
1440         else {
1441                 *status = new_status;
1442         }
1443 }