arch/parisc/math-emu/fpudispatch.c

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