opcodes/hppa-dis.c

   1 /* Disassembler for the PA-RISC. Somewhat derived from sparc-pinsn.c.
   2    Copyright 1989, 1990, 1992, 1993 Free Software Foundation, Inc.
   3
   4    Contributed by the Center for Software Science at the
   5    University of Utah (pa-gdb-bugs@cs.utah.edu).
   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 of the License, or
  10 (at your option) 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 #include <ansidecl.h>
  22 #include "sysdep.h"
  23 #include "dis-asm.h"
  24 #include "libhppa.h"
  25 #include "opcode/hppa.h"
  26
  27 /* Integer register names, indexed by the numbers which appear in the
  28    opcodes.  */
  29 static const char *const reg_names[] =
  30  {"flags", "r1", "rp", "r3", "r4", "r5", "r6", "r7", "r8", "r9",
  31   "r10", "r11", "r12", "r13", "r14", "r15", "r16", "r17", "r18", "r19",
  32   "r20", "r21", "r22", "r23", "r24", "r25", "r26", "dp", "ret0", "ret1",
  33   "sp", "r31"};
  34
  35 /* Floating point register names, indexed by the numbers which appear in the
  36    opcodes.  */
  37 static const char *const fp_reg_names[] =
  38  {"fpsr", "fpe2", "fpe4", "fpe6",
  39   "fr4", "fr5", "fr6", "fr7", "fr8",
  40   "fr9", "fr10", "fr11", "fr12", "fr13", "fr14", "fr15",
  41   "fr16", "fr17", "fr18", "fr19", "fr20", "fr21", "fr22", "fr23",
  42   "fr24", "fr25", "fr26", "fr27", "fr28", "fr29", "fr30", "fr31"};
  43
  44 typedef unsigned int CORE_ADDR;
  45
  46 /* Get at various relevent fields of an instruction word. */
  47
  48 #define MASK_5 0x1f
  49 #define MASK_11 0x7ff
  50 #define MASK_14 0x3fff
  51 #define MASK_21 0x1fffff
  52
  53 /* This macro gets bit fields using HP's numbering (MSB = 0) */
  54
  55 #define GET_FIELD(X, FROM, TO) \
  56   ((X) >> (31 - (TO)) & ((1 << ((TO) - (FROM) + 1)) - 1))
  57
  58 /* Some of these have been converted to 2-d arrays because they
  59    consume less storage this way.  If the maintenance becomes a
  60    problem, convert them back to const 1-d pointer arrays.  */
  61 static const char control_reg[][6] = {
  62   "rctr", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7",
  63   "pidr1", "pidr2", "ccr", "sar", "pidr3", "pidr4",
  64   "iva", "eiem", "itmr", "pcsq", "pcoq", "iir", "isr",
  65   "ior", "ipsw", "eirr", "tr0", "tr1", "tr2", "tr3",
  66   "tr4", "tr5", "tr6", "tr7"
  67 };
  68
  69 static const char compare_cond_names[][5] = {
  70   "", ",=", ",<", ",<=", ",<<", ",<<=", ",sv",
  71   ",od", ",tr", ",<>", ",>=", ",>", ",>>=",
  72   ",>>", ",nsv", ",ev"
  73 };
  74 static const char add_cond_names[][5] = {
  75   "", ",=", ",<", ",<=", ",nuv", ",znv", ",sv",
  76   ",od", ",tr", ",<>", ",>=", ",>", ",uv",
  77   ",vnz", ",nsv", ",ev"
  78 };
  79 static const char *const logical_cond_names[] = {
  80   "", ",=", ",<", ",<=", 0, 0, 0, ",od",
  81   ",tr", ",<>", ",>=", ",>", 0, 0, 0, ",ev"};
  82 static const char *const unit_cond_names[] = {
  83   "", 0, ",sbz", ",shz", ",sdc", 0, ",sbc", ",shc",
  84   ",tr", 0, ",nbz", ",nhz", ",ndc", 0, ",nbc", ",nhc"
  85 };
  86 static const char shift_cond_names[][4] = {
  87   "", ",=", ",<", ",od", ",tr", ",<>", ",>=", ",ev"
  88 };
  89 static const char index_compl_names[][4] = {"", ",m", ",s", ",sm"};
  90 static const char short_ldst_compl_names[][4] = {"", ",ma", "", ",mb"};
  91 static const char *const short_bytes_compl_names[] = {
  92   "", ",b,m", ",e", ",e,m"
  93 };
  94 static const char *const float_format_names[] = {",sgl", ",dbl", "", ",quad"};
  95 static const char float_comp_names[][8] =
  96 {
  97   ",false?", ",false", ",?", ",!<=>", ",=", ",=t", ",?=", ",!<>",
  98   ",!?>=", ",<", ",?<", ",!>=", ",!?>", ",<=", ",?<=", ",!>",
  99   ",!?<=", ",>", ",?>", ",!<=", ",!?<", ",>=", ",?>=", ",!<",
 100   ",!?=", ",<>", ",!=", ",!=t", ",!?", ",<=>", ",true?", ",true"
 101 };
 102
 103 /* For a bunch of different instructions form an index into a
 104    completer name table. */
 105 #define GET_COMPL(insn) (GET_FIELD (insn, 26, 26) | \
 106                          GET_FIELD (insn, 18, 18) << 1)
 107
 108 #define GET_COND(insn) (GET_FIELD ((insn), 16, 18) + \
 109                         (GET_FIELD ((insn), 19, 19) ? 8 : 0))
 110
 111 /* Utility function to print registers.  Put these first, so gcc's function
 112    inlining can do its stuff.  */
 113
 114 #define fputs_filtered(STR,F)   (*info->fprintf_func) (info->stream, "%s", STR)
 115
 116 static void
 117 fput_reg (reg, info)
 118      unsigned reg;
 119      disassemble_info *info;
 120 {
 121   (*info->fprintf_func) (info->stream, reg ? reg_names[reg] : "r0");
 122 }
 123
 124 static void
 125 fput_fp_reg (reg, info)
 126      unsigned reg;
 127      disassemble_info *info;
 128 {
 129   (*info->fprintf_func) (info->stream, reg ? fp_reg_names[reg] : "fr0");
 130 }
 131
 132 static void
 133 fput_fp_reg_r (reg, info)
 134      unsigned reg;
 135      disassemble_info *info;
 136 {
 137   /* Special case floating point exception registers.  */
 138   if (reg < 4)
 139     (*info->fprintf_func) (info->stream, "fpe%d", reg * 2 + 1);
 140   else
 141     (*info->fprintf_func) (info->stream, "%sR", reg ? fp_reg_names[reg]
 142                                                     : "fr0");
 143 }
 144
 145 static void
 146 fput_creg (reg, info)
 147      unsigned reg;
 148      disassemble_info *info;
 149 {
 150   (*info->fprintf_func) (info->stream, control_reg[reg]);
 151 }
 152
 153 /* print constants with sign */
 154
 155 static void
 156 fput_const (num, info)
 157      unsigned num;
 158      disassemble_info *info;
 159 {
 160   if ((int)num < 0)
 161     (*info->fprintf_func) (info->stream, "-%x", -(int)num);
 162   else
 163     (*info->fprintf_func) (info->stream, "%x", num);
 164 }
 165
 166 /* Routines to extract various sized constants out of hppa
 167    instructions. */
 168
 169 /* extract a 3-bit space register number from a be, ble, mtsp or mfsp */
 170 static int
 171 extract_3 (word)
 172      unsigned word;
 173 {
 174   return GET_FIELD (word, 18, 18) << 2 | GET_FIELD (word, 16, 17);
 175 }
 176
 177 static int
 178 extract_5_load (word)
 179      unsigned word;
 180 {
 181   return low_sign_extend (word >> 16 & MASK_5, 5);
 182 }
 183
 184 /* extract the immediate field from a st{bhw}s instruction */
 185 static int
 186 extract_5_store (word)
 187      unsigned word;
 188 {
 189   return low_sign_extend (word & MASK_5, 5);
 190 }
 191
 192 /* extract the immediate field from a break instruction */
 193 static unsigned
 194 extract_5r_store (word)
 195      unsigned word;
 196 {
 197   return (word & MASK_5);
 198 }
 199
 200 /* extract the immediate field from a {sr}sm instruction */
 201 static unsigned
 202 extract_5R_store (word)
 203      unsigned word;
 204 {
 205   return (word >> 16 & MASK_5);
 206 }
 207
 208 /* extract the immediate field from a bb instruction */
 209 static unsigned
 210 extract_5Q_store (word)
 211      unsigned word;
 212 {
 213   return (word >> 21 & MASK_5);
 214 }
 215
 216 /* extract an 11 bit immediate field */
 217 static int
 218 extract_11 (word)
 219      unsigned word;
 220 {
 221   return low_sign_extend (word & MASK_11, 11);
 222 }
 223
 224 /* extract a 14 bit immediate field */
 225 static int
 226 extract_14 (word)
 227      unsigned word;
 228 {
 229   return low_sign_extend (word & MASK_14, 14);
 230 }
 231
 232 /* extract a 21 bit constant */
 233
 234 static int
 235 extract_21 (word)
 236      unsigned word;
 237 {
 238   int val;
 239
 240   word &= MASK_21;
 241   word <<= 11;
 242   val = GET_FIELD (word, 20, 20);
 243   val <<= 11;
 244   val |= GET_FIELD (word, 9, 19);
 245   val <<= 2;
 246   val |= GET_FIELD (word, 5, 6);
 247   val <<= 5;
 248   val |= GET_FIELD (word, 0, 4);
 249   val <<= 2;
 250   val |= GET_FIELD (word, 7, 8);
 251   return sign_extend (val, 21) << 11;
 252 }
 253
 254 /* extract a 12 bit constant from branch instructions */
 255
 256 static int
 257 extract_12 (word)
 258      unsigned word;
 259 {
 260   return sign_extend (GET_FIELD (word, 19, 28) |
 261                       GET_FIELD (word, 29, 29) << 10 |
 262                       (word & 0x1) << 11, 12) << 2;
 263 }
 264
 265 /* extract a 17 bit constant from branch instructions, returning the
 266    19 bit signed value. */
 267
 268 static int
 269 extract_17 (word)
 270      unsigned word;
 271 {
 272   return sign_extend (GET_FIELD (word, 19, 28) |
 273                       GET_FIELD (word, 29, 29) << 10 |
 274                       GET_FIELD (word, 11, 15) << 11 |
 275                       (word & 0x1) << 16, 17) << 2;
 276 }
 277
 278 /* Print one instruction.  */
 279 int
 280 print_insn_hppa (memaddr, info)
 281      bfd_vma memaddr;
 282      disassemble_info *info;
 283 {
 284   bfd_byte buffer[4];
 285   unsigned int insn, i;
 286
 287   {
 288     int status =
 289       (*info->read_memory_func) (memaddr, buffer, sizeof (buffer), info);
 290     if (status != 0)
 291       {
 292         (*info->memory_error_func) (status, memaddr, info);
 293         return -1;
 294       }
 295   }
 296
 297   insn = bfd_getb32 (buffer);
 298
 299   for (i = 0; i < NUMOPCODES; ++i)
 300     {
 301       const struct pa_opcode *opcode = &pa_opcodes[i];
 302       if ((insn & opcode->mask) == opcode->match)
 303         {
 304           register const char *s;
 305
 306           (*info->fprintf_func) (info->stream, "%s", opcode->name);
 307
 308           if (!strchr ("cfCY<?!@-+&U>~nHNZFIMadu|", opcode->args[0]))
 309             (*info->fprintf_func) (info->stream, " ");
 310           for (s = opcode->args; *s != '\0'; ++s)
 311             {
 312               switch (*s)
 313                 {
 314                 case 'x':
 315                   fput_reg (GET_FIELD (insn, 11, 15), info);
 316                   break;
 317                 case 'X':
 318                   if (GET_FIELD (insn, 25, 25))
 319                       fput_fp_reg_r (GET_FIELD (insn, 11, 15), info);
 320                   else
 321                       fput_fp_reg (GET_FIELD (insn, 11, 15), info);
 322                   break;
 323                 case 'b':
 324                   fput_reg (GET_FIELD (insn, 6, 10), info);
 325                   break;
 326                 case '^':
 327                   fput_creg (GET_FIELD (insn, 6, 10), info);
 328                   break;
 329                 case 'E':
 330                   if (GET_FIELD (insn, 25, 25))
 331                       fput_fp_reg_r (GET_FIELD (insn, 6, 10), info);
 332                   else
 333                       fput_fp_reg (GET_FIELD (insn, 6, 10), info);
 334                   break;
 335                 case 't':
 336                   fput_reg (GET_FIELD (insn, 27, 31), info);
 337                   break;
 338                 case 'v':
 339                   if (GET_FIELD (insn, 25, 25))
 340                       fput_fp_reg_r (GET_FIELD (insn, 27, 31), info);
 341                   else
 342                       fput_fp_reg (GET_FIELD (insn, 27, 31), info);
 343                   break;
 344                 case 'y':
 345                   fput_fp_reg (GET_FIELD (insn, 27, 31), info);
 346                   break;
 347                 case '4':
 348                   {
 349                     int reg = GET_FIELD (insn, 6, 10);
 350
 351                     reg |= (GET_FIELD (insn, 26, 26) << 4);
 352                     fput_fp_reg (reg, info);
 353                     break;
 354                   }
 355                 case '6':
 356                   {
 357                     int reg = GET_FIELD (insn, 11, 15);
 358
 359                     reg |= (GET_FIELD (insn, 26, 26) << 4);
 360                     fput_fp_reg (reg, info);
 361                     break;
 362                   }
 363                 case '7':
 364                   {
 365                     int reg = GET_FIELD (insn, 27, 31);
 366
 367                     reg |= (GET_FIELD (insn, 26, 26) << 4);
 368                     fput_fp_reg (reg, info);
 369                     break;
 370                   }
 371                 case '8':
 372                   {
 373                     int reg = GET_FIELD (insn, 16, 20);
 374
 375                     reg |= (GET_FIELD (insn, 26, 26) << 4);
 376                     fput_fp_reg (reg, info);
 377                     break;
 378                   }
 379                 case '9':
 380                   {
 381                     int reg = GET_FIELD (insn, 21, 25);
 382
 383                     reg |= (GET_FIELD (insn, 26, 26) << 4);
 384                     fput_fp_reg (reg, info);
 385                     break;
 386                   }
 387                 case '5':
 388                   fput_const (extract_5_load (insn), info);
 389                   break;
 390                 case 's':
 391                   (*info->fprintf_func) (info->stream,
 392                                          "sr%d", GET_FIELD (insn, 16, 17));
 393                   break;
 394                 case 'S':
 395                   (*info->fprintf_func) (info->stream, "sr%d", extract_3 (insn));
 396                   break;
 397                 case 'c':
 398                   (*info->fprintf_func) (info->stream, "%s ",
 399                                     index_compl_names[GET_COMPL (insn)]);
 400                   break;
 401                 case 'C':
 402                   (*info->fprintf_func) (info->stream, "%s ",
 403                                     short_ldst_compl_names[GET_COMPL (insn)]);
 404                   break;
 405                 case 'Y':
 406                   (*info->fprintf_func) (info->stream, "%s ",
 407                                     short_bytes_compl_names[GET_COMPL (insn)]);
 408                   break;
 409                 /* these four conditions are for the set of instructions
 410                    which distinguish true/false conditions by opcode rather
 411                    than by the 'f' bit (sigh): comb, comib, addb, addib */
 412                 case '<':
 413                   fputs_filtered (compare_cond_names[GET_FIELD (insn, 16, 18)],
 414                                   info);
 415                   break;
 416                 case '?':
 417                   fputs_filtered (compare_cond_names[GET_FIELD (insn, 16, 18)
 418                                   + GET_FIELD (insn, 4, 4) * 8], info);
 419                   break;
 420                 case '@':
 421                   fputs_filtered (add_cond_names[GET_FIELD (insn, 16, 18)
 422                                   + GET_FIELD (insn, 4, 4) * 8], info);
 423                   break;
 424                 case 'a':
 425                   (*info->fprintf_func) (info->stream, "%s ",
 426                                          compare_cond_names[GET_COND (insn)]);
 427                   break;
 428                 case 'd':
 429                   (*info->fprintf_func) (info->stream, "%s ",
 430                                          add_cond_names[GET_COND (insn)]);
 431                   break;
 432                 case '!':
 433                   (*info->fprintf_func) (info->stream, "%s",
 434                                     add_cond_names[GET_FIELD (insn, 16, 18)]);
 435                   break;
 436
 437                 case '&':
 438                   (*info->fprintf_func) (info->stream, "%s ",
 439                                     logical_cond_names[GET_COND (insn)]);
 440                   break;
 441                 case 'U':
 442                   (*info->fprintf_func) (info->stream, "%s ",
 443                                     unit_cond_names[GET_COND (insn)]);
 444                   break;
 445                 case '|':
 446                 case '>':
 447                 case '~':
 448                   (*info->fprintf_func)
 449                     (info->stream, "%s",
 450                      shift_cond_names[GET_FIELD (insn, 16, 18)]);
 451
 452                   /* If the next character in args is 'n', it will handle
 453                      putting out the space.  */
 454                   if (s[1] != 'n')
 455                     (*info->fprintf_func) (info->stream, " ");
 456                   break;
 457                 case 'V':
 458                   fput_const (extract_5_store (insn), info);
 459                   break;
 460                 case 'r':
 461                   fput_const (extract_5r_store (insn), info);
 462                   break;
 463                 case 'R':
 464                   fput_const (extract_5R_store (insn), info);
 465                   break;
 466                 case 'Q':
 467                   fput_const (extract_5Q_store (insn), info);
 468                   break;
 469                 case 'i':
 470                   fput_const (extract_11 (insn), info);
 471                   break;
 472                 case 'j':
 473                   fput_const (extract_14 (insn), info);
 474                   break;
 475                 case 'k':
 476                   fput_const (extract_21 (insn), info);
 477                   break;
 478                 case 'n':
 479                   if (insn & 0x2)
 480                     (*info->fprintf_func) (info->stream, ",n ");
 481                   else
 482                     (*info->fprintf_func) (info->stream, " ");
 483                   break;
 484                 case 'N':
 485                   if ((insn & 0x20) && s[1])
 486                     (*info->fprintf_func) (info->stream, ",n ");
 487                   else if (insn & 0x20)
 488                     (*info->fprintf_func) (info->stream, ",n");
 489                   else if (s[1])
 490                     (*info->fprintf_func) (info->stream, " ");
 491                   break;
 492                 case 'w':
 493                   (*info->print_address_func) (memaddr + 8 + extract_12 (insn),
 494                                                info);
 495                   break;
 496                 case 'W':
 497                   /* 17 bit PC-relative branch.  */
 498                   (*info->print_address_func) ((memaddr + 8
 499                                                 + extract_17 (insn)),
 500                                                info);
 501                   break;
 502                 case 'z':
 503                   /* 17 bit displacement.  This is an offset from a register
 504                      so it gets disasssembled as just a number, not any sort
 505                      of address.  */
 506                   fput_const (extract_17 (insn), info);
 507                   break;
 508                 case 'p':
 509                   (*info->fprintf_func) (info->stream, "%d",
 510                                     31 - GET_FIELD (insn, 22, 26));
 511                   break;
 512                 case 'P':
 513                   (*info->fprintf_func) (info->stream, "%d",
 514                                     GET_FIELD (insn, 22, 26));
 515                   break;
 516                 case 'T':
 517                   (*info->fprintf_func) (info->stream, "%d",
 518                                     32 - GET_FIELD (insn, 27, 31));
 519                   break;
 520                 case 'A':
 521                   fput_const (GET_FIELD (insn, 6, 18), info);
 522                   break;
 523                 case 'Z':
 524                   if (GET_FIELD (insn, 26, 26))
 525                     (*info->fprintf_func) (info->stream, ",m ");
 526                   else
 527                     (*info->fprintf_func) (info->stream, " ");
 528                   break;
 529                 case 'D':
 530                   fput_const (GET_FIELD (insn, 6, 31), info);
 531                   break;
 532                 case 'f':
 533                   (*info->fprintf_func) (info->stream, ",%d", GET_FIELD (insn, 23, 25));
 534                   break;
 535                 case 'O':
 536                   fput_const ((GET_FIELD (insn, 6,20) << 5 |
 537                                GET_FIELD (insn, 27, 31)), info);
 538                   break;
 539                 case 'o':
 540                   fput_const (GET_FIELD (insn, 6, 20), info);
 541                   break;
 542                 case '3':
 543                   {
 544                     int reg = GET_FIELD (insn, 21, 22);
 545                     reg |= GET_FIELD (insn, 16, 18) << 2;
 546                     if (GET_FIELD (insn, 23, 23) != 0)
 547                       fput_fp_reg_r (reg, info);
 548                     else
 549                       fput_fp_reg (reg, info);
 550                     break;
 551                   }
 552
 553                 case '2':
 554                   fput_const ((GET_FIELD (insn, 6, 22) << 5 |
 555                                GET_FIELD (insn, 27, 31)), info);
 556                   break;
 557                 case '1':
 558                   fput_const ((GET_FIELD (insn, 11, 20) << 5 |
 559                                GET_FIELD (insn, 27, 31)), info);
 560                   break;
 561                 case '0':
 562                   fput_const ((GET_FIELD (insn, 16, 20) << 5 |
 563                                GET_FIELD (insn, 27, 31)), info);
 564                   break;
 565                 case 'u':
 566                   (*info->fprintf_func) (info->stream, ",%d", GET_FIELD (insn, 23, 25));
 567                   break;
 568                 case 'F':
 569                   /* if no destination completer and not before a completer
 570                      for fcmp, need a space here */
 571                   if (GET_FIELD (insn, 21, 22) == 1 || s[1] == 'M')
 572                     fputs_filtered (float_format_names[GET_FIELD (insn, 19, 20)],
 573                                     info);
 574                   else
 575                     (*info->fprintf_func) (info->stream, "%s ",
 576                                            float_format_names[GET_FIELD
 577                                                               (insn, 19, 20)]);
 578                   break;
 579                 case 'G':
 580                   (*info->fprintf_func) (info->stream, "%s ",
 581                                     float_format_names[GET_FIELD (insn,
 582                                                                   17, 18)]);
 583                   break;
 584                 case 'H':
 585                   if (GET_FIELD (insn, 26, 26) == 1)
 586                     (*info->fprintf_func) (info->stream, "%s ",
 587                                     float_format_names[0]);
 588                   else
 589                     (*info->fprintf_func) (info->stream, "%s ",
 590                                     float_format_names[1]);
 591                   break;
 592                 case 'I':
 593                   /* if no destination completer and not before a completer
 594                      for fcmp, need a space here */
 595                   if (GET_FIELD (insn, 21, 22) == 1 || s[1] == 'M')
 596                     fputs_filtered (float_format_names[GET_FIELD (insn, 20, 20)],
 597                                     info);
 598                   else
 599                     (*info->fprintf_func) (info->stream, "%s ",
 600                                            float_format_names[GET_FIELD
 601                                                               (insn, 20, 20)]);
 602                   break;
 603                 case 'J':
 604                   if (GET_FIELD (insn, 24, 24))
 605                       fput_fp_reg_r (GET_FIELD (insn, 6, 10), info);
 606                   else
 607                       fput_fp_reg (GET_FIELD (insn, 6, 10), info);
 608
 609                   break;
 610                 case 'K':
 611                   if (GET_FIELD (insn, 19, 19))
 612                       fput_fp_reg_r (GET_FIELD (insn, 11, 15), info);
 613                   else
 614                       fput_fp_reg (GET_FIELD (insn, 11, 15), info);
 615                   break;
 616                 case 'M':
 617                     (*info->fprintf_func) (info->stream, "%s ",
 618                                            float_comp_names[GET_FIELD
 619                                                               (insn, 27, 31)]);
 620                   break;
 621                 default:
 622                   (*info->fprintf_func) (info->stream, "%c", *s);
 623                   break;
 624                 }
 625             }
 626           return sizeof(insn);
 627         }
 628     }
 629   (*info->fprintf_func) (info->stream, "#%8x", insn);
 630   return sizeof(insn);
 631 }