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                   fput_fp_reg (GET_FIELD (insn, 6, 10), info);
 331                 case 't':
 332                   fput_reg (GET_FIELD (insn, 27, 31), info);
 333                   break;
 334                 case 'v':
 335                   if (GET_FIELD (insn, 25, 25))
 336                       fput_fp_reg_r (GET_FIELD (insn, 27, 31), info);
 337                   else
 338                       fput_fp_reg (GET_FIELD (insn, 27, 31), info);
 339                   break;
 340                 case 'y':
 341                   fput_fp_reg (GET_FIELD (insn, 27, 31), info);
 342                   break;
 343                 case '4':
 344                   {
 345                     int reg = GET_FIELD (insn, 6, 10);
 346
 347                     reg |= (GET_FIELD (insn, 26, 26) << 4);
 348                     fput_fp_reg (reg, info);
 349                     break;
 350                   }
 351                 case '6':
 352                   {
 353                     int reg = GET_FIELD (insn, 11, 15);
 354
 355                     reg |= (GET_FIELD (insn, 26, 26) << 4);
 356                     fput_fp_reg (reg, info);
 357                     break;
 358                   }
 359                 case '7':
 360                   {
 361                     int reg = GET_FIELD (insn, 27, 31);
 362
 363                     reg |= (GET_FIELD (insn, 26, 26) << 4);
 364                     fput_fp_reg (reg, info);
 365                     break;
 366                   }
 367                 case '8':
 368                   {
 369                     int reg = GET_FIELD (insn, 16, 20);
 370
 371                     reg |= (GET_FIELD (insn, 26, 26) << 4);
 372                     fput_fp_reg (reg, info);
 373                     break;
 374                   }
 375                 case '9':
 376                   {
 377                     int reg = GET_FIELD (insn, 21, 25);
 378
 379                     reg |= (GET_FIELD (insn, 26, 26) << 4);
 380                     fput_fp_reg (reg, info);
 381                     break;
 382                   }
 383                 case '5':
 384                   fput_const (extract_5_load (insn), info);
 385                   break;
 386                 case 's':
 387                   (*info->fprintf_func) (info->stream,
 388                                          "sr%d", GET_FIELD (insn, 16, 17));
 389                   break;
 390                 case 'S':
 391                   (*info->fprintf_func) (info->stream, "sr%d", extract_3 (insn));
 392                   break;
 393                 case 'c':
 394                   (*info->fprintf_func) (info->stream, "%s ",
 395                                     index_compl_names[GET_COMPL (insn)]);
 396                   break;
 397                 case 'C':
 398                   (*info->fprintf_func) (info->stream, "%s ",
 399                                     short_ldst_compl_names[GET_COMPL (insn)]);
 400                   break;
 401                 case 'Y':
 402                   (*info->fprintf_func) (info->stream, "%s ",
 403                                     short_bytes_compl_names[GET_COMPL (insn)]);
 404                   break;
 405                 /* these four conditions are for the set of instructions
 406                    which distinguish true/false conditions by opcode rather
 407                    than by the 'f' bit (sigh): comb, comib, addb, addib */
 408                 case '<':
 409                   fputs_filtered (compare_cond_names[GET_FIELD (insn, 16, 18)],
 410                                   info);
 411                   break;
 412                 case '?':
 413                   fputs_filtered (compare_cond_names[GET_FIELD (insn, 16, 18)
 414                                   + GET_FIELD (insn, 4, 4) * 8], info);
 415                   break;
 416                 case '@':
 417                   fputs_filtered (add_cond_names[GET_FIELD (insn, 16, 18)
 418                                   + GET_FIELD (insn, 4, 4) * 8], info);
 419                   break;
 420                 case 'a':
 421                   (*info->fprintf_func) (info->stream, "%s ",
 422                                          compare_cond_names[GET_COND (insn)]);
 423                   break;
 424                 case 'd':
 425                   (*info->fprintf_func) (info->stream, "%s ",
 426                                          add_cond_names[GET_COND (insn)]);
 427                   break;
 428                 case '!':
 429                   (*info->fprintf_func) (info->stream, "%s",
 430                                     add_cond_names[GET_FIELD (insn, 16, 18)]);
 431                   break;
 432
 433                 case '&':
 434                   (*info->fprintf_func) (info->stream, "%s ",
 435                                     logical_cond_names[GET_COND (insn)]);
 436                   break;
 437                 case 'U':
 438                   (*info->fprintf_func) (info->stream, "%s ",
 439                                     unit_cond_names[GET_COND (insn)]);
 440                   break;
 441                 case '|':
 442                 case '>':
 443                 case '~':
 444                   (*info->fprintf_func)
 445                     (info->stream, "%s",
 446                      shift_cond_names[GET_FIELD (insn, 16, 18)]);
 447
 448                   /* If the next character in args is 'n', it will handle
 449                      putting out the space.  */
 450                   if (s[1] != 'n')
 451                     (*info->fprintf_func) (info->stream, " ");
 452                   break;
 453                 case 'V':
 454                   fput_const (extract_5_store (insn), info);
 455                   break;
 456                 case 'r':
 457                   fput_const (extract_5r_store (insn), info);
 458                   break;
 459                 case 'R':
 460                   fput_const (extract_5R_store (insn), info);
 461                   break;
 462                 case 'Q':
 463                   fput_const (extract_5Q_store (insn), info);
 464                   break;
 465                 case 'i':
 466                   fput_const (extract_11 (insn), info);
 467                   break;
 468                 case 'j':
 469                   fput_const (extract_14 (insn), info);
 470                   break;
 471                 case 'k':
 472                   fput_const (extract_21 (insn), info);
 473                   break;
 474                 case 'n':
 475                   if (insn & 0x2)
 476                     (*info->fprintf_func) (info->stream, ",n ");
 477                   else
 478                     (*info->fprintf_func) (info->stream, " ");
 479                   break;
 480                 case 'N':
 481                   if ((insn & 0x20) && s[1])
 482                     (*info->fprintf_func) (info->stream, ",n ");
 483                   else if (insn & 0x20)
 484                     (*info->fprintf_func) (info->stream, ",n");
 485                   else if (s[1])
 486                     (*info->fprintf_func) (info->stream, " ");
 487                   break;
 488                 case 'w':
 489                   (*info->print_address_func) (memaddr + 8 + extract_12 (insn),
 490                                                info);
 491                   break;
 492                 case 'W':
 493                   /* 17 bit PC-relative branch.  */
 494                   (*info->print_address_func) ((memaddr + 8
 495                                                 + extract_17 (insn)),
 496                                                info);
 497                   break;
 498                 case 'z':
 499                   /* 17 bit displacement.  This is an offset from a register
 500                      so it gets disasssembled as just a number, not any sort
 501                      of address.  */
 502                   fput_const (extract_17 (insn), info);
 503                   break;
 504                 case 'p':
 505                   (*info->fprintf_func) (info->stream, "%d",
 506                                     31 - GET_FIELD (insn, 22, 26));
 507                   break;
 508                 case 'P':
 509                   (*info->fprintf_func) (info->stream, "%d",
 510                                     GET_FIELD (insn, 22, 26));
 511                   break;
 512                 case 'T':
 513                   (*info->fprintf_func) (info->stream, "%d",
 514                                     32 - GET_FIELD (insn, 27, 31));
 515                   break;
 516                 case 'A':
 517                   fput_const (GET_FIELD (insn, 6, 18), info);
 518                   break;
 519                 case 'Z':
 520                   if (GET_FIELD (insn, 26, 26))
 521                     (*info->fprintf_func) (info->stream, ",m ");
 522                   else
 523                     (*info->fprintf_func) (info->stream, " ");
 524                   break;
 525                 case 'D':
 526                   fput_const (GET_FIELD (insn, 6, 31), info);
 527                   break;
 528                 case 'f':
 529                   (*info->fprintf_func) (info->stream, ",%d", GET_FIELD (insn, 23, 25));
 530                   break;
 531                 case 'O':
 532                   fput_const ((GET_FIELD (insn, 6,20) << 5 |
 533                                GET_FIELD (insn, 27, 31)), info);
 534                   break;
 535                 case 'o':
 536                   fput_const (GET_FIELD (insn, 6, 20), info);
 537                   break;
 538                 case '3':
 539                   {
 540                     int reg = GET_FIELD (insn, 21, 22);
 541                     reg |= GET_FIELD (insn, 16, 18) << 2;
 542                     if (GET_FIELD (insn, 23, 23) != 0)
 543                       fput_fp_reg_r (reg, info);
 544                     else
 545                       fput_fp_reg (reg, info);
 546                     break;
 547                   }
 548
 549                 case '2':
 550                   fput_const ((GET_FIELD (insn, 6, 22) << 5 |
 551                                GET_FIELD (insn, 27, 31)), info);
 552                   break;
 553                 case '1':
 554                   fput_const ((GET_FIELD (insn, 11, 20) << 5 |
 555                                GET_FIELD (insn, 27, 31)), info);
 556                   break;
 557                 case '0':
 558                   fput_const ((GET_FIELD (insn, 16, 20) << 5 |
 559                                GET_FIELD (insn, 27, 31)), info);
 560                   break;
 561                 case 'u':
 562                   (*info->fprintf_func) (info->stream, ",%d", GET_FIELD (insn, 23, 25));
 563                   break;
 564                 case 'F':
 565                   /* if no destination completer and not before a completer
 566                      for fcmp, need a space here */
 567                   if (GET_FIELD (insn, 21, 22) == 1 || s[1] == 'M')
 568                     fputs_filtered (float_format_names[GET_FIELD (insn, 19, 20)],
 569                                     info);
 570                   else
 571                     (*info->fprintf_func) (info->stream, "%s ",
 572                                            float_format_names[GET_FIELD
 573                                                               (insn, 19, 20)]);
 574                   break;
 575                 case 'G':
 576                   (*info->fprintf_func) (info->stream, "%s ",
 577                                     float_format_names[GET_FIELD (insn,
 578                                                                   17, 18)]);
 579                   break;
 580                 case 'H':
 581                   if (GET_FIELD (insn, 26, 26) == 1)
 582                     (*info->fprintf_func) (info->stream, "%s ",
 583                                     float_format_names[0]);
 584                   else
 585                     (*info->fprintf_func) (info->stream, "%s ",
 586                                     float_format_names[1]);
 587                   break;
 588                 case 'I':
 589                   /* if no destination completer and not before a completer
 590                      for fcmp, need a space here */
 591                   if (GET_FIELD (insn, 21, 22) == 1 || s[1] == 'M')
 592                     fputs_filtered (float_format_names[GET_FIELD (insn, 20, 20)],
 593                                     info);
 594                   else
 595                     (*info->fprintf_func) (info->stream, "%s ",
 596                                            float_format_names[GET_FIELD
 597                                                               (insn, 20, 20)]);
 598                   break;
 599                 case 'J':
 600                   if (GET_FIELD (insn, 24, 24))
 601                       fput_fp_reg_r (GET_FIELD (insn, 6, 10), info);
 602                   else
 603                       fput_fp_reg (GET_FIELD (insn, 6, 10), info);
 604
 605                   break;
 606                 case 'K':
 607                   if (GET_FIELD (insn, 19, 19))
 608                       fput_fp_reg_r (GET_FIELD (insn, 11, 15), info);
 609                   else
 610                       fput_fp_reg (GET_FIELD (insn, 11, 15), info);
 611                   break;
 612                 case 'M':
 613                     (*info->fprintf_func) (info->stream, "%s ",
 614                                            float_comp_names[GET_FIELD
 615                                                               (insn, 27, 31)]);
 616                   break;
 617                 default:
 618                   (*info->fprintf_func) (info->stream, "%c", *s);
 619                   break;
 620                 }
 621             }
 622           return sizeof(insn);
 623         }
 624     }
 625   (*info->fprintf_func) (info->stream, "#%8x", insn);
 626   return sizeof(insn);
 627 }