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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21 #include "dis-asm.h"
  22 #include "sysdep.h"
  23 #include "opcode/hppa.h"
  24
  25 /* Initializer for an array of names of registers.
  26    There should be NUM_REGS strings in this initializer.  */
  27
  28 #define REGISTER_NAMES  \
  29  {"flags", "r1", "rp", "r3", "r4", "r5", "r6", "r7", "r8", "r9",        \
  30   "r10", "r11", "r12", "r13", "r14", "r15", "r16", "r17", "r18", "r19", \
  31   "r20", "r21", "r22", "arg3", "arg2", "arg1", "arg0", "dp", "ret0", "ret1", \
  32   "sp", "r31", "sar", "pcoqh", "pcsqh", "pcoqt", "pcsqt", \
  33   "eiem", "iir", "isr", "ior", "ipsw", "goto", "sr4", "sr0", "sr1", "sr2", \
  34   "sr3", "sr5", "sr6", "sr7", "cr0", "cr8", "cr9", "ccr", "cr12", "cr13", \
  35   "cr24", "cr25", "cr26", "mpsfu_high", "mpsfu_low", "mpsfu_ovflo", "pad", \
  36   "fpsr", "fpe1", "fpe2", "fpe3", "fpe4", "fpe5", "fpe6", "fpe7", \
  37   "fp4", "fp5", "fp6", "fp7", "fp8", \
  38   "fp9", "fp10", "fp11", "fp12", "fp13", "fp14", "fp15", \
  39   "fp16", "fp17", "fp18", "fp19", "fp20", "fp21", "fp22", "fp23", \
  40   "fp24", "fp25", "fp26", "fp27", "fp28", "fp29", "fp30", "fp31"}
  41
  42 static const char *const reg_names[] = REGISTER_NAMES;
  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_reg_r (reg, info)
 126      unsigned reg;
 127      disassemble_info *info;
 128 {
 129   (*info->fprintf_func) (info->stream, "%sR", reg ? reg_names[reg] : "r0");
 130 }
 131
 132 static void
 133 fput_creg (reg, info)
 134      unsigned reg;
 135      disassemble_info *info;
 136 {
 137   (*info->fprintf_func) (info->stream, control_reg[reg]);
 138 }
 139
 140 /* print constants with sign */
 141
 142 static void
 143 fput_const (num, info)
 144      unsigned num;
 145      disassemble_info *info;
 146 {
 147   if ((int)num < 0)
 148     (*info->fprintf_func) (info->stream, "-%x", -(int)num);
 149   else
 150     (*info->fprintf_func) (info->stream, "%x", num);
 151 }
 152
 153 /* Routines to extract various sized constants out of hppa
 154    instructions. */
 155
 156 /* This assumes that no garbage lies outside of the lower bits of
 157    value. */
 158
 159 static int
 160 sign_extend (val, bits)
 161      unsigned val, bits;
 162 {
 163   return (int)(val >> (bits - 1) ? (-1 << bits) | val : val);
 164 }
 165
 166 /* For many immediate values the sign bit is the low bit! */
 167
 168 static int
 169 low_sign_extend (val, bits)
 170      unsigned val, bits;
 171 {
 172   return (int)((val & 0x1 ? (-1 << (bits - 1)) : 0) | val >> 1);
 173 }
 174 /* extract the immediate field from a ld{bhw}s instruction */
 175
 176 #if 0 /* not used */
 177 static unsigned
 178 get_field (val, from, to)
 179      unsigned val, from, to;
 180 {
 181   val = val >> (31 - to);
 182   return val & ((1 << (32 - from)) - 1);
 183 }
 184
 185 static unsigned
 186 set_field (val, from, to, new_val)
 187      unsigned *val, from, to, new_val;
 188 {
 189   unsigned mask = ~((1 << (to - from + 1)) << (31 - from));
 190   return *val = (*val & mask) | (new_val << (31 - from));
 191 }
 192 #endif
 193
 194 /* extract a 3-bit space register number from a be, ble, mtsp or mfsp */
 195 static int
 196 extract_3 (word)
 197      unsigned word;
 198 {
 199   return GET_FIELD (word, 18, 18) << 2 | GET_FIELD (word, 16, 17);
 200 }
 201
 202 static int
 203 extract_5_load (word)
 204      unsigned word;
 205 {
 206   return low_sign_extend (word >> 16 & MASK_5, 5);
 207 }
 208
 209 /* extract the immediate field from a st{bhw}s instruction */
 210 static int
 211 extract_5_store (word)
 212      unsigned word;
 213 {
 214   return low_sign_extend (word & MASK_5, 5);
 215 }
 216
 217 /* extract the immediate field from a break instruction */
 218 static unsigned
 219 extract_5r_store (word)
 220      unsigned word;
 221 {
 222   return (word & MASK_5);
 223 }
 224
 225 /* extract the immediate field from a {sr}sm instruction */
 226 static unsigned
 227 extract_5R_store (word)
 228      unsigned word;
 229 {
 230   return (word >> 16 & MASK_5);
 231 }
 232
 233 /* extract the immediate field from a bb instruction */
 234 static unsigned
 235 extract_5Q_store (word)
 236      unsigned word;
 237 {
 238   return (word >> 21 & MASK_5);
 239 }
 240
 241 /* extract an 11 bit immediate field */
 242 static int
 243 extract_11 (word)
 244      unsigned word;
 245 {
 246   return low_sign_extend (word & MASK_11, 11);
 247 }
 248
 249 /* extract a 14 bit immediate field */
 250 static int
 251 extract_14 (word)
 252      unsigned word;
 253 {
 254   return low_sign_extend (word & MASK_14, 14);
 255 }
 256
 257 #if 0
 258 /* deposit a 14 bit constant in a word */
 259 static unsigned
 260 deposit_14 (opnd, word)
 261      int opnd;
 262      unsigned word;
 263 {
 264   unsigned sign = (opnd < 0 ? 1 : 0);
 265
 266   return word | ((unsigned)opnd << 1 & MASK_14)  | sign;
 267 }
 268 #endif
 269
 270 /* extract a 21 bit constant */
 271
 272 static int
 273 extract_21 (word)
 274      unsigned word;
 275 {
 276   int val;
 277
 278   word &= MASK_21;
 279   word <<= 11;
 280   val = GET_FIELD (word, 20, 20);
 281   val <<= 11;
 282   val |= GET_FIELD (word, 9, 19);
 283   val <<= 2;
 284   val |= GET_FIELD (word, 5, 6);
 285   val <<= 5;
 286   val |= GET_FIELD (word, 0, 4);
 287   val <<= 2;
 288   val |= GET_FIELD (word, 7, 8);
 289   return sign_extend (val, 21) << 11;
 290 }
 291
 292 #if 0
 293 /* deposit a 21 bit constant in a word. Although 21 bit constants are
 294    usually the top 21 bits of a 32 bit constant, we assume that only
 295    the low 21 bits of opnd are relevant */
 296
 297 static unsigned
 298 deposit_21 (opnd, word)
 299      unsigned opnd, word;
 300 {
 301   unsigned val = 0;
 302
 303   val |= GET_FIELD (opnd, 11 + 14, 11 + 18);
 304   val <<= 2;
 305   val |= GET_FIELD (opnd, 11 + 12, 11 + 13);
 306   val <<= 2;
 307   val |= GET_FIELD (opnd, 11 + 19, 11 + 20);
 308   val <<= 11;
 309   val |= GET_FIELD (opnd, 11 + 1, 11 + 11);
 310   val <<= 1;
 311   val |= GET_FIELD (opnd, 11 + 0, 11 + 0);
 312   return word | val;
 313 }
 314 #endif
 315
 316 /* extract a 12 bit constant from branch instructions */
 317
 318 static int
 319 extract_12 (word)
 320      unsigned word;
 321 {
 322   return sign_extend (GET_FIELD (word, 19, 28) |
 323                       GET_FIELD (word, 29, 29) << 10 |
 324                       (word & 0x1) << 11, 12) << 2;
 325 }
 326
 327 /* extract a 17 bit constant from branch instructions, returning the
 328    19 bit signed value. */
 329
 330 static int
 331 extract_17 (word)
 332      unsigned word;
 333 {
 334   return sign_extend (GET_FIELD (word, 19, 28) |
 335                       GET_FIELD (word, 29, 29) << 10 |
 336                       GET_FIELD (word, 11, 15) << 11 |
 337                       (word & 0x1) << 16, 17) << 2;
 338 }
 339
 340 /* Print one instruction.  */
 341 int
 342 print_insn_hppa (memaddr, info)
 343      bfd_vma memaddr;
 344      disassemble_info *info;
 345 {
 346   unsigned int insn, i, op;
 347   FILE *stream = info->stream;
 348
 349   {
 350     int status =
 351       (*info->read_memory_func) (memaddr, (bfd_byte*) &insn, sizeof (insn),
 352                                  info);
 353     if (status != 0)
 354       {
 355         (*info->memory_error_func) (status, memaddr, info);
 356         return -1;
 357       }
 358   }
 359
 360   for (i = 0; i < NUMOPCODES; ++i)
 361     {
 362       const struct pa_opcode *opcode = &pa_opcodes[i];
 363       if ((insn & opcode->mask) == opcode->match)
 364         {
 365           register const char *s;
 366
 367           (*info->fprintf_func) (info->stream, "%s", opcode->name);
 368
 369           if (!strchr ("cCY<?!@-+&U>~nZFIMad", opcode->args[0]))
 370             (*info->fprintf_func) (info->stream, " ");
 371           for (s = opcode->args; *s != '\0'; ++s)
 372             {
 373               switch (*s)
 374                 {
 375                 case 'x':
 376                   fput_reg (GET_FIELD (insn, 11, 15), info);
 377                   break;
 378                 case 'X':
 379                   if (GET_FIELD (insn, 25, 25))
 380                       fput_reg_r (GET_FIELD (insn, 11, 15), info);
 381                   else
 382                       fput_reg (GET_FIELD (insn, 11, 15), info);
 383                   break;
 384                 case 'b':
 385                   fput_reg (GET_FIELD (insn, 6, 10), info);
 386                   break;
 387                 case '^':
 388                   fput_creg (GET_FIELD (insn, 6, 10), info);
 389                   break;
 390                 case 'E':
 391                   if (GET_FIELD (insn, 25, 25))
 392                       fput_reg_r (GET_FIELD (insn, 6, 10), info);
 393                   else
 394                       fput_reg (GET_FIELD (insn, 6, 10), info);
 395                   break;
 396                 case 't':
 397                   fput_reg (GET_FIELD (insn, 27, 31), info);
 398                   break;
 399                 case 'v':
 400                   if (GET_FIELD (insn, 25, 25))
 401                       fput_reg_r (GET_FIELD (insn, 27, 31), info);
 402                   else
 403                       fput_reg (GET_FIELD (insn, 27, 31), info);
 404                   break;
 405                 case '4':
 406                   fput_creg (GET_FIELD (insn, 6, 10), info);
 407                   break;
 408                 case '6':
 409                   fput_reg (GET_FIELD (insn, 11, 15), info);
 410                   break;
 411                 case '7':
 412                   fput_reg (GET_FIELD (insn, 27, 31), info);
 413                   break;
 414                 case '8':
 415                   fput_reg (GET_FIELD (insn, 16, 20), info);
 416                   break;
 417                 case '9':
 418                   fput_reg (GET_FIELD (insn, 21, 25), info);
 419                   break;
 420                 case '5':
 421                   fput_const (extract_5_load (insn), info);
 422                   break;
 423                 case 's':
 424                   fprintf_filtered (stream, "sr%d", GET_FIELD (insn, 16, 17));
 425                   break;
 426                 case 'S':
 427                   (*info->fprintf_func) (info->stream, "sr%d", extract_3 (insn));
 428                   break;
 429                 case 'c':
 430                   (*info->fprintf_func) (info->stream, "%s ",
 431                                     index_compl_names[GET_COMPL (insn)]);
 432                   break;
 433                 case 'C':
 434                   (*info->fprintf_func) (info->stream, "%s ",
 435                                     short_ldst_compl_names[GET_COMPL (insn)]);
 436                   break;
 437                 case 'Y':
 438                   (*info->fprintf_func) (info->stream, "%s ",
 439                                     short_bytes_compl_names[GET_COMPL (insn)]);
 440                   break;
 441                 /* these four conditions are for the set of instructions
 442                    which distinguish true/false conditions by opcode rather
 443                    than by the 'f' bit (sigh): comb, comib, addb, addib */
 444                 case '<':
 445                   fputs_filtered (compare_cond_names[GET_FIELD (insn, 16, 18)],
 446                                   info);
 447                   break;
 448                 case '?':
 449                   fputs_filtered (compare_cond_names[GET_FIELD (insn, 16, 18) + 8],
 450                                   info);
 451                   break;
 452                 case '@':
 453                   fputs_filtered (add_cond_names[GET_FIELD (insn, 16, 18) + 8],
 454                                   info);
 455                   break;
 456                 case 'a':
 457                   (*info->fprintf_func) (info->stream, "%s",
 458                                     compare_cond_names[GET_COND (insn)]);
 459                   break;
 460                 case 'd':
 461                 case '!':
 462                   (*info->fprintf_func) (info->stream, "%s",
 463                                     add_cond_names[GET_FIELD (insn, 16, 18)]);
 464                   break;
 465
 466                 case '&':
 467                   (*info->fprintf_func) (info->stream, "%s ",
 468                                     logical_cond_names[GET_COND (insn)]);
 469                   break;
 470                 case 'U':
 471                   (*info->fprintf_func) (info->stream, "%s ",
 472                                     unit_cond_names[GET_COND (insn)]);
 473                   break;
 474                 case '>':
 475                 case '~':
 476                   (*info->fprintf_func) (info->stream, "%s ",
 477                                     shift_cond_names[GET_FIELD (insn, 16, 18)]);
 478                   break;
 479                 case 'V':
 480                   fput_const (extract_5_store (insn), info);
 481                   break;
 482                 case 'R':
 483                   fput_const (extract_5R_store (insn), info);
 484                   break;
 485                 case 'Q':
 486                   fput_const (extract_5Q_store (insn), info);
 487                   break;
 488                 case 'i':
 489                   fput_const (extract_11 (insn), info);
 490                   break;
 491                 case 'j':
 492                   fput_const (extract_14 (insn), info);
 493                   break;
 494                 case 'k':
 495                   fput_const (extract_21 (insn), info);
 496                   break;
 497                 case 'n':
 498                   if (insn & 0x2)
 499                     (*info->fprintf_func) (info->stream, ",n ");
 500                   else
 501                     (*info->fprintf_func) (info->stream, " ");
 502                   break;
 503                 case 'w':
 504                   (*info->print_address_func) (memaddr + 8 + extract_12 (insn),
 505                                                info);
 506                   break;
 507                 case 'W':
 508                   /* don't interpret an address if it's an external branch
 509                      instruction. */
 510                   op = GET_FIELD (insn, 0, 5);
 511                   if (op != 0x38 /* be */ && op != 0x39 /* ble */)
 512                     (*info->print_address_func) ((memaddr + 8
 513                                                   + extract_17 (insn)),
 514                                                  info);
 515                   else
 516                     fput_const (extract_17 (insn), info);
 517                   break;
 518                 case 'p':
 519                   (*info->fprintf_func) (info->stream, "%d",
 520                                     31 - GET_FIELD (insn, 22, 26));
 521                   break;
 522                 case 'P':
 523                   (*info->fprintf_func) (info->stream, "%d",
 524                                     GET_FIELD (insn, 22, 26));
 525                   break;
 526                 case 'T':
 527                   (*info->fprintf_func) (info->stream, "%d",
 528                                     32 - GET_FIELD (insn, 27, 31));
 529                   break;
 530                 case 'A':
 531                   fput_const (GET_FIELD (insn, 6, 18), info);
 532                   break;
 533                 case 'Z':
 534                   if (GET_FIELD (insn, 26, 26))
 535                     (*info->fprintf_func) (info->stream, ",m ");
 536                   else
 537                     (*info->fprintf_func) (info->stream, " ");
 538                   break;
 539                 case 'D':
 540                   fput_const (GET_FIELD (insn, 6, 31), info);
 541                   break;
 542                 case 'f':
 543                   (*info->fprintf_func) (info->stream, ",%d", GET_FIELD (insn, 23, 25));
 544                   break;
 545                 case 'O':
 546                   fput_const ((GET_FIELD (insn, 6,20) << 5 |
 547                                GET_FIELD (insn, 27, 31)), info);
 548                   break;
 549                 case 'o':
 550                   fput_const (GET_FIELD (insn, 6, 20), info);
 551                   break;
 552                 case '2':
 553                   fput_const ((GET_FIELD (insn, 6, 22) << 5 |
 554                                GET_FIELD (insn, 27, 31)), info);
 555                   break;
 556                 case '1':
 557                   fput_const ((GET_FIELD (insn, 11, 20) << 5 |
 558                                GET_FIELD (insn, 27, 31)), info);
 559                   break;
 560                 case '0':
 561                   fput_const ((GET_FIELD (insn, 16, 20) << 5 |
 562                                GET_FIELD (insn, 27, 31)), info);
 563                   break;
 564                 case 'u':
 565                   (*info->fprintf_func) (info->stream, "%d", GET_FIELD (insn, 23, 25));
 566                   break;
 567                 case 'F':
 568                   /* if no destination completer, need a space here */
 569                   if (GET_FIELD (insn, 21, 22) == 1)
 570                     fputs_filtered (float_format_names[GET_FIELD (insn, 19, 20)],
 571                                     info);
 572                   else
 573                     (*info->fprintf_func) (info->stream, "%s ",
 574                                       float_format_names[GET_FIELD
 575                                                          (insn, 19, 20)]);
 576                   break;
 577                 case 'G':
 578                   (*info->fprintf_func) (info->stream, "%s ",
 579                                     float_format_names[GET_FIELD (insn,
 580                                                                   17, 18)]);
 581                   break;
 582                 case 'H':
 583                     fputs_filtered (float_format_names[GET_FIELD
 584                                                       (insn, 26, 26)], info);
 585                   break;
 586                 case 'I':
 587                   /* if no destination completer, need a space here */
 588                   if (GET_FIELD (insn, 21, 22) == 1)
 589                     fputs_filtered (float_format_names[GET_FIELD (insn, 20, 20)],
 590                                     info);
 591                   else
 592                     fprintf_filtered (stream, "%s ",
 593                                       float_format_names[GET_FIELD
 594                                                          (insn, 20, 20)]);
 595                   break;
 596                 case 'J':
 597                   if (GET_FIELD (insn, 24, 24))
 598                       fput_reg_r (GET_FIELD (insn, 6, 10), info);
 599                   else
 600                       fput_reg (GET_FIELD (insn, 6, 10), info);
 601
 602                   break;
 603                 case 'K':
 604                   if (GET_FIELD (insn, 19, 19))
 605                       fput_reg_r (GET_FIELD (insn, 11, 15), info);
 606                   else
 607                       fput_reg (GET_FIELD (insn, 11, 15), info);
 608                   break;
 609                 case 'M':
 610                   fputs_filtered (float_comp_names[GET_FIELD (insn, 27, 31)],
 611                                   info);
 612                   break;
 613                 default:
 614                   (*info->fprintf_func) (info->stream, "%c", *s);
 615                   break;
 616                 }
 617             }
 618           return sizeof(insn);
 619         }
 620     }
 621   (*info->fprintf_func) (info->stream, "#%8x", insn);
 622   return sizeof(insn);
 623 }