opcodes/sparc-dis.c

   1 /* Print SPARC instructions.
   2    Copyright 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
   3    2000 Free Software Foundation, Inc.
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  18
  19 #include <stdio.h>
  20
  21 #include "sysdep.h"
  22 #include "opcode/sparc.h"
  23 #include "dis-asm.h"
  24 #include "libiberty.h"
  25 #include "opintl.h"
  26
  27 /* Bitmask of v9 architectures.  */
  28 #define MASK_V9 ((1 << SPARC_OPCODE_ARCH_V9) \
  29                  | (1 << SPARC_OPCODE_ARCH_V9A) \
  30                  | (1 << SPARC_OPCODE_ARCH_V9B))
  31 /* 1 if INSN is for v9 only.  */
  32 #define V9_ONLY_P(insn) (! ((insn)->architecture & ~MASK_V9))
  33 /* 1 if INSN is for v9.  */
  34 #define V9_P(insn) (((insn)->architecture & MASK_V9) != 0)
  35
  36 /* The sorted opcode table.  */
  37 static const struct sparc_opcode **sorted_opcodes;
  38
  39 /* For faster lookup, after insns are sorted they are hashed.  */
  40 /* ??? I think there is room for even more improvement.  */
  41
  42 #define HASH_SIZE 256
  43 /* It is important that we only look at insn code bits as that is how the
  44    opcode table is hashed.  OPCODE_BITS is a table of valid bits for each
  45    of the main types (0,1,2,3).  */
  46 static int opcode_bits[4] = { 0x01c00000, 0x0, 0x01f80000, 0x01f80000 };
  47 #define HASH_INSN(INSN) \
  48   ((((INSN) >> 24) & 0xc0) | (((INSN) & opcode_bits[((INSN) >> 30) & 3]) >> 19))
  49 struct opcode_hash {
  50   struct opcode_hash *next;
  51   const struct sparc_opcode *opcode;
  52 };
  53 static struct opcode_hash *opcode_hash_table[HASH_SIZE];
  54
  55 static void build_hash_table
  56   PARAMS ((const struct sparc_opcode **, struct opcode_hash **, int));
  57 static int is_delayed_branch PARAMS ((unsigned long));
  58 static int compare_opcodes PARAMS ((const PTR, const PTR));
  59 static int compute_arch_mask PARAMS ((unsigned long));
  60
  61 /* Sign-extend a value which is N bits long.  */
  62 #define SEX(value, bits) \
  63         ((((int)(value)) << ((8 * sizeof (int)) - bits))        \
  64                          >> ((8 * sizeof (int)) - bits) )
  65
  66 static  char *reg_names[] =
  67 { "g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7",
  68   "o0", "o1", "o2", "o3", "o4", "o5", "sp", "o7",
  69   "l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7",
  70   "i0", "i1", "i2", "i3", "i4", "i5", "fp", "i7",
  71   "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
  72   "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",
  73   "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",
  74   "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",
  75   "f32", "f33", "f34", "f35", "f36", "f37", "f38", "f39",
  76   "f40", "f41", "f42", "f43", "f44", "f45", "f46", "f47",
  77   "f48", "f49", "f50", "f51", "f52", "f53", "f54", "f55",
  78   "f56", "f57", "f58", "f59", "f60", "f61", "f62", "f63",
  79 /* psr, wim, tbr, fpsr, cpsr are v8 only.  */
  80   "y", "psr", "wim", "tbr", "pc", "npc", "fpsr", "cpsr"
  81 };
  82
  83 #define freg_names      (&reg_names[4 * 8])
  84
  85 /* These are ordered according to there register number in
  86    rdpr and wrpr insns.  */
  87 static char *v9_priv_reg_names[] =
  88 {
  89   "tpc", "tnpc", "tstate", "tt", "tick", "tba", "pstate", "tl",
  90   "pil", "cwp", "cansave", "canrestore", "cleanwin", "otherwin",
  91   "wstate", "fq"
  92   /* "ver" - special cased */
  93 };
  94
  95 /* These are ordered according to there register number in
  96    rd and wr insns (-16).  */
  97 static char *v9a_asr_reg_names[] =
  98 {
  99   "pcr", "pic", "dcr", "gsr", "set_softint", "clear_softint",
 100   "softint", "tick_cmpr", "sys_tick", "sys_tick_cmpr"
 101 };
 102
 103 /* Macros used to extract instruction fields.  Not all fields have
 104    macros defined here, only those which are actually used.  */
 105
 106 #define X_RD(i) (((i) >> 25) & 0x1f)
 107 #define X_RS1(i) (((i) >> 14) & 0x1f)
 108 #define X_LDST_I(i) (((i) >> 13) & 1)
 109 #define X_ASI(i) (((i) >> 5) & 0xff)
 110 #define X_RS2(i) (((i) >> 0) & 0x1f)
 111 #define X_IMM(i,n) (((i) >> 0) & ((1 << (n)) - 1))
 112 #define X_SIMM(i,n) SEX (X_IMM ((i), (n)), (n))
 113 #define X_DISP22(i) (((i) >> 0) & 0x3fffff)
 114 #define X_IMM22(i) X_DISP22 (i)
 115 #define X_DISP30(i) (((i) >> 0) & 0x3fffffff)
 116
 117 /* These are for v9.  */
 118 #define X_DISP16(i) (((((i) >> 20) & 3) << 14) | (((i) >> 0) & 0x3fff))
 119 #define X_DISP19(i) (((i) >> 0) & 0x7ffff)
 120 #define X_MEMBAR(i) ((i) & 0x7f)
 121
 122 /* Here is the union which was used to extract instruction fields
 123    before the shift and mask macros were written.
 124
 125    union sparc_insn
 126      {
 127        unsigned long int code;
 128        struct
 129          {
 130            unsigned int anop:2;
 131            #define      op      ldst.anop
 132            unsigned int anrd:5;
 133            #define      rd      ldst.anrd
 134            unsigned int op3:6;
 135            unsigned int anrs1:5;
 136            #define      rs1     ldst.anrs1
 137            unsigned int i:1;
 138            unsigned int anasi:8;
 139            #define      asi     ldst.anasi
 140            unsigned int anrs2:5;
 141            #define      rs2     ldst.anrs2
 142            #define      shcnt   rs2
 143          } ldst;
 144        struct
 145          {
 146            unsigned int anop:2, anrd:5, op3:6, anrs1:5, i:1;
 147            unsigned int IMM13:13;
 148            #define      imm13   IMM13.IMM13
 149          } IMM13;
 150        struct
 151          {
 152            unsigned int anop:2;
 153            unsigned int a:1;
 154            unsigned int cond:4;
 155            unsigned int op2:3;
 156            unsigned int DISP22:22;
 157            #define      disp22  branch.DISP22
 158            #define      imm22   disp22
 159          } branch;
 160        struct
 161          {
 162            unsigned int anop:2;
 163            unsigned int a:1;
 164            unsigned int z:1;
 165            unsigned int rcond:3;
 166            unsigned int op2:3;
 167            unsigned int DISP16HI:2;
 168            unsigned int p:1;
 169            unsigned int _rs1:5;
 170            unsigned int DISP16LO:14;
 171          } branch16;
 172        struct
 173          {
 174            unsigned int anop:2;
 175            unsigned int adisp30:30;
 176            #define      disp30  call.adisp30
 177          } call;
 178      };
 179
 180    */
 181
 182 /* Nonzero if INSN is the opcode for a delayed branch.  */
 183 static int
 184 is_delayed_branch (insn)
 185      unsigned long insn;
 186 {
 187   struct opcode_hash *op;
 188
 189   for (op = opcode_hash_table[HASH_INSN (insn)]; op; op = op->next)
 190     {
 191       CONST struct sparc_opcode *opcode = op->opcode;
 192       if ((opcode->match & insn) == opcode->match
 193           && (opcode->lose & insn) == 0)
 194         return (opcode->flags & F_DELAYED);
 195     }
 196   return 0;
 197 }
 198
 199 /* extern void qsort (); */
 200
 201 /* Records current mask of SPARC_OPCODE_ARCH_FOO values, used to pass value
 202    to compare_opcodes.  */
 203 static unsigned int current_arch_mask;
 204
 205 /* Print one instruction from MEMADDR on INFO->STREAM.
 206
 207    We suffix the instruction with a comment that gives the absolute
 208    address involved, as well as its symbolic form, if the instruction
 209    is preceded by a findable `sethi' and it either adds an immediate
 210    displacement to that register, or it is an `add' or `or' instruction
 211    on that register.  */
 212
 213 int
 214 print_insn_sparc (memaddr, info)
 215      bfd_vma memaddr;
 216      disassemble_info *info;
 217 {
 218   FILE *stream = info->stream;
 219   bfd_byte buffer[4];
 220   unsigned long insn;
 221   register struct opcode_hash *op;
 222   /* Nonzero of opcode table has been initialized.  */
 223   static int opcodes_initialized = 0;
 224   /* bfd mach number of last call.  */
 225   static unsigned long current_mach = 0;
 226   bfd_vma (*getword) PARAMS ((const unsigned char *));
 227
 228   if (!opcodes_initialized
 229       || info->mach != current_mach)
 230     {
 231       int i;
 232
 233       current_arch_mask = compute_arch_mask (info->mach);
 234
 235       if (!opcodes_initialized)
 236         sorted_opcodes = (const struct sparc_opcode **)
 237           xmalloc (sparc_num_opcodes * sizeof (struct sparc_opcode *));
 238       /* Reset the sorted table so we can resort it.  */
 239       for (i = 0; i < sparc_num_opcodes; ++i)
 240         sorted_opcodes[i] = &sparc_opcodes[i];
 241       qsort ((char *) sorted_opcodes, sparc_num_opcodes,
 242              sizeof (sorted_opcodes[0]), compare_opcodes);
 243
 244       build_hash_table (sorted_opcodes, opcode_hash_table, sparc_num_opcodes);
 245       current_mach = info->mach;
 246       opcodes_initialized = 1;
 247     }
 248
 249   {
 250     int status =
 251       (*info->read_memory_func) (memaddr, buffer, sizeof (buffer), info);
 252     if (status != 0)
 253       {
 254         (*info->memory_error_func) (status, memaddr, info);
 255         return -1;
 256       }
 257   }
 258
 259   /* On SPARClite variants such as DANlite (sparc86x), instructions
 260      are always big-endian even when the machine is in little-endian mode. */
 261   if (info->endian == BFD_ENDIAN_BIG || info->mach == bfd_mach_sparc_sparclite)
 262     getword = bfd_getb32;
 263   else
 264     getword = bfd_getl32;
 265
 266   insn = getword (buffer);
 267
 268   info->insn_info_valid = 1;                    /* We do return this info */
 269   info->insn_type = dis_nonbranch;              /* Assume non branch insn */
 270   info->branch_delay_insns = 0;                 /* Assume no delay */
 271   info->target = 0;                             /* Assume no target known */
 272
 273   for (op = opcode_hash_table[HASH_INSN (insn)]; op; op = op->next)
 274     {
 275       CONST struct sparc_opcode *opcode = op->opcode;
 276
 277       /* If the insn isn't supported by the current architecture, skip it.  */
 278       if (! (opcode->architecture & current_arch_mask))
 279         continue;
 280
 281       if ((opcode->match & insn) == opcode->match
 282           && (opcode->lose & insn) == 0)
 283         {
 284           /* Nonzero means that we have found an instruction which has
 285              the effect of adding or or'ing the imm13 field to rs1.  */
 286           int imm_added_to_rs1 = 0;
 287           int imm_ored_to_rs1 = 0;
 288
 289           /* Nonzero means that we have found a plus sign in the args
 290              field of the opcode table.  */
 291           int found_plus = 0;
 292
 293           /* Nonzero means we have an annulled branch.  */
 294           int is_annulled = 0;
 295
 296           /* Do we have an `add' or `or' instruction combining an
 297              immediate with rs1?  */
 298           if (opcode->match == 0x80102000) /* or */
 299             imm_ored_to_rs1 = 1;
 300           if (opcode->match == 0x80002000) /* add */
 301             imm_added_to_rs1 = 1;
 302
 303           if (X_RS1 (insn) != X_RD (insn)
 304               && strchr (opcode->args, 'r') != 0)
 305               /* Can't do simple format if source and dest are different.  */
 306               continue;
 307           if (X_RS2 (insn) != X_RD (insn)
 308               && strchr (opcode->args, 'O') != 0)
 309               /* Can't do simple format if source and dest are different.  */
 310               continue;
 311
 312           (*info->fprintf_func) (stream, opcode->name);
 313
 314           {
 315             register CONST char *s;
 316
 317             if (opcode->args[0] != ',')
 318               (*info->fprintf_func) (stream, " ");
 319             for (s = opcode->args; *s != '\0'; ++s)
 320               {
 321                 while (*s == ',')
 322                   {
 323                     (*info->fprintf_func) (stream, ",");
 324                     ++s;
 325                     switch (*s) {
 326                     case 'a':
 327                       (*info->fprintf_func) (stream, "a");
 328                       is_annulled = 1;
 329                       ++s;
 330                       continue;
 331                     case 'N':
 332                       (*info->fprintf_func) (stream, "pn");
 333                       ++s;
 334                       continue;
 335
 336                     case 'T':
 337                       (*info->fprintf_func) (stream, "pt");
 338                       ++s;
 339                       continue;
 340
 341                     default:
 342                       break;
 343                     }           /* switch on arg */
 344                   }             /* while there are comma started args */
 345
 346                 (*info->fprintf_func) (stream, " ");
 347
 348                 switch (*s)
 349                   {
 350                   case '+':
 351                     found_plus = 1;
 352
 353                     /* note fall-through */
 354                   default:
 355                     (*info->fprintf_func) (stream, "%c", *s);
 356                     break;
 357
 358                   case '#':
 359                     (*info->fprintf_func) (stream, "0");
 360                     break;
 361
 362 #define reg(n)  (*info->fprintf_func) (stream, "%%%s", reg_names[n])
 363                   case '1':
 364                   case 'r':
 365                     reg (X_RS1 (insn));
 366                     break;
 367
 368                   case '2':
 369                   case 'O':
 370                     reg (X_RS2 (insn));
 371                     break;
 372
 373                   case 'd':
 374                     reg (X_RD (insn));
 375                     break;
 376 #undef  reg
 377
 378 #define freg(n)         (*info->fprintf_func) (stream, "%%%s", freg_names[n])
 379 #define fregx(n)        (*info->fprintf_func) (stream, "%%%s", freg_names[((n) & ~1) | (((n) & 1) << 5)])
 380                   case 'e':
 381                     freg (X_RS1 (insn));
 382                     break;
 383                   case 'v':     /* double/even */
 384                   case 'V':     /* quad/multiple of 4 */
 385                     fregx (X_RS1 (insn));
 386                     break;
 387
 388                   case 'f':
 389                     freg (X_RS2 (insn));
 390                     break;
 391                   case 'B':     /* double/even */
 392                   case 'R':     /* quad/multiple of 4 */
 393                     fregx (X_RS2 (insn));
 394                     break;
 395
 396                   case 'g':
 397                     freg (X_RD (insn));
 398                     break;
 399                   case 'H':     /* double/even */
 400                   case 'J':     /* quad/multiple of 4 */
 401                     fregx (X_RD (insn));
 402                     break;
 403 #undef  freg
 404 #undef  fregx
 405
 406 #define creg(n) (*info->fprintf_func) (stream, "%%c%u", (unsigned int) (n))
 407                   case 'b':
 408                     creg (X_RS1 (insn));
 409                     break;
 410
 411                   case 'c':
 412                     creg (X_RS2 (insn));
 413                     break;
 414
 415                   case 'D':
 416                     creg (X_RD (insn));
 417                     break;
 418 #undef  creg
 419
 420                   case 'h':
 421                     (*info->fprintf_func) (stream, "%%hi(%#x)",
 422                                            ((unsigned) 0xFFFFFFFF
 423                                             & ((int) X_IMM22 (insn) << 10)));
 424                     break;
 425
 426                   case 'i':     /* 13 bit immediate */
 427                   case 'I':     /* 11 bit immediate */
 428                   case 'j':     /* 10 bit immediate */
 429                     {
 430                       int imm;
 431
 432                       if (*s == 'i')
 433                         imm = X_SIMM (insn, 13);
 434                       else if (*s == 'I')
 435                         imm = X_SIMM (insn, 11);
 436                       else
 437                         imm = X_SIMM (insn, 10);
 438
 439                       /* Check to see whether we have a 1+i, and take
 440                          note of that fact.
 441
 442                          Note: because of the way we sort the table,
 443                          we will be matching 1+i rather than i+1,
 444                          so it is OK to assume that i is after +,
 445                          not before it.  */
 446                       if (found_plus)
 447                         imm_added_to_rs1 = 1;
 448
 449                       if (imm <= 9)
 450                         (*info->fprintf_func) (stream, "%d", imm);
 451                       else
 452                         (*info->fprintf_func) (stream, "%#x", imm);
 453                     }
 454                     break;
 455
 456                   case 'X':     /* 5 bit unsigned immediate */
 457                   case 'Y':     /* 6 bit unsigned immediate */
 458                     {
 459                       int imm = X_IMM (insn, *s == 'X' ? 5 : 6);
 460
 461                       if (imm <= 9)
 462                         (info->fprintf_func) (stream, "%d", imm);
 463                       else
 464                         (info->fprintf_func) (stream, "%#x", (unsigned) imm);
 465                     }
 466                     break;
 467
 468                   case '3':
 469                     (info->fprintf_func) (stream, "%d", X_IMM (insn, 3));
 470                     break;
 471
 472                   case 'K':
 473                     {
 474                       int mask = X_MEMBAR (insn);
 475                       int bit = 0x40, printed_one = 0;
 476                       const char *name;
 477
 478                       if (mask == 0)
 479                         (info->fprintf_func) (stream, "0");
 480                       else
 481                         while (bit)
 482                           {
 483                             if (mask & bit)
 484                               {
 485                                 if (printed_one)
 486                                   (info->fprintf_func) (stream, "|");
 487                                 name = sparc_decode_membar (bit);
 488                                 (info->fprintf_func) (stream, "%s", name);
 489                                 printed_one = 1;
 490                               }
 491                             bit >>= 1;
 492                           }
 493                       break;
 494                     }
 495
 496                   case 'k':
 497                     info->target = memaddr + SEX (X_DISP16 (insn), 16) * 4;
 498                     (*info->print_address_func) (info->target, info);
 499                     break;
 500
 501                   case 'G':
 502                     info->target = memaddr + SEX (X_DISP19 (insn), 19) * 4;
 503                     (*info->print_address_func) (info->target, info);
 504                     break;
 505
 506                   case '6':
 507                   case '7':
 508                   case '8':
 509                   case '9':
 510                     (*info->fprintf_func) (stream, "%%fcc%c", *s - '6' + '0');
 511                     break;
 512
 513                   case 'z':
 514                     (*info->fprintf_func) (stream, "%%icc");
 515                     break;
 516
 517                   case 'Z':
 518                     (*info->fprintf_func) (stream, "%%xcc");
 519                     break;
 520
 521                   case 'E':
 522                     (*info->fprintf_func) (stream, "%%ccr");
 523                     break;
 524
 525                   case 's':
 526                     (*info->fprintf_func) (stream, "%%fprs");
 527                     break;
 528
 529                   case 'o':
 530                     (*info->fprintf_func) (stream, "%%asi");
 531                     break;
 532
 533                   case 'W':
 534                     (*info->fprintf_func) (stream, "%%tick");
 535                     break;
 536
 537                   case 'P':
 538                     (*info->fprintf_func) (stream, "%%pc");
 539                     break;
 540
 541                   case '?':
 542                     if (X_RS1 (insn) == 31)
 543                       (*info->fprintf_func) (stream, "%%ver");
 544                     else if ((unsigned) X_RS1 (insn) < 16)
 545                       (*info->fprintf_func) (stream, "%%%s",
 546                                              v9_priv_reg_names[X_RS1 (insn)]);
 547                     else
 548                       (*info->fprintf_func) (stream, "%%reserved");
 549                     break;
 550
 551                   case '!':
 552                     if ((unsigned) X_RD (insn) < 15)
 553                       (*info->fprintf_func) (stream, "%%%s",
 554                                              v9_priv_reg_names[X_RD (insn)]);
 555                     else
 556                       (*info->fprintf_func) (stream, "%%reserved");
 557                     break;
 558
 559                   case '/':
 560                     if (X_RS1 (insn) < 16 || X_RS1 (insn) > 25)
 561                       (*info->fprintf_func) (stream, "%%reserved");
 562                     else
 563                       (*info->fprintf_func) (stream, "%%%s",
 564                                              v9a_asr_reg_names[X_RS1 (insn)-16]);
 565                     break;
 566
 567                   case '_':
 568                     if (X_RD (insn) < 16 || X_RD (insn) > 25)
 569                       (*info->fprintf_func) (stream, "%%reserved");
 570                     else
 571                       (*info->fprintf_func) (stream, "%%%s",
 572                                              v9a_asr_reg_names[X_RD (insn)-16]);
 573                     break;
 574
 575                   case '*':
 576                     {
 577                       const char *name = sparc_decode_prefetch (X_RD (insn));
 578
 579                       if (name)
 580                         (*info->fprintf_func) (stream, "%s", name);
 581                       else
 582                         (*info->fprintf_func) (stream, "%d", X_RD (insn));
 583                       break;
 584                     }
 585
 586                   case 'M':
 587                     (*info->fprintf_func) (stream, "%%asr%d", X_RS1 (insn));
 588                     break;
 589
 590                   case 'm':
 591                     (*info->fprintf_func) (stream, "%%asr%d", X_RD (insn));
 592                     break;
 593
 594                   case 'L':
 595                     info->target = memaddr + SEX (X_DISP30 (insn), 30) * 4;
 596                     (*info->print_address_func) (info->target, info);
 597                     break;
 598
 599                   case 'n':
 600                     (*info->fprintf_func)
 601                       (stream, "%#x", SEX (X_DISP22 (insn), 22));
 602                     break;
 603
 604                   case 'l':
 605                     info->target = memaddr + SEX (X_DISP22 (insn), 22) * 4;
 606                     (*info->print_address_func) (info->target, info);
 607                     break;
 608
 609                   case 'A':
 610                     {
 611                       const char *name = sparc_decode_asi (X_ASI (insn));
 612
 613                       if (name)
 614                         (*info->fprintf_func) (stream, "%s", name);
 615                       else
 616                         (*info->fprintf_func) (stream, "(%d)", X_ASI (insn));
 617                       break;
 618                     }
 619
 620                   case 'C':
 621                     (*info->fprintf_func) (stream, "%%csr");
 622                     break;
 623
 624                   case 'F':
 625                     (*info->fprintf_func) (stream, "%%fsr");
 626                     break;
 627
 628                   case 'p':
 629                     (*info->fprintf_func) (stream, "%%psr");
 630                     break;
 631
 632                   case 'q':
 633                     (*info->fprintf_func) (stream, "%%fq");
 634                     break;
 635
 636                   case 'Q':
 637                     (*info->fprintf_func) (stream, "%%cq");
 638                     break;
 639
 640                   case 't':
 641                     (*info->fprintf_func) (stream, "%%tbr");
 642                     break;
 643
 644                   case 'w':
 645                     (*info->fprintf_func) (stream, "%%wim");
 646                     break;
 647
 648                   case 'x':
 649                     (*info->fprintf_func) (stream, "%d",
 650                                            ((X_LDST_I (insn) << 8)
 651                                             + X_ASI (insn)));
 652                     break;
 653
 654                   case 'y':
 655                     (*info->fprintf_func) (stream, "%%y");
 656                     break;
 657
 658                   case 'u':
 659                   case 'U':
 660                     {
 661                       int val = *s == 'U' ? X_RS1 (insn) : X_RD (insn);
 662                       const char *name = sparc_decode_sparclet_cpreg (val);
 663
 664                       if (name)
 665                         (*info->fprintf_func) (stream, "%s", name);
 666                       else
 667                         (*info->fprintf_func) (stream, "%%cpreg(%d)", val);
 668                       break;
 669                     }
 670                   }
 671               }
 672           }
 673
 674           /* If we are adding or or'ing something to rs1, then
 675              check to see whether the previous instruction was
 676              a sethi to the same register as in the sethi.
 677              If so, attempt to print the result of the add or
 678              or (in this context add and or do the same thing)
 679              and its symbolic value.  */
 680           if (imm_ored_to_rs1 || imm_added_to_rs1)
 681             {
 682               unsigned long prev_insn;
 683               int errcode;
 684
 685               errcode =
 686                 (*info->read_memory_func)
 687                   (memaddr - 4, buffer, sizeof (buffer), info);
 688               prev_insn = getword (buffer);
 689
 690               if (errcode == 0)
 691                 {
 692                   /* If it is a delayed branch, we need to look at the
 693                      instruction before the delayed branch.  This handles
 694                      sequences such as
 695
 696                      sethi %o1, %hi(_foo), %o1
 697                      call _printf
 698                      or %o1, %lo(_foo), %o1
 699                      */
 700
 701                   if (is_delayed_branch (prev_insn))
 702                     {
 703                       errcode = (*info->read_memory_func)
 704                         (memaddr - 8, buffer, sizeof (buffer), info);
 705                       prev_insn = getword (buffer);
 706                     }
 707                 }
 708
 709               /* If there was a problem reading memory, then assume
 710                  the previous instruction was not sethi.  */
 711               if (errcode == 0)
 712                 {
 713                   /* Is it sethi to the same register?  */
 714                   if ((prev_insn & 0xc1c00000) == 0x01000000
 715                       && X_RD (prev_insn) == X_RS1 (insn))
 716                     {
 717                       (*info->fprintf_func) (stream, "\t! ");
 718                       info->target =
 719                         ((unsigned) 0xFFFFFFFF
 720                          & ((int) X_IMM22 (prev_insn) << 10));
 721                       if (imm_added_to_rs1)
 722                         info->target += X_SIMM (insn, 13);
 723                       else
 724                         info->target |= X_SIMM (insn, 13);
 725                       (*info->print_address_func) (info->target, info);
 726                       info->insn_type = dis_dref;
 727                       info->data_size = 4;  /* FIXME!!! */
 728                     }
 729                 }
 730             }
 731
 732           if (opcode->flags & (F_UNBR|F_CONDBR|F_JSR))
 733             {
 734                 /* FIXME -- check is_annulled flag */
 735               if (opcode->flags & F_UNBR)
 736                 info->insn_type = dis_branch;
 737               if (opcode->flags & F_CONDBR)
 738                 info->insn_type = dis_condbranch;
 739               if (opcode->flags & F_JSR)
 740                 info->insn_type = dis_jsr;
 741               if (opcode->flags & F_DELAYED)
 742                 info->branch_delay_insns = 1;
 743             }
 744
 745           return sizeof (buffer);
 746         }
 747     }
 748
 749   info->insn_type = dis_noninsn;        /* Mark as non-valid instruction */
 750   (*info->fprintf_func) (stream, _("unknown"));
 751   return sizeof (buffer);
 752 }
 753
 754 /* Given BFD mach number, return a mask of SPARC_OPCODE_ARCH_FOO values.  */
 755
 756 static int
 757 compute_arch_mask (mach)
 758      unsigned long mach;
 759 {
 760   switch (mach)
 761     {
 762     case 0 :
 763     case bfd_mach_sparc :
 764       return SPARC_OPCODE_ARCH_MASK (SPARC_OPCODE_ARCH_V8);
 765     case bfd_mach_sparc_sparclet :
 766       return SPARC_OPCODE_ARCH_MASK (SPARC_OPCODE_ARCH_SPARCLET);
 767     case bfd_mach_sparc_sparclite :
 768     case bfd_mach_sparc_sparclite_le :
 769       /* sparclites insns are recognized by default (because that's how
 770          they've always been treated, for better or worse).  Kludge this by
 771          indicating generic v8 is also selected.  */
 772       return (SPARC_OPCODE_ARCH_MASK (SPARC_OPCODE_ARCH_SPARCLITE)
 773               | SPARC_OPCODE_ARCH_MASK (SPARC_OPCODE_ARCH_V8));
 774     case bfd_mach_sparc_v8plus :
 775     case bfd_mach_sparc_v9 :
 776       return SPARC_OPCODE_ARCH_MASK (SPARC_OPCODE_ARCH_V9);
 777     case bfd_mach_sparc_v8plusa :
 778     case bfd_mach_sparc_v9a :
 779       return SPARC_OPCODE_ARCH_MASK (SPARC_OPCODE_ARCH_V9A);
 780     case bfd_mach_sparc_v8plusb :
 781     case bfd_mach_sparc_v9b :
 782       return SPARC_OPCODE_ARCH_MASK (SPARC_OPCODE_ARCH_V9B);
 783     }
 784   abort ();
 785 }
 786
 787 /* Compare opcodes A and B.  */
 788
 789 static int
 790 compare_opcodes (a, b)
 791      const PTR a;
 792      const PTR b;
 793 {
 794   struct sparc_opcode *op0 = * (struct sparc_opcode **) a;
 795   struct sparc_opcode *op1 = * (struct sparc_opcode **) b;
 796   unsigned long int match0 = op0->match, match1 = op1->match;
 797   unsigned long int lose0 = op0->lose, lose1 = op1->lose;
 798   register unsigned int i;
 799
 800   /* If one (and only one) insn isn't supported by the current architecture,
 801      prefer the one that is.  If neither are supported, but they're both for
 802      the same architecture, continue processing.  Otherwise (both unsupported
 803      and for different architectures), prefer lower numbered arch's (fudged
 804      by comparing the bitmasks).  */
 805   if (op0->architecture & current_arch_mask)
 806     {
 807       if (! (op1->architecture & current_arch_mask))
 808         return -1;
 809     }
 810   else
 811     {
 812       if (op1->architecture & current_arch_mask)
 813         return 1;
 814       else if (op0->architecture != op1->architecture)
 815         return op0->architecture - op1->architecture;
 816     }
 817
 818   /* If a bit is set in both match and lose, there is something
 819      wrong with the opcode table.  */
 820   if (match0 & lose0)
 821     {
 822       fprintf
 823         (stderr,
 824          /* xgettext:c-format */
 825          _("Internal error:  bad sparc-opcode.h: \"%s\", %#.8lx, %#.8lx\n"),
 826          op0->name, match0, lose0);
 827       op0->lose &= ~op0->match;
 828       lose0 = op0->lose;
 829     }
 830
 831   if (match1 & lose1)
 832     {
 833       fprintf
 834         (stderr,
 835          /* xgettext:c-format */
 836          _("Internal error: bad sparc-opcode.h: \"%s\", %#.8lx, %#.8lx\n"),
 837          op1->name, match1, lose1);
 838       op1->lose &= ~op1->match;
 839       lose1 = op1->lose;
 840     }
 841
 842   /* Because the bits that are variable in one opcode are constant in
 843      another, it is important to order the opcodes in the right order.  */
 844   for (i = 0; i < 32; ++i)
 845     {
 846       unsigned long int x = 1 << i;
 847       int x0 = (match0 & x) != 0;
 848       int x1 = (match1 & x) != 0;
 849
 850       if (x0 != x1)
 851         return x1 - x0;
 852     }
 853
 854   for (i = 0; i < 32; ++i)
 855     {
 856       unsigned long int x = 1 << i;
 857       int x0 = (lose0 & x) != 0;
 858       int x1 = (lose1 & x) != 0;
 859
 860       if (x0 != x1)
 861         return x1 - x0;
 862     }
 863
 864   /* They are functionally equal.  So as long as the opcode table is
 865      valid, we can put whichever one first we want, on aesthetic grounds.  */
 866
 867   /* Our first aesthetic ground is that aliases defer to real insns.  */
 868   {
 869     int alias_diff = (op0->flags & F_ALIAS) - (op1->flags & F_ALIAS);
 870     if (alias_diff != 0)
 871       /* Put the one that isn't an alias first.  */
 872       return alias_diff;
 873   }
 874
 875   /* Except for aliases, two "identical" instructions had
 876      better have the same opcode.  This is a sanity check on the table.  */
 877   i = strcmp (op0->name, op1->name);
 878   if (i)
 879     {
 880       if (op0->flags & F_ALIAS) /* If they're both aliases, be arbitrary. */
 881         return i;
 882       else
 883         fprintf (stderr,
 884                  /* xgettext:c-format */
 885                  _("Internal error: bad sparc-opcode.h: \"%s\" == \"%s\"\n"),
 886                  op0->name, op1->name);
 887     }
 888
 889   /* Fewer arguments are preferred.  */
 890   {
 891     int length_diff = strlen (op0->args) - strlen (op1->args);
 892     if (length_diff != 0)
 893       /* Put the one with fewer arguments first.  */
 894       return length_diff;
 895   }
 896
 897   /* Put 1+i before i+1.  */
 898   {
 899     char *p0 = (char *) strchr (op0->args, '+');
 900     char *p1 = (char *) strchr (op1->args, '+');
 901
 902     if (p0 && p1)
 903       {
 904         /* There is a plus in both operands.  Note that a plus
 905            sign cannot be the first character in args,
 906            so the following [-1]'s are valid.  */
 907         if (p0[-1] == 'i' && p1[1] == 'i')
 908           /* op0 is i+1 and op1 is 1+i, so op1 goes first.  */
 909           return 1;
 910         if (p0[1] == 'i' && p1[-1] == 'i')
 911           /* op0 is 1+i and op1 is i+1, so op0 goes first.  */
 912           return -1;
 913       }
 914   }
 915
 916   /* Put 1,i before i,1.  */
 917   {
 918     int i0 = strncmp (op0->args, "i,1", 3) == 0;
 919     int i1 = strncmp (op1->args, "i,1", 3) == 0;
 920
 921     if (i0 ^ i1)
 922       return i0 - i1;
 923   }
 924
 925   /* They are, as far as we can tell, identical.
 926      Since qsort may have rearranged the table partially, there is
 927      no way to tell which one was first in the opcode table as
 928      written, so just say there are equal.  */
 929   /* ??? This is no longer true now that we sort a vector of pointers,
 930      not the table itself.  */
 931   return 0;
 932 }
 933
 934 /* Build a hash table from the opcode table.
 935    OPCODE_TABLE is a sorted list of pointers into the opcode table.  */
 936
 937 static void
 938 build_hash_table (opcode_table, hash_table, num_opcodes)
 939      const struct sparc_opcode **opcode_table;
 940      struct opcode_hash **hash_table;
 941      int num_opcodes;
 942 {
 943   register int i;
 944   int hash_count[HASH_SIZE];
 945   static struct opcode_hash *hash_buf = NULL;
 946
 947   /* Start at the end of the table and work backwards so that each
 948      chain is sorted.  */
 949
 950   memset (hash_table, 0, HASH_SIZE * sizeof (hash_table[0]));
 951   memset (hash_count, 0, HASH_SIZE * sizeof (hash_count[0]));
 952   if (hash_buf != NULL)
 953     free (hash_buf);
 954   hash_buf = (struct opcode_hash *) xmalloc (sizeof (struct opcode_hash) * num_opcodes);
 955   for (i = num_opcodes - 1; i >= 0; --i)
 956     {
 957       register int hash = HASH_INSN (opcode_table[i]->match);
 958       register struct opcode_hash *h = &hash_buf[i];
 959       h->next = hash_table[hash];
 960       h->opcode = opcode_table[i];
 961       hash_table[hash] = h;
 962       ++hash_count[hash];
 963     }
 964
 965 #if 0 /* for debugging */
 966   {
 967     int min_count = num_opcodes, max_count = 0;
 968     int total;
 969
 970     for (i = 0; i < HASH_SIZE; ++i)
 971       {
 972         if (hash_count[i] < min_count)
 973           min_count = hash_count[i];
 974         if (hash_count[i] > max_count)
 975           max_count = hash_count[i];
 976         total += hash_count[i];
 977       }
 978
 979     printf ("Opcode hash table stats: min %d, max %d, ave %f\n",
 980             min_count, max_count, (double) total / HASH_SIZE);
 981   }
 982 #endif
 983 }