binutils/m68k-pinsn.c

   1 /* Print m68k instructions for objdump
   2    Copyright (C) 1986, 1987, 1989, 1991 Free Software Foundation, Inc.
   3
   4
   5 This file is part of the binutils.
   6
   7 The binutils are 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, or (at your option)
  10 any later version.
  11
  12 The binutils are distributed in the hope that they 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 the binutils; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21
  22 #include "bfd.h"
  23 #include "sysdep.h"
  24 #include <stdio.h>
  25 #include "opcode/m68k.h"
  26
  27 #ifndef GDB
  28 #define fprintf_filtered fprintf
  29 #define fputs_filtered fputs
  30 #endif
  31
  32 /* Sign-extend an (unsigned char). */
  33 #if __STDC__ == 1
  34 #define COERCE_SIGNED_CHAR(ch) ((signed char)(ch))
  35 #else
  36 #define COERCE_SIGNED_CHAR(ch) ((int)(((ch) ^ 0x80) & 0xFF) - 128)
  37 #endif
  38
  39 extern void print_address();
  40
  41 /* 68k instructions are never longer than this many bytes.  */
  42 #define MAXLEN 22
  43
  44 /* Number of elements in the opcode table.  */
  45 #define NOPCODES (sizeof m68k_opcodes / sizeof m68k_opcodes[0])
  46
  47 extern char *reg_names[];
  48 char *fpcr_names[] = { "", "fpiar", "fpsr", "fpiar/fpsr", "fpcr",
  49                      "fpiar/fpcr", "fpsr/fpcr", "fpiar/fpsr/fpcr"};
  50
  51 char *reg_names[] = {"d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", "ps", "pc"};
  52 static unsigned char *print_insn_arg ();
  53 static unsigned char *print_indexed ();
  54 static void print_base ();
  55 static int fetch_arg ();
  56
  57 #define NEXTBYTE(p)  (p += 2, COERCE_SIGNED_CHAR(p[-1]))
  58
  59 #define NEXTWORD(p)  \
  60   (p += 2, ((((char *)p)[-2]) << 8) + p[-1])
  61
  62 #define NEXTLONG(p)  \
  63   (p += 4, (((((p[-4] << 8) + p[-3]) << 8) + p[-2]) << 8) + p[-1])
  64
  65 /* NEXTSINGLE and NEXTDOUBLE handle alignment problems, but not
  66  * byte-swapping or other float format differences.  FIXME! */
  67
  68 union number {
  69     double d;
  70     float f;
  71     char c[10];
  72 };
  73
  74 #define NEXTSINGLE(val, p) \
  75   { int i; union number u;\
  76     for (i = 0; i < sizeof(float); i++) u.c[i] = *p++; \
  77     val = u.f; }
  78
  79 #define NEXTDOUBLE(val, p) \
  80   { int i; union number u;\
  81     for (i = 0; i < sizeof(double); i++) u.c[i] = *p++; \
  82     val = u.d; }
  83
  84 #define NEXTEXTEND(p) \
  85   (p += 12, 0.0)        /* Need a function to convert from extended to double
  86                            precision... */
  87
  88 #define NEXTPACKED(p) \
  89   (p += 12, 0.0)        /* Need a function to convert from packed to double
  90                            precision.   Actually, it's easier to print a
  91                            packed number than a double anyway, so maybe
  92                            there should be a special case to handle this... */
  93 \f
  94 /* Print the m68k instruction at address MEMADDR in debugged memory,
  95    on STREAM.  Returns length of the instruction, in bytes.  */
  96
  97 int
  98 print_insn_m68k(addr, buffer, stream)
  99      bfd_vma addr;
 100 unsigned    char *buffer;
 101      FILE *stream;
 102 {
 103   register unsigned int i;
 104   register unsigned char *p;
 105   register char *d;
 106   register unsigned int bestmask;
 107   int best;
 108
 109
 110
 111   bestmask = 0;
 112   best = -1;
 113   for (i = 0; i < NOPCODES; i++)
 114     {
 115       register unsigned int opcode = m68k_opcodes[i].opcode;
 116       register unsigned int match = m68k_opcodes[i].match;
 117       if (((0xff & buffer[0] & (match >> 24)) == (0xff & (opcode >> 24)))
 118           && ((0xff & buffer[1] & (match >> 16)) == (0xff & (opcode >> 16)))
 119           && ((0xff & buffer[2] & (match >> 8)) == (0xff & (opcode >> 8)))
 120           && ((0xff & buffer[3] & match) == (0xff & opcode)))
 121         {
 122           /* Don't use for printout the variants of divul and divsl
 123              that have the same register number in two places.
 124              The more general variants will match instead.  */
 125           for (d = m68k_opcodes[i].args; *d; d += 2)
 126             if (d[1] == 'D')
 127               break;
 128
 129           /* Don't use for printout the variants of most floating
 130              point coprocessor instructions which use the same
 131              register number in two places, as above. */
 132           if (*d == 0)
 133             for (d = m68k_opcodes[i].args; *d; d += 2)
 134               if (d[1] == 't')
 135                 break;
 136
 137           if (*d == 0 && match > bestmask)
 138             {
 139               best = i;
 140               bestmask = match;
 141             }
 142         }
 143     }
 144
 145   /* Handle undefined instructions.  */
 146   if (best < 0)
 147     {
 148       fprintf_filtered (stream, "0%o", (unsigned) (buffer[0] << 8) + buffer[1]);
 149       return 2;
 150     }
 151
 152   fprintf_filtered (stream, "%s", m68k_opcodes[best].name);
 153
 154   /* Point at first word of argument data,
 155      and at descriptor for first argument.  */
 156   p = buffer + 2;
 157
 158   /* Why do this this way? -MelloN */
 159   for (d = m68k_opcodes[best].args; *d; d += 2)
 160     {
 161       if (d[0] == '#')
 162         {
 163           if (d[1] == 'l' && p - buffer < 6)
 164             p = buffer + 6;
 165           else if (p - buffer < 4 && d[1] != 'C' && d[1] != '8' )
 166             p = buffer + 4;
 167         }
 168       if (d[1] >= '1' && d[1] <= '3' && p - buffer < 4)
 169         p = buffer + 4;
 170       if (d[1] >= '4' && d[1] <= '6' && p - buffer < 6)
 171         p = buffer + 6;
 172       if ((d[0] == 'L' || d[0] == 'l') && d[1] == 'w' && p - buffer < 4)
 173         p = buffer + 4;
 174     }
 175
 176   d = m68k_opcodes[best].args;
 177
 178   if (*d)
 179     fputs_filtered (" ", stream);
 180
 181   while (*d)
 182     {
 183       p = print_insn_arg (d, buffer, p, addr + p - buffer, stream);
 184       d += 2;
 185       if (*d && *(d - 2) != 'I' && *d != 'k')
 186         fputs_filtered (",", stream);
 187     }
 188   return p - buffer;
 189 }
 190
 191 static unsigned char *
 192 print_insn_arg (d, buffer, p, addr, stream)
 193      char *d;
 194      unsigned char *buffer;
 195      register unsigned char *p;
 196  bfd_vma addr;          /* PC for this arg to be relative to */
 197      FILE *stream;
 198 {
 199   register int val = 0;
 200   register int place = d[1];
 201   int regno;
 202   register char *regname;
 203   register unsigned char *p1;
 204   register double flval = 0;
 205   int flt_p;
 206
 207   switch (*d)
 208     {
 209     case 'C':
 210       fprintf_filtered (stream, "ccr");
 211       break;
 212
 213     case 'S':
 214       fprintf_filtered (stream, "sr");
 215       break;
 216
 217     case 'U':
 218       fprintf_filtered (stream, "usp");
 219       break;
 220
 221     case 'J':
 222       {
 223         static struct { char *name; int value; } names[]
 224           = {{"sfc", 0x000}, {"dfc", 0x001}, {"cacr", 0x002},
 225              {"usp", 0x800}, {"vbr", 0x801}, {"caar", 0x802},
 226              {"msp", 0x803}, {"isp", 0x804}};
 227
 228         val = fetch_arg (buffer, place, 12);
 229         for (regno = sizeof names / sizeof names[0] - 1; regno >= 0; regno--)
 230           if (names[regno].value == val)
 231             {
 232               fprintf_filtered (stream, names[regno].name);
 233               break;
 234             }
 235         if (regno < 0)
 236           fprintf_filtered (stream, "%d", val);
 237       }
 238       break;
 239
 240     case 'Q':
 241       val = fetch_arg (buffer, place, 3);
 242       /* 0 means 8, except for the bkpt instruction... */
 243       if (val == 0 && d[1] != 's')
 244           val = 8;
 245       fprintf_filtered (stream, "#%d", val);
 246       break;
 247
 248     case 'M':
 249       val = fetch_arg (buffer, place, 8);
 250       if (val & 0x80)
 251         val = val - 0x100;
 252       fprintf_filtered (stream, "#%d", val);
 253       break;
 254
 255     case 'T':
 256       val = fetch_arg (buffer, place, 4);
 257       fprintf_filtered (stream, "#%d", val);
 258       break;
 259
 260     case 'D':
 261       fprintf_filtered (stream, "%s", reg_names[fetch_arg (buffer, place, 3)]);
 262       break;
 263
 264     case 'A':
 265       fprintf_filtered (stream, "%s",
 266                         reg_names[fetch_arg (buffer, place, 3) + 010]);
 267       break;
 268
 269     case 'R':
 270       fprintf_filtered (stream, "%s", reg_names[fetch_arg (buffer, place, 4)]);
 271       break;
 272
 273     case 'r':
 274       fprintf_filtered (stream, "%s@", reg_names[fetch_arg (buffer, place, 4)]);
 275       break;
 276
 277     case 'F':
 278       fprintf_filtered (stream, "fp%d", fetch_arg (buffer, place, 3));
 279       break;
 280
 281     case 'O':
 282       val = fetch_arg (buffer, place, 6);
 283       if (val & 0x20)
 284         fprintf_filtered (stream, "%s", reg_names [val & 7]);
 285       else
 286         fprintf_filtered (stream, "%d", val);
 287       break;
 288
 289     case '+':
 290       fprintf_filtered (stream, "%s@+",
 291                         reg_names[fetch_arg (buffer, place, 3) + 8]);
 292       break;
 293
 294     case '-':
 295       fprintf_filtered (stream, "%s@-",
 296                reg_names[fetch_arg (buffer, place, 3) + 8]);
 297       break;
 298
 299     case 'k':
 300       if (place == 'k')
 301         fprintf_filtered (stream, "{%s}", reg_names[fetch_arg (buffer, place, 3)]);
 302       else if (place == 'C')
 303         {
 304           val = fetch_arg (buffer, place, 7);
 305           if ( val > 63 )               /* This is a signed constant. */
 306             val -= 128;
 307           fprintf_filtered (stream, "{#%d}", val);
 308         }
 309       else
 310         fprintf_filtered(stderr, "Invalid arg format in opcode table: \"%c%c\".",
 311                *d, place);
 312       break;
 313
 314     case '#':
 315     case '^':
 316       p1 = buffer + (*d == '#' ? 2 : 4);
 317       if (place == 's')
 318         val = fetch_arg (buffer, place, 4);
 319       else if (place == 'C')
 320         val = fetch_arg (buffer, place, 7);
 321       else if (place == '8')
 322         val = fetch_arg (buffer, place, 3);
 323       else if (place == '3')
 324         val = fetch_arg (buffer, place, 8);
 325       else if (place == 'b')
 326         val = NEXTBYTE (p1);
 327       else if (place == 'w')
 328         val = NEXTWORD (p1);
 329       else if (place == 'l')
 330         val = NEXTLONG (p1);
 331       else
 332         fprintf_filtered(stderr, "Invalid arg format in opcode table: \"%c%c\".",
 333                *d, place);
 334       fprintf_filtered (stream, "#%d", val);
 335       break;
 336
 337     case 'B':
 338       if (place == 'b')
 339         val = NEXTBYTE (p);
 340       else if (place == 'B')
 341         val = COERCE_SIGNED_CHAR(buffer[1]);
 342       else if (place == 'w' || place == 'W')
 343         val = NEXTWORD (p);
 344       else if (place == 'l' || place == 'L')
 345         val = NEXTLONG (p);
 346       else if (place == 'g')
 347         {
 348           val = ((char *)buffer)[1];
 349           if (val == 0)
 350             val = NEXTWORD (p);
 351           else if (val == -1)
 352             val = NEXTLONG (p);
 353         }
 354       else if (place == 'c')
 355         {
 356           if (buffer[1] & 0x40)         /* If bit six is one, long offset */
 357             val = NEXTLONG (p);
 358           else
 359             val = NEXTWORD (p);
 360         }
 361       else
 362         fprintf_filtered(stderr, "Invalid arg format in opcode table: \"%c%c\".",
 363                *d, place);
 364       print_address (addr + val, stream);
 365       break;
 366
 367     case 'd':
 368       val = NEXTWORD (p);
 369       fprintf_filtered (stream, "%s@(%d)",
 370                         reg_names[fetch_arg (buffer, place, 3)], val);
 371       break;
 372
 373     case 's':
 374       fprintf_filtered (stream, "%s",
 375                         fpcr_names[fetch_arg (buffer, place, 3)]);
 376       break;
 377
 378     case 'I':
 379       val = fetch_arg (buffer, 'd', 3);           /* Get coprocessor ID... */
 380       if (val != 1)                             /* Unusual coprocessor ID? */
 381         fprintf_filtered (stream, "(cpid=%d) ", val);
 382       if (place == 'i')
 383         p += 2;                      /* Skip coprocessor extended operands */
 384       break;
 385
 386     case '*':
 387     case '~':
 388     case '%':
 389     case ';':
 390     case '@':
 391     case '!':
 392     case '$':
 393     case '?':
 394     case '/':
 395     case '&':
 396
 397       if (place == 'd')
 398         {
 399           val = fetch_arg (buffer, 'x', 6);
 400           val = ((val & 7) << 3) + ((val >> 3) & 7);
 401         }
 402       else
 403         val = fetch_arg (buffer, 's', 6);
 404
 405       /* Get register number assuming address register.  */
 406       regno = (val & 7) + 8;
 407       regname = reg_names[regno];
 408       switch (val >> 3)
 409         {
 410         case 0:
 411           fprintf_filtered (stream, "%s", reg_names[val]);
 412           break;
 413
 414         case 1:
 415           fprintf_filtered (stream, "%s", regname);
 416           break;
 417
 418         case 2:
 419           fprintf_filtered (stream, "%s@", regname);
 420           break;
 421
 422         case 3:
 423           fprintf_filtered (stream, "%s@+", regname);
 424           break;
 425
 426         case 4:
 427           fprintf_filtered (stream, "%s@-", regname);
 428           break;
 429
 430         case 5:
 431           val = NEXTWORD (p);
 432           fprintf_filtered (stream, "%s@(%d)", regname, val);
 433           break;
 434
 435         case 6:
 436           p = print_indexed (regno, p, addr, stream);
 437           break;
 438
 439         case 7:
 440           switch (val & 7)
 441             {
 442             case 0:
 443               val = NEXTWORD (p);
 444               fprintf_filtered (stream, "@#");
 445               print_address (val, stream);
 446               break;
 447
 448             case 1:
 449               val = NEXTLONG (p);
 450               fprintf_filtered (stream, "@#");
 451               print_address (val, stream);
 452               break;
 453
 454             case 2:
 455               val = NEXTWORD (p);
 456               print_address (addr + val, stream);
 457               break;
 458
 459             case 3:
 460               p = print_indexed (-1, p, addr, stream);
 461               break;
 462
 463             case 4:
 464               flt_p = 1;        /* Assume it's a float... */
 465               switch( place )
 466               {
 467                 case 'b':
 468                   val = NEXTBYTE (p);
 469                   flt_p = 0;
 470                   break;
 471
 472                 case 'w':
 473                   val = NEXTWORD (p);
 474                   flt_p = 0;
 475                   break;
 476
 477                 case 'l':
 478                   val = NEXTLONG (p);
 479                   flt_p = 0;
 480                   break;
 481
 482                 case 'f':
 483                   NEXTSINGLE(flval, p);
 484                   break;
 485
 486                 case 'F':
 487                   NEXTDOUBLE(flval, p);
 488                   break;
 489
 490                 case 'x':
 491                   flval = NEXTEXTEND(p);
 492                   break;
 493
 494                 case 'p':
 495                   flval = NEXTPACKED(p);
 496                   break;
 497
 498                 default:
 499                   fprintf_filtered(stderr, "Invalid arg format in opcode table: \"%c%c\".",
 500                        *d, place);
 501               }
 502               if ( flt_p )      /* Print a float? */
 503                 fprintf_filtered (stream, "#%g", flval);
 504               else
 505                 fprintf_filtered (stream, "#%d", val);
 506               break;
 507
 508             default:
 509               fprintf_filtered (stream, "<invalid address mode 0%o>", (unsigned) val);
 510             }
 511         }
 512       break;
 513
 514     case 'L':
 515     case 'l':
 516         if (place == 'w')
 517           {
 518             char doneany;
 519             p1 = buffer + 2;
 520             val = NEXTWORD (p1);
 521             /* Move the pointer ahead if this point is farther ahead
 522                than the last.  */
 523             p = p1 > p ? p1 : p;
 524             if (val == 0)
 525               {
 526                 fputs_filtered ("#0", stream);
 527                 break;
 528               }
 529             if (*d == 'l')
 530               {
 531                 register int newval = 0;
 532                 for (regno = 0; regno < 16; ++regno)
 533                   if (val & (0x8000 >> regno))
 534                     newval |= 1 << regno;
 535                 val = newval;
 536               }
 537             val &= 0xffff;
 538             doneany = 0;
 539             for (regno = 0; regno < 16; ++regno)
 540               if (val & (1 << regno))
 541                 {
 542                   int first_regno;
 543                   if (doneany)
 544                     fputs_filtered ("/", stream);
 545                   doneany = 1;
 546                   fprintf_filtered (stream, "%s", reg_names[regno]);
 547                   first_regno = regno;
 548                   while (val & (1 << (regno + 1)))
 549                     ++regno;
 550                   if (regno > first_regno)
 551                     fprintf_filtered (stream, "-%s", reg_names[regno]);
 552                 }
 553           }
 554         else if (place == '3')
 555           {
 556             /* `fmovem' insn.  */
 557             char doneany;
 558             val = fetch_arg (buffer, place, 8);
 559             if (val == 0)
 560               {
 561                 fputs_filtered ("#0", stream);
 562                 break;
 563               }
 564             if (*d == 'l')
 565               {
 566                 register int newval = 0;
 567                 for (regno = 0; regno < 8; ++regno)
 568                   if (val & (0x80 >> regno))
 569                     newval |= 1 << regno;
 570                 val = newval;
 571               }
 572             val &= 0xff;
 573             doneany = 0;
 574             for (regno = 0; regno < 8; ++regno)
 575               if (val & (1 << regno))
 576                 {
 577                   int first_regno;
 578                   if (doneany)
 579                     fputs_filtered ("/", stream);
 580                   doneany = 1;
 581                   fprintf_filtered (stream, "fp%d", regno);
 582                   first_regno = regno;
 583                   while (val & (1 << (regno + 1)))
 584                     ++regno;
 585                   if (regno > first_regno)
 586                     fprintf_filtered (stream, "-fp%d", regno);
 587                 }
 588           }
 589         else
 590           goto de_fault;
 591       break;
 592
 593     default:  de_fault:
 594       fprintf_filtered(stderr, "Invalid arg format in opcode table: \"%c\".", *d);
 595     }
 596
 597   return (unsigned char *) p;
 598 }
 599
 600 /* Fetch BITS bits from a position in the instruction specified by CODE.
 601    CODE is a "place to put an argument", or 'x' for a destination
 602    that is a general address (mode and register).
 603    BUFFER contains the instruction.  */
 604
 605 static int
 606 fetch_arg (buffer, code, bits)
 607      unsigned char *buffer;
 608      char code;
 609      int bits;
 610 {
 611   register int val = 0;
 612   switch (code)
 613     {
 614     case 's':
 615       val = buffer[1];
 616       break;
 617
 618     case 'd':                   /* Destination, for register or quick.  */
 619       val = (buffer[0] << 8) + buffer[1];
 620       val >>= 9;
 621       break;
 622
 623     case 'x':                   /* Destination, for general arg */
 624       val = (buffer[0] << 8) + buffer[1];
 625       val >>= 6;
 626       break;
 627
 628     case 'k':
 629       val = (buffer[3] >> 4);
 630       break;
 631
 632     case 'C':
 633       val = buffer[3];
 634       break;
 635
 636     case '1':
 637       val = (buffer[2] << 8) + buffer[3];
 638       val >>= 12;
 639       break;
 640
 641     case '2':
 642       val = (buffer[2] << 8) + buffer[3];
 643       val >>= 6;
 644       break;
 645
 646     case '3':
 647     case 'j':
 648       val = (buffer[2] << 8) + buffer[3];
 649       break;
 650
 651     case '4':
 652       val = (buffer[4] << 8) + buffer[5];
 653       val >>= 12;
 654       break;
 655
 656     case '5':
 657       val = (buffer[4] << 8) + buffer[5];
 658       val >>= 6;
 659       break;
 660
 661     case '6':
 662       val = (buffer[4] << 8) + buffer[5];
 663       break;
 664
 665     case '7':
 666       val = (buffer[2] << 8) + buffer[3];
 667       val >>= 7;
 668       break;
 669
 670     case '8':
 671       val = (buffer[2] << 8) + buffer[3];
 672       val >>= 10;
 673       break;
 674
 675     default:
 676       abort ();
 677     }
 678
 679   switch (bits)
 680     {
 681     case 3:
 682       return val & 7;
 683     case 4:
 684       return val & 017;
 685     case 5:
 686       return val & 037;
 687     case 6:
 688       return val & 077;
 689     case 7:
 690       return val & 0177;
 691     case 8:
 692       return val & 0377;
 693     case 12:
 694       return val & 07777;
 695     default:
 696       abort ();
 697       return(0);
 698     }
 699 } /* fetch_arg() */
 700
 701 /* Print an indexed argument.  The base register is BASEREG (-1 for pc).
 702    P points to extension word, in buffer.
 703    ADDR is the nominal core address of that extension word.  */
 704
 705 static unsigned char *
 706 print_indexed (basereg, p, addr, stream)
 707      int basereg;
 708      unsigned char *p;
 709      FILE *stream;
 710 bfd_vma addr;
 711 {
 712   register int word;
 713   static char *scales[] = {"", "*2", "*4", "*8"};
 714   register int base_disp;
 715   register int outer_disp;
 716   char buf[40];
 717
 718   word = NEXTWORD (p);
 719
 720   /* Generate the text for the index register.
 721      Where this will be output is not yet determined.  */
 722   sprintf (buf, "[%s.%c%s]",
 723            reg_names[(word >> 12) & 0xf],
 724            (word & 0x800) ? 'l' : 'w',
 725            scales[(word >> 9) & 3]);
 726
 727   /* Handle the 68000 style of indexing.  */
 728
 729   if ((word & 0x100) == 0)
 730     {
 731       print_base (basereg,
 732                   ((word & 0x80) ? word | 0xff00 : word & 0xff)
 733                   + ((basereg == -1) ? addr : 0),
 734                   stream);
 735       fputs_filtered (buf, stream);
 736       return p;
 737     }
 738
 739   /* Handle the generalized kind.  */
 740   /* First, compute the displacement to add to the base register.  */
 741
 742   if (word & 0200)
 743     basereg = -2;
 744   if (word & 0100)
 745     buf[0] = 0;
 746   base_disp = 0;
 747   switch ((word >> 4) & 3)
 748     {
 749     case 2:
 750       base_disp = NEXTWORD (p);
 751       break;
 752     case 3:
 753       base_disp = NEXTLONG (p);
 754     }
 755   if (basereg == -1)
 756     base_disp += addr;
 757
 758   /* Handle single-level case (not indirect) */
 759
 760   if ((word & 7) == 0)
 761     {
 762       print_base (basereg, base_disp, stream);
 763       fputs_filtered (buf, stream);
 764       return p;
 765     }
 766
 767   /* Two level.  Compute displacement to add after indirection.  */
 768
 769   outer_disp = 0;
 770   switch (word & 3)
 771     {
 772     case 2:
 773       outer_disp = NEXTWORD (p);
 774       break;
 775     case 3:
 776       outer_disp = NEXTLONG (p);
 777     }
 778
 779   fprintf_filtered (stream, "%d(", outer_disp);
 780   print_base (basereg, base_disp, stream);
 781
 782   /* If postindexed, print the closeparen before the index.  */
 783   if (word & 4)
 784     fprintf_filtered (stream, ")%s", buf);
 785   /* If preindexed, print the closeparen after the index.  */
 786   else
 787     fprintf_filtered (stream, "%s)", buf);
 788
 789   return p;
 790 }
 791
 792 /* Print a base register REGNO and displacement DISP, on STREAM.
 793    REGNO = -1 for pc, -2 for none (suppressed).  */
 794
 795 static void
 796 print_base (regno, disp, stream)
 797      int regno;
 798      int disp;
 799      FILE *stream;
 800 {
 801   if (regno == -2)
 802     fprintf_filtered (stream, "%d", disp);
 803   else if (regno == -1)
 804     fprintf_filtered (stream, "0x%x", (unsigned) disp);
 805   else
 806     fprintf_filtered (stream, "%d(%s)", disp, reg_names[regno]);
 807 }