opcodes/m68k-dis.c

   1 /* Print Motorola 68k instructions.
   2    Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
   3    1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
   4    Free Software Foundation, Inc.
   5
   6    This file is part of the GNU opcodes library.
   7
   8    This library is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3, or (at your option)
  11    any later version.
  12
  13    It is distributed in the hope that it will be useful, but WITHOUT
  14    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  16    License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  21    MA 02110-1301, USA.  */
  22
  23 #include "sysdep.h"
  24 #include "dis-asm.h"
  25 #include "floatformat.h"
  26 #include "libiberty.h"
  27 #include "opintl.h"
  28
  29 #include "opcode/m68k.h"
  30
  31 /* Local function prototypes.  */
  32
  33 const char * const fpcr_names[] =
  34 {
  35   "", "%fpiar", "%fpsr", "%fpiar/%fpsr", "%fpcr",
  36   "%fpiar/%fpcr", "%fpsr/%fpcr", "%fpiar/%fpsr/%fpcr"
  37 };
  38
  39 static char *const reg_names[] =
  40 {
  41   "%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7",
  42   "%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%fp", "%sp",
  43   "%ps", "%pc"
  44 };
  45
  46 /* Name of register halves for MAC/EMAC.
  47    Seperate from reg_names since 'spu', 'fpl' look weird.  */
  48 static char *const reg_half_names[] =
  49 {
  50   "%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7",
  51   "%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%a6", "%a7",
  52   "%ps", "%pc"
  53 };
  54
  55 /* Sign-extend an (unsigned char).  */
  56 #if __STDC__ == 1
  57 #define COERCE_SIGNED_CHAR(ch) ((signed char) (ch))
  58 #else
  59 #define COERCE_SIGNED_CHAR(ch) ((int) (((ch) ^ 0x80) & 0xFF) - 128)
  60 #endif
  61
  62 /* Get a 1 byte signed integer.  */
  63 #define NEXTBYTE(p, val)                        \
  64   do                                            \
  65     {                                           \
  66       p += 2;                                   \
  67       if (!FETCH_DATA (info, p))                \
  68         return -3;                              \
  69       val = COERCE_SIGNED_CHAR (p[-1]);         \
  70     }                                           \
  71   while (0)
  72
  73 /* Get a 2 byte signed integer.  */
  74 #define COERCE16(x) ((int) (((x) ^ 0x8000) - 0x8000))
  75
  76 #define NEXTWORD(p, val, ret_val)               \
  77   do                                            \
  78     {                                           \
  79       p += 2;                                   \
  80       if (!FETCH_DATA (info, p))                \
  81         return ret_val;                         \
  82       val = COERCE16 ((p[-2] << 8) + p[-1]);    \
  83     }                                           \
  84   while (0)
  85
  86 /* Get a 4 byte signed integer.  */
  87 #define COERCE32(x) ((bfd_signed_vma) ((x) ^ 0x80000000) - 0x80000000)
  88
  89 #define NEXTLONG(p, val, ret_val)                                       \
  90   do                                                                    \
  91     {                                                                   \
  92       p += 4;                                                           \
  93       if (!FETCH_DATA (info, p))                                        \
  94         return ret_val;                                                 \
  95       val = COERCE32 ((((((p[-4] << 8) + p[-3]) << 8) + p[-2]) << 8) + p[-1]); \
  96     }                                                                   \
  97   while (0)
  98
  99 /* Get a 4 byte unsigned integer.  */
 100 #define NEXTULONG(p, val)                                               \
 101   do                                                                    \
 102     {                                                                   \
 103       p += 4;                                                           \
 104       if (!FETCH_DATA (info, p))                                        \
 105         return -3;                                                      \
 106       val = (unsigned int) ((((((p[-4] << 8) + p[-3]) << 8) + p[-2]) << 8) + p[-1]); \
 107     }                                                                   \
 108   while (0)
 109
 110 /* Get a single precision float.  */
 111 #define NEXTSINGLE(val, p)                                      \
 112   do                                                            \
 113     {                                                           \
 114       p += 4;                                                   \
 115       if (!FETCH_DATA (info, p))                                \
 116         return -3;                                              \
 117       floatformat_to_double (& floatformat_ieee_single_big,     \
 118                              (char *) p - 4, & val);            \
 119     }                                                           \
 120   while (0)
 121
 122 /* Get a double precision float.  */
 123 #define NEXTDOUBLE(val, p)                                      \
 124   do                                                            \
 125     {                                                           \
 126       p += 8;                                                   \
 127       if (!FETCH_DATA (info, p))                                \
 128         return -3;                                              \
 129       floatformat_to_double (& floatformat_ieee_double_big,     \
 130                              (char *) p - 8, & val);            \
 131     }                                                           \
 132   while (0)
 133
 134 /* Get an extended precision float.  */
 135 #define NEXTEXTEND(val, p)                              \
 136   do                                                    \
 137     {                                                   \
 138       p += 12;                                          \
 139       if (!FETCH_DATA (info, p))                        \
 140         return -3;                                      \
 141       floatformat_to_double (& floatformat_m68881_ext,  \
 142                              (char *) p - 12, & val);   \
 143     }                                                   \
 144   while (0)
 145
 146 /* Need a function to convert from packed to double
 147    precision.   Actually, it's easier to print a
 148    packed number than a double anyway, so maybe
 149    there should be a special case to handle this... */
 150 #define NEXTPACKED(p, val)                      \
 151   do                                            \
 152     {                                           \
 153       p += 12;                                  \
 154       if (!FETCH_DATA (info, p))                \
 155         return -3;                              \
 156       val = 0.0;                                \
 157     }                                           \
 158   while (0)
 159
 160 \f
 161 /* Maximum length of an instruction.  */
 162 #define MAXLEN 22
 163
 164 #include <setjmp.h>
 165
 166 struct private
 167 {
 168   /* Points to first byte not fetched.  */
 169   bfd_byte *max_fetched;
 170   bfd_byte the_buffer[MAXLEN];
 171   bfd_vma insn_start;
 172 };
 173
 174 /* Make sure that bytes from INFO->PRIVATE_DATA->BUFFER (inclusive)
 175    to ADDR (exclusive) are valid.  Returns 1 for success, 0 on error.  */
 176 #define FETCH_DATA(info, addr) \
 177   ((addr) <= ((struct private *) (info->private_data))->max_fetched \
 178    ? 1 : fetch_data ((info), (addr)))
 179
 180 static int
 181 fetch_data (struct disassemble_info *info, bfd_byte *addr)
 182 {
 183   int status;
 184   struct private *priv = (struct private *)info->private_data;
 185   bfd_vma start = priv->insn_start + (priv->max_fetched - priv->the_buffer);
 186
 187   status = (*info->read_memory_func) (start,
 188                                       priv->max_fetched,
 189                                       addr - priv->max_fetched,
 190                                       info);
 191   if (status != 0)
 192     {
 193       (*info->memory_error_func) (status, start, info);
 194       return 0;
 195     }
 196   else
 197     priv->max_fetched = addr;
 198   return 1;
 199 }
 200 \f
 201 /* This function is used to print to the bit-bucket.  */
 202 static int
 203 dummy_printer (FILE *file ATTRIBUTE_UNUSED,
 204                const char *format ATTRIBUTE_UNUSED,
 205                ...)
 206 {
 207   return 0;
 208 }
 209
 210 static void
 211 dummy_print_address (bfd_vma vma ATTRIBUTE_UNUSED,
 212                      struct disassemble_info *info ATTRIBUTE_UNUSED)
 213 {
 214 }
 215
 216 /* Fetch BITS bits from a position in the instruction specified by CODE.
 217    CODE is a "place to put an argument", or 'x' for a destination
 218    that is a general address (mode and register).
 219    BUFFER contains the instruction.
 220    Returns -1 on failure.  */
 221
 222 static int
 223 fetch_arg (unsigned char *buffer,
 224            int code,
 225            int bits,
 226            disassemble_info *info)
 227 {
 228   int val = 0;
 229
 230   switch (code)
 231     {
 232     case '/': /* MAC/EMAC mask bit.  */
 233       val = buffer[3] >> 5;
 234       break;
 235
 236     case 'G': /* EMAC ACC load.  */
 237       val = ((buffer[3] >> 3) & 0x2) | ((~buffer[1] >> 7) & 0x1);
 238       break;
 239
 240     case 'H': /* EMAC ACC !load.  */
 241       val = ((buffer[3] >> 3) & 0x2) | ((buffer[1] >> 7) & 0x1);
 242       break;
 243
 244     case ']': /* EMAC ACCEXT bit.  */
 245       val = buffer[0] >> 2;
 246       break;
 247
 248     case 'I': /* MAC/EMAC scale factor.  */
 249       val = buffer[2] >> 1;
 250       break;
 251
 252     case 'F': /* EMAC ACCx.  */
 253       val = buffer[0] >> 1;
 254       break;
 255
 256     case 'f':
 257       val = buffer[1];
 258       break;
 259
 260     case 's':
 261       val = buffer[1];
 262       break;
 263
 264     case 'd':                   /* Destination, for register or quick.  */
 265       val = (buffer[0] << 8) + buffer[1];
 266       val >>= 9;
 267       break;
 268
 269     case 'x':                   /* Destination, for general arg.  */
 270       val = (buffer[0] << 8) + buffer[1];
 271       val >>= 6;
 272       break;
 273
 274     case 'k':
 275       if (! FETCH_DATA (info, buffer + 3))
 276         return -1;
 277       val = (buffer[3] >> 4);
 278       break;
 279
 280     case 'C':
 281       if (! FETCH_DATA (info, buffer + 3))
 282         return -1;
 283       val = buffer[3];
 284       break;
 285
 286     case '1':
 287       if (! FETCH_DATA (info, buffer + 3))
 288         return -1;
 289       val = (buffer[2] << 8) + buffer[3];
 290       val >>= 12;
 291       break;
 292
 293     case '2':
 294       if (! FETCH_DATA (info, buffer + 3))
 295         return -1;
 296       val = (buffer[2] << 8) + buffer[3];
 297       val >>= 6;
 298       break;
 299
 300     case '3':
 301     case 'j':
 302       if (! FETCH_DATA (info, buffer + 3))
 303         return -1;
 304       val = (buffer[2] << 8) + buffer[3];
 305       break;
 306
 307     case '4':
 308       if (! FETCH_DATA (info, buffer + 5))
 309         return -1;
 310       val = (buffer[4] << 8) + buffer[5];
 311       val >>= 12;
 312       break;
 313
 314     case '5':
 315       if (! FETCH_DATA (info, buffer + 5))
 316         return -1;
 317       val = (buffer[4] << 8) + buffer[5];
 318       val >>= 6;
 319       break;
 320
 321     case '6':
 322       if (! FETCH_DATA (info, buffer + 5))
 323         return -1;
 324       val = (buffer[4] << 8) + buffer[5];
 325       break;
 326
 327     case '7':
 328       if (! FETCH_DATA (info, buffer + 3))
 329         return -1;
 330       val = (buffer[2] << 8) + buffer[3];
 331       val >>= 7;
 332       break;
 333
 334     case '8':
 335       if (! FETCH_DATA (info, buffer + 3))
 336         return -1;
 337       val = (buffer[2] << 8) + buffer[3];
 338       val >>= 10;
 339       break;
 340
 341     case '9':
 342       if (! FETCH_DATA (info, buffer + 3))
 343         return -1;
 344       val = (buffer[2] << 8) + buffer[3];
 345       val >>= 5;
 346       break;
 347
 348     case 'e':
 349       val = (buffer[1] >> 6);
 350       break;
 351
 352     case 'E':
 353       if (! FETCH_DATA (info, buffer + 3))
 354         return -1;
 355       val = (buffer[2] >> 1);
 356       break;
 357
 358     case 'm':
 359       val = (buffer[1] & 0x40 ? 0x8 : 0)
 360         | ((buffer[0] >> 1) & 0x7)
 361         | (buffer[3] & 0x80 ? 0x10 : 0);
 362       break;
 363
 364     case 'n':
 365       val = (buffer[1] & 0x40 ? 0x8 : 0) | ((buffer[0] >> 1) & 0x7);
 366       break;
 367
 368     case 'o':
 369       val = (buffer[2] >> 4) | (buffer[3] & 0x80 ? 0x10 : 0);
 370       break;
 371
 372     case 'M':
 373       val = (buffer[1] & 0xf) | (buffer[3] & 0x40 ? 0x10 : 0);
 374       break;
 375
 376     case 'N':
 377       val = (buffer[3] & 0xf) | (buffer[3] & 0x40 ? 0x10 : 0);
 378       break;
 379
 380     case 'h':
 381       val = buffer[2] >> 2;
 382       break;
 383
 384     default:
 385       abort ();
 386     }
 387
 388   /* bits is never too big.  */
 389   return val & ((1 << bits) - 1);
 390 }
 391
 392 /* Check if an EA is valid for a particular code.  This is required
 393    for the EMAC instructions since the type of source address determines
 394    if it is a EMAC-load instruciton if the EA is mode 2-5, otherwise it
 395    is a non-load EMAC instruction and the bits mean register Ry.
 396    A similar case exists for the movem instructions where the register
 397    mask is interpreted differently for different EAs.  */
 398
 399 static bfd_boolean
 400 m68k_valid_ea (char code, int val)
 401 {
 402   int mode, mask;
 403 #define M(n0,n1,n2,n3,n4,n5,n6,n70,n71,n72,n73,n74) \
 404   (n0 | n1 << 1 | n2 << 2 | n3 << 3 | n4 << 4 | n5 << 5 | n6 << 6 \
 405    | n70 << 7 | n71 << 8 | n72 << 9 | n73 << 10 | n74 << 11)
 406
 407   switch (code)
 408     {
 409     case '*':
 410       mask = M (1,1,1,1,1,1,1,1,1,1,1,1);
 411       break;
 412     case '~':
 413       mask = M (0,0,1,1,1,1,1,1,1,0,0,0);
 414       break;
 415     case '%':
 416       mask = M (1,1,1,1,1,1,1,1,1,0,0,0);
 417       break;
 418     case ';':
 419       mask = M (1,0,1,1,1,1,1,1,1,1,1,1);
 420       break;
 421     case '@':
 422       mask = M (1,0,1,1,1,1,1,1,1,1,1,0);
 423       break;
 424     case '!':
 425       mask = M (0,0,1,0,0,1,1,1,1,1,1,0);
 426       break;
 427     case '&':
 428       mask = M (0,0,1,0,0,1,1,1,1,0,0,0);
 429       break;
 430     case '$':
 431       mask = M (1,0,1,1,1,1,1,1,1,0,0,0);
 432       break;
 433     case '?':
 434       mask = M (1,0,1,0,0,1,1,1,1,0,0,0);
 435       break;
 436     case '/':
 437       mask = M (1,0,1,0,0,1,1,1,1,1,1,0);
 438       break;
 439     case '|':
 440       mask = M (0,0,1,0,0,1,1,1,1,1,1,0);
 441       break;
 442     case '>':
 443       mask = M (0,0,1,0,1,1,1,1,1,0,0,0);
 444       break;
 445     case '<':
 446       mask = M (0,0,1,1,0,1,1,1,1,1,1,0);
 447       break;
 448     case 'm':
 449       mask = M (1,1,1,1,1,0,0,0,0,0,0,0);
 450       break;
 451     case 'n':
 452       mask = M (0,0,0,0,0,1,0,0,0,1,0,0);
 453       break;
 454     case 'o':
 455       mask = M (0,0,0,0,0,0,1,1,1,0,1,1);
 456       break;
 457     case 'p':
 458       mask = M (1,1,1,1,1,1,0,0,0,0,0,0);
 459       break;
 460     case 'q':
 461       mask = M (1,0,1,1,1,1,0,0,0,0,0,0);
 462       break;
 463     case 'v':
 464       mask = M (1,0,1,1,1,1,0,1,1,0,0,0);
 465       break;
 466     case 'b':
 467       mask = M (1,0,1,1,1,1,0,0,0,1,0,0);
 468       break;
 469     case 'w':
 470       mask = M (0,0,1,1,1,1,0,0,0,1,0,0);
 471       break;
 472     case 'y':
 473       mask = M (0,0,1,0,0,1,0,0,0,0,0,0);
 474       break;
 475     case 'z':
 476       mask = M (0,0,1,0,0,1,0,0,0,1,0,0);
 477       break;
 478     case '4':
 479       mask = M (0,0,1,1,1,1,0,0,0,0,0,0);
 480       break;
 481     default:
 482       abort ();
 483     }
 484 #undef M
 485
 486   mode = (val >> 3) & 7;
 487   if (mode == 7)
 488     mode += val & 7;
 489   return (mask & (1 << mode)) != 0;
 490 }
 491
 492 /* Print a base register REGNO and displacement DISP, on INFO->STREAM.
 493    REGNO = -1 for pc, -2 for none (suppressed).  */
 494
 495 static void
 496 print_base (int regno, bfd_vma disp, disassemble_info *info)
 497 {
 498   if (regno == -1)
 499     {
 500       (*info->fprintf_func) (info->stream, "%%pc@(");
 501       (*info->print_address_func) (disp, info);
 502     }
 503   else
 504     {
 505       char buf[50];
 506
 507       if (regno == -2)
 508         (*info->fprintf_func) (info->stream, "@(");
 509       else if (regno == -3)
 510         (*info->fprintf_func) (info->stream, "%%zpc@(");
 511       else
 512         (*info->fprintf_func) (info->stream, "%s@(", reg_names[regno]);
 513
 514       sprintf_vma (buf, disp);
 515       (*info->fprintf_func) (info->stream, "%s", buf);
 516     }
 517 }
 518
 519 /* Print an indexed argument.  The base register is BASEREG (-1 for pc).
 520    P points to extension word, in buffer.
 521    ADDR is the nominal core address of that extension word.
 522    Returns NULL upon error.  */
 523
 524 static unsigned char *
 525 print_indexed (int basereg,
 526                unsigned char *p,
 527                bfd_vma addr,
 528                disassemble_info *info)
 529 {
 530   int word;
 531   static char *const scales[] = { "", ":2", ":4", ":8" };
 532   bfd_vma base_disp;
 533   bfd_vma outer_disp;
 534   char buf[40];
 535   char vmabuf[50];
 536
 537   NEXTWORD (p, word, NULL);
 538
 539   /* Generate the text for the index register.
 540      Where this will be output is not yet determined.  */
 541   sprintf (buf, "%s:%c%s",
 542            reg_names[(word >> 12) & 0xf],
 543            (word & 0x800) ? 'l' : 'w',
 544            scales[(word >> 9) & 3]);
 545
 546   /* Handle the 68000 style of indexing.  */
 547
 548   if ((word & 0x100) == 0)
 549     {
 550       base_disp = word & 0xff;
 551       if ((base_disp & 0x80) != 0)
 552         base_disp -= 0x100;
 553       if (basereg == -1)
 554         base_disp += addr;
 555       print_base (basereg, base_disp, info);
 556       (*info->fprintf_func) (info->stream, ",%s)", buf);
 557       return p;
 558     }
 559
 560   /* Handle the generalized kind.  */
 561   /* First, compute the displacement to add to the base register.  */
 562   if (word & 0200)
 563     {
 564       if (basereg == -1)
 565         basereg = -3;
 566       else
 567         basereg = -2;
 568     }
 569   if (word & 0100)
 570     buf[0] = '\0';
 571   base_disp = 0;
 572   switch ((word >> 4) & 3)
 573     {
 574     case 2:
 575       NEXTWORD (p, base_disp, NULL);
 576       break;
 577     case 3:
 578       NEXTLONG (p, base_disp, NULL);
 579     }
 580   if (basereg == -1)
 581     base_disp += addr;
 582
 583   /* Handle single-level case (not indirect).  */
 584   if ((word & 7) == 0)
 585     {
 586       print_base (basereg, base_disp, info);
 587       if (buf[0] != '\0')
 588         (*info->fprintf_func) (info->stream, ",%s", buf);
 589       (*info->fprintf_func) (info->stream, ")");
 590       return p;
 591     }
 592
 593   /* Two level.  Compute displacement to add after indirection.  */
 594   outer_disp = 0;
 595   switch (word & 3)
 596     {
 597     case 2:
 598       NEXTWORD (p, outer_disp, NULL);
 599       break;
 600     case 3:
 601       NEXTLONG (p, outer_disp, NULL);
 602     }
 603
 604   print_base (basereg, base_disp, info);
 605   if ((word & 4) == 0 && buf[0] != '\0')
 606     {
 607       (*info->fprintf_func) (info->stream, ",%s", buf);
 608       buf[0] = '\0';
 609     }
 610   sprintf_vma (vmabuf, outer_disp);
 611   (*info->fprintf_func) (info->stream, ")@(%s", vmabuf);
 612   if (buf[0] != '\0')
 613     (*info->fprintf_func) (info->stream, ",%s", buf);
 614   (*info->fprintf_func) (info->stream, ")");
 615
 616   return p;
 617 }
 618
 619 #define FETCH_ARG(size, val)                            \
 620   do                                                    \
 621     {                                                   \
 622       val = fetch_arg (buffer, place, size, info);      \
 623       if (val < 0)                                      \
 624         return -3;                                      \
 625     }                                                   \
 626   while (0)
 627
 628 /* Returns number of bytes "eaten" by the operand, or
 629    return -1 if an invalid operand was found, or -2 if
 630    an opcode tabe error was found or -3 to simply abort.
 631    ADDR is the pc for this arg to be relative to.  */
 632
 633 static int
 634 print_insn_arg (const char *d,
 635                 unsigned char *buffer,
 636                 unsigned char *p0,
 637                 bfd_vma addr,
 638                 disassemble_info *info)
 639 {
 640   int val = 0;
 641   int place = d[1];
 642   unsigned char *p = p0;
 643   int regno;
 644   const char *regname;
 645   unsigned char *p1;
 646   double flval;
 647   int flt_p;
 648   bfd_signed_vma disp;
 649   unsigned int uval;
 650
 651   switch (*d)
 652     {
 653     case 'c':           /* Cache identifier.  */
 654       {
 655         static char *const cacheFieldName[] = { "nc", "dc", "ic", "bc" };
 656         FETCH_ARG (2, val);
 657         (*info->fprintf_func) (info->stream, cacheFieldName[val]);
 658         break;
 659       }
 660
 661     case 'a':           /* Address register indirect only. Cf. case '+'.  */
 662       {
 663         FETCH_ARG (3, val);
 664         (*info->fprintf_func) (info->stream, "%s@", reg_names[val + 8]);
 665         break;
 666       }
 667
 668     case '_':           /* 32-bit absolute address for move16.  */
 669       {
 670         NEXTULONG (p, uval);
 671         (*info->print_address_func) (uval, info);
 672         break;
 673       }
 674
 675     case 'C':
 676       (*info->fprintf_func) (info->stream, "%%ccr");
 677       break;
 678
 679     case 'S':
 680       (*info->fprintf_func) (info->stream, "%%sr");
 681       break;
 682
 683     case 'U':
 684       (*info->fprintf_func) (info->stream, "%%usp");
 685       break;
 686
 687     case 'E':
 688       (*info->fprintf_func) (info->stream, "%%acc");
 689       break;
 690
 691     case 'G':
 692       (*info->fprintf_func) (info->stream, "%%macsr");
 693       break;
 694
 695     case 'H':
 696       (*info->fprintf_func) (info->stream, "%%mask");
 697       break;
 698
 699     case 'J':
 700       {
 701         /* FIXME: There's a problem here, different m68k processors call the
 702            same address different names.  The tables below try to get it right
 703            using info->mach, but only for v4e.  */
 704         struct regname { char * name; int value; };
 705         static const struct regname names[] =
 706           {
 707             {"%sfc", 0x000}, {"%dfc", 0x001}, {"%cacr", 0x002},
 708             {"%tc",  0x003}, {"%itt0",0x004}, {"%itt1", 0x005},
 709             {"%dtt0",0x006}, {"%dtt1",0x007}, {"%buscr",0x008},
 710             {"%rgpiobar", 0x009}, {"%acr4",0x00c},
 711             {"%acr5",0x00d}, {"%acr6",0x00e}, {"%acr7", 0x00f},
 712             {"%usp", 0x800}, {"%vbr", 0x801}, {"%caar", 0x802},
 713             {"%msp", 0x803}, {"%isp", 0x804},
 714             {"%pc", 0x80f},
 715             /* Reg c04 is sometimes called flashbar or rambar.
 716                Reg c05 is also sometimes called rambar.  */
 717             {"%rambar0", 0xc04}, {"%rambar1", 0xc05},
 718
 719             /* reg c0e is sometimes called mbar2 or secmbar.
 720                reg c0f is sometimes called mbar.  */
 721             {"%mbar0", 0xc0e}, {"%mbar1", 0xc0f},
 722
 723             /* Should we be calling this psr like we do in case 'Y'?  */
 724             {"%mmusr",0x805},
 725
 726             {"%urp", 0x806}, {"%srp", 0x807}, {"%pcr", 0x808},
 727
 728             /* Fido added these.  */
 729             {"%cac", 0xffe}, {"%mbo", 0xfff}
 730         };
 731         /* Alternate names for v4e (MCF5407/5445x/MCF547x/MCF548x), at least.  */
 732         static const struct regname names_v4e[] =
 733           {
 734             {"%asid",0x003}, {"%acr0",0x004}, {"%acr1",0x005},
 735             {"%acr2",0x006}, {"%acr3",0x007}, {"%mmubar",0x008},
 736           };
 737         unsigned int arch_mask;
 738
 739         arch_mask = bfd_m68k_mach_to_features (info->mach);
 740         FETCH_ARG (12, val);
 741         if (arch_mask & (mcfisa_b | mcfisa_c))
 742           {
 743             for (regno = ARRAY_SIZE (names_v4e); --regno >= 0;)
 744               if (names_v4e[regno].value == val)
 745                 {
 746                   (*info->fprintf_func) (info->stream, "%s", names_v4e[regno].name);
 747                   break;
 748                 }
 749             if (regno >= 0)
 750               break;
 751           }
 752         for (regno = ARRAY_SIZE (names) - 1; regno >= 0; regno--)
 753           if (names[regno].value == val)
 754             {
 755               (*info->fprintf_func) (info->stream, "%s", names[regno].name);
 756               break;
 757             }
 758         if (regno < 0)
 759           (*info->fprintf_func) (info->stream, "0x%x", val);
 760       }
 761       break;
 762
 763     case 'Q':
 764       FETCH_ARG (3, val);
 765       /* 0 means 8, except for the bkpt instruction... */
 766       if (val == 0 && d[1] != 's')
 767         val = 8;
 768       (*info->fprintf_func) (info->stream, "#%d", val);
 769       break;
 770
 771     case 'x':
 772       FETCH_ARG (3, val);
 773       /* 0 means -1.  */
 774       if (val == 0)
 775         val = -1;
 776       (*info->fprintf_func) (info->stream, "#%d", val);
 777       break;
 778
 779     case 'j':
 780       FETCH_ARG (3, val);
 781       (*info->fprintf_func) (info->stream, "#%d", val+1);
 782       break;
 783
 784     case 'K':
 785       FETCH_ARG (9, val);
 786       (*info->fprintf_func) (info->stream, "#%d", val);
 787       break;
 788
 789     case 'M':
 790       if (place == 'h')
 791         {
 792           static char *const scalefactor_name[] = { "<<", ">>" };
 793
 794           FETCH_ARG (1, val);
 795           (*info->fprintf_func) (info->stream, scalefactor_name[val]);
 796         }
 797       else
 798         {
 799           FETCH_ARG (8, val);
 800           if (val & 0x80)
 801             val = val - 0x100;
 802           (*info->fprintf_func) (info->stream, "#%d", val);
 803         }
 804       break;
 805
 806     case 'T':
 807       FETCH_ARG (4, val);
 808       (*info->fprintf_func) (info->stream, "#%d", val);
 809       break;
 810
 811     case 'D':
 812       FETCH_ARG (3, val);
 813       (*info->fprintf_func) (info->stream, "%s", reg_names[val]);
 814       break;
 815
 816     case 'A':
 817       FETCH_ARG (3, val);
 818       (*info->fprintf_func) (info->stream, "%s", reg_names[val + 010]);
 819       break;
 820
 821     case 'R':
 822       FETCH_ARG (4, val);
 823       (*info->fprintf_func) (info->stream, "%s", reg_names[val]);
 824       break;
 825
 826     case 'r':
 827       FETCH_ARG (4, regno);
 828       if (regno > 7)
 829         (*info->fprintf_func) (info->stream, "%s@", reg_names[regno]);
 830       else
 831         (*info->fprintf_func) (info->stream, "@(%s)", reg_names[regno]);
 832       break;
 833
 834     case 'F':
 835       FETCH_ARG (3, val);
 836       (*info->fprintf_func) (info->stream, "%%fp%d", val);
 837       break;
 838
 839     case 'O':
 840       FETCH_ARG (6, val);
 841       if (val & 0x20)
 842         (*info->fprintf_func) (info->stream, "%s", reg_names[val & 7]);
 843       else
 844         (*info->fprintf_func) (info->stream, "%d", val);
 845       break;
 846
 847     case '+':
 848       FETCH_ARG (3, val);
 849       (*info->fprintf_func) (info->stream, "%s@+", reg_names[val + 8]);
 850       break;
 851
 852     case '-':
 853       FETCH_ARG (3, val);
 854       (*info->fprintf_func) (info->stream, "%s@-", reg_names[val + 8]);
 855       break;
 856
 857     case 'k':
 858       if (place == 'k')
 859         {
 860           FETCH_ARG (3, val);
 861           (*info->fprintf_func) (info->stream, "{%s}", reg_names[val]);
 862         }
 863       else if (place == 'C')
 864         {
 865           FETCH_ARG (7, val);
 866           if (val > 63)         /* This is a signed constant.  */
 867             val -= 128;
 868           (*info->fprintf_func) (info->stream, "{#%d}", val);
 869         }
 870       else
 871         return -1;
 872       break;
 873
 874     case '#':
 875     case '^':
 876       p1 = buffer + (*d == '#' ? 2 : 4);
 877       if (place == 's')
 878         FETCH_ARG (4, val);
 879       else if (place == 'C')
 880         FETCH_ARG (7, val);
 881       else if (place == '8')
 882         FETCH_ARG (3, val);
 883       else if (place == '3')
 884         FETCH_ARG (8, val);
 885       else if (place == 'b')
 886         NEXTBYTE (p1, val);
 887       else if (place == 'w' || place == 'W')
 888         NEXTWORD (p1, val, -3);
 889       else if (place == 'l')
 890         NEXTLONG (p1, val, -3);
 891       else
 892         return -2;
 893
 894       (*info->fprintf_func) (info->stream, "#%d", val);
 895       break;
 896
 897     case 'B':
 898       if (place == 'b')
 899         NEXTBYTE (p, disp);
 900       else if (place == 'B')
 901         disp = COERCE_SIGNED_CHAR (buffer[1]);
 902       else if (place == 'w' || place == 'W')
 903         NEXTWORD (p, disp, -3);
 904       else if (place == 'l' || place == 'L' || place == 'C')
 905         NEXTLONG (p, disp, -3);
 906       else if (place == 'g')
 907         {
 908           NEXTBYTE (buffer, disp);
 909           if (disp == 0)
 910             NEXTWORD (p, disp, -3);
 911           else if (disp == -1)
 912             NEXTLONG (p, disp, -3);
 913         }
 914       else if (place == 'c')
 915         {
 916           if (buffer[1] & 0x40)         /* If bit six is one, long offset.  */
 917             NEXTLONG (p, disp, -3);
 918           else
 919             NEXTWORD (p, disp, -3);
 920         }
 921       else
 922         return -2;
 923
 924       (*info->print_address_func) (addr + disp, info);
 925       break;
 926
 927     case 'd':
 928       {
 929         int val1;
 930
 931         NEXTWORD (p, val, -3);
 932         FETCH_ARG (3, val1);
 933         (*info->fprintf_func) (info->stream, "%s@(%d)", reg_names[val1 + 8], val);
 934         break;
 935       }
 936
 937     case 's':
 938       FETCH_ARG (3, val);
 939       (*info->fprintf_func) (info->stream, "%s", fpcr_names[val]);
 940       break;
 941
 942     case 'e':
 943       FETCH_ARG (2, val);
 944       (*info->fprintf_func) (info->stream, "%%acc%d", val);
 945       break;
 946
 947     case 'g':
 948       FETCH_ARG (1, val);
 949       (*info->fprintf_func) (info->stream, "%%accext%s", val == 0 ? "01" : "23");
 950       break;
 951
 952     case 'i':
 953       FETCH_ARG (2, val);
 954       if (val == 1)
 955         (*info->fprintf_func) (info->stream, "<<");
 956       else if (val == 3)
 957         (*info->fprintf_func) (info->stream, ">>");
 958       else
 959         return -1;
 960       break;
 961
 962     case 'I':
 963       /* Get coprocessor ID... */
 964       val = fetch_arg (buffer, 'd', 3, info);
 965       if (val < 0)
 966         return -3;
 967       if (val != 1)                             /* Unusual coprocessor ID?  */
 968         (*info->fprintf_func) (info->stream, "(cpid=%d) ", val);
 969       break;
 970
 971     case '4':
 972     case '*':
 973     case '~':
 974     case '%':
 975     case ';':
 976     case '@':
 977     case '!':
 978     case '$':
 979     case '?':
 980     case '/':
 981     case '&':
 982     case '|':
 983     case '<':
 984     case '>':
 985     case 'm':
 986     case 'n':
 987     case 'o':
 988     case 'p':
 989     case 'q':
 990     case 'v':
 991     case 'b':
 992     case 'w':
 993     case 'y':
 994     case 'z':
 995       if (place == 'd')
 996         {
 997           val = fetch_arg (buffer, 'x', 6, info);
 998           if (val < 0)
 999             return -3;
1000           val = ((val & 7) << 3) + ((val >> 3) & 7);
1001         }
1002       else
1003         {
1004           val = fetch_arg (buffer, 's', 6, info);
1005           if (val < 0)
1006             return -3;
1007         }
1008
1009       /* If the <ea> is invalid for *d, then reject this match.  */
1010       if (!m68k_valid_ea (*d, val))
1011         return -1;
1012
1013       /* Get register number assuming address register.  */
1014       regno = (val & 7) + 8;
1015       regname = reg_names[regno];
1016       switch (val >> 3)
1017         {
1018         case 0:
1019           (*info->fprintf_func) (info->stream, "%s", reg_names[val]);
1020           break;
1021
1022         case 1:
1023           (*info->fprintf_func) (info->stream, "%s", regname);
1024           break;
1025
1026         case 2:
1027           (*info->fprintf_func) (info->stream, "%s@", regname);
1028           break;
1029
1030         case 3:
1031           (*info->fprintf_func) (info->stream, "%s@+", regname);
1032           break;
1033
1034         case 4:
1035           (*info->fprintf_func) (info->stream, "%s@-", regname);
1036           break;
1037
1038         case 5:
1039           NEXTWORD (p, val, -3);
1040           (*info->fprintf_func) (info->stream, "%s@(%d)", regname, val);
1041           break;
1042
1043         case 6:
1044           p = print_indexed (regno, p, addr, info);
1045           if (p == NULL)
1046             return -3;
1047           break;
1048
1049         case 7:
1050           switch (val & 7)
1051             {
1052             case 0:
1053               NEXTWORD (p, val, -3);
1054               (*info->print_address_func) (val, info);
1055               break;
1056
1057             case 1:
1058               NEXTULONG (p, uval);
1059               (*info->print_address_func) (uval, info);
1060               break;
1061
1062             case 2:
1063               NEXTWORD (p, val, -3);
1064               (*info->fprintf_func) (info->stream, "%%pc@(");
1065               (*info->print_address_func) (addr + val, info);
1066               (*info->fprintf_func) (info->stream, ")");
1067               break;
1068
1069             case 3:
1070               p = print_indexed (-1, p, addr, info);
1071               if (p == NULL)
1072                 return -3;
1073               break;
1074
1075             case 4:
1076               flt_p = 1;        /* Assume it's a float... */
1077               switch (place)
1078               {
1079                 case 'b':
1080                   NEXTBYTE (p, val);
1081                   flt_p = 0;
1082                   break;
1083
1084                 case 'w':
1085                   NEXTWORD (p, val, -3);
1086                   flt_p = 0;
1087                   break;
1088
1089                 case 'l':
1090                   NEXTLONG (p, val, -3);
1091                   flt_p = 0;
1092                   break;
1093
1094                 case 'f':
1095                   NEXTSINGLE (flval, p);
1096                   break;
1097
1098                 case 'F':
1099                   NEXTDOUBLE (flval, p);
1100                   break;
1101
1102                 case 'x':
1103                   NEXTEXTEND (flval, p);
1104                   break;
1105
1106                 case 'p':
1107                   NEXTPACKED (p, flval);
1108                   break;
1109
1110                 default:
1111                   return -1;
1112               }
1113               if (flt_p)        /* Print a float? */
1114                 (*info->fprintf_func) (info->stream, "#%g", flval);
1115               else
1116                 (*info->fprintf_func) (info->stream, "#%d", val);
1117               break;
1118
1119             default:
1120               return -1;
1121             }
1122         }
1123
1124       /* If place is '/', then this is the case of the mask bit for
1125          mac/emac loads. Now that the arg has been printed, grab the
1126          mask bit and if set, add a '&' to the arg.  */
1127       if (place == '/')
1128         {
1129           FETCH_ARG (1, val);
1130           if (val)
1131             info->fprintf_func (info->stream, "&");
1132         }
1133       break;
1134
1135     case 'L':
1136     case 'l':
1137         if (place == 'w')
1138           {
1139             char doneany;
1140             p1 = buffer + 2;
1141             NEXTWORD (p1, val, -3);
1142             /* Move the pointer ahead if this point is farther ahead
1143                than the last.  */
1144             p = p1 > p ? p1 : p;
1145             if (val == 0)
1146               {
1147                 (*info->fprintf_func) (info->stream, "#0");
1148                 break;
1149               }
1150             if (*d == 'l')
1151               {
1152                 int newval = 0;
1153
1154                 for (regno = 0; regno < 16; ++regno)
1155                   if (val & (0x8000 >> regno))
1156                     newval |= 1 << regno;
1157                 val = newval;
1158               }
1159             val &= 0xffff;
1160             doneany = 0;
1161             for (regno = 0; regno < 16; ++regno)
1162               if (val & (1 << regno))
1163                 {
1164                   int first_regno;
1165
1166                   if (doneany)
1167                     (*info->fprintf_func) (info->stream, "/");
1168                   doneany = 1;
1169                   (*info->fprintf_func) (info->stream, "%s", reg_names[regno]);
1170                   first_regno = regno;
1171                   while (val & (1 << (regno + 1)))
1172                     ++regno;
1173                   if (regno > first_regno)
1174                     (*info->fprintf_func) (info->stream, "-%s",
1175                                            reg_names[regno]);
1176                 }
1177           }
1178         else if (place == '3')
1179           {
1180             /* `fmovem' insn.  */
1181             char doneany;
1182
1183             FETCH_ARG (8, val);
1184             if (val == 0)
1185               {
1186                 (*info->fprintf_func) (info->stream, "#0");
1187                 break;
1188               }
1189             if (*d == 'l')
1190               {
1191                 int newval = 0;
1192
1193                 for (regno = 0; regno < 8; ++regno)
1194                   if (val & (0x80 >> regno))
1195                     newval |= 1 << regno;
1196                 val = newval;
1197               }
1198             val &= 0xff;
1199             doneany = 0;
1200             for (regno = 0; regno < 8; ++regno)
1201               if (val & (1 << regno))
1202                 {
1203                   int first_regno;
1204                   if (doneany)
1205                     (*info->fprintf_func) (info->stream, "/");
1206                   doneany = 1;
1207                   (*info->fprintf_func) (info->stream, "%%fp%d", regno);
1208                   first_regno = regno;
1209                   while (val & (1 << (regno + 1)))
1210                     ++regno;
1211                   if (regno > first_regno)
1212                     (*info->fprintf_func) (info->stream, "-%%fp%d", regno);
1213                 }
1214           }
1215         else if (place == '8')
1216           {
1217             FETCH_ARG (3, val);
1218             /* fmoveml for FP status registers.  */
1219             (*info->fprintf_func) (info->stream, "%s", fpcr_names[val]);
1220           }
1221         else
1222           return -2;
1223       break;
1224
1225     case 'X':
1226       place = '8';
1227     case 'Y':
1228     case 'Z':
1229     case 'W':
1230     case '0':
1231     case '1':
1232     case '2':
1233     case '3':
1234       {
1235         char *name = 0;
1236
1237         FETCH_ARG (5, val);
1238         switch (val)
1239           {
1240           case 2: name = "%tt0"; break;
1241           case 3: name = "%tt1"; break;
1242           case 0x10: name = "%tc"; break;
1243           case 0x11: name = "%drp"; break;
1244           case 0x12: name = "%srp"; break;
1245           case 0x13: name = "%crp"; break;
1246           case 0x14: name = "%cal"; break;
1247           case 0x15: name = "%val"; break;
1248           case 0x16: name = "%scc"; break;
1249           case 0x17: name = "%ac"; break;
1250           case 0x18: name = "%psr"; break;
1251           case 0x19: name = "%pcsr"; break;
1252           case 0x1c:
1253           case 0x1d:
1254             {
1255               int break_reg = ((buffer[3] >> 2) & 7);
1256
1257               (*info->fprintf_func)
1258                 (info->stream, val == 0x1c ? "%%bad%d" : "%%bac%d",
1259                  break_reg);
1260             }
1261             break;
1262           default:
1263             (*info->fprintf_func) (info->stream, "<mmu register %d>", val);
1264           }
1265         if (name)
1266           (*info->fprintf_func) (info->stream, "%s", name);
1267       }
1268       break;
1269
1270     case 'f':
1271       {
1272         int fc;
1273
1274         FETCH_ARG (5, fc);
1275         if (fc == 1)
1276           (*info->fprintf_func) (info->stream, "%%dfc");
1277         else if (fc == 0)
1278           (*info->fprintf_func) (info->stream, "%%sfc");
1279         else
1280           /* xgettext:c-format */
1281           (*info->fprintf_func) (info->stream, _("<function code %d>"), fc);
1282       }
1283       break;
1284
1285     case 'V':
1286       (*info->fprintf_func) (info->stream, "%%val");
1287       break;
1288
1289     case 't':
1290       {
1291         int level;
1292
1293         FETCH_ARG (3, level);
1294         (*info->fprintf_func) (info->stream, "%d", level);
1295       }
1296       break;
1297
1298     case 'u':
1299       {
1300         short is_upper = 0;
1301         int reg;
1302
1303         FETCH_ARG (5, reg);
1304         if (reg & 0x10)
1305           {
1306             is_upper = 1;
1307             reg &= 0xf;
1308           }
1309         (*info->fprintf_func) (info->stream, "%s%s",
1310                                reg_half_names[reg],
1311                                is_upper ? "u" : "l");
1312       }
1313       break;
1314
1315     default:
1316       return -2;
1317     }
1318
1319   return p - p0;
1320 }
1321
1322 /* Try to match the current instruction to best and if so, return the
1323    number of bytes consumed from the instruction stream, else zero.  */
1324
1325 static int
1326 match_insn_m68k (bfd_vma memaddr,
1327                  disassemble_info * info,
1328                  const struct m68k_opcode * best)
1329 {
1330   unsigned char *save_p;
1331   unsigned char *p;
1332   const char *d;
1333   const char *args = best->args;
1334
1335   struct private *priv = (struct private *) info->private_data;
1336   bfd_byte *buffer = priv->the_buffer;
1337   fprintf_ftype save_printer = info->fprintf_func;
1338   void (* save_print_address) (bfd_vma, struct disassemble_info *)
1339     = info->print_address_func;
1340
1341   if (*args == '.')
1342     args++;
1343
1344   /* Point at first word of argument data,
1345      and at descriptor for first argument.  */
1346   p = buffer + 2;
1347
1348   /* Figure out how long the fixed-size portion of the instruction is.
1349      The only place this is stored in the opcode table is
1350      in the arguments--look for arguments which specify fields in the 2nd
1351      or 3rd words of the instruction.  */
1352   for (d = args; *d; d += 2)
1353     {
1354       /* I don't think it is necessary to be checking d[0] here;
1355          I suspect all this could be moved to the case statement below.  */
1356       if (d[0] == '#')
1357         {
1358           if (d[1] == 'l' && p - buffer < 6)
1359             p = buffer + 6;
1360           else if (p - buffer < 4 && d[1] != 'C' && d[1] != '8')
1361             p = buffer + 4;
1362         }
1363
1364       if ((d[0] == 'L' || d[0] == 'l') && d[1] == 'w' && p - buffer < 4)
1365         p = buffer + 4;
1366
1367       switch (d[1])
1368         {
1369         case '1':
1370         case '2':
1371         case '3':
1372         case '7':
1373         case '8':
1374         case '9':
1375         case 'i':
1376           if (p - buffer < 4)
1377             p = buffer + 4;
1378           break;
1379         case '4':
1380         case '5':
1381         case '6':
1382           if (p - buffer < 6)
1383             p = buffer + 6;
1384           break;
1385         default:
1386           break;
1387         }
1388     }
1389
1390   /* pflusha is an exceptions.  It takes no arguments but is two words
1391      long.  Recognize it by looking at the lower 16 bits of the mask.  */
1392   if (p - buffer < 4 && (best->match & 0xFFFF) != 0)
1393     p = buffer + 4;
1394
1395   /* lpstop is another exception.  It takes a one word argument but is
1396      three words long.  */
1397   if (p - buffer < 6
1398       && (best->match & 0xffff) == 0xffff
1399       && args[0] == '#'
1400       && args[1] == 'w')
1401     {
1402       /* Copy the one word argument into the usual location for a one
1403          word argument, to simplify printing it.  We can get away with
1404          this because we know exactly what the second word is, and we
1405          aren't going to print anything based on it.  */
1406       p = buffer + 6;
1407       FETCH_DATA (info, p);
1408       buffer[2] = buffer[4];
1409       buffer[3] = buffer[5];
1410     }
1411
1412   FETCH_DATA (info, p);
1413
1414   save_p = p;
1415   info->print_address_func = dummy_print_address;
1416   info->fprintf_func = (fprintf_ftype) dummy_printer;
1417
1418   /* We scan the operands twice.  The first time we don't print anything,
1419      but look for errors.  */
1420   for (d = args; *d; d += 2)
1421     {
1422       int eaten = print_insn_arg (d, buffer, p, memaddr + (p - buffer), info);
1423
1424       if (eaten >= 0)
1425         p += eaten;
1426       else if (eaten == -1 || eaten == -3)
1427         {
1428           info->fprintf_func = save_printer;
1429           info->print_address_func = save_print_address;
1430           return 0;
1431         }
1432       else
1433         {
1434           /* We must restore the print functions before trying to print the
1435              error message.  */
1436           info->fprintf_func = save_printer;
1437           info->print_address_func = save_print_address;
1438           info->fprintf_func (info->stream,
1439                               /* xgettext:c-format */
1440                               _("<internal error in opcode table: %s %s>\n"),
1441                               best->name, best->args);
1442           return 2;
1443         }
1444     }
1445
1446   p = save_p;
1447   info->fprintf_func = save_printer;
1448   info->print_address_func = save_print_address;
1449
1450   d = args;
1451
1452   info->fprintf_func (info->stream, "%s", best->name);
1453
1454   if (*d)
1455     info->fprintf_func (info->stream, " ");
1456
1457   while (*d)
1458     {
1459       p += print_insn_arg (d, buffer, p, memaddr + (p - buffer), info);
1460       d += 2;
1461
1462       if (*d && *(d - 2) != 'I' && *d != 'k')
1463         info->fprintf_func (info->stream, ",");
1464     }
1465
1466   return p - buffer;
1467 }
1468
1469 /* Try to interpret the instruction at address MEMADDR as one that
1470    can execute on a processor with the features given by ARCH_MASK.
1471    If successful, print the instruction to INFO->STREAM and return
1472    its length in bytes.  Return 0 otherwise.  */
1473
1474 static int
1475 m68k_scan_mask (bfd_vma memaddr, disassemble_info *info,
1476                 unsigned int arch_mask)
1477 {
1478   int i;
1479   const char *d;
1480   static const struct m68k_opcode **opcodes[16];
1481   static int numopcodes[16];
1482   int val;
1483   int major_opcode;
1484
1485   struct private *priv = (struct private *) info->private_data;
1486   bfd_byte *buffer = priv->the_buffer;
1487
1488   if (!opcodes[0])
1489     {
1490       /* Speed up the matching by sorting the opcode
1491          table on the upper four bits of the opcode.  */
1492       const struct m68k_opcode **opc_pointer[16];
1493
1494       /* First count how many opcodes are in each of the sixteen buckets.  */
1495       for (i = 0; i < m68k_numopcodes; i++)
1496         numopcodes[(m68k_opcodes[i].opcode >> 28) & 15]++;
1497
1498       /* Then create a sorted table of pointers
1499          that point into the unsorted table.  */
1500       opc_pointer[0] = xmalloc (sizeof (struct m68k_opcode *)
1501                                 * m68k_numopcodes);
1502       opcodes[0] = opc_pointer[0];
1503
1504       for (i = 1; i < 16; i++)
1505         {
1506           opc_pointer[i] = opc_pointer[i - 1] + numopcodes[i - 1];
1507           opcodes[i] = opc_pointer[i];
1508         }
1509
1510       for (i = 0; i < m68k_numopcodes; i++)
1511         *opc_pointer[(m68k_opcodes[i].opcode >> 28) & 15]++ = &m68k_opcodes[i];
1512     }
1513
1514   FETCH_DATA (info, buffer + 2);
1515   major_opcode = (buffer[0] >> 4) & 15;
1516
1517   for (i = 0; i < numopcodes[major_opcode]; i++)
1518     {
1519       const struct m68k_opcode *opc = opcodes[major_opcode][i];
1520       unsigned long opcode = opc->opcode;
1521       unsigned long match = opc->match;
1522       const char *args = opc->args;
1523
1524       if (*args == '.')
1525         args++;
1526
1527       if (((0xff & buffer[0] & (match >> 24)) == (0xff & (opcode >> 24)))
1528           && ((0xff & buffer[1] & (match >> 16)) == (0xff & (opcode >> 16)))
1529           /* Only fetch the next two bytes if we need to.  */
1530           && (((0xffff & match) == 0)
1531               ||
1532               (FETCH_DATA (info, buffer + 4)
1533                && ((0xff & buffer[2] & (match >> 8)) == (0xff & (opcode >> 8)))
1534                && ((0xff & buffer[3] & match) == (0xff & opcode)))
1535               )
1536           && (opc->arch & arch_mask) != 0)
1537         {
1538           /* Don't use for printout the variants of divul and divsl
1539              that have the same register number in two places.
1540              The more general variants will match instead.  */
1541           for (d = args; *d; d += 2)
1542             if (d[1] == 'D')
1543               break;
1544
1545           /* Don't use for printout the variants of most floating
1546              point coprocessor instructions which use the same
1547              register number in two places, as above.  */
1548           if (*d == '\0')
1549             for (d = args; *d; d += 2)
1550               if (d[1] == 't')
1551                 break;
1552
1553           /* Don't match fmovel with more than one register;
1554              wait for fmoveml.  */
1555           if (*d == '\0')
1556             {
1557               for (d = args; *d; d += 2)
1558                 {
1559                   if (d[0] == 's' && d[1] == '8')
1560                     {
1561                       val = fetch_arg (buffer, d[1], 3, info);
1562                       if (val < 0)
1563                         return 0;
1564                       if ((val & (val - 1)) != 0)
1565                         break;
1566                     }
1567                 }
1568             }
1569
1570           /* Don't match FPU insns with non-default coprocessor ID.  */
1571           if (*d == '\0')
1572             {
1573               for (d = args; *d; d += 2)
1574                 {
1575                   if (d[0] == 'I')
1576                     {
1577                       val = fetch_arg (buffer, 'd', 3, info);
1578                       if (val != 1)
1579                         break;
1580                     }
1581                 }
1582             }
1583
1584           if (*d == '\0')
1585             if ((val = match_insn_m68k (memaddr, info, opc)))
1586               return val;
1587         }
1588     }
1589   return 0;
1590 }
1591
1592 /* Print the m68k instruction at address MEMADDR in debugged memory,
1593    on INFO->STREAM.  Returns length of the instruction, in bytes.  */
1594
1595 int
1596 print_insn_m68k (bfd_vma memaddr, disassemble_info *info)
1597 {
1598   unsigned int arch_mask;
1599   struct private priv;
1600   int val;
1601
1602   bfd_byte *buffer = priv.the_buffer;
1603
1604   info->private_data = & priv;
1605   /* Tell objdump to use two bytes per chunk
1606      and six bytes per line for displaying raw data.  */
1607   info->bytes_per_chunk = 2;
1608   info->bytes_per_line = 6;
1609   info->display_endian = BFD_ENDIAN_BIG;
1610   priv.max_fetched = priv.the_buffer;
1611   priv.insn_start = memaddr;
1612
1613   arch_mask = bfd_m68k_mach_to_features (info->mach);
1614   if (!arch_mask)
1615     {
1616       /* First try printing an m680x0 instruction.  Try printing a Coldfire
1617          one if that fails.  */
1618       val = m68k_scan_mask (memaddr, info, m68k_mask);
1619       if (val == 0)
1620         val = m68k_scan_mask (memaddr, info, mcf_mask);
1621     }
1622   else
1623     {
1624       val = m68k_scan_mask (memaddr, info, arch_mask);
1625     }
1626
1627   if (val == 0)
1628     /* Handle undefined instructions.  */
1629     info->fprintf_func (info->stream, "0%o", (buffer[0] << 8) + buffer[1]);
1630
1631   return val ? val : 2;
1632 }