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