osprey/cygnus/opcodes/m68k-dis.c

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/*
 * Copyright 2003, 2004, 2005, 2006 PathScale, Inc.  All Rights Reserved.
 */

/* Print Motorola 68k instructions.
   Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
   1998, 1999, 2000, 2001, 2002, 2003, 2004
   Free Software Foundation, Inc.

   This file is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include "sysdep.h"
#include "dis-asm.h"
#include "floatformat.h"
#include "libiberty.h"
#include "opintl.h"

#include "opcode/m68k.h"

/* Local function prototypes */

static int
fetch_data PARAMS ((struct disassemble_info *, bfd_byte *));

static void
dummy_print_address PARAMS ((bfd_vma, struct disassemble_info *));

static int
fetch_arg PARAMS ((unsigned char *, int, int, disassemble_info *));

static void
print_base PARAMS ((int, bfd_vma, disassemble_info *));

static unsigned char *
print_indexed PARAMS ((int, unsigned char *, bfd_vma, disassemble_info *));

static int
print_insn_arg PARAMS ((const char *, unsigned char *, unsigned char *,
      bfd_vma, disassemble_info *));

static bfd_boolean m68k_valid_ea (char code, int val);

const char * const fpcr_names[] =
{
    "", "%fpiar", "%fpsr", "%fpiar/%fpsr", "%fpcr",
    "%fpiar/%fpcr", "%fpsr/%fpcr", "%fpiar/%fpsr/%fpcr"
};

static char *const reg_names[] =
{
    "%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7",
    "%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%fp", "%sp",
    "%ps", "%pc"
};

/* Name of register halves for MAC/EMAC.
   Seperate from reg_names since 'spu', 'fpl' look weird.  */
static char *const reg_half_names[] =
{
    "%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7",
    "%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%a6", "%a7",
    "%ps", "%pc"
};

/* Sign-extend an (unsigned char).  */
#if __STDC__ == 1
#define COERCE_SIGNED_CHAR(ch) ((signed char) (ch))
#else
#define COERCE_SIGNED_CHAR(ch) ((int) (((ch) ^ 0x80) & 0xFF) - 128)
#endif

/* Get a 1 byte signed integer.  */
#define NEXTBYTE(p)  (p += 2, FETCH_DATA (info, p), COERCE_SIGNED_CHAR(p[-1]))

/* Get a 2 byte signed integer.  */
#define COERCE16(x) ((int) (((x) ^ 0x8000) - 0x8000))
#define NEXTWORD(p)  \
  (p += 2, FETCH_DATA (info, p), \
   COERCE16 ((p[-2] << 8) + p[-1]))

/* Get a 4 byte signed integer.  */
#define COERCE32(x) ((bfd_signed_vma) ((x) ^ 0x80000000) - 0x80000000)
#define NEXTLONG(p)  \
  (p += 4, FETCH_DATA (info, p), \
   (COERCE32 ((((((p[-4] << 8) + p[-3]) << 8) + p[-2]) << 8) + p[-1])))

/* Get a 4 byte unsigned integer.  */
#define NEXTULONG(p)  \
  (p += 4, FETCH_DATA (info, p), \
   (unsigned int) ((((((p[-4] << 8) + p[-3]) << 8) + p[-2]) << 8) + p[-1]))

/* Get a single precision float.  */
#define NEXTSINGLE(val, p) \
  (p += 4, FETCH_DATA (info, p), \
   floatformat_to_double (&floatformat_ieee_single_big, (char *) p - 4, &val))

/* Get a double precision float.  */
#define NEXTDOUBLE(val, p) \
  (p += 8, FETCH_DATA (info, p), \
   floatformat_to_double (&floatformat_ieee_double_big, (char *) p - 8, &val))

/* Get an extended precision float.  */
#define NEXTEXTEND(val, p) \
  (p += 12, FETCH_DATA (info, p), \
   floatformat_to_double (&floatformat_m68881_ext, (char *) p - 12, &val))

/* Need a function to convert from packed to double
   precision.   Actually, it's easier to print a
   packed number than a double anyway, so maybe
   there should be a special case to handle this... */
#define NEXTPACKED(p) \
  (p += 12, FETCH_DATA (info, p), 0.0)

/* Maximum length of an instruction.  */
#define MAXLEN 22

#include <setjmp.h>

struct private {
  /* Points to first byte not fetched.  */
  bfd_byte *max_fetched;
  bfd_byte the_buffer[MAXLEN];
  bfd_vma insn_start;
  jmp_buf bailout;
};

/* Make sure that bytes from INFO->PRIVATE_DATA->BUFFER (inclusive)
   to ADDR (exclusive) are valid.  Returns 1 for success, longjmps
   on error.  */
#define FETCH_DATA(info, addr) \
  ((addr) <= ((struct private *) (info->private_data))->max_fetched \
   ? 1 : fetch_data ((info), (addr)))

static int
fetch_data (info, addr)
     struct disassemble_info *info;
     bfd_byte *addr;
{
  int status;
  struct private *priv = (struct private *)info->private_data;
  bfd_vma start = priv->insn_start + (priv->max_fetched - priv->the_buffer);

  status = (*info->read_memory_func) (start,
              priv->max_fetched,
              addr - priv->max_fetched,
              info);
  if (status != 0)
    {
      (*info->memory_error_func) (status, start, info);
      longjmp (priv->bailout, 1);
    }
  else
    priv->max_fetched = addr;
  return 1;
}

/* This function is used to print to the bit-bucket. */
static int
#ifdef __STDC__
dummy_printer (FILE *file ATTRIBUTE_UNUSED,
         const char *format ATTRIBUTE_UNUSED, ...)
#else
dummy_printer (file)
     FILE *file ATTRIBUTE_UNUSED;
#endif
{
  return 0;
}

static void
dummy_print_address (vma, info)
     bfd_vma vma ATTRIBUTE_UNUSED;
     struct disassemble_info *info ATTRIBUTE_UNUSED;
{
}

/* Try to match the current instruction to best and if so, return the
   number of bytes consumed from the instruction stream, else zero.  */

static int
match_insn_m68k (bfd_vma memaddr, disassemble_info * info,
     const struct m68k_opcode * best, struct private * priv)
{
  unsigned char *save_p;
  unsigned char *p;
  const char *d;

  bfd_byte *buffer = priv->the_buffer;
  fprintf_ftype save_printer = info->fprintf_func;
  void (* save_print_address) (bfd_vma, struct disassemble_info *)
    = info->print_address_func;

  /* Point at first word of argument data,
     and at descriptor for first argument.  */
  p = buffer + 2;

  /* Figure out how long the fixed-size portion of the instruction is.
     The only place this is stored in the opcode table is
     in the arguments--look for arguments which specify fields in the 2nd
     or 3rd words of the instruction.  */
  for (d = best->args; *d; d += 2)
    {
      /* I don't think it is necessary to be checking d[0] here;
   I suspect all this could be moved to the case statement below.  */
      if (d[0] == '#')
  {
    if (d[1] == 'l' && p - buffer < 6)
      p = buffer + 6;
    else if (p - buffer < 4 && d[1] != 'C' && d[1] != '8')
      p = buffer + 4;
  }

      if ((d[0] == 'L' || d[0] == 'l') && d[1] == 'w' && p - buffer < 4)
  p = buffer + 4;

      switch (d[1])
  {
  case '1':
  case '2':
  case '3':
  case '7':
  case '8':
  case '9':
  case 'i':
    if (p - buffer < 4)
      p = buffer + 4;
    break;
  case '4':
  case '5':
  case '6':
    if (p - buffer < 6)
      p = buffer + 6;
    break;
  default:
    break;
  }
    }

  /* pflusha is an exceptions.  It takes no arguments but is two words
     long.  Recognize it by looking at the lower 16 bits of the mask.  */
  if (p - buffer < 4 && (best->match & 0xFFFF) != 0)
    p = buffer + 4;

  /* lpstop is another exception.  It takes a one word argument but is
     three words long.  */
  if (p - buffer < 6
      && (best->match & 0xffff) == 0xffff
      && best->args[0] == '#'
      && best->args[1] == 'w')
    {
      /* Copy the one word argument into the usual location for a one
   word argument, to simplify printing it.  We can get away with
   this because we know exactly what the second word is, and we
   aren't going to print anything based on it.  */
      p = buffer + 6;
      FETCH_DATA (info, p);
      buffer[2] = buffer[4];
      buffer[3] = buffer[5];
    }

  FETCH_DATA (info, p);

  d = best->args;

  save_p = p;
  info->print_address_func = dummy_print_address;
  info->fprintf_func = (fprintf_ftype) dummy_printer;

  /* We scan the operands twice.  The first time we don't print anything,
     but look for errors. */
  for (; *d; d += 2)
    {
      int eaten = print_insn_arg (d, buffer, p, memaddr + (p - buffer), info);

      if (eaten >= 0)
  p += eaten;
      else if (eaten == -1)
  {
    info->fprintf_func = save_printer;
    info->print_address_func = save_print_address;
    return 0;
  }
      else
  {
    info->fprintf_func (info->stream,
            /* xgettext:c-format */
            _("<internal error in opcode table: %s %s>\n"),
            best->name,  best->args);
    info->fprintf_func = save_printer;
    info->print_address_func = save_print_address;
    return 2;
  }
    }

  p = save_p;
  info->fprintf_func = save_printer;
  info->print_address_func = save_print_address;

  d = best->args;

  info->fprintf_func (info->stream, "%s", best->name);

  if (*d)
    info->fprintf_func (info->stream, " ");

  while (*d)
    {
      p += print_insn_arg (d, buffer, p, memaddr + (p - buffer), info);
      d += 2;

      if (*d && *(d - 2) != 'I' && *d != 'k')
  info->fprintf_func (info->stream, ",");
    }

  return p - buffer;
}

/* Print the m68k instruction at address MEMADDR in debugged memory,
   on INFO->STREAM.  Returns length of the instruction, in bytes.  */

int
print_insn_m68k (memaddr, info)
     bfd_vma memaddr;
     disassemble_info *info;
{
  int i;
  const char *d;
  unsigned int arch_mask;
  struct private priv;
  bfd_byte *buffer = priv.the_buffer;
  int major_opcode;
  static int numopcodes[16];
  static const struct m68k_opcode **opcodes[16];
  int val;

  if (!opcodes[0])
    {
      /* Speed up the matching by sorting the opcode
   table on the upper four bits of the opcode.  */
      const struct m68k_opcode **opc_pointer[16];

      /* First count how many opcodes are in each of the sixteen buckets.  */
      for (i = 0; i < m68k_numopcodes; i++)
  numopcodes[(m68k_opcodes[i].opcode >> 28) & 15]++;

      /* Then create a sorted table of pointers
   that point into the unsorted table.  */
      opc_pointer[0] = xmalloc (sizeof (struct m68k_opcode *)
        * m68k_numopcodes);
      opcodes[0] = opc_pointer[0];

      for (i = 1; i < 16; i++)
  {
    opc_pointer[i] = opc_pointer[i - 1] + numopcodes[i - 1];
    opcodes[i] = opc_pointer[i];
  }

      for (i = 0; i < m68k_numopcodes; i++)
  *opc_pointer[(m68k_opcodes[i].opcode >> 28) & 15]++ = &m68k_opcodes[i];
    }

  info->private_data = (PTR) &priv;
  /* Tell objdump to use two bytes per chunk
     and six bytes per line for displaying raw data.  */
  info->bytes_per_chunk = 2;
  info->bytes_per_line = 6;
  info->display_endian = BFD_ENDIAN_BIG;
  priv.max_fetched = priv.the_buffer;
  priv.insn_start = memaddr;

  if (setjmp (priv.bailout) != 0)
    /* Error return.  */
    return -1;

  switch (info->mach)
    {
    default:
    case 0:
      arch_mask = (unsigned int) -1;
      break;
    case bfd_mach_m68000:
      arch_mask = m68000|m68881|m68851;
      break;
    case bfd_mach_m68008:
      arch_mask = m68008|m68881|m68851;
      break;
    case bfd_mach_m68010:
      arch_mask = m68010|m68881|m68851;
      break;
    case bfd_mach_m68020:
      arch_mask = m68020|m68881|m68851;
      break;
    case bfd_mach_m68030:
      arch_mask = m68030|m68881|m68851;
      break;
    case bfd_mach_m68040:
      arch_mask = m68040|m68881|m68851;
      break;
    case bfd_mach_m68060:
      arch_mask = m68060|m68881|m68851;
      break;
    case bfd_mach_mcf5200:
      arch_mask = mcfisa_a;
      break;
    case bfd_mach_mcf521x:
    case bfd_mach_mcf528x:
      arch_mask = mcfisa_a|mcfhwdiv|mcfisa_aa|mcfusp|mcfemac;
      break;
    case bfd_mach_mcf5206e:
      arch_mask = mcfisa_a|mcfhwdiv|mcfmac;
      break;
    case bfd_mach_mcf5249:
      arch_mask = mcfisa_a|mcfhwdiv|mcfemac;
      break;
    case bfd_mach_mcf5307:
      arch_mask = mcfisa_a|mcfhwdiv|mcfmac;
      break;
    case bfd_mach_mcf5407:
      arch_mask = mcfisa_a|mcfhwdiv|mcfisa_b|mcfmac;
      break;
    case bfd_mach_mcf547x:
    case bfd_mach_mcf548x:
    case bfd_mach_mcfv4e:
      arch_mask = mcfisa_a|mcfhwdiv|mcfisa_b|mcfusp|cfloat|mcfemac;
      break;
    }

  FETCH_DATA (info, buffer + 2);
  major_opcode = (buffer[0] >> 4) & 15;

  for (i = 0; i < numopcodes[major_opcode]; i++)
    {
      const struct m68k_opcode *opc = opcodes[major_opcode][i];
      unsigned long opcode = opc->opcode;
      unsigned long match = opc->match;

      if (((0xff & buffer[0] & (match >> 24)) == (0xff & (opcode >> 24)))
    && ((0xff & buffer[1] & (match >> 16)) == (0xff & (opcode >> 16)))
    /* Only fetch the next two bytes if we need to.  */
    && (((0xffff & match) == 0)
        ||
        (FETCH_DATA (info, buffer + 4)
         && ((0xff & buffer[2] & (match >> 8)) == (0xff & (opcode >> 8)))
         && ((0xff & buffer[3] & match) == (0xff & opcode)))
        )
    && (opc->arch & arch_mask) != 0)
  {
    /* Don't use for printout the variants of divul and divsl
       that have the same register number in two places.
       The more general variants will match instead.  */
    for (d = opc->args; *d; d += 2)
      if (d[1] == 'D')
        break;

    /* Don't use for printout the variants of most floating
       point coprocessor instructions which use the same
       register number in two places, as above.  */
    if (*d == '\0')
      for (d = opc->args; *d; d += 2)
        if (d[1] == 't')
    break;

    /* Don't match fmovel with more than one register;
       wait for fmoveml.  */
    if (*d == '\0')
      {
        for (d = opc->args; *d; d += 2)
    {
      if (d[0] == 's' && d[1] == '8')
        {
          val = fetch_arg (buffer, d[1], 3, info);
          if ((val & (val - 1)) != 0)
      break;
        }
    }
      }

    if (*d == '\0')
      if ((val = match_insn_m68k (memaddr, info, opc, & priv)))
        return val;
  }
    }

  /* Handle undefined instructions.  */
  info->fprintf_func (info->stream, "0%o", (buffer[0] << 8) + buffer[1]);
  return 2;
}

/* Returns number of bytes "eaten" by the operand, or
   return -1 if an invalid operand was found, or -2 if
   an opcode tabe error was found.  */

static int
print_insn_arg (d, buffer, p0, addr, info)
     const char *d;
     unsigned char *buffer;
     unsigned char *p0;
     bfd_vma addr;    /* PC for this arg to be relative to.  */
     disassemble_info *info;
{
  int val = 0;
  int place = d[1];
  unsigned char *p = p0;
  int regno;
  const char *regname;
  unsigned char *p1;
  double flval;
  int flt_p;
  bfd_signed_vma disp;
  unsigned int uval;

  switch (*d)
    {
    case 'c':   /* Cache identifier.  */
      {
        static char *const cacheFieldName[] = { "nc", "dc", "ic", "bc" };
        val = fetch_arg (buffer, place, 2, info);
        (*info->fprintf_func) (info->stream, cacheFieldName[val]);
        break;
      }

    case 'a':   /* Address register indirect only. Cf. case '+'.  */
      {
        (*info->fprintf_func)
    (info->stream,
     "%s@",
     reg_names[fetch_arg (buffer, place, 3, info) + 8]);
        break;
      }

    case '_':   /* 32-bit absolute address for move16.  */
      {
        uval = NEXTULONG (p);
  (*info->print_address_func) (uval, info);
        break;
      }

    case 'C':
      (*info->fprintf_func) (info->stream, "%%ccr");
      break;

    case 'S':
      (*info->fprintf_func) (info->stream, "%%sr");
      break;

    case 'U':
      (*info->fprintf_func) (info->stream, "%%usp");
      break;

    case 'E':
      (*info->fprintf_func) (info->stream, "%%acc");
      break;

    case 'G':
      (*info->fprintf_func) (info->stream, "%%macsr");
      break;

    case 'H':
      (*info->fprintf_func) (info->stream, "%%mask");
      break;

    case 'J':
      {
  /* FIXME: There's a problem here, different m68k processors call the
     same address different names. This table can't get it right
     because it doesn't know which processor it's disassembling for.  */
  static const struct { char *name; int value; } names[]
    = {{"%sfc", 0x000}, {"%dfc", 0x001}, {"%cacr", 0x002},
       {"%tc",  0x003}, {"%itt0",0x004}, {"%itt1", 0x005},
             {"%dtt0",0x006}, {"%dtt1",0x007}, {"%buscr",0x008},
       {"%usp", 0x800}, {"%vbr", 0x801}, {"%caar", 0x802},
       {"%msp", 0x803}, {"%isp", 0x804},
       {"%flashbar", 0xc04}, {"%rambar", 0xc05}, /* mcf528x added these.  */

       /* Should we be calling this psr like we do in case 'Y'?  */
       {"%mmusr",0x805},

             {"%urp", 0x806}, {"%srp", 0x807}, {"%pcr", 0x808}};

  val = fetch_arg (buffer, place, 12, info);
  for (regno = sizeof names / sizeof names[0] - 1; regno >= 0; regno--)
    if (names[regno].value == val)
      {
        (*info->fprintf_func) (info->stream, "%s", names[regno].name);
        break;
      }
  if (regno < 0)
    (*info->fprintf_func) (info->stream, "%d", val);
      }
      break;

    case 'Q':
      val = fetch_arg (buffer, place, 3, info);
      /* 0 means 8, except for the bkpt instruction... */
      if (val == 0 && d[1] != 's')
  val = 8;
      (*info->fprintf_func) (info->stream, "#%d", val);
      break;

    case 'x':
      val = fetch_arg (buffer, place, 3, info);
      /* 0 means -1.  */
      if (val == 0)
  val = -1;
      (*info->fprintf_func) (info->stream, "#%d", val);
      break;

    case 'M':
      if (place == 'h')
  {
    static char *const scalefactor_name[] = { "<<", ">>" };
    val = fetch_arg (buffer, place, 1, info);
    (*info->fprintf_func) (info->stream, scalefactor_name[val]);
  }
      else
  {
    val = fetch_arg (buffer, place, 8, info);
    if (val & 0x80)
      val = val - 0x100;
    (*info->fprintf_func) (info->stream, "#%d", val);
  }
      break;

    case 'T':
      val = fetch_arg (buffer, place, 4, info);
      (*info->fprintf_func) (info->stream, "#%d", val);
      break;

    case 'D':
      (*info->fprintf_func) (info->stream, "%s",
           reg_names[fetch_arg (buffer, place, 3, info)]);
      break;

    case 'A':
      (*info->fprintf_func)
  (info->stream, "%s",
   reg_names[fetch_arg (buffer, place, 3, info) + 010]);
      break;

    case 'R':
      (*info->fprintf_func)
  (info->stream, "%s",
   reg_names[fetch_arg (buffer, place, 4, info)]);
      break;

    case 'r':
      regno = fetch_arg (buffer, place, 4, info);
      if (regno > 7)
  (*info->fprintf_func) (info->stream, "%s@", reg_names[regno]);
      else
  (*info->fprintf_func) (info->stream, "@(%s)", reg_names[regno]);
      break;

    case 'F':
      (*info->fprintf_func)
  (info->stream, "%%fp%d",
   fetch_arg (buffer, place, 3, info));
      break;

    case 'O':
      val = fetch_arg (buffer, place, 6, info);
      if (val & 0x20)
  (*info->fprintf_func) (info->stream, "%s", reg_names[val & 7]);
      else
  (*info->fprintf_func) (info->stream, "%d", val);
      break;

    case '+':
      (*info->fprintf_func)
  (info->stream, "%s@+",
   reg_names[fetch_arg (buffer, place, 3, info) + 8]);
      break;

    case '-':
      (*info->fprintf_func)
  (info->stream, "%s@-",
   reg_names[fetch_arg (buffer, place, 3, info) + 8]);
      break;

    case 'k':
      if (place == 'k')
  (*info->fprintf_func)
    (info->stream, "{%s}",
     reg_names[fetch_arg (buffer, place, 3, info)]);
      else if (place == 'C')
  {
    val = fetch_arg (buffer, place, 7, info);
    if (val > 63)   /* This is a signed constant. */
      val -= 128;
    (*info->fprintf_func) (info->stream, "{#%d}", val);
  }
      else
  return -2;
      break;

    case '#':
    case '^':
      p1 = buffer + (*d == '#' ? 2 : 4);
      if (place == 's')
  val = fetch_arg (buffer, place, 4, info);
      else if (place == 'C')
  val = fetch_arg (buffer, place, 7, info);
      else if (place == '8')
  val = fetch_arg (buffer, place, 3, info);
      else if (place == '3')
  val = fetch_arg (buffer, place, 8, info);
      else if (place == 'b')
  val = NEXTBYTE (p1);
      else if (place == 'w' || place == 'W')
  val = NEXTWORD (p1);
      else if (place == 'l')
  val = NEXTLONG (p1);
      else
  return -2;
      (*info->fprintf_func) (info->stream, "#%d", val);
      break;

    case 'B':
      if (place == 'b')
  disp = NEXTBYTE (p);
      else if (place == 'B')
  disp = COERCE_SIGNED_CHAR (buffer[1]);
      else if (place == 'w' || place == 'W')
  disp = NEXTWORD (p);
      else if (place == 'l' || place == 'L' || place == 'C')
  disp = NEXTLONG (p);
      else if (place == 'g')
  {
    disp = NEXTBYTE (buffer);
    if (disp == 0)
      disp = NEXTWORD (p);
    else if (disp == -1)
      disp = NEXTLONG (p);
  }
      else if (place == 'c')
  {
    if (buffer[1] & 0x40)   /* If bit six is one, long offset */
      disp = NEXTLONG (p);
    else
      disp = NEXTWORD (p);
  }
      else
  return -2;

      (*info->print_address_func) (addr + disp, info);
      break;

    case 'd':
      val = NEXTWORD (p);
      (*info->fprintf_func)
  (info->stream, "%s@(%d)",
   reg_names[fetch_arg (buffer, place, 3, info) + 8], val);
      break;

    case 's':
      (*info->fprintf_func) (info->stream, "%s",
           fpcr_names[fetch_arg (buffer, place, 3, info)]);
      break;

    case 'e':
      val = fetch_arg(buffer, place, 2, info);
      (*info->fprintf_func) (info->stream, "%%acc%d", val);
      break;

    case 'g':
      val = fetch_arg(buffer, place, 1, info);
      (*info->fprintf_func) (info->stream, "%%accext%s", val==0 ? "01" : "23");
      break;
      
    case 'i':
      val = fetch_arg(buffer, place, 2, info);
      if (val == 1)
  (*info->fprintf_func) (info->stream, "<<");
      else if (val == 3)
  (*info->fprintf_func) (info->stream, ">>");
      else
  return -1;
      break;

    case 'I':
      /* Get coprocessor ID... */
      val = fetch_arg (buffer, 'd', 3, info);

      if (val != 1)       /* Unusual coprocessor ID? */
  (*info->fprintf_func) (info->stream, "(cpid=%d) ", val);
      break;

    case '4':
    case '*':
    case '~':
    case '%':
    case ';':
    case '@':
    case '!':
    case '$':
    case '?':
    case '/':
    case '&':
    case '|':
    case '<':
    case '>':
    case 'm':
    case 'n':
    case 'o':
    case 'p':
    case 'q':
    case 'v':
    case 'b':
    case 'w':
    case 'y':
    case 'z':
      if (place == 'd')
  {
    val = fetch_arg (buffer, 'x', 6, info);
    val = ((val & 7) << 3) + ((val >> 3) & 7);
  }
      else
  val = fetch_arg (buffer, 's', 6, info);

      /* If the <ea> is invalid for *d, then reject this match.  */
      if (!m68k_valid_ea (*d, val))
  return -1;

      /* Get register number assuming address register.  */
      regno = (val & 7) + 8;
      regname = reg_names[regno];
      switch (val >> 3)
  {
  case 0:
    (*info->fprintf_func) (info->stream, "%s", reg_names[val]);
    break;

  case 1:
    (*info->fprintf_func) (info->stream, "%s", regname);
    break;

  case 2:
    (*info->fprintf_func) (info->stream, "%s@", regname);
    break;

  case 3:
    (*info->fprintf_func) (info->stream, "%s@+", regname);
    break;

  case 4:
    (*info->fprintf_func) (info->stream, "%s@-", regname);
    break;

  case 5:
    val = NEXTWORD (p);
    (*info->fprintf_func) (info->stream, "%s@(%d)", regname, val);
    break;

  case 6:
    p = print_indexed (regno, p, addr, info);
    break;

  case 7:
    switch (val & 7)
      {
      case 0:
        val = NEXTWORD (p);
        (*info->print_address_func) (val, info);
        break;

      case 1:
        uval = NEXTULONG (p);
        (*info->print_address_func) (uval, info);
        break;

      case 2:
        val = NEXTWORD (p);
        (*info->fprintf_func) (info->stream, "%%pc@(");
        (*info->print_address_func) (addr + val, info);
        (*info->fprintf_func) (info->stream, ")");
        break;

      case 3:
        p = print_indexed (-1, p, addr, info);
        break;

      case 4:
        flt_p = 1;  /* Assume it's a float... */
        switch (place)
        {
    case 'b':
      val = NEXTBYTE (p);
      flt_p = 0;
      break;

    case 'w':
      val = NEXTWORD (p);
      flt_p = 0;
      break;

    case 'l':
      val = NEXTLONG (p);
      flt_p = 0;
      break;

    case 'f':
      NEXTSINGLE (flval, p);
      break;

    case 'F':
      NEXTDOUBLE (flval, p);
      break;

    case 'x':
      NEXTEXTEND (flval, p);
      break;

    case 'p':
      flval = NEXTPACKED (p);
      break;

    default:
      return -1;
        }
        if (flt_p)  /* Print a float? */
    (*info->fprintf_func) (info->stream, "#%g", flval);
        else
    (*info->fprintf_func) (info->stream, "#%d", val);
        break;

      default:
        return -1;
      }
  }

      /* If place is '/', then this is the case of the mask bit for
   mac/emac loads. Now that the arg has been printed, grab the
   mask bit and if set, add a '&' to the arg.  */
      if (place == '/')
  {
    val = fetch_arg (buffer, place, 1, info);
    if (val)
      info->fprintf_func (info->stream, "&");
  }
      break;

    case 'L':
    case 'l':
  if (place == 'w')
    {
      char doneany;
      p1 = buffer + 2;
      val = NEXTWORD (p1);
      /* Move the pointer ahead if this point is farther ahead
         than the last.  */
      p = p1 > p ? p1 : p;
      if (val == 0)
        {
    (*info->fprintf_func) (info->stream, "#0");
    break;
        }
      if (*d == 'l')
        {
    register int newval = 0;
    for (regno = 0; regno < 16; ++regno)
      if (val & (0x8000 >> regno))
        newval |= 1 << regno;
    val = newval;
        }
      val &= 0xffff;
      doneany = 0;
      for (regno = 0; regno < 16; ++regno)
        if (val & (1 << regno))
    {
      int first_regno;
      if (doneany)
        (*info->fprintf_func) (info->stream, "/");
      doneany = 1;
      (*info->fprintf_func) (info->stream, "%s", reg_names[regno]);
      first_regno = regno;
      while (val & (1 << (regno + 1)))
        ++regno;
      if (regno > first_regno)
        (*info->fprintf_func) (info->stream, "-%s",
             reg_names[regno]);
    }
    }
  else if (place == '3')
    {
      /* `fmovem' insn.  */
      char doneany;
      val = fetch_arg (buffer, place, 8, info);
      if (val == 0)
        {
    (*info->fprintf_func) (info->stream, "#0");
    break;
        }
      if (*d == 'l')
        {
    register int newval = 0;
    for (regno = 0; regno < 8; ++regno)
      if (val & (0x80 >> regno))
        newval |= 1 << regno;
    val = newval;
        }
      val &= 0xff;
      doneany = 0;
      for (regno = 0; regno < 8; ++regno)
        if (val & (1 << regno))
    {
      int first_regno;
      if (doneany)
        (*info->fprintf_func) (info->stream, "/");
      doneany = 1;
      (*info->fprintf_func) (info->stream, "%%fp%d", regno);
      first_regno = regno;
      while (val & (1 << (regno + 1)))
        ++regno;
      if (regno > first_regno)
        (*info->fprintf_func) (info->stream, "-%%fp%d", regno);
    }
    }
  else if (place == '8')
    {
      /* fmoveml for FP status registers */
      (*info->fprintf_func) (info->stream, "%s",
           fpcr_names[fetch_arg (buffer, place, 3,
               info)]);
    }
  else
    return -2;
      break;

    case 'X':
      place = '8';
    case 'Y':
    case 'Z':
    case 'W':
    case '0':
    case '1':
    case '2':
    case '3':
      {
  int val = fetch_arg (buffer, place, 5, info);
  char *name = 0;
  switch (val)
    {
    case 2: name = "%tt0"; break;
    case 3: name = "%tt1"; break;
    case 0x10: name = "%tc"; break;
    case 0x11: name = "%drp"; break;
    case 0x12: name = "%srp"; break;
    case 0x13: name = "%crp"; break;
    case 0x14: name = "%cal"; break;
    case 0x15: name = "%val"; break;
    case 0x16: name = "%scc"; break;
    case 0x17: name = "%ac"; break;
    case 0x18: name = "%psr"; break;
    case 0x19: name = "%pcsr"; break;
    case 0x1c:
    case 0x1d:
      {
        int break_reg = ((buffer[3] >> 2) & 7);
        (*info->fprintf_func)
    (info->stream, val == 0x1c ? "%%bad%d" : "%%bac%d",
     break_reg);
      }
      break;
    default:
      (*info->fprintf_func) (info->stream, "<mmu register %d>", val);
    }
  if (name)
    (*info->fprintf_func) (info->stream, "%s", name);
      }
      break;

    case 'f':
      {
  int fc = fetch_arg (buffer, place, 5, info);
  if (fc == 1)
    (*info->fprintf_func) (info->stream, "%%dfc");
  else if (fc == 0)
    (*info->fprintf_func) (info->stream, "%%sfc");
  else
    /* xgettext:c-format */
    (*info->fprintf_func) (info->stream, _("<function code %d>"), fc);
      }
      break;

    case 'V':
      (*info->fprintf_func) (info->stream, "%%val");
      break;

    case 't':
      {
  int level = fetch_arg (buffer, place, 3, info);
  (*info->fprintf_func) (info->stream, "%d", level);
      }
      break;

    case 'u':
      {
  short is_upper = 0;
  int reg = fetch_arg (buffer, place, 5, info);

  if (reg & 0x10)
    {
      is_upper = 1;
      reg &= 0xf;
    }
  (*info->fprintf_func) (info->stream, "%s%s",
             reg_half_names[reg],
             is_upper ? "u" : "l");
      }
      break;

    default:
      return -2;
    }

  return p - p0;
}

/* Check if an EA is valid for a particular code.  This is required
   for the EMAC instructions since the type of source address determines
   if it is a EMAC-load instruciton if the EA is mode 2-5, otherwise it
   is a non-load EMAC instruction and the bits mean register Ry.
   A similar case exists for the movem instructions where the register
   mask is interpreted differently for different EAs.  */

static bfd_boolean
m68k_valid_ea (char code, int val)
{
  int mode, mask;
#define M(n0,n1,n2,n3,n4,n5,n6,n70,n71,n72,n73,n74) \
  (n0 | n1 << 1 | n2 << 2 | n3 << 3 | n4 << 4 | n5 << 5 | n6 << 6 \
   | n70 << 7 | n71 << 8 | n72 << 9 | n73 << 10 | n74 << 11)

  switch (code)
    {
    case '*':
      mask = M (1,1,1,1,1,1,1,1,1,1,1,1);
      break;
    case '~':
      mask = M (0,0,1,1,1,1,1,1,1,0,0,0);
      break;
    case '%':
      mask = M (1,1,1,1,1,1,1,1,1,0,0,0);
      break;
    case ';':
      mask = M (1,0,1,1,1,1,1,1,1,1,1,1);
      break;
    case '@':
      mask = M (1,0,1,1,1,1,1,1,1,1,1,0);
      break;
    case '!':
      mask = M (0,0,1,0,0,1,1,1,1,1,1,0);
      break;
    case '&':
      mask = M (0,0,1,0,0,1,1,1,1,0,0,0);
      break;
    case '$':
      mask = M (1,0,1,1,1,1,1,1,1,0,0,0);
      break;
    case '?':
      mask = M (1,0,1,0,0,1,1,1,1,0,0,0);
      break;
    case '/':
      mask = M (1,0,1,0,0,1,1,1,1,1,1,0);
      break;
    case '|':
      mask = M (0,0,1,0,0,1,1,1,1,1,1,0);
      break;
    case '>':
      mask = M (0,0,1,0,1,1,1,1,1,0,0,0);
      break;
    case '<':
      mask = M (0,0,1,1,0,1,1,1,1,1,1,0);
      break;
    case 'm':
      mask = M (1,1,1,1,1,0,0,0,0,0,0,0);
      break;
    case 'n':
      mask = M (0,0,0,0,0,1,0,0,0,1,0,0);
      break;
    case 'o':
      mask = M (0,0,0,0,0,0,1,1,1,0,1,1);
      break;
    case 'p':
      mask = M (1,1,1,1,1,1,0,0,0,0,0,0);
      break;
    case 'q':
      mask = M (1,0,1,1,1,1,0,0,0,0,0,0);
      break;
    case 'v':
      mask = M (1,0,1,1,1,1,0,1,1,0,0,0);
      break;
    case 'b':
      mask = M (1,0,1,1,1,1,0,0,0,1,0,0);
      break;
    case 'w':
      mask = M (0,0,1,1,1,1,0,0,0,1,0,0);
      break;
    case 'y':
      mask = M (0,0,1,0,0,1,0,0,0,0,0,0);
      break;
    case 'z':
      mask = M (0,0,1,0,0,1,0,0,0,1,0,0);
      break;
    case '4':
      mask = M (0,0,1,1,1,1,0,0,0,0,0,0);
      break;
    default:
      abort ();
    }
#undef M

  mode = (val >> 3) & 7;
  if (mode == 7)
    mode += val & 7;
  return (mask & (1 << mode)) != 0;
}

/* Fetch BITS bits from a position in the instruction specified by CODE.
   CODE is a "place to put an argument", or 'x' for a destination
   that is a general address (mode and register).
   BUFFER contains the instruction.  */

static int
fetch_arg (buffer, code, bits, info)
     unsigned char *buffer;
     int code;
     int bits;
     disassemble_info *info;
{
  int val = 0;

  switch (code)
    {
    case '/': /* MAC/EMAC mask bit.  */
      val = buffer[3] >> 5;
      break;

    case 'G': /* EMAC ACC load.  */
      val = ((buffer[3] >> 3) & 0x2) | ((~buffer[1] >> 7) & 0x1);
      break;

    case 'H': /* EMAC ACC !load.  */
      val = ((buffer[3] >> 3) & 0x2) | ((buffer[1] >> 7) & 0x1);
      break;

    case ']': /* EMAC ACCEXT bit.  */
      val = buffer[0] >> 2;
      break;

    case 'I': /* MAC/EMAC scale factor.  */
      val = buffer[2] >> 1;
      break;

    case 'F': /* EMAC ACCx.  */
      val = buffer[0] >> 1;
      break;

    case 'f':
      val = buffer[1];
      break;

    case 's':
      val = buffer[1];
      break;

    case 'd':     /* Destination, for register or quick.  */
      val = (buffer[0] << 8) + buffer[1];
      val >>= 9;
      break;

    case 'x':     /* Destination, for general arg */
      val = (buffer[0] << 8) + buffer[1];
      val >>= 6;
      break;

    case 'k':
      FETCH_DATA (info, buffer + 3);
      val = (buffer[3] >> 4);
      break;

    case 'C':
      FETCH_DATA (info, buffer + 3);
      val = buffer[3];
      break;

    case '1':
      FETCH_DATA (info, buffer + 3);
      val = (buffer[2] << 8) + buffer[3];
      val >>= 12;
      break;

    case '2':
      FETCH_DATA (info, buffer + 3);
      val = (buffer[2] << 8) + buffer[3];
      val >>= 6;
      break;

    case '3':
    case 'j':
      FETCH_DATA (info, buffer + 3);
      val = (buffer[2] << 8) + buffer[3];
      break;

    case '4':
      FETCH_DATA (info, buffer + 5);
      val = (buffer[4] << 8) + buffer[5];
      val >>= 12;
      break;

    case '5':
      FETCH_DATA (info, buffer + 5);
      val = (buffer[4] << 8) + buffer[5];
      val >>= 6;
      break;

    case '6':
      FETCH_DATA (info, buffer + 5);
      val = (buffer[4] << 8) + buffer[5];
      break;

    case '7':
      FETCH_DATA (info, buffer + 3);
      val = (buffer[2] << 8) + buffer[3];
      val >>= 7;
      break;

    case '8':
      FETCH_DATA (info, buffer + 3);
      val = (buffer[2] << 8) + buffer[3];
      val >>= 10;
      break;

    case '9':
      FETCH_DATA (info, buffer + 3);
      val = (buffer[2] << 8) + buffer[3];
      val >>= 5;
      break;

    case 'e':
      val = (buffer[1] >> 6);
      break;

    case 'm':
      val = (buffer[1] & 0x40 ? 0x8 : 0)
  | ((buffer[0] >> 1) & 0x7)
  | (buffer[3] & 0x80 ? 0x10 : 0);
      break;

    case 'n':
      val = (buffer[1] & 0x40 ? 0x8 : 0) | ((buffer[0] >> 1) & 0x7);
      break;

    case 'o':
      val = (buffer[2] >> 4) | (buffer[3] & 0x80 ? 0x10 : 0);
      break;

    case 'M':
      val = (buffer[1] & 0xf) | (buffer[3] & 0x40 ? 0x10 : 0);
      break;

    case 'N':
      val = (buffer[3] & 0xf) | (buffer[3] & 0x40 ? 0x10 : 0);
      break;

    case 'h':
      val = buffer[2] >> 2;
      break;

    default:
      abort ();
    }

  switch (bits)
    {
    case 1:
      return val & 1;
    case 2:
      return val & 3;
    case 3:
      return val & 7;
    case 4:
      return val & 017;
    case 5:
      return val & 037;
    case 6:
      return val & 077;
    case 7:
      return val & 0177;
    case 8:
      return val & 0377;
    case 12:
      return val & 07777;
    default:
      abort ();
    }
}

/* Print an indexed argument.  The base register is BASEREG (-1 for pc).
   P points to extension word, in buffer.
   ADDR is the nominal core address of that extension word.  */

static unsigned char *
print_indexed (basereg, p, addr, info)
     int basereg;
     unsigned char *p;
     bfd_vma addr;
     disassemble_info *info;
{
  int word;
  static char *const scales[] = { "", ":2", ":4", ":8" };
  bfd_vma base_disp;
  bfd_vma outer_disp;
  char buf[40];
  char vmabuf[50];

  word = NEXTWORD (p);

  /* Generate the text for the index register.
     Where this will be output is not yet determined.  */
  sprintf (buf, "%s:%c%s",
     reg_names[(word >> 12) & 0xf],
     (word & 0x800) ? 'l' : 'w',
     scales[(word >> 9) & 3]);

  /* Handle the 68000 style of indexing.  */

  if ((word & 0x100) == 0)
    {
      base_disp = word & 0xff;
      if ((base_disp & 0x80) != 0)
  base_disp -= 0x100;
      if (basereg == -1)
  base_disp += addr;
      print_base (basereg, base_disp, info);
      (*info->fprintf_func) (info->stream, ",%s)", buf);
      return p;
    }

  /* Handle the generalized kind.  */
  /* First, compute the displacement to add to the base register.  */

  if (word & 0200)
    {
      if (basereg == -1)
  basereg = -3;
      else
  basereg = -2;
    }
  if (word & 0100)
    buf[0] = '\0';
  base_disp = 0;
  switch ((word >> 4) & 3)
    {
    case 2:
      base_disp = NEXTWORD (p);
      break;
    case 3:
      base_disp = NEXTLONG (p);
    }
  if (basereg == -1)
    base_disp += addr;

  /* Handle single-level case (not indirect) */

  if ((word & 7) == 0)
    {
      print_base (basereg, base_disp, info);
      if (buf[0] != '\0')
  (*info->fprintf_func) (info->stream, ",%s", buf);
      (*info->fprintf_func) (info->stream, ")");
      return p;
    }

  /* Two level.  Compute displacement to add after indirection.  */

  outer_disp = 0;
  switch (word & 3)
    {
    case 2:
      outer_disp = NEXTWORD (p);
      break;
    case 3:
      outer_disp = NEXTLONG (p);
    }

  print_base (basereg, base_disp, info);
  if ((word & 4) == 0 && buf[0] != '\0')
    {
      (*info->fprintf_func) (info->stream, ",%s", buf);
      buf[0] = '\0';
    }
  sprintf_vma (vmabuf, outer_disp);
  (*info->fprintf_func) (info->stream, ")@(%s", vmabuf);
  if (buf[0] != '\0')
    (*info->fprintf_func) (info->stream, ",%s", buf);
  (*info->fprintf_func) (info->stream, ")");

  return p;
}

/* Print a base register REGNO and displacement DISP, on INFO->STREAM.
   REGNO = -1 for pc, -2 for none (suppressed).  */

static void
print_base (regno, disp, info)
     int regno;
     bfd_vma disp;
     disassemble_info *info;
{
  if (regno == -1)
    {
      (*info->fprintf_func) (info->stream, "%%pc@(");
      (*info->print_address_func) (disp, info);
    }
  else
    {
      char buf[50];

      if (regno == -2)
  (*info->fprintf_func) (info->stream, "@(");
      else if (regno == -3)
  (*info->fprintf_func) (info->stream, "%%zpc@(");
      else
  (*info->fprintf_func) (info->stream, "%s@(", reg_names[regno]);

      sprintf_vma (buf, disp);
      (*info->fprintf_func) (info->stream, "%s", buf);
    }
}

---