Archipelago » qemu

/* This file is composed of several different files from the upstream

   sourceware.org CVS.  Original file boundaries marked with **** */

#include <string.h>

#include <math.h>

#include <stdio.h>

#include "dis-asm.h"

/* **** floatformat.h from sourceware.org CVS 2005-08-14.  */

/* IEEE floating point support declarations, for GDB, the GNU Debugger.

   Copyright 1991, 1994, 1995, 1997, 2000, 2003 Free Software Foundation, Inc.

This file is part of GDB.

This program 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, see <http://www.gnu.org/licenses/>.  */

#if !defined (FLOATFORMAT_H)

#define FLOATFORMAT_H 1

/*#include "ansidecl.h" */

/* A floatformat consists of a sign bit, an exponent and a mantissa.  Once the

   bytes are concatenated according to the byteorder flag, then each of those

   fields is contiguous.  We number the bits with 0 being the most significant

   (i.e. BITS_BIG_ENDIAN type numbering), and specify which bits each field

   contains with the *_start and *_len fields.  */

/* What is the order of the bytes. */

enum floatformat_byteorders {

  /* Standard little endian byte order.

     EX: 1.2345678e10 => 00 00 80 c5 e0 fe 06 42 */

  floatformat_little,

  /* Standard big endian byte order.

     EX: 1.2345678e10 => 42 06 fe e0 c5 80 00 00 */

  floatformat_big,

  /* Little endian byte order but big endian word order.

     EX: 1.2345678e10 => e0 fe 06 42 00 00 80 c5 */

  floatformat_littlebyte_bigword

};

enum floatformat_intbit { floatformat_intbit_yes, floatformat_intbit_no };

struct floatformat

{

  enum floatformat_byteorders byteorder;

  unsigned int totalsize;        /* Total size of number in bits */

  /* Sign bit is always one bit long.  1 means negative, 0 means positive.  */

  unsigned int sign_start;

  unsigned int exp_start;

  unsigned int exp_len;

  /* Bias added to a "true" exponent to form the biased exponent.  It

     is intentionally signed as, otherwize, -exp_bias can turn into a

     very large number (e.g., given the exp_bias of 0x3fff and a 64

     bit long, the equation (long)(1 - exp_bias) evaluates to

     4294950914) instead of -16382).  */

  int exp_bias;

  /* Exponent value which indicates NaN.  This is the actual value stored in

     the float, not adjusted by the exp_bias.  This usually consists of all

     one bits.  */

  unsigned int exp_nan;

  unsigned int man_start;

  unsigned int man_len;

  /* Is the integer bit explicit or implicit?  */

  enum floatformat_intbit intbit;

  /* Internal name for debugging. */

  const char *name;

  /* Validator method.  */

  int (*is_valid) (const struct floatformat *fmt, const char *from);

};

/* floatformats for IEEE single and double, big and little endian.  */

extern const struct floatformat floatformat_ieee_single_big;

extern const struct floatformat floatformat_ieee_single_little;

extern const struct floatformat floatformat_ieee_double_big;

extern const struct floatformat floatformat_ieee_double_little;

/* floatformat for ARM IEEE double, little endian bytes and big endian words */

extern const struct floatformat floatformat_ieee_double_littlebyte_bigword;

/* floatformats for various extendeds.  */

extern const struct floatformat floatformat_i387_ext;

extern const struct floatformat floatformat_m68881_ext;

extern const struct floatformat floatformat_i960_ext;

extern const struct floatformat floatformat_m88110_ext;

extern const struct floatformat floatformat_m88110_harris_ext;

extern const struct floatformat floatformat_arm_ext_big;

extern const struct floatformat floatformat_arm_ext_littlebyte_bigword;

/* IA-64 Floating Point register spilt into memory.  */

extern const struct floatformat floatformat_ia64_spill_big;

extern const struct floatformat floatformat_ia64_spill_little;

extern const struct floatformat floatformat_ia64_quad_big;

extern const struct floatformat floatformat_ia64_quad_little;

/* Convert from FMT to a double.

   FROM is the address of the extended float.

   Store the double in *TO.  */

extern void

floatformat_to_double (const struct floatformat *, const char *, double *);

/* The converse: convert the double *FROM to FMT

   and store where TO points.  */

extern void

floatformat_from_double (const struct floatformat *, const double *, char *);

/* Return non-zero iff the data at FROM is a valid number in format FMT.  */

extern int

floatformat_is_valid (const struct floatformat *fmt, const char *from);

#endif        /* defined (FLOATFORMAT_H) */

/* **** End of floatformat.h */

/* **** m68k-dis.h from sourceware.org CVS 2005-08-14.  */

/* Opcode table header for m680[01234]0/m6888[12]/m68851.

   Copyright 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1999, 2001,

   2003, 2004 Free Software Foundation, Inc.

   This file is part of GDB, GAS, and the GNU binutils.

   GDB, GAS, and the GNU binutils are free software; you can redistribute

   them and/or modify them under the terms of the GNU General Public

   License as published by the Free Software Foundation; either version

   1, or (at your option) any later version.

   GDB, GAS, and the GNU binutils are distributed in the hope that they

   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 file; see the file COPYING.  If not,

   see <http://www.gnu.org/licenses/>.  */

/* These are used as bit flags for the arch field in the m68k_opcode

   structure.  */

#define        _m68k_undef  0

#define        m68000   0x001

#define        m68008   m68000 /* Synonym for -m68000.  otherwise unused.  */

#define        m68010   0x002

#define        m68020   0x004

#define        m68030   0x008

#define m68ec030 m68030 /* Similar enough to -m68030 to ignore differences;

                           gas will deal with the few differences.  */

#define        m68040   0x010

/* There is no 68050.  */

#define m68060   0x020

#define        m68881   0x040

#define        m68882   m68881 /* Synonym for -m68881.  otherwise unused.  */

#define        m68851   0x080

#define cpu32         0x100                /* e.g., 68332 */

#define mcfmac   0x200                /* ColdFire MAC. */

#define mcfemac  0x400                /* ColdFire EMAC. */

#define cfloat   0x800                /* ColdFire FPU.  */

#define mcfhwdiv 0x1000                /* ColdFire hardware divide.  */

#define mcfisa_a 0x2000                /* ColdFire ISA_A.  */

#define mcfisa_aa 0x4000        /* ColdFire ISA_A+.  */

#define mcfisa_b 0x8000                /* ColdFire ISA_B.  */

#define mcfusp   0x10000        /* ColdFire USP instructions.  */

#define mcf5200  0x20000

#define mcf5206e 0x40000

#define mcf521x  0x80000

#define mcf5249  0x100000

#define mcf528x  0x200000

#define mcf5307  0x400000

#define mcf5407  0x800000

#define mcf5470  0x1000000

#define mcf5480  0x2000000

 /* Handy aliases.  */

#define        m68040up   (m68040 | m68060)

#define        m68030up   (m68030 | m68040up)

#define        m68020up   (m68020 | m68030up)

#define        m68010up   (m68010 | cpu32 | m68020up)

#define        m68000up   (m68000 | m68010up)

#define        mfloat  (m68881 | m68882 | m68040 | m68060)

#define        mmmu    (m68851 | m68030 | m68040 | m68060)

/* The structure used to hold information for an opcode.  */

struct m68k_opcode

{

  /* The opcode name.  */

  const char *name;

  /* The pseudo-size of the instruction(in bytes).  Used to determine

     number of bytes necessary to disassemble the instruction.  */

  unsigned int size;

  /* The opcode itself.  */

  unsigned long opcode;

  /* The mask used by the disassembler.  */

  unsigned long match;

  /* The arguments.  */

  const char *args;

  /* The architectures which support this opcode.  */

  unsigned int arch;

};

/* The structure used to hold information for an opcode alias.  */

struct m68k_opcode_alias

{

  /* The alias name.  */

  const char *alias;

  /* The instruction for which this is an alias.  */

  const char *primary;

};

/* We store four bytes of opcode for all opcodes because that is the

   most any of them need.  The actual length of an instruction is

   always at least 2 bytes, and is as much longer as necessary to hold

   the operands it has.

   The match field is a mask saying which bits must match particular

   opcode in order for an instruction to be an instance of that

   opcode.

   The args field is a string containing two characters for each

   operand of the instruction.  The first specifies the kind of

   operand; the second, the place it is stored.  */

/* Kinds of operands:

   Characters used: AaBbCcDdEeFfGgHIiJkLlMmnOopQqRrSsTtU VvWwXxYyZz01234|*~%;@!&$?/<>#^+-

   D  data register only.  Stored as 3 bits.

   A  address register only.  Stored as 3 bits.

   a  address register indirect only.  Stored as 3 bits.

   R  either kind of register.  Stored as 4 bits.

   r  either kind of register indirect only.  Stored as 4 bits.

      At the moment, used only for cas2 instruction.

   F  floating point coprocessor register only.   Stored as 3 bits.

   O  an offset (or width): immediate data 0-31 or data register.

      Stored as 6 bits in special format for BF... insns.

   +  autoincrement only.  Stored as 3 bits (number of the address register).

   -  autodecrement only.  Stored as 3 bits (number of the address register).

   Q  quick immediate data.  Stored as 3 bits.

      This matches an immediate operand only when value is in range 1 .. 8.

   M  moveq immediate data.  Stored as 8 bits.

      This matches an immediate operand only when value is in range -128..127

   T  trap vector immediate data.  Stored as 4 bits.

   k  K-factor for fmove.p instruction.   Stored as a 7-bit constant or

      a three bit register offset, depending on the field type.

   #  immediate data.  Stored in special places (b, w or l)

      which say how many bits to store.

   ^  immediate data for floating point instructions.   Special places

      are offset by 2 bytes from '#'...

   B  pc-relative address, converted to an offset

      that is treated as immediate data.

   d  displacement and register.  Stores the register as 3 bits

      and stores the displacement in the entire second word.

   C  the CCR.  No need to store it; this is just for filtering validity.

   S  the SR.  No need to store, just as with CCR.

   U  the USP.  No need to store, just as with CCR.

   E  the MAC ACC.  No need to store, just as with CCR.

   e  the EMAC ACC[0123].

   G  the MAC/EMAC MACSR.  No need to store, just as with CCR.

   g  the EMAC ACCEXT{01,23}.

   H  the MASK.  No need to store, just as with CCR.

   i  the MAC/EMAC scale factor.

   I  Coprocessor ID.   Not printed if 1.   The Coprocessor ID is always

      extracted from the 'd' field of word one, which means that an extended

      coprocessor opcode can be skipped using the 'i' place, if needed.

   s  System Control register for the floating point coprocessor.

   J  Misc register for movec instruction, stored in 'j' format.

        Possible values:

        0x000        SFC        Source Function Code reg        [60, 40, 30, 20, 10]

        0x001        DFC        Data Function Code reg                [60, 40, 30, 20, 10]

        0x002   CACR    Cache Control Register          [60, 40, 30, 20, mcf]

        0x003        TC        MMU Translation Control                [60, 40]

        0x004        ITT0        Instruction Transparent

                                Translation reg 0        [60, 40]

        0x005        ITT1        Instruction Transparent

                                Translation reg 1        [60, 40]

        0x006        DTT0        Data Transparent

                                Translation reg 0        [60, 40]

        0x007        DTT1        Data Transparent

                                Translation reg 1        [60, 40]

        0x008        BUSCR        Bus Control Register                [60]

        0x800        USP        User Stack Pointer                [60, 40, 30, 20, 10]

        0x801   VBR     Vector Base reg                 [60, 40, 30, 20, 10, mcf]

        0x802        CAAR        Cache Address Register                [        30, 20]

        0x803        MSP        Master Stack Pointer                [    40, 30, 20]

        0x804        ISP        Interrupt Stack Pointer                [    40, 30, 20]

        0x805        MMUSR        MMU Status reg                        [    40]

        0x806        URP        User Root Pointer                [60, 40]

        0x807        SRP        Supervisor Root Pointer                [60, 40]

        0x808        PCR        Processor Configuration reg        [60]

        0xC00        ROMBAR        ROM Base Address Register        [520X]

        0xC04        RAMBAR0        RAM Base Address Register 0        [520X]

        0xC05        RAMBAR1        RAM Base Address Register 0        [520X]

        0xC0F        MBAR0        RAM Base Address Register 0        [520X]

        0xC04   FLASHBAR FLASH Base Address Register    [mcf528x]

        0xC05   RAMBAR  Static RAM Base Address Register [mcf528x]

    L  Register list of the type d0-d7/a0-a7 etc.

       (New!  Improved!  Can also hold fp0-fp7, as well!)

       The assembler tries to see if the registers match the insn by

       looking at where the insn wants them stored.

    l  Register list like L, but with all the bits reversed.

       Used for going the other way. . .

    c  cache identifier which may be "nc" for no cache, "ic"

       for instruction cache, "dc" for data cache, or "bc"

       for both caches.  Used in cinv and cpush.  Always

       stored in position "d".

    u  Any register, with ``upper'' or ``lower'' specification.  Used

       in the mac instructions with size word.

 The remainder are all stored as 6 bits using an address mode and a

 register number; they differ in which addressing modes they match.

   *  all                                        (modes 0-6,7.0-4)

   ~  alterable memory                                (modes 2-6,7.0,7.1)

                                                   (not 0,1,7.2-4)

   %  alterable                                        (modes 0-6,7.0,7.1)

                                                (not 7.2-4)

   ;  data                                        (modes 0,2-6,7.0-4)

                                                (not 1)

   @  data, but not immediate                        (modes 0,2-6,7.0-3)

                                                (not 1,7.4)

   !  control                                        (modes 2,5,6,7.0-3)

                                                (not 0,1,3,4,7.4)

   &  alterable control                                (modes 2,5,6,7.0,7.1)

                                                (not 0,1,3,4,7.2-4)

   $  alterable data                                (modes 0,2-6,7.0,7.1)

                                                (not 1,7.2-4)

   ?  alterable control, or data register        (modes 0,2,5,6,7.0,7.1)

                                                (not 1,3,4,7.2-4)

   /  control, or data register                        (modes 0,2,5,6,7.0-3)

                                                (not 1,3,4,7.4)

   >  *save operands                                (modes 2,4,5,6,7.0,7.1)

                                                (not 0,1,3,7.2-4)

   <  *restore operands                                (modes 2,3,5,6,7.0-3)

                                                (not 0,1,4,7.4)

   coldfire move operands:

   m                                                  (modes 0-4)

   n                                                (modes 5,7.2)

   o                                                (modes 6,7.0,7.1,7.3,7.4)

   p                                                (modes 0-5)

   coldfire bset/bclr/btst/mulsl/mulul operands:

   q                                                (modes 0,2-5)

   v                                                (modes 0,2-5,7.0,7.1)

   b                                            (modes 0,2-5,7.2)

   w                                            (modes 2-5,7.2)

   y                                                (modes 2,5)

   z                                                (modes 2,5,7.2)

   x  mov3q immediate operand.

   4                                                (modes 2,3,4,5)

  */

/* For the 68851:  */

/* I didn't use much imagination in choosing the

   following codes, so many of them aren't very

   mnemonic. -rab

   0  32 bit pmmu register

        Possible values:

        000        TC        Translation Control Register (68030, 68851)

   1  16 bit pmmu register

        111        AC        Access Control (68851)

   2  8 bit pmmu register

        100        CAL        Current Access Level (68851)

        101        VAL        Validate Access Level (68851)

        110        SCC        Stack Change Control (68851)

   3  68030-only pmmu registers (32 bit)

        010        TT0        Transparent Translation reg 0

                        (aka Access Control reg 0 -- AC0 -- on 68ec030)

        011        TT1        Transparent Translation reg 1

                        (aka Access Control reg 1 -- AC1 -- on 68ec030)

   W  wide pmmu registers

        Possible values:

        001        DRP        Dma Root Pointer (68851)

        010        SRP        Supervisor Root Pointer (68030, 68851)

        011        CRP        Cpu Root Pointer (68030, 68851)

   f        function code register (68030, 68851)

        0        SFC

        1        DFC

   V        VAL register only (68851)

   X        BADx, BACx (16 bit)

        100        BAD        Breakpoint Acknowledge Data (68851)

        101        BAC        Breakpoint Acknowledge Control (68851)

   Y        PSR (68851) (MMUSR on 68030) (ACUSR on 68ec030)

   Z        PCSR (68851)

   |        memory                 (modes 2-6, 7.*)

   t  address test level (68030 only)

      Stored as 3 bits, range 0-7.

      Also used for breakpoint instruction now.

*/

/* Places to put an operand, for non-general operands:

   Characters used: BbCcDdFfGgHhIijkLlMmNnostWw123456789/

   s  source, low bits of first word.

   d  dest, shifted 9 in first word

   1  second word, shifted 12

   2  second word, shifted 6

   3  second word, shifted 0

   4  third word, shifted 12

   5  third word, shifted 6

   6  third word, shifted 0

   7  second word, shifted 7

   8  second word, shifted 10

   9  second word, shifted 5

   D  store in both place 1 and place 3; for divul and divsl.

   B  first word, low byte, for branch displacements

   W  second word (entire), for branch displacements

   L  second and third words (entire), for branch displacements

      (also overloaded for move16)

   b  second word, low byte

   w  second word (entire) [variable word/long branch offset for dbra]

   W  second word (entire) (must be signed 16 bit value)

   l  second and third word (entire)

   g  variable branch offset for bra and similar instructions.

      The place to store depends on the magnitude of offset.

   t  store in both place 7 and place 8; for floating point operations

   c  branch offset for cpBcc operations.

      The place to store is word two if bit six of word one is zero,

      and words two and three if bit six of word one is one.

   i  Increment by two, to skip over coprocessor extended operands.   Only

      works with the 'I' format.

   k  Dynamic K-factor field.   Bits 6-4 of word 2, used as a register number.

      Also used for dynamic fmovem instruction.

   C  floating point coprocessor constant - 7 bits.  Also used for static

      K-factors...

   j  Movec register #, stored in 12 low bits of second word.

   m  For M[S]ACx; 4 bits split with MSB shifted 6 bits in first word

      and remaining 3 bits of register shifted 9 bits in first word.

      Indicate upper/lower in 1 bit shifted 7 bits in second word.

      Use with `R' or `u' format.

   n  `m' withouth upper/lower indication. (For M[S]ACx; 4 bits split

      with MSB shifted 6 bits in first word and remaining 3 bits of

      register shifted 9 bits in first word.  No upper/lower

      indication is done.)  Use with `R' or `u' format.

   o  For M[S]ACw; 4 bits shifted 12 in second word (like `1').

      Indicate upper/lower in 1 bit shifted 7 bits in second word.

      Use with `R' or `u' format.

   M  For M[S]ACw; 4 bits in low bits of first word.  Indicate

      upper/lower in 1 bit shifted 6 bits in second word.  Use with

      `R' or `u' format.

   N  For M[S]ACw; 4 bits in low bits of second word.  Indicate

      upper/lower in 1 bit shifted 6 bits in second word.  Use with

      `R' or `u' format.

   h  shift indicator (scale factor), 1 bit shifted 10 in second word

 Places to put operand, for general operands:

   d  destination, shifted 6 bits in first word

   b  source, at low bit of first word, and immediate uses one byte

   w  source, at low bit of first word, and immediate uses two bytes

   l  source, at low bit of first word, and immediate uses four bytes

   s  source, at low bit of first word.

      Used sometimes in contexts where immediate is not allowed anyway.

   f  single precision float, low bit of 1st word, immediate uses 4 bytes

   F  double precision float, low bit of 1st word, immediate uses 8 bytes

   x  extended precision float, low bit of 1st word, immediate uses 12 bytes

   p  packed float, low bit of 1st word, immediate uses 12 bytes

   G  EMAC accumulator, load  (bit 4 2nd word, !bit8 first word)

   H  EMAC accumulator, non load  (bit 4 2nd word, bit 8 first word)

   F  EMAC ACCx

   f  EMAC ACCy

   I  MAC/EMAC scale factor

   /  Like 's', but set 2nd word, bit 5 if trailing_ampersand set

   ]  first word, bit 10

*/

extern const struct m68k_opcode m68k_opcodes[];

extern const struct m68k_opcode_alias m68k_opcode_aliases[];

extern const int m68k_numopcodes, m68k_numaliases;

/* **** End of m68k-opcode.h */

/* **** m68k-dis.c from sourceware.org CVS 2005-08-14.  */

/* Print Motorola 68k instructions.

   Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997,

   1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005

   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, see <http://www.gnu.org/licenses/>.  */

/* Local function prototypes.  */

static const char * const fpcr_names[] =

{

  "", "%fpiar", "%fpsr", "%fpiar/%fpsr", "%fpcr",

  "%fpiar/%fpcr", "%fpsr/%fpcr", "%fpiar/%fpsr/%fpcr"

};

static const 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.

   Separate from reg_names since 'spu', 'fpl' look weird.  */

static const 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.  */

static int

fetch_data2(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;

}

static int

fetch_data(struct disassemble_info *info, bfd_byte *addr)

{

    if (addr <= ((struct private *) (info->private_data))->max_fetched) {

        return 1;

    } else {

        return fetch_data2(info, addr);

    }

}

/* This function is used to print to the bit-bucket.  */

static int

dummy_printer (FILE *file ATTRIBUTE_UNUSED,

               const char *format ATTRIBUTE_UNUSED,

               ...)

{

  return 0;

}

static void

dummy_print_address (bfd_vma vma ATTRIBUTE_UNUSED,

                     struct disassemble_info *info ATTRIBUTE_UNUSED)

{

}

/* 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 (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: