binutils-gdb/opcodes/frv-dis.c

/* Disassembler interface for targets using CGEN. -*- C -*-
   CGEN: Cpu tools GENerator

THIS FILE IS MACHINE GENERATED WITH CGEN.
- the resultant file is machine generated, cgen-dis.in isn't

Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002
Free Software Foundation, Inc.

This file is part of the GNU Binutils and GDB, the GNU debugger.

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, 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.  */

/* ??? Eventually more and more of this stuff can go to cpu-independent files.
   Keep that in mind.  */

#include "sysdep.h"
#include <stdio.h>
#include "ansidecl.h"
#include "dis-asm.h"
#include "bfd.h"
#include "symcat.h"
#include "libiberty.h"
#include "frv-desc.h"
#include "frv-opc.h"
#include "opintl.h"

/* Default text to print if an instruction isn't recognized.  */
#define UNKNOWN_INSN_MSG _("*unknown*")

static void print_normal
  (CGEN_CPU_DESC, void *, long, unsigned int, bfd_vma, int);
static void print_address
  (CGEN_CPU_DESC, void *, bfd_vma, unsigned int, bfd_vma, int);
static void print_keyword
  (CGEN_CPU_DESC, void *, CGEN_KEYWORD *, long, unsigned int);
static void print_insn_normal
  (CGEN_CPU_DESC, void *, const CGEN_INSN *, CGEN_FIELDS *, bfd_vma, int);
static int print_insn
  (CGEN_CPU_DESC, bfd_vma,  disassemble_info *, char *, unsigned);
static int default_print_insn
  (CGEN_CPU_DESC, bfd_vma, disassemble_info *);
static int read_insn
  (CGEN_CPU_DESC, bfd_vma, disassemble_info *, char *, int, CGEN_EXTRACT_INFO *,
   unsigned long *);

/* -- disassembler routines inserted here */

/* -- dis.c */
static void print_spr
  PARAMS ((CGEN_CPU_DESC, PTR, CGEN_KEYWORD *, long, unsigned));
static void print_hi
  PARAMS ((CGEN_CPU_DESC, PTR, long, unsigned, bfd_vma, int));
static void print_lo
  PARAMS ((CGEN_CPU_DESC, PTR, long, unsigned, bfd_vma, int));

static void
print_at (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
	  PTR dis_info,
	  CGEN_KEYWORD *names ATTRIBUTE_UNUSED,
	  long value ATTRIBUTE_UNUSED,
	  bfd_vma pc ATTRIBUTE_UNUSED,
	  int length ATTRIBUTE_UNUSED
	  )
{
  disassemble_info *info = (disassemble_info *) dis_info;
  (*info->fprintf_func) (info->stream, "@");
}  

static void
print_spr (cd, dis_info, names, regno, attrs)
     CGEN_CPU_DESC cd;
     PTR dis_info;
     CGEN_KEYWORD *names;
     long regno;
     unsigned int attrs;
{
  /* Use the register index format for any unnamed registers.  */
  if (cgen_keyword_lookup_value (names, regno) == NULL)
    {
      disassemble_info *info = (disassemble_info *) dis_info;
      (*info->fprintf_func) (info->stream, "spr[%ld]", regno);
    }
  else
    print_keyword (cd, dis_info, names, regno, attrs);
}

static void
print_hi (cd, dis_info, value, attrs, pc, length)
     CGEN_CPU_DESC cd ATTRIBUTE_UNUSED;
     PTR dis_info;
     long value;
     unsigned int attrs ATTRIBUTE_UNUSED;
     bfd_vma pc ATTRIBUTE_UNUSED;
     int length ATTRIBUTE_UNUSED;
{
  disassemble_info *info = (disassemble_info *) dis_info;
  if (value)
    (*info->fprintf_func) (info->stream, "0x%lx", value);
  else
    (*info->fprintf_func) (info->stream, "hi(0x%lx)", value);
}

static void
print_lo (cd, dis_info, value, attrs, pc, length)
     CGEN_CPU_DESC cd ATTRIBUTE_UNUSED;
     PTR dis_info;
     long value;
     unsigned int attrs ATTRIBUTE_UNUSED;
     bfd_vma pc ATTRIBUTE_UNUSED;
     int length ATTRIBUTE_UNUSED;
{
  disassemble_info *info = (disassemble_info *) dis_info;
  if (value)
    (*info->fprintf_func) (info->stream, "0x%lx", value);
  else
    (*info->fprintf_func) (info->stream, "lo(0x%lx)", value);
}

/* -- */

void frv_cgen_print_operand
  PARAMS ((CGEN_CPU_DESC, int, PTR, CGEN_FIELDS *,
           void const *, bfd_vma, int));

/* Main entry point for printing operands.
   XINFO is a `void *' and not a `disassemble_info *' to not put a requirement
   of dis-asm.h on cgen.h.

   This function is basically just a big switch statement.  Earlier versions
   used tables to look up the function to use, but
   - if the table contains both assembler and disassembler functions then
     the disassembler contains much of the assembler and vice-versa,
   - there's a lot of inlining possibilities as things grow,
   - using a switch statement avoids the function call overhead.

   This function could be moved into `print_insn_normal', but keeping it
   separate makes clear the interface between `print_insn_normal' and each of
   the handlers.  */

void
frv_cgen_print_operand (cd, opindex, xinfo, fields, attrs, pc, length)
     CGEN_CPU_DESC cd;
     int opindex;
     PTR xinfo;
     CGEN_FIELDS *fields;
     void const *attrs ATTRIBUTE_UNUSED;
     bfd_vma pc;
     int length;
{
 disassemble_info *info = (disassemble_info *) xinfo;

  switch (opindex)
    {
    case FRV_OPERAND_A0 :
      print_normal (cd, info, fields->f_A, 0, pc, length);
      break;
    case FRV_OPERAND_A1 :
      print_normal (cd, info, fields->f_A, 0, pc, length);
      break;
    case FRV_OPERAND_ACC40SI :
      print_keyword (cd, info, & frv_cgen_opval_acc_names, fields->f_ACC40Si, 0);
      break;
    case FRV_OPERAND_ACC40SK :
      print_keyword (cd, info, & frv_cgen_opval_acc_names, fields->f_ACC40Sk, 0);
      break;
    case FRV_OPERAND_ACC40UI :
      print_keyword (cd, info, & frv_cgen_opval_acc_names, fields->f_ACC40Ui, 0);
      break;
    case FRV_OPERAND_ACC40UK :
      print_keyword (cd, info, & frv_cgen_opval_acc_names, fields->f_ACC40Uk, 0);
      break;
    case FRV_OPERAND_ACCGI :
      print_keyword (cd, info, & frv_cgen_opval_accg_names, fields->f_ACCGi, 0);
      break;
    case FRV_OPERAND_ACCGK :
      print_keyword (cd, info, & frv_cgen_opval_accg_names, fields->f_ACCGk, 0);
      break;
    case FRV_OPERAND_CCI :
      print_keyword (cd, info, & frv_cgen_opval_cccr_names, fields->f_CCi, 0);
      break;
    case FRV_OPERAND_CPRDOUBLEK :
      print_keyword (cd, info, & frv_cgen_opval_cpr_names, fields->f_CPRk, 0);
      break;
    case FRV_OPERAND_CPRI :
      print_keyword (cd, info, & frv_cgen_opval_cpr_names, fields->f_CPRi, 0);
      break;
    case FRV_OPERAND_CPRJ :
      print_keyword (cd, info, & frv_cgen_opval_cpr_names, fields->f_CPRj, 0);
      break;
    case FRV_OPERAND_CPRK :
      print_keyword (cd, info, & frv_cgen_opval_cpr_names, fields->f_CPRk, 0);
      break;
    case FRV_OPERAND_CRI :
      print_keyword (cd, info, & frv_cgen_opval_cccr_names, fields->f_CRi, 0);
      break;
    case FRV_OPERAND_CRJ :
      print_keyword (cd, info, & frv_cgen_opval_cccr_names, fields->f_CRj, 0);
      break;
    case FRV_OPERAND_CRJ_FLOAT :
      print_keyword (cd, info, & frv_cgen_opval_cccr_names, fields->f_CRj_float, 0);
      break;
    case FRV_OPERAND_CRJ_INT :
      print_keyword (cd, info, & frv_cgen_opval_cccr_names, fields->f_CRj_int, 0);
      break;
    case FRV_OPERAND_CRK :
      print_keyword (cd, info, & frv_cgen_opval_cccr_names, fields->f_CRk, 0);
      break;
    case FRV_OPERAND_FCCI_1 :
      print_keyword (cd, info, & frv_cgen_opval_fccr_names, fields->f_FCCi_1, 0);
      break;
    case FRV_OPERAND_FCCI_2 :
      print_keyword (cd, info, & frv_cgen_opval_fccr_names, fields->f_FCCi_2, 0);
      break;
    case FRV_OPERAND_FCCI_3 :
      print_keyword (cd, info, & frv_cgen_opval_fccr_names, fields->f_FCCi_3, 0);
      break;
    case FRV_OPERAND_FCCK :
      print_keyword (cd, info, & frv_cgen_opval_fccr_names, fields->f_FCCk, 0);
      break;
    case FRV_OPERAND_FRDOUBLEI :
      print_keyword (cd, info, & frv_cgen_opval_fr_names, fields->f_FRi, 0);
      break;
    case FRV_OPERAND_FRDOUBLEJ :
      print_keyword (cd, info, & frv_cgen_opval_fr_names, fields->f_FRj, 0);
      break;
    case FRV_OPERAND_FRDOUBLEK :
      print_keyword (cd, info, & frv_cgen_opval_fr_names, fields->f_FRk, 0);
      break;
    case FRV_OPERAND_FRI :
      print_keyword (cd, info, & frv_cgen_opval_fr_names, fields->f_FRi, 0);
      break;
    case FRV_OPERAND_FRINTI :
      print_keyword (cd, info, & frv_cgen_opval_fr_names, fields->f_FRi, 0);
      break;
    case FRV_OPERAND_FRINTIEVEN :
      print_keyword (cd, info, & frv_cgen_opval_fr_names, fields->f_FRi, 0);
      break;
    case FRV_OPERAND_FRINTJ :
      print_keyword (cd, info, & frv_cgen_opval_fr_names, fields->f_FRj, 0);
      break;
    case FRV_OPERAND_FRINTJEVEN :
      print_keyword (cd, info, & frv_cgen_opval_fr_names, fields->f_FRj, 0);
      break;
    case FRV_OPERAND_FRINTK :
      print_keyword (cd, info, & frv_cgen_opval_fr_names, fields->f_FRk, 0);
      break;
    case FRV_OPERAND_FRINTKEVEN :
      print_keyword (cd, info, & frv_cgen_opval_fr_names, fields->f_FRk, 0);
      break;
    case FRV_OPERAND_FRJ :
      print_keyword (cd, info, & frv_cgen_opval_fr_names, fields->f_FRj, 0);
      break;
    case FRV_OPERAND_FRK :
      print_keyword (cd, info, & frv_cgen_opval_fr_names, fields->f_FRk, 0);
      break;
    case FRV_OPERAND_FRKHI :
      print_keyword (cd, info, & frv_cgen_opval_fr_names, fields->f_FRk, 0);
      break;
    case FRV_OPERAND_FRKLO :
      print_keyword (cd, info, & frv_cgen_opval_fr_names, fields->f_FRk, 0);
      break;
    case FRV_OPERAND_GRDOUBLEK :
      print_keyword (cd, info, & frv_cgen_opval_gr_names, fields->f_GRk, 0);
      break;
    case FRV_OPERAND_GRI :
      print_keyword (cd, info, & frv_cgen_opval_gr_names, fields->f_GRi, 0);
      break;
    case FRV_OPERAND_GRJ :
      print_keyword (cd, info, & frv_cgen_opval_gr_names, fields->f_GRj, 0);
      break;
    case FRV_OPERAND_GRK :
      print_keyword (cd, info, & frv_cgen_opval_gr_names, fields->f_GRk, 0);
      break;
    case FRV_OPERAND_GRKHI :
      print_keyword (cd, info, & frv_cgen_opval_gr_names, fields->f_GRk, 0);
      break;
    case FRV_OPERAND_GRKLO :
      print_keyword (cd, info, & frv_cgen_opval_gr_names, fields->f_GRk, 0);
      break;
    case FRV_OPERAND_ICCI_1 :
      print_keyword (cd, info, & frv_cgen_opval_iccr_names, fields->f_ICCi_1, 0);
      break;
    case FRV_OPERAND_ICCI_2 :
      print_keyword (cd, info, & frv_cgen_opval_iccr_names, fields->f_ICCi_2, 0);
      break;
    case FRV_OPERAND_ICCI_3 :
      print_keyword (cd, info, & frv_cgen_opval_iccr_names, fields->f_ICCi_3, 0);
      break;
    case FRV_OPERAND_LI :
      print_normal (cd, info, fields->f_LI, 0, pc, length);
      break;
    case FRV_OPERAND_LRAD :
      print_normal (cd, info, fields->f_LRAD, 0, pc, length);
      break;
    case FRV_OPERAND_LRAE :
      print_normal (cd, info, fields->f_LRAE, 0, pc, length);
      break;
    case FRV_OPERAND_LRAS :
      print_normal (cd, info, fields->f_LRAS, 0, pc, length);
      break;
    case FRV_OPERAND_TLBPRL :
      print_normal (cd, info, fields->f_TLBPRL, 0, pc, length);
      break;
    case FRV_OPERAND_TLBPROPX :
      print_normal (cd, info, fields->f_TLBPRopx, 0, pc, length);
      break;
    case FRV_OPERAND_AE :
      print_normal (cd, info, fields->f_ae, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
      break;
    case FRV_OPERAND_CALLANN :
      print_at (cd, info, fields->f_reloc_ann, 0, pc, length);
      break;
    case FRV_OPERAND_CCOND :
      print_normal (cd, info, fields->f_ccond, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
      break;
    case FRV_OPERAND_COND :
      print_normal (cd, info, fields->f_cond, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
      break;
    case FRV_OPERAND_D12 :
      print_normal (cd, info, fields->f_d12, 0|(1<<CGEN_OPERAND_SIGNED), pc, length);
      break;
    case FRV_OPERAND_DEBUG :
      print_normal (cd, info, fields->f_debug, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
      break;
    case FRV_OPERAND_EIR :
      print_normal (cd, info, fields->f_eir, 0, pc, length);
      break;
    case FRV_OPERAND_HINT :
      print_normal (cd, info, fields->f_hint, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
      break;
    case FRV_OPERAND_HINT_NOT_TAKEN :
      print_keyword (cd, info, & frv_cgen_opval_h_hint_not_taken, fields->f_hint, 0);
      break;
    case FRV_OPERAND_HINT_TAKEN :
      print_keyword (cd, info, & frv_cgen_opval_h_hint_taken, fields->f_hint, 0);
      break;
    case FRV_OPERAND_LABEL16 :
      print_address (cd, info, fields->f_label16, 0|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
      break;
    case FRV_OPERAND_LABEL24 :
      print_address (cd, info, fields->f_label24, 0|(1<<CGEN_OPERAND_PCREL_ADDR)|(1<<CGEN_OPERAND_VIRTUAL), pc, length);
      break;
    case FRV_OPERAND_LDANN :
      print_at (cd, info, fields->f_reloc_ann, 0, pc, length);
      break;
    case FRV_OPERAND_LDDANN :
      print_at (cd, info, fields->f_reloc_ann, 0, pc, length);
      break;
    case FRV_OPERAND_LOCK :
      print_normal (cd, info, fields->f_lock, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
      break;
    case FRV_OPERAND_PACK :
      print_keyword (cd, info, & frv_cgen_opval_h_pack, fields->f_pack, 0);
      break;
    case FRV_OPERAND_S10 :
      print_normal (cd, info, fields->f_s10, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
      break;
    case FRV_OPERAND_S12 :
      print_normal (cd, info, fields->f_d12, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
      break;
    case FRV_OPERAND_S16 :
      print_normal (cd, info, fields->f_s16, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
      break;
    case FRV_OPERAND_S5 :
      print_normal (cd, info, fields->f_s5, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
      break;
    case FRV_OPERAND_S6 :
      print_normal (cd, info, fields->f_s6, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
      break;
    case FRV_OPERAND_S6_1 :
      print_normal (cd, info, fields->f_s6_1, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
      break;
    case FRV_OPERAND_SLO16 :
      print_lo (cd, info, fields->f_s16, 0|(1<<CGEN_OPERAND_SIGNED), pc, length);
      break;
    case FRV_OPERAND_SPR :
      print_spr (cd, info, & frv_cgen_opval_spr_names, fields->f_spr, 0|(1<<CGEN_OPERAND_VIRTUAL));
      break;
    case FRV_OPERAND_U12 :
      print_normal (cd, info, fields->f_u12, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_HASH_PREFIX)|(1<<CGEN_OPERAND_VIRTUAL), pc, length);
      break;
    case FRV_OPERAND_U16 :
      print_normal (cd, info, fields->f_u16, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
      break;
    case FRV_OPERAND_U6 :
      print_normal (cd, info, fields->f_u6, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
      break;
    case FRV_OPERAND_UHI16 :
      print_hi (cd, info, fields->f_u16, 0, pc, length);
      break;
    case FRV_OPERAND_ULO16 :
      print_lo (cd, info, fields->f_u16, 0, pc, length);
      break;

    default :
      /* xgettext:c-format */
      fprintf (stderr, _("Unrecognized field %d while printing insn.\n"),
	       opindex);
    abort ();
  }
}

cgen_print_fn * const frv_cgen_print_handlers[] = 
{
  print_insn_normal,
};


void
frv_cgen_init_dis (cd)
     CGEN_CPU_DESC cd;
{
  frv_cgen_init_opcode_table (cd);
  frv_cgen_init_ibld_table (cd);
  cd->print_handlers = & frv_cgen_print_handlers[0];
  cd->print_operand = frv_cgen_print_operand;
}


/* Default print handler.  */

static void
print_normal (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
	      void *dis_info,
	      long value,
	      unsigned int attrs,
	      bfd_vma pc ATTRIBUTE_UNUSED,
	      int length ATTRIBUTE_UNUSED)
{
  disassemble_info *info = (disassemble_info *) dis_info;

#ifdef CGEN_PRINT_NORMAL
  CGEN_PRINT_NORMAL (cd, info, value, attrs, pc, length);
#endif

  /* Print the operand as directed by the attributes.  */
  if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
    ; /* nothing to do */
  else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
    (*info->fprintf_func) (info->stream, "%ld", value);
  else
    (*info->fprintf_func) (info->stream, "0x%lx", value);
}

/* Default address handler.  */

static void
print_address (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
	       void *dis_info,
	       bfd_vma value,
	       unsigned int attrs,
	       bfd_vma pc ATTRIBUTE_UNUSED,
	       int length ATTRIBUTE_UNUSED)
{
  disassemble_info *info = (disassemble_info *) dis_info;

#ifdef CGEN_PRINT_ADDRESS
  CGEN_PRINT_ADDRESS (cd, info, value, attrs, pc, length);
#endif

  /* Print the operand as directed by the attributes.  */
  if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
    ; /* nothing to do */
  else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_PCREL_ADDR))
    (*info->print_address_func) (value, info);
  else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_ABS_ADDR))
    (*info->print_address_func) (value, info);
  else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
    (*info->fprintf_func) (info->stream, "%ld", (long) value);
  else
    (*info->fprintf_func) (info->stream, "0x%lx", (long) value);
}

/* Keyword print handler.  */

static void
print_keyword (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
	       void *dis_info,
	       CGEN_KEYWORD *keyword_table,
	       long value,
	       unsigned int attrs ATTRIBUTE_UNUSED)
{
  disassemble_info *info = (disassemble_info *) dis_info;
  const CGEN_KEYWORD_ENTRY *ke;

  ke = cgen_keyword_lookup_value (keyword_table, value);
  if (ke != NULL)
    (*info->fprintf_func) (info->stream, "%s", ke->name);
  else
    (*info->fprintf_func) (info->stream, "???");
}

/* Default insn printer.

   DIS_INFO is defined as `void *' so the disassembler needn't know anything
   about disassemble_info.  */

static void
print_insn_normal (CGEN_CPU_DESC cd,
		   void *dis_info,
		   const CGEN_INSN *insn,
		   CGEN_FIELDS *fields,
		   bfd_vma pc,
		   int length)
{
  const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
  disassemble_info *info = (disassemble_info *) dis_info;
  const CGEN_SYNTAX_CHAR_TYPE *syn;

  CGEN_INIT_PRINT (cd);

  for (syn = CGEN_SYNTAX_STRING (syntax); *syn; ++syn)
    {
      if (CGEN_SYNTAX_MNEMONIC_P (*syn))
	{
	  (*info->fprintf_func) (info->stream, "%s", CGEN_INSN_MNEMONIC (insn));
	  continue;
	}
      if (CGEN_SYNTAX_CHAR_P (*syn))
	{
	  (*info->fprintf_func) (info->stream, "%c", CGEN_SYNTAX_CHAR (*syn));
	  continue;
	}

      /* We have an operand.  */
      frv_cgen_print_operand (cd, CGEN_SYNTAX_FIELD (*syn), info,
				 fields, CGEN_INSN_ATTRS (insn), pc, length);
    }
}

/* Subroutine of print_insn. Reads an insn into the given buffers and updates
   the extract info.
   Returns 0 if all is well, non-zero otherwise.  */

static int
read_insn (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
	   bfd_vma pc,
	   disassemble_info *info,
	   char *buf,
	   int buflen,
	   CGEN_EXTRACT_INFO *ex_info,
	   unsigned long *insn_value)
{
  int status = (*info->read_memory_func) (pc, buf, buflen, info);
  if (status != 0)
    {
      (*info->memory_error_func) (status, pc, info);
      return -1;
    }

  ex_info->dis_info = info;
  ex_info->valid = (1 << buflen) - 1;
  ex_info->insn_bytes = buf;

  *insn_value = bfd_get_bits (buf, buflen * 8, info->endian == BFD_ENDIAN_BIG);
  return 0;
}

/* Utility to print an insn.
   BUF is the base part of the insn, target byte order, BUFLEN bytes long.
   The result is the size of the insn in bytes or zero for an unknown insn
   or -1 if an error occurs fetching data (memory_error_func will have
   been called).  */

static int
print_insn (CGEN_CPU_DESC cd,
	    bfd_vma pc,
	    disassemble_info *info,
	    char *buf,
	    unsigned int buflen)
{
  CGEN_INSN_INT insn_value;
  const CGEN_INSN_LIST *insn_list;
  CGEN_EXTRACT_INFO ex_info;
  int basesize;

  /* Extract base part of instruction, just in case CGEN_DIS_* uses it. */
  basesize = cd->base_insn_bitsize < buflen * 8 ?
                                     cd->base_insn_bitsize : buflen * 8;
  insn_value = cgen_get_insn_value (cd, buf, basesize);


  /* Fill in ex_info fields like read_insn would.  Don't actually call
     read_insn, since the incoming buffer is already read (and possibly
     modified a la m32r).  */
  ex_info.valid = (1 << buflen) - 1;
  ex_info.dis_info = info;
  ex_info.insn_bytes = buf;

  /* The instructions are stored in hash lists.
     Pick the first one and keep trying until we find the right one.  */

  insn_list = CGEN_DIS_LOOKUP_INSN (cd, buf, insn_value);
  while (insn_list != NULL)
    {
      const CGEN_INSN *insn = insn_list->insn;
      CGEN_FIELDS fields;
      int length;
      unsigned long insn_value_cropped;

#ifdef CGEN_VALIDATE_INSN_SUPPORTED 
      /* Not needed as insn shouldn't be in hash lists if not supported.  */
      /* Supported by this cpu?  */
      if (! frv_cgen_insn_supported (cd, insn))
        {
          insn_list = CGEN_DIS_NEXT_INSN (insn_list);
	  continue;
        }
#endif

      /* Basic bit mask must be correct.  */
      /* ??? May wish to allow target to defer this check until the extract
	 handler.  */

      /* Base size may exceed this instruction's size.  Extract the
         relevant part from the buffer. */
      if ((unsigned) (CGEN_INSN_BITSIZE (insn) / 8) < buflen &&
	  (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
	insn_value_cropped = bfd_get_bits (buf, CGEN_INSN_BITSIZE (insn), 
					   info->endian == BFD_ENDIAN_BIG);
      else
	insn_value_cropped = insn_value;

      if ((insn_value_cropped & CGEN_INSN_BASE_MASK (insn))
	  == CGEN_INSN_BASE_VALUE (insn))
	{
	  /* Printing is handled in two passes.  The first pass parses the
	     machine insn and extracts the fields.  The second pass prints
	     them.  */

	  /* Make sure the entire insn is loaded into insn_value, if it
	     can fit.  */
	  if (((unsigned) CGEN_INSN_BITSIZE (insn) > cd->base_insn_bitsize) &&
	      (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
	    {
	      unsigned long full_insn_value;
	      int rc = read_insn (cd, pc, info, buf,
				  CGEN_INSN_BITSIZE (insn) / 8,
				  & ex_info, & full_insn_value);
	      if (rc != 0)
		return rc;
	      length = CGEN_EXTRACT_FN (cd, insn)
		(cd, insn, &ex_info, full_insn_value, &fields, pc);
	    }
	  else
	    length = CGEN_EXTRACT_FN (cd, insn)
	      (cd, insn, &ex_info, insn_value_cropped, &fields, pc);

	  /* length < 0 -> error */
	  if (length < 0)
	    return length;
	  if (length > 0)
	    {
	      CGEN_PRINT_FN (cd, insn) (cd, info, insn, &fields, pc, length);
	      /* length is in bits, result is in bytes */
	      return length / 8;
	    }
	}

      insn_list = CGEN_DIS_NEXT_INSN (insn_list);
    }

  return 0;
}

/* Default value for CGEN_PRINT_INSN.
   The result is the size of the insn in bytes or zero for an unknown insn
   or -1 if an error occured fetching bytes.  */

#ifndef CGEN_PRINT_INSN
#define CGEN_PRINT_INSN default_print_insn
#endif

static int
default_print_insn (CGEN_CPU_DESC cd, bfd_vma pc, disassemble_info *info)
{
  char buf[CGEN_MAX_INSN_SIZE];
  int buflen;
  int status;

  /* Attempt to read the base part of the insn.  */
  buflen = cd->base_insn_bitsize / 8;
  status = (*info->read_memory_func) (pc, buf, buflen, info);

  /* Try again with the minimum part, if min < base.  */
  if (status != 0 && (cd->min_insn_bitsize < cd->base_insn_bitsize))
    {
      buflen = cd->min_insn_bitsize / 8;
      status = (*info->read_memory_func) (pc, buf, buflen, info);
    }

  if (status != 0)
    {
      (*info->memory_error_func) (status, pc, info);
      return -1;
    }

  return print_insn (cd, pc, info, buf, buflen);
}

/* Main entry point.
   Print one instruction from PC on INFO->STREAM.
   Return the size of the instruction (in bytes).  */

typedef struct cpu_desc_list {
  struct cpu_desc_list *next;
  int isa;
  int mach;
  int endian;
  CGEN_CPU_DESC cd;
} cpu_desc_list;

int
print_insn_frv (bfd_vma pc, disassemble_info *info)
{
  static cpu_desc_list *cd_list = 0;
  cpu_desc_list *cl = 0;
  static CGEN_CPU_DESC cd = 0;
  static int prev_isa;
  static int prev_mach;
  static int prev_endian;
  int length;
  int isa,mach;
  int endian = (info->endian == BFD_ENDIAN_BIG
		? CGEN_ENDIAN_BIG
		: CGEN_ENDIAN_LITTLE);
  enum bfd_architecture arch;

  /* ??? gdb will set mach but leave the architecture as "unknown" */
#ifndef CGEN_BFD_ARCH
#define CGEN_BFD_ARCH bfd_arch_frv
#endif
  arch = info->arch;
  if (arch == bfd_arch_unknown)
    arch = CGEN_BFD_ARCH;
   
  /* There's no standard way to compute the machine or isa number
     so we leave it to the target.  */
#ifdef CGEN_COMPUTE_MACH
  mach = CGEN_COMPUTE_MACH (info);
#else
  mach = info->mach;
#endif

#ifdef CGEN_COMPUTE_ISA
  isa = CGEN_COMPUTE_ISA (info);
#else
  isa = info->insn_sets;
#endif

  /* If we've switched cpu's, try to find a handle we've used before */
  if (cd
      && (isa != prev_isa
	  || mach != prev_mach
	  || endian != prev_endian))
    {
      cd = 0;
      for (cl = cd_list; cl; cl = cl->next)
	{
	  if (cl->isa == isa &&
	      cl->mach == mach &&
	      cl->endian == endian)
	    {
	      cd = cl->cd;
	      break;
	    }
	}
    } 

  /* If we haven't initialized yet, initialize the opcode table.  */
  if (! cd)
    {
      const bfd_arch_info_type *arch_type = bfd_lookup_arch (arch, mach);
      const char *mach_name;

      if (!arch_type)
	abort ();
      mach_name = arch_type->printable_name;

      prev_isa = isa;
      prev_mach = mach;
      prev_endian = endian;
      cd = frv_cgen_cpu_open (CGEN_CPU_OPEN_ISAS, prev_isa,
				 CGEN_CPU_OPEN_BFDMACH, mach_name,
				 CGEN_CPU_OPEN_ENDIAN, prev_endian,
				 CGEN_CPU_OPEN_END);
      if (!cd)
	abort ();

      /* save this away for future reference */
      cl = xmalloc (sizeof (struct cpu_desc_list));
      cl->cd = cd;
      cl->isa = isa;
      cl->mach = mach;
      cl->endian = endian;
      cl->next = cd_list;
      cd_list = cl;

      frv_cgen_init_dis (cd);
    }

  /* We try to have as much common code as possible.
     But at this point some targets need to take over.  */
  /* ??? Some targets may need a hook elsewhere.  Try to avoid this,
     but if not possible try to move this hook elsewhere rather than
     have two hooks.  */
  length = CGEN_PRINT_INSN (cd, pc, info);
  if (length > 0)
    return length;
  if (length < 0)
    return -1;

  (*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG);
  return cd->default_insn_bitsize / 8;
}