binutils-gdb/opcodes/xc16x-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, 2003, 2005, 2007
   Free Software Foundation, Inc.

   This file is part of libopcodes.

   This library 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 3, or (at your option)
   any later version.

   It 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.,
   51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, 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 "xc16x-desc.h"
#include "xc16x-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) ATTRIBUTE_UNUSED;
static void print_keyword
  (CGEN_CPU_DESC, void *, CGEN_KEYWORD *, long, unsigned int) ATTRIBUTE_UNUSED;
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 *, bfd_byte *, unsigned);
static int default_print_insn
  (CGEN_CPU_DESC, bfd_vma, disassemble_info *) ATTRIBUTE_UNUSED;
static int read_insn
  (CGEN_CPU_DESC, bfd_vma, disassemble_info *, bfd_byte *, int, CGEN_EXTRACT_INFO *,
   unsigned long *);

/* -- disassembler routines inserted here.  */

/* -- dis.c */

#define CGEN_PRINT_NORMAL(cd, info, value, attrs, pc, length)	\
  do								\
    {								\
      if (CGEN_BOOL_ATTR ((attrs), CGEN_OPERAND_DOT_PREFIX))	\
        info->fprintf_func (info->stream, ".");			\
      if (CGEN_BOOL_ATTR ((attrs), CGEN_OPERAND_POF_PREFIX))	\
        info->fprintf_func (info->stream, "#pof:");		\
      if (CGEN_BOOL_ATTR ((attrs), CGEN_OPERAND_PAG_PREFIX))	\
        info->fprintf_func (info->stream, "#pag:");		\
    }								\
  while (0)

/* Print a 'pof:' prefix to an operand.  */

static void
print_pof (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
	   void * dis_info ATTRIBUTE_UNUSED,
	   long value ATTRIBUTE_UNUSED,
	   unsigned int attrs ATTRIBUTE_UNUSED,
	   bfd_vma pc ATTRIBUTE_UNUSED,
	   int length ATTRIBUTE_UNUSED)
{
}

/* Print a 'pag:' prefix to an operand.  */

static void
print_pag (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
	   void * dis_info ATTRIBUTE_UNUSED,
	   long value ATTRIBUTE_UNUSED,
	   unsigned int attrs ATTRIBUTE_UNUSED,
	   bfd_vma pc ATTRIBUTE_UNUSED,
	   int length ATTRIBUTE_UNUSED)
{
}

/* Print a 'sof:' prefix to an operand.  */

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

  info->fprintf_func (info->stream, "sof:");
}

/* Print a 'seg:' prefix to an operand.  */

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

  info->fprintf_func (info->stream, "seg:");
}

/* Print a '#' prefix to an operand.  */

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

  info->fprintf_func (info->stream, "#");
}

/* Print a '.' prefix to an operand.  */

static void
print_dot (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
	   void * dis_info ATTRIBUTE_UNUSED,
	   long value ATTRIBUTE_UNUSED,
	   unsigned int attrs ATTRIBUTE_UNUSED,
	   bfd_vma pc ATTRIBUTE_UNUSED,
	   int length ATTRIBUTE_UNUSED)
{
}

/* -- */

void xc16x_cgen_print_operand
  (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
xc16x_cgen_print_operand (CGEN_CPU_DESC cd,
			   int opindex,
			   void * xinfo,
			   CGEN_FIELDS *fields,
			   void const *attrs ATTRIBUTE_UNUSED,
			   bfd_vma pc,
			   int length)
{
  disassemble_info *info = (disassemble_info *) xinfo;

  switch (opindex)
    {
    case XC16X_OPERAND_REGNAM :
      print_keyword (cd, info, & xc16x_cgen_opval_psw_names, fields->f_reg8, 0);
      break;
    case XC16X_OPERAND_BIT01 :
      print_normal (cd, info, fields->f_op_1bit, 0, pc, length);
      break;
    case XC16X_OPERAND_BIT1 :
      print_normal (cd, info, fields->f_op_bit1, 0, pc, length);
      break;
    case XC16X_OPERAND_BIT2 :
      print_normal (cd, info, fields->f_op_bit2, 0, pc, length);
      break;
    case XC16X_OPERAND_BIT4 :
      print_normal (cd, info, fields->f_op_bit4, 0, pc, length);
      break;
    case XC16X_OPERAND_BIT8 :
      print_normal (cd, info, fields->f_op_bit8, 0, pc, length);
      break;
    case XC16X_OPERAND_BITONE :
      print_normal (cd, info, fields->f_op_onebit, 0, pc, length);
      break;
    case XC16X_OPERAND_CADDR :
      print_address (cd, info, fields->f_offset16, 0|(1<<CGEN_OPERAND_RELOC)|(1<<CGEN_OPERAND_ABS_ADDR), pc, length);
      break;
    case XC16X_OPERAND_COND :
      print_keyword (cd, info, & xc16x_cgen_opval_conditioncode_names, fields->f_condcode, 0);
      break;
    case XC16X_OPERAND_DATA8 :
      print_normal (cd, info, fields->f_data8, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
      break;
    case XC16X_OPERAND_DATAHI8 :
      print_normal (cd, info, fields->f_datahi8, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
      break;
    case XC16X_OPERAND_DOT :
      print_dot (cd, info, 0, 0|(1<<CGEN_OPERAND_SIGNED), pc, length);
      break;
    case XC16X_OPERAND_DR :
      print_keyword (cd, info, & xc16x_cgen_opval_gr_names, fields->f_r1, 0);
      break;
    case XC16X_OPERAND_DRB :
      print_keyword (cd, info, & xc16x_cgen_opval_grb_names, fields->f_r1, 0);
      break;
    case XC16X_OPERAND_DRI :
      print_keyword (cd, info, & xc16x_cgen_opval_gr_names, fields->f_r4, 0);
      break;
    case XC16X_OPERAND_EXTCOND :
      print_keyword (cd, info, & xc16x_cgen_opval_extconditioncode_names, fields->f_extccode, 0);
      break;
    case XC16X_OPERAND_GENREG :
      print_keyword (cd, info, & xc16x_cgen_opval_r8_names, fields->f_regb8, 0);
      break;
    case XC16X_OPERAND_HASH :
      print_hash (cd, info, 0, 0|(1<<CGEN_OPERAND_SIGNED), pc, length);
      break;
    case XC16X_OPERAND_ICOND :
      print_keyword (cd, info, & xc16x_cgen_opval_conditioncode_names, fields->f_icondcode, 0);
      break;
    case XC16X_OPERAND_LBIT2 :
      print_normal (cd, info, fields->f_op_lbit2, 0, pc, length);
      break;
    case XC16X_OPERAND_LBIT4 :
      print_normal (cd, info, fields->f_op_lbit4, 0, pc, length);
      break;
    case XC16X_OPERAND_MASK8 :
      print_normal (cd, info, fields->f_mask8, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
      break;
    case XC16X_OPERAND_MASKLO8 :
      print_normal (cd, info, fields->f_datahi8, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
      break;
    case XC16X_OPERAND_MEMGR8 :
      print_keyword (cd, info, & xc16x_cgen_opval_memgr8_names, fields->f_memgr8, 0);
      break;
    case XC16X_OPERAND_MEMORY :
      print_address (cd, info, fields->f_memory, 0, pc, length);
      break;
    case XC16X_OPERAND_PAG :
      print_pag (cd, info, 0, 0|(1<<CGEN_OPERAND_SIGNED), pc, length);
      break;
    case XC16X_OPERAND_PAGENUM :
      print_normal (cd, info, fields->f_pagenum, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
      break;
    case XC16X_OPERAND_POF :
      print_pof (cd, info, 0, 0|(1<<CGEN_OPERAND_SIGNED), pc, length);
      break;
    case XC16X_OPERAND_QBIT :
      print_normal (cd, info, fields->f_qbit, 0|(1<<CGEN_OPERAND_DOT_PREFIX), pc, length);
      break;
    case XC16X_OPERAND_QHIBIT :
      print_normal (cd, info, fields->f_qhibit, 0|(1<<CGEN_OPERAND_DOT_PREFIX), pc, length);
      break;
    case XC16X_OPERAND_QLOBIT :
      print_normal (cd, info, fields->f_qlobit, 0|(1<<CGEN_OPERAND_DOT_PREFIX), pc, length);
      break;
    case XC16X_OPERAND_REG8 :
      print_keyword (cd, info, & xc16x_cgen_opval_r8_names, fields->f_reg8, 0);
      break;
    case XC16X_OPERAND_REGB8 :
      print_keyword (cd, info, & xc16x_cgen_opval_grb8_names, fields->f_regb8, 0);
      break;
    case XC16X_OPERAND_REGBMEM8 :
      print_keyword (cd, info, & xc16x_cgen_opval_regbmem8_names, fields->f_regmem8, 0);
      break;
    case XC16X_OPERAND_REGHI8 :
      print_keyword (cd, info, & xc16x_cgen_opval_r8_names, fields->f_reghi8, 0);
      break;
    case XC16X_OPERAND_REGMEM8 :
      print_keyword (cd, info, & xc16x_cgen_opval_regmem8_names, fields->f_regmem8, 0);
      break;
    case XC16X_OPERAND_REGOFF8 :
      print_keyword (cd, info, & xc16x_cgen_opval_r8_names, fields->f_regoff8, 0);
      break;
    case XC16X_OPERAND_REL :
      print_normal (cd, info, fields->f_rel8, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_RELOC)|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
      break;
    case XC16X_OPERAND_RELHI :
      print_normal (cd, info, fields->f_relhi8, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_RELOC)|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
      break;
    case XC16X_OPERAND_SEG :
      print_normal (cd, info, fields->f_seg8, 0, pc, length);
      break;
    case XC16X_OPERAND_SEGHI8 :
      print_normal (cd, info, fields->f_segnum8, 0, pc, length);
      break;
    case XC16X_OPERAND_SEGM :
      print_seg (cd, info, 0, 0|(1<<CGEN_OPERAND_SIGNED), pc, length);
      break;
    case XC16X_OPERAND_SOF :
      print_sof (cd, info, 0, 0|(1<<CGEN_OPERAND_SIGNED), pc, length);
      break;
    case XC16X_OPERAND_SR :
      print_keyword (cd, info, & xc16x_cgen_opval_gr_names, fields->f_r2, 0);
      break;
    case XC16X_OPERAND_SR2 :
      print_keyword (cd, info, & xc16x_cgen_opval_gr_names, fields->f_r0, 0);
      break;
    case XC16X_OPERAND_SRB :
      print_keyword (cd, info, & xc16x_cgen_opval_grb_names, fields->f_r2, 0);
      break;
    case XC16X_OPERAND_SRC1 :
      print_keyword (cd, info, & xc16x_cgen_opval_gr_names, fields->f_r1, 0);
      break;
    case XC16X_OPERAND_SRC2 :
      print_keyword (cd, info, & xc16x_cgen_opval_gr_names, fields->f_r2, 0);
      break;
    case XC16X_OPERAND_SRDIV :
      print_keyword (cd, info, & xc16x_cgen_opval_regdiv8_names, fields->f_reg8, 0);
      break;
    case XC16X_OPERAND_U4 :
      print_keyword (cd, info, & xc16x_cgen_opval_reg0_name, fields->f_uimm4, 0);
      break;
    case XC16X_OPERAND_UIMM16 :
      print_normal (cd, info, fields->f_uimm16, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
      break;
    case XC16X_OPERAND_UIMM2 :
      print_keyword (cd, info, & xc16x_cgen_opval_ext_names, fields->f_uimm2, 0|(1<<CGEN_OPERAND_HASH_PREFIX));
      break;
    case XC16X_OPERAND_UIMM3 :
      print_keyword (cd, info, & xc16x_cgen_opval_reg0_name1, fields->f_uimm3, 0|(1<<CGEN_OPERAND_HASH_PREFIX));
      break;
    case XC16X_OPERAND_UIMM4 :
      print_normal (cd, info, fields->f_uimm4, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
      break;
    case XC16X_OPERAND_UIMM7 :
      print_normal (cd, info, fields->f_uimm7, 0|(1<<CGEN_OPERAND_HASH_PREFIX)|(1<<CGEN_OPERAND_RELOC)|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
      break;
    case XC16X_OPERAND_UIMM8 :
      print_normal (cd, info, fields->f_uimm8, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
      break;
    case XC16X_OPERAND_UPAG16 :
      print_normal (cd, info, fields->f_uimm16, 0|(1<<CGEN_OPERAND_PAG_PREFIX), pc, length);
      break;
    case XC16X_OPERAND_UPOF16 :
      print_address (cd, info, fields->f_memory, 0|(1<<CGEN_OPERAND_POF_PREFIX), pc, length);
      break;
    case XC16X_OPERAND_USEG16 :
      print_normal (cd, info, fields->f_offset16, 0|(1<<CGEN_OPERAND_SEG_PREFIX)|(1<<CGEN_OPERAND_RELOC)|(1<<CGEN_OPERAND_ABS_ADDR), pc, length);
      break;
    case XC16X_OPERAND_USEG8 :
      print_normal (cd, info, fields->f_seg8, 0|(1<<CGEN_OPERAND_SEG_PREFIX), pc, length);
      break;
    case XC16X_OPERAND_USOF16 :
      print_normal (cd, info, fields->f_offset16, 0|(1<<CGEN_OPERAND_SOF_PREFIX)|(1<<CGEN_OPERAND_RELOC)|(1<<CGEN_OPERAND_ABS_ADDR), pc, length);
      break;

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

cgen_print_fn * const xc16x_cgen_print_handlers[] = 
{
  print_insn_normal,
};


void
xc16x_cgen_init_dis (CGEN_CPU_DESC cd)
{
  xc16x_cgen_init_opcode_table (cd);
  xc16x_cgen_init_ibld_table (cd);
  cd->print_handlers = & xc16x_cgen_print_handlers[0];
  cd->print_operand = xc16x_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.  */
      xc16x_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,
	   bfd_byte *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,
	    bfd_byte *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, (char *) 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 (! xc16x_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)
{
  bfd_byte 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;
  CGEN_BITSET *isa;
  int mach;
  int endian;
  CGEN_CPU_DESC cd;
} cpu_desc_list;

int
print_insn_xc16x (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 CGEN_BITSET *prev_isa;
  static int prev_mach;
  static int prev_endian;
  int length;
  CGEN_BITSET *isa;
  int 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_xc16x
#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
  {
    static CGEN_BITSET *permanent_isa;

    if (!permanent_isa)
      permanent_isa = cgen_bitset_create (MAX_ISAS);
    isa = permanent_isa;
    cgen_bitset_clear (isa);
    cgen_bitset_add (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
      && (cgen_bitset_compare (isa, prev_isa) != 0
	  || mach != prev_mach
	  || endian != prev_endian))
    {
      cd = 0;
      for (cl = cd_list; cl; cl = cl->next)
	{
	  if (cgen_bitset_compare (cl->isa, isa) == 0 &&
	      cl->mach == mach &&
	      cl->endian == endian)
	    {
	      cd = cl->cd;
 	      prev_isa = cd->isas;
	      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 = cgen_bitset_copy (isa);
      prev_mach = mach;
      prev_endian = endian;
      cd = xc16x_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 = prev_isa;
      cl->mach = mach;
      cl->endian = endian;
      cl->next = cd_list;
      cd_list = cl;

      xc16x_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;
}