/* Generic opcode table support for targets using CGEN. -*- C -*-
   CGEN: Cpu tools GENerator

This file is used to generate @arch@-opc.c.

Copyright (C) 1998 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.  */

#include "sysdep.h"
#include <stdio.h>
#include "ansidecl.h"
#include "libiberty.h"
#include "bfd.h"
#include "symcat.h"
#include "@arch@-opc.h"

/* Look up instruction INSN_VALUE and extract its fields.
   If non-null INSN is the insn table entry.
   Otherwise INSN_VALUE is examined to compute it.
   LENGTH is the bit length of INSN_VALUE if known, otherwise 0.
   The result a pointer to the insn table entry, or NULL if the instruction
   wasn't recognized.  */

const CGEN_INSN *
@arch@_cgen_lookup_insn (insn, insn_value, length, fields)
     const CGEN_INSN *insn;
     cgen_insn_t insn_value;
     int length;
     CGEN_FIELDS *fields;
{
  char buf[4];

  if (!insn)
    {
      const CGEN_INSN_LIST *insn_list;

#ifdef CGEN_INT_INSN
      switch (length)
	{
	case 8:
	  buf[0] = insn_value;
	  break;
	case 16:
	  if (cgen_current_endian == CGEN_ENDIAN_BIG)
	    bfd_putb16 (insn_value, buf);
	  else
	    bfd_putl16 (insn_value, buf);
	  break;
	case 32:
	  if (cgen_current_endian == CGEN_ENDIAN_BIG)
	    bfd_putb32 (insn_value, buf);
	  else
	    bfd_putl32 (insn_value, buf);
	  break;
	default:
	  abort ();
	}
#else
      abort (); /* FIXME: unfinished */
#endif

      /* 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 (buf, insn_value);
      while (insn_list != NULL)
	{
	  insn = insn_list->insn;

	  /* Basic bit mask must be correct.  */
	  /* ??? May wish to allow target to defer this check until the extract
	     handler.  */
	  if ((insn_value & CGEN_INSN_MASK (insn)) == CGEN_INSN_VALUE (insn))
	    {
	      length = (*CGEN_EXTRACT_FN (insn)) (insn, NULL, insn_value, fields);
	      if (length > 0)
		return insn;
	    }

	  insn_list = CGEN_DIS_NEXT_INSN (insn_list);
	}
    }
  else
    {
      length = (*CGEN_EXTRACT_FN (insn)) (insn, NULL, insn_value, fields);
      if (length > 0)
	return insn;
    }

  return NULL;
}

/* Fill in the operand instances used by insn INSN_VALUE.
   If non-null INS is the insn table entry.
   Otherwise INSN_VALUE is examined to compute it.
   LENGTH is the number of bits in INSN_VALUE if known, otherwise 0.
   INDICES is a pointer to a buffer of MAX_OPERANDS ints to be filled in.
   The result a pointer to the insn table entry, or NULL if the instruction
   wasn't recognized.  */

const CGEN_INSN *
@arch@_cgen_get_insn_operands (insn, insn_value, length, indices)
     const CGEN_INSN *insn;
     cgen_insn_t insn_value;
     int length;
     int *indices;
{
  CGEN_FIELDS fields;
  const CGEN_OPERAND_INSTANCE *opinst;
  int i;

  insn = @arch@_cgen_lookup_insn (insn, insn_value, length, &fields);
  if (! insn)
    return NULL;

  for (i = 0, opinst = CGEN_INSN_OPERANDS (insn);
       CGEN_OPERAND_INSTANCE_TYPE (opinst) != CGEN_OPERAND_INSTANCE_END;
       ++i, ++opinst)
    {
      const CGEN_OPERAND *op = CGEN_OPERAND_INSTANCE_OPERAND (opinst);
      if (op == NULL)
	indices[i] = CGEN_OPERAND_INSTANCE_INDEX (opinst);
      else
	indices[i] = @arch@_cgen_get_operand (CGEN_OPERAND_INDEX (op), &fields);
    }

  return insn;
}