/* 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.
   ALIAS_P is non-zero if alias insns are to be included in the search.
   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, alias_p)
     const CGEN_INSN *insn;
     cgen_insn_t insn_value;
     int length;
     CGEN_FIELDS *fields;
{
  char buf[16];

  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;

	  if (alias_p
	      || ! CGEN_INSN_ATTR (insn, CGEN_INSN_ALIAS))
	    {
	      /* 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
    {
      /* Sanity check: can't pass an alias insn if ! alias_p.  */
      if (! alias_p
	  && CGEN_INSN_ATTR (insn, CGEN_INSN_ALIAS))
	abort ();

      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_OPERAND_INSTANCES 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;

  /* FIXME: ALIAS insns are in transition from being record in the insn table
     to being recorded separately as macros.  They don't have semantic code
     so they can't be used here.  Thus we currently always ignore the INSN
     argument.  */
  insn = @arch@_cgen_lookup_insn (NULL, insn_value, length, &fields, 0);
  if (! insn)
    return NULL;

  for (i = 0, opinst = CGEN_INSN_OPERANDS (insn);
       opinst != NULL
	 && 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;
}