opcodes/cgen-opc.in

   1 /* Generic opcode table support for targets using CGEN. -*- C -*-
   2    CGEN: Cpu tools GENerator
   3
   4 THIS FILE IS USED TO GENERATE @prefix@-opc.c.
   5
   6 Copyright (C) 1998 Free Software Foundation, Inc.
   7
   8 This file is part of the GNU Binutils and GDB, the GNU debugger.
   9
  10 This program is free software; you can redistribute it and/or modify
  11 it under the terms of the GNU General Public License as published by
  12 the Free Software Foundation; either version 2, or (at your option)
  13 any later version.
  14
  15 This program is distributed in the hope that it will be useful,
  16 but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 GNU General Public License for more details.
  19
  20 You should have received a copy of the GNU General Public License
  21 along with this program; if not, write to the Free Software Foundation, Inc.,
  22 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  23
  24 #include "sysdep.h"
  25 #include <stdio.h>
  26 #include "ansidecl.h"
  27 #include "libiberty.h"
  28 #include "bfd.h"
  29 #include "symcat.h"
  30 #include "@prefix@-opc.h"
  31 #include "opintl.h"
  32
  33 /* Look up instruction INSN_VALUE and extract its fields.
  34    INSN, if non-null, is the insn table entry.
  35    Otherwise INSN_VALUE is examined to compute it.
  36    LENGTH is the bit length of INSN_VALUE if known, otherwise 0.
  37    0 is only valid if `insn == NULL && ! defined (CGEN_INT_INSN)'.
  38    If INSN != NULL, LENGTH must be valid.
  39    ALIAS_P is non-zero if alias insns are to be included in the search.
  40
  41    The result a pointer to the insn table entry, or NULL if the instruction
  42    wasn't recognized.  */
  43
  44 const CGEN_INSN *
  45 @arch@_cgen_lookup_insn (insn, insn_value, length, fields, alias_p)
  46      const CGEN_INSN *insn;
  47      cgen_insn_t insn_value;
  48      int length;
  49      CGEN_FIELDS *fields;
  50      int alias_p;
  51 {
  52   char buf[16];
  53
  54   if (!insn)
  55     {
  56       const CGEN_INSN_LIST *insn_list;
  57
  58 #ifdef CGEN_INT_INSN
  59       switch (length)
  60         {
  61         case 8:
  62           buf[0] = insn_value;
  63           break;
  64         case 16:
  65           if (cgen_current_endian == CGEN_ENDIAN_BIG)
  66             bfd_putb16 (insn_value, buf);
  67           else
  68             bfd_putl16 (insn_value, buf);
  69           break;
  70         case 32:
  71           if (cgen_current_endian == CGEN_ENDIAN_BIG)
  72             bfd_putb32 (insn_value, buf);
  73           else
  74             bfd_putl32 (insn_value, buf);
  75           break;
  76         default:
  77           abort ();
  78         }
  79 #else
  80       abort (); /* FIXME: unfinished */
  81 #endif
  82
  83       /* The instructions are stored in hash lists.
  84          Pick the first one and keep trying until we find the right one.  */
  85
  86       insn_list = CGEN_DIS_LOOKUP_INSN (buf, insn_value);
  87       while (insn_list != NULL)
  88         {
  89           insn = insn_list->insn;
  90
  91           if (alias_p
  92               || ! CGEN_INSN_ATTR (insn, CGEN_INSN_ALIAS))
  93             {
  94               /* Basic bit mask must be correct.  */
  95               /* ??? May wish to allow target to defer this check until the
  96                  extract handler.  */
  97               if ((insn_value & CGEN_INSN_MASK (insn)) == CGEN_INSN_VALUE (insn))
  98                 {
  99                   /* ??? 0 is passed for `pc' */
 100                   int elength = (*CGEN_EXTRACT_FN (insn)) (insn, NULL,
 101                                                            insn_value, fields,
 102                                                            (bfd_vma) 0);
 103                   if (elength > 0)
 104                     {
 105                       /* sanity check */
 106                       if (length != 0 && length != elength)
 107                         abort ();
 108                       return insn;
 109                     }
 110                 }
 111             }
 112
 113           insn_list = CGEN_DIS_NEXT_INSN (insn_list);
 114         }
 115     }
 116   else
 117     {
 118       /* Sanity check: can't pass an alias insn if ! alias_p.  */
 119       if (! alias_p
 120           && CGEN_INSN_ATTR (insn, CGEN_INSN_ALIAS))
 121         abort ();
 122       /* Sanity check: length must be correct.  */
 123       if (length != CGEN_INSN_BITSIZE (insn))
 124         abort ();
 125
 126       /* ??? 0 is passed for `pc' */
 127       length = (*CGEN_EXTRACT_FN (insn)) (insn, NULL, insn_value, fields,
 128                                           (bfd_vma) 0);
 129       /* Sanity check: must succeed.
 130          Could relax this later if it ever proves useful.  */
 131       if (length == 0)
 132         abort ();
 133       return insn;
 134     }
 135
 136   return NULL;
 137 }
 138
 139 /* Fill in the operand instances used by INSN whose operands are FIELDS.
 140    INDICES is a pointer to a buffer of MAX_OPERAND_INSTANCES ints to be filled
 141    in.  */
 142
 143 void
 144 @arch@_cgen_get_insn_operands (insn, fields, indices)
 145      const CGEN_INSN * insn;
 146      const CGEN_FIELDS * fields;
 147      int *indices;
 148 {
 149   const CGEN_OPERAND_INSTANCE *opinst;
 150   int i;
 151
 152   for (i = 0, opinst = CGEN_INSN_OPERANDS (insn);
 153        opinst != NULL
 154          && CGEN_OPERAND_INSTANCE_TYPE (opinst) != CGEN_OPERAND_INSTANCE_END;
 155        ++i, ++opinst)
 156     {
 157       const CGEN_OPERAND *op = CGEN_OPERAND_INSTANCE_OPERAND (opinst);
 158       if (op == NULL)
 159         indices[i] = CGEN_OPERAND_INSTANCE_INDEX (opinst);
 160       else
 161         indices[i] = @arch@_cgen_get_int_operand (CGEN_OPERAND_INDEX (op),
 162                                                   fields);
 163     }
 164 }
 165
 166 /* Cover function to @arch@_cgen_get_insn_operands when either INSN or FIELDS
 167    isn't known.
 168    The INSN, INSN_VALUE, and LENGTH arguments are passed to
 169    @arch@_cgen_lookup_insn unchanged.
 170
 171    The result is the insn table entry or NULL if the instruction wasn't
 172    recognized.  */
 173
 174 const CGEN_INSN *
 175 @arch@_cgen_lookup_get_insn_operands (insn, insn_value, length, indices)
 176      const CGEN_INSN *insn;
 177      cgen_insn_t insn_value;
 178      int length;
 179      int *indices;
 180 {
 181   CGEN_FIELDS fields;
 182
 183   /* Pass non-zero for ALIAS_P only if INSN != NULL.
 184      If INSN == NULL, we want a real insn.  */
 185   insn = @arch@_cgen_lookup_insn (insn, insn_value, length, &fields,
 186                                   insn != NULL);
 187   if (! insn)
 188     return NULL;
 189
 190   @arch@_cgen_get_insn_operands (insn, &fields, indices);
 191   return insn;
 192 }