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 @arch@-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
  22 Foundation, Inc., 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 "@arch@-opc.h"
  31
  32 /* Look up instruction INSN_VALUE and extract its fields.
  33    INSN, if non-null, is the insn table entry.
  34    Otherwise INSN_VALUE is examined to compute it.
  35    LENGTH is the bit length of INSN_VALUE if known, otherwise 0.
  36    0 is only valid if `insn == NULL && ! defined (CGEN_INT_INSN)'.
  37    If INSN != NULL, LENGTH must be valid.
  38    ALIAS_P is non-zero if alias insns are to be included in the search.
  39
  40    The result a pointer to the insn table entry, or NULL if the instruction
  41    wasn't recognized.  */
  42
  43 const CGEN_INSN *
  44 @arch@_cgen_lookup_insn (insn, insn_value, length, fields, alias_p)
  45      const CGEN_INSN *insn;
  46      cgen_insn_t insn_value;
  47      int length;
  48      CGEN_FIELDS *fields;
  49      int alias_p;
  50 {
  51   char buf[16];
  52
  53   if (!insn)
  54     {
  55       const CGEN_INSN_LIST *insn_list;
  56
  57 #ifdef CGEN_INT_INSN
  58       switch (length)
  59         {
  60         case 8:
  61           buf[0] = insn_value;
  62           break;
  63         case 16:
  64           if (cgen_current_endian == CGEN_ENDIAN_BIG)
  65             bfd_putb16 (insn_value, buf);
  66           else
  67             bfd_putl16 (insn_value, buf);
  68           break;
  69         case 32:
  70           if (cgen_current_endian == CGEN_ENDIAN_BIG)
  71             bfd_putb32 (insn_value, buf);
  72           else
  73             bfd_putl32 (insn_value, buf);
  74           break;
  75         default:
  76           abort ();
  77         }
  78 #else
  79       abort (); /* FIXME: unfinished */
  80 #endif
  81
  82       /* The instructions are stored in hash lists.
  83          Pick the first one and keep trying until we find the right one.  */
  84
  85       insn_list = CGEN_DIS_LOOKUP_INSN (buf, insn_value);
  86       while (insn_list != NULL)
  87         {
  88           insn = insn_list->insn;
  89
  90           if (alias_p
  91               || ! CGEN_INSN_ATTR (insn, CGEN_INSN_ALIAS))
  92             {
  93               /* Basic bit mask must be correct.  */
  94               /* ??? May wish to allow target to defer this check until the
  95                  extract handler.  */
  96               if ((insn_value & CGEN_INSN_MASK (insn)) == CGEN_INSN_VALUE (insn))
  97                 {
  98                   int elength = (*CGEN_EXTRACT_FN (insn)) (insn, NULL,
  99                                                            insn_value, fields);
 100                   if (elength > 0)
 101                     {
 102                       /* sanity check */
 103                       if (length != 0 && length != elength)
 104                         abort ();
 105                       return insn;
 106                     }
 107                 }
 108             }
 109
 110           insn_list = CGEN_DIS_NEXT_INSN (insn_list);
 111         }
 112     }
 113   else
 114     {
 115       /* Sanity check: can't pass an alias insn if ! alias_p.  */
 116       if (! alias_p
 117           && CGEN_INSN_ATTR (insn, CGEN_INSN_ALIAS))
 118         abort ();
 119       /* Sanity check: length must be correct.  */
 120       if (length != CGEN_INSN_BITSIZE (insn))
 121         abort ();
 122
 123       length = (*CGEN_EXTRACT_FN (insn)) (insn, NULL, insn_value, fields);
 124       /* Sanity check: must succeed.
 125          Could relax this later if it ever proves useful.  */
 126       if (length == 0)
 127         abort ();
 128       return insn;
 129     }
 130
 131   return NULL;
 132 }
 133
 134 /* Fill in the operand instances used by INSN whose operands are FIELDS.
 135    INDICES is a pointer to a buffer of MAX_OPERAND_INSTANCES ints to be filled
 136    in.  */
 137
 138 void
 139 @arch@_cgen_get_insn_operands (insn, fields, indices)
 140      const CGEN_INSN * insn;
 141      const CGEN_FIELDS * fields;
 142      int *indices;
 143 {
 144   const CGEN_OPERAND_INSTANCE *opinst;
 145   int i;
 146
 147   for (i = 0, opinst = CGEN_INSN_OPERANDS (insn);
 148        opinst != NULL
 149          && CGEN_OPERAND_INSTANCE_TYPE (opinst) != CGEN_OPERAND_INSTANCE_END;
 150        ++i, ++opinst)
 151     {
 152       const CGEN_OPERAND *op = CGEN_OPERAND_INSTANCE_OPERAND (opinst);
 153       if (op == NULL)
 154         indices[i] = CGEN_OPERAND_INSTANCE_INDEX (opinst);
 155       else
 156         indices[i] = @arch@_cgen_get_operand (CGEN_OPERAND_INDEX (op), fields);
 157     }
 158 }
 159
 160 /* Cover function to @arch@_cgen_get_insn_operands when either INSN or FIELDS
 161    isn't known.
 162    The INSN, INSN_VALUE, and LENGTH arguments are passed to
 163    @arch@_cgen_lookup_insn unchanged.
 164
 165    The result is the insn table entry or NULL if the instruction wasn't
 166    recognized.  */
 167
 168 const CGEN_INSN *
 169 @arch@_cgen_lookup_get_insn_operands (insn, insn_value, length, indices)
 170      const CGEN_INSN *insn;
 171      cgen_insn_t insn_value;
 172      int length;
 173      int *indices;
 174 {
 175   CGEN_FIELDS fields;
 176
 177   /* Pass non-zero for ALIAS_P only if INSN != NULL.
 178      If INSN == NULL, we want a real insn.  */
 179   insn = @arch@_cgen_lookup_insn (insn, insn_value, length, &fields,
 180                                   insn != NULL);
 181   if (! insn)
 182     return NULL;
 183
 184   @arch@_cgen_get_insn_operands (insn, &fields, indices);
 185   return insn;
 186 }