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, 1999 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 /* Used by the ifield rtx function.  */
  34 #define FLD(f) (fields->f)
  35
  36 /* The hash functions are recorded here to help keep assembler code out of
  37    the disassembler and vice versa.  */
  38
  39 static int asm_hash_insn_p PARAMS ((const CGEN_INSN *));
  40 static unsigned int asm_hash_insn PARAMS ((const char *));
  41 static int dis_hash_insn_p PARAMS ((const CGEN_INSN *));
  42 static unsigned int dis_hash_insn PARAMS ((const char *, CGEN_INSN_INT));
  43
  44 /* Look up instruction INSN_VALUE and extract its fields.
  45    INSN, if non-null, is the insn table entry.
  46    Otherwise INSN_VALUE is examined to compute it.
  47    LENGTH is the bit length of INSN_VALUE if known, otherwise 0.
  48    0 is only valid if `insn == NULL && ! CGEN_INT_INSN_P'.
  49    If INSN != NULL, LENGTH must be valid.
  50    ALIAS_P is non-zero if alias insns are to be included in the search.
  51
  52    The result is a pointer to the insn table entry, or NULL if the instruction
  53    wasn't recognized.  */
  54
  55 const CGEN_INSN *
  56 @arch@_cgen_lookup_insn (od, insn, insn_value, length, fields, alias_p)
  57      CGEN_OPCODE_DESC od;
  58      const CGEN_INSN *insn;
  59      CGEN_INSN_BYTES insn_value;
  60      int length;
  61      CGEN_FIELDS *fields;
  62      int alias_p;
  63 {
  64   unsigned char buf[CGEN_MAX_INSN_SIZE];
  65   unsigned char *bufp;
  66   CGEN_INSN_INT base_insn;
  67 #if CGEN_INT_INSN_P
  68   CGEN_EXTRACT_INFO *info = NULL;
  69 #else
  70   CGEN_EXTRACT_INFO ex_info;
  71   CGEN_EXTRACT_INFO *info = &ex_info;
  72 #endif
  73
  74 #if CGEN_INT_INSN_P
  75   cgen_put_insn_value (od, buf, length, insn_value);
  76   bufp = buf;
  77   base_insn = insn_value; /*???*/
  78 #else
  79   ex_info.dis_info = NULL;
  80   ex_info.insn_bytes = insn_value;
  81   ex_info.valid = -1;
  82   base_insn = cgen_get_insn_value (od, buf, length);
  83   bufp = insn_value;
  84 #endif
  85
  86   if (!insn)
  87     {
  88       const CGEN_INSN_LIST *insn_list;
  89
  90       /* The instructions are stored in hash lists.
  91          Pick the first one and keep trying until we find the right one.  */
  92
  93       insn_list = CGEN_DIS_LOOKUP_INSN (od, bufp, base_insn);
  94       while (insn_list != NULL)
  95         {
  96           insn = insn_list->insn;
  97
  98           if (alias_p
  99               || ! CGEN_INSN_ATTR (insn, CGEN_INSN_ALIAS))
 100             {
 101               /* Basic bit mask must be correct.  */
 102               /* ??? May wish to allow target to defer this check until the
 103                  extract handler.  */
 104               if ((base_insn & CGEN_INSN_BASE_MASK (insn))
 105                   == CGEN_INSN_BASE_VALUE (insn))
 106                 {
 107                   /* ??? 0 is passed for `pc' */
 108                   int elength = (*CGEN_EXTRACT_FN (insn)) (od, insn, info,
 109                                                            base_insn, fields,
 110                                                            (bfd_vma) 0);
 111                   if (elength > 0)
 112                     {
 113                       /* sanity check */
 114                       if (length != 0 && length != elength)
 115                         abort ();
 116                       return insn;
 117                     }
 118                 }
 119             }
 120
 121           insn_list = CGEN_DIS_NEXT_INSN (insn_list);
 122         }
 123     }
 124   else
 125     {
 126       /* Sanity check: can't pass an alias insn if ! alias_p.  */
 127       if (! alias_p
 128           && CGEN_INSN_ATTR (insn, CGEN_INSN_ALIAS))
 129         abort ();
 130       /* Sanity check: length must be correct.  */
 131       if (length != CGEN_INSN_BITSIZE (insn))
 132         abort ();
 133
 134       /* ??? 0 is passed for `pc' */
 135       length = (*CGEN_EXTRACT_FN (insn)) (od, insn, info, base_insn, fields,
 136                                           (bfd_vma) 0);
 137       /* Sanity check: must succeed.
 138          Could relax this later if it ever proves useful.  */
 139       if (length == 0)
 140         abort ();
 141       return insn;
 142     }
 143
 144   return NULL;
 145 }
 146
 147 /* Fill in the operand instances used by INSN whose operands are FIELDS.
 148    INDICES is a pointer to a buffer of MAX_OPERAND_INSTANCES ints to be filled
 149    in.  */
 150
 151 void
 152 @arch@_cgen_get_insn_operands (od, insn, fields, indices)
 153      CGEN_OPCODE_DESC od;
 154      const CGEN_INSN * insn;
 155      const CGEN_FIELDS * fields;
 156      int *indices;
 157 {
 158   const CGEN_OPERAND_INSTANCE *opinst;
 159   int i;
 160
 161   for (i = 0, opinst = CGEN_INSN_OPERANDS (insn);
 162        opinst != NULL
 163          && CGEN_OPERAND_INSTANCE_TYPE (opinst) != CGEN_OPERAND_INSTANCE_END;
 164        ++i, ++opinst)
 165     {
 166       const CGEN_OPERAND *op = CGEN_OPERAND_INSTANCE_OPERAND (opinst);
 167       if (op == NULL)
 168         indices[i] = CGEN_OPERAND_INSTANCE_INDEX (opinst);
 169       else
 170         indices[i] = @arch@_cgen_get_int_operand (CGEN_OPERAND_INDEX (op),
 171                                                   fields);
 172     }
 173 }
 174
 175 /* Cover function to @arch@_cgen_get_insn_operands when either INSN or FIELDS
 176    isn't known.
 177    The INSN, INSN_VALUE, and LENGTH arguments are passed to
 178    @arch@_cgen_lookup_insn unchanged.
 179
 180    The result is the insn table entry or NULL if the instruction wasn't
 181    recognized.  */
 182
 183 const CGEN_INSN *
 184 @arch@_cgen_lookup_get_insn_operands (od, insn, insn_value, length, indices)
 185      CGEN_OPCODE_DESC od;
 186      const CGEN_INSN *insn;
 187      CGEN_INSN_BYTES insn_value;
 188      int length;
 189      int *indices;
 190 {
 191   CGEN_FIELDS fields;
 192
 193   /* Pass non-zero for ALIAS_P only if INSN != NULL.
 194      If INSN == NULL, we want a real insn.  */
 195   insn = @arch@_cgen_lookup_insn (od, insn, insn_value, length, &fields,
 196                                   insn != NULL);
 197   if (! insn)
 198     return NULL;
 199
 200   @arch@_cgen_get_insn_operands (od, insn, &fields, indices);
 201   return insn;
 202 }