opcodes/cgen-asm.c

   1 /* CGEN generic assembler support code.
   2    Copyright (C) 1996-2020 Free Software Foundation, Inc.
   3
   4    This file is part of libopcodes.
   5
   6    This library is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3, or (at your option)
   9    any later version.
  10
  11    It is distributed in the hope that it will be useful, but WITHOUT
  12    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  14    License for more details.
  15
  16
  17    You should have received a copy of the GNU General Public License along
  18    with this program; if not, write to the Free Software Foundation, Inc.,
  19    51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  20
  21 #include "sysdep.h"
  22 #include <stdio.h>
  23 #include "ansidecl.h"
  24 #include "libiberty.h"
  25 #include "safe-ctype.h"
  26 #include "bfd.h"
  27 #include "symcat.h"
  28 #include "opcode/cgen.h"
  29 #include "opintl.h"
  30
  31 static CGEN_INSN_LIST *  hash_insn_array      (CGEN_CPU_DESC, const CGEN_INSN *, int, int, CGEN_INSN_LIST **, CGEN_INSN_LIST *);
  32 static CGEN_INSN_LIST *  hash_insn_list       (CGEN_CPU_DESC, const CGEN_INSN_LIST *, CGEN_INSN_LIST **, CGEN_INSN_LIST *);
  33 static void              build_asm_hash_table (CGEN_CPU_DESC);
  34
  35 /* Set the cgen_parse_operand_fn callback.  */
  36
  37 void
  38 cgen_set_parse_operand_fn (CGEN_CPU_DESC cd, cgen_parse_operand_fn fn)
  39 {
  40   cd->parse_operand_fn = fn;
  41 }
  42
  43 /* Called whenever starting to parse an insn.  */
  44
  45 void
  46 cgen_init_parse_operand (CGEN_CPU_DESC cd)
  47 {
  48   /* This tells the callback to re-initialize.  */
  49   (void) (* cd->parse_operand_fn)
  50     (cd, CGEN_PARSE_OPERAND_INIT, NULL, 0, 0, NULL, NULL);
  51 }
  52
  53 /* Subroutine of build_asm_hash_table to add INSNS to the hash table.
  54
  55    COUNT is the number of elements in INSNS.
  56    ENTSIZE is sizeof (CGEN_IBASE) for the target.
  57    ??? No longer used but leave in for now.
  58    HTABLE points to the hash table.
  59    HENTBUF is a pointer to sufficiently large buffer of hash entries.
  60    The result is a pointer to the next entry to use.
  61
  62    The table is scanned backwards as additions are made to the front of the
  63    list and we want earlier ones to be prefered.  */
  64
  65 static CGEN_INSN_LIST *
  66 hash_insn_array (CGEN_CPU_DESC cd,
  67                  const CGEN_INSN *insns,
  68                  int count,
  69                  int entsize ATTRIBUTE_UNUSED,
  70                  CGEN_INSN_LIST **htable,
  71                  CGEN_INSN_LIST *hentbuf)
  72 {
  73   int i;
  74
  75   for (i = count - 1; i >= 0; --i, ++hentbuf)
  76     {
  77       unsigned int hash;
  78       const CGEN_INSN *insn = &insns[i];
  79
  80       if (! (* cd->asm_hash_p) (insn))
  81         continue;
  82       hash = (* cd->asm_hash) (CGEN_INSN_MNEMONIC (insn));
  83       hentbuf->next = htable[hash];
  84       hentbuf->insn = insn;
  85       htable[hash] = hentbuf;
  86     }
  87
  88   return hentbuf;
  89 }
  90
  91 /* Subroutine of build_asm_hash_table to add INSNS to the hash table.
  92    This function is identical to hash_insn_array except the insns are
  93    in a list.  */
  94
  95 static CGEN_INSN_LIST *
  96 hash_insn_list (CGEN_CPU_DESC cd,
  97                 const CGEN_INSN_LIST *insns,
  98                 CGEN_INSN_LIST **htable,
  99                 CGEN_INSN_LIST *hentbuf)
 100 {
 101   const CGEN_INSN_LIST *ilist;
 102
 103   for (ilist = insns; ilist != NULL; ilist = ilist->next, ++ hentbuf)
 104     {
 105       unsigned int hash;
 106
 107       if (! (* cd->asm_hash_p) (ilist->insn))
 108         continue;
 109       hash = (* cd->asm_hash) (CGEN_INSN_MNEMONIC (ilist->insn));
 110       hentbuf->next = htable[hash];
 111       hentbuf->insn = ilist->insn;
 112       htable[hash] = hentbuf;
 113     }
 114
 115   return hentbuf;
 116 }
 117
 118 /* Build the assembler instruction hash table.  */
 119
 120 static void
 121 build_asm_hash_table (CGEN_CPU_DESC cd)
 122 {
 123   int count = cgen_insn_count (cd) + cgen_macro_insn_count (cd);
 124   CGEN_INSN_TABLE *insn_table = &cd->insn_table;
 125   CGEN_INSN_TABLE *macro_insn_table = &cd->macro_insn_table;
 126   unsigned int hash_size = cd->asm_hash_size;
 127   CGEN_INSN_LIST *hash_entry_buf;
 128   CGEN_INSN_LIST **asm_hash_table;
 129   CGEN_INSN_LIST *asm_hash_table_entries;
 130
 131   /* The space allocated for the hash table consists of two parts:
 132      the hash table and the hash lists.  */
 133
 134   asm_hash_table = (CGEN_INSN_LIST **)
 135     xmalloc (hash_size * sizeof (CGEN_INSN_LIST *));
 136   memset (asm_hash_table, 0, hash_size * sizeof (CGEN_INSN_LIST *));
 137   asm_hash_table_entries = hash_entry_buf = (CGEN_INSN_LIST *)
 138     xmalloc (count * sizeof (CGEN_INSN_LIST));
 139
 140   /* Add compiled in insns.
 141      Don't include the first one as it is a reserved entry.  */
 142   /* ??? It was the end of all hash chains, and also the special
 143      "invalid insn" marker.  May be able to do it differently now.  */
 144
 145   hash_entry_buf = hash_insn_array (cd,
 146                                     insn_table->init_entries + 1,
 147                                     insn_table->num_init_entries - 1,
 148                                     insn_table->entry_size,
 149                                     asm_hash_table, hash_entry_buf);
 150
 151   /* Add compiled in macro-insns.  */
 152
 153   hash_entry_buf = hash_insn_array (cd, macro_insn_table->init_entries,
 154                                     macro_insn_table->num_init_entries,
 155                                     macro_insn_table->entry_size,
 156                                     asm_hash_table, hash_entry_buf);
 157
 158   /* Add runtime added insns.
 159      Later added insns will be prefered over earlier ones.  */
 160
 161   hash_entry_buf = hash_insn_list (cd, insn_table->new_entries,
 162                                    asm_hash_table, hash_entry_buf);
 163
 164   /* Add runtime added macro-insns.  */
 165
 166   hash_insn_list (cd, macro_insn_table->new_entries,
 167                   asm_hash_table, hash_entry_buf);
 168
 169   cd->asm_hash_table = asm_hash_table;
 170   cd->asm_hash_table_entries = asm_hash_table_entries;
 171 }
 172
 173 /* Return the first entry in the hash list for INSN.  */
 174
 175 CGEN_INSN_LIST *
 176 cgen_asm_lookup_insn (CGEN_CPU_DESC cd, const char *insn)
 177 {
 178   unsigned int hash;
 179
 180   if (cd->asm_hash_table == NULL)
 181     build_asm_hash_table (cd);
 182
 183   hash = (* cd->asm_hash) (insn);
 184   return cd->asm_hash_table[hash];
 185 }
 186 \f
 187 /* Keyword parser.
 188    The result is NULL upon success or an error message.
 189    If successful, *STRP is updated to point passed the keyword.
 190
 191    ??? At present we have a static notion of how to pick out a keyword.
 192    Later we can allow a target to customize this if necessary [say by
 193    recording something in the keyword table].  */
 194
 195 const char *
 196 cgen_parse_keyword (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 197                     const char **strp,
 198                     CGEN_KEYWORD *keyword_table,
 199                     long *valuep)
 200 {
 201   const CGEN_KEYWORD_ENTRY *ke;
 202   char buf[256];
 203   const char *p,*start;
 204
 205   if (keyword_table->name_hash_table == NULL)
 206     (void) cgen_keyword_search_init (keyword_table, NULL);
 207
 208   p = start = *strp;
 209
 210   /* Allow any first character.  This is to make life easier for
 211      the fairly common case of suffixes, eg. 'ld.b.w', where the first
 212      character of the suffix ('.') is special.  */
 213   if (*p)
 214     ++p;
 215
 216   /* Allow letters, digits, and any special characters.  */
 217   while (((p - start) < (int) sizeof (buf))
 218          && *p
 219          && (ISALNUM (*p)
 220              || *p == '_'
 221              || strchr (keyword_table->nonalpha_chars, *p)))
 222     ++p;
 223
 224   if (p - start >= (int) sizeof (buf))
 225     {
 226       /* All non-empty CGEN keywords can fit into BUF.  The only thing
 227          we can match here is the empty keyword.  */
 228       buf[0] = 0;
 229     }
 230   else
 231     {
 232       memcpy (buf, start, p - start);
 233       buf[p - start] = 0;
 234     }
 235
 236   ke = cgen_keyword_lookup_name (keyword_table, buf);
 237
 238   if (ke != NULL)
 239     {
 240       *valuep = ke->value;
 241       /* Don't advance pointer if we recognized the null keyword.  */
 242       if (ke->name[0] != 0)
 243         *strp = p;
 244       return NULL;
 245     }
 246
 247   return "unrecognized keyword/register name";
 248 }
 249
 250 /* Parse a small signed integer parser.
 251    ??? VALUEP is not a bfd_vma * on purpose, though this is confusing.
 252    Note that if the caller expects a bfd_vma result, it should call
 253    cgen_parse_address.  */
 254
 255 const char *
 256 cgen_parse_signed_integer (CGEN_CPU_DESC cd,
 257                            const char **strp,
 258                            int opindex,
 259                            long *valuep)
 260 {
 261   bfd_vma value;
 262   enum cgen_parse_operand_result result;
 263   const char *errmsg;
 264
 265   errmsg = (* cd->parse_operand_fn)
 266     (cd, CGEN_PARSE_OPERAND_INTEGER, strp, opindex, BFD_RELOC_NONE,
 267      &result, &value);
 268   /* FIXME: Examine `result'.  */
 269   if (!errmsg)
 270     {
 271       /* Handle the case where a hex value is parsed on a 64-bit host.
 272          A value like 0xffffe000 is clearly intended to be a negative
 273          16-bit value, but on a 64-bit host it will be parsed by gas
 274          as 0x00000000ffffe000.
 275
 276          The shifts below are designed not to produce compile time
 277          warnings on a 32-bit host.  */
 278       if (sizeof (value) > 4
 279           && result == CGEN_PARSE_OPERAND_RESULT_NUMBER
 280           && value > 0
 281           && (value & 0x80000000)
 282           && ((value >> 31) == 1))
 283         value |= ((bfd_vma) -1) << 31;
 284
 285       *valuep = value;
 286     }
 287   return errmsg;
 288 }
 289
 290 /* Parse a small unsigned integer parser.
 291    ??? VALUEP is not a bfd_vma * on purpose, though this is confusing.
 292    Note that if the caller expects a bfd_vma result, it should call
 293    cgen_parse_address.  */
 294
 295 const char *
 296 cgen_parse_unsigned_integer (CGEN_CPU_DESC cd,
 297                              const char **strp,
 298                              int opindex,
 299                              unsigned long *valuep)
 300 {
 301   bfd_vma value;
 302   enum cgen_parse_operand_result result;
 303   const char *errmsg;
 304
 305   errmsg = (* cd->parse_operand_fn)
 306     (cd, CGEN_PARSE_OPERAND_INTEGER, strp, opindex, BFD_RELOC_NONE,
 307      &result, &value);
 308   /* FIXME: Examine `result'.  */
 309   if (!errmsg)
 310     *valuep = value;
 311   return errmsg;
 312 }
 313
 314 /* Address parser.  */
 315
 316 const char *
 317 cgen_parse_address (CGEN_CPU_DESC cd,
 318                     const char **strp,
 319                     int opindex,
 320                     int opinfo,
 321                     enum cgen_parse_operand_result *resultp,
 322                     bfd_vma *valuep)
 323 {
 324   bfd_vma value;
 325   enum cgen_parse_operand_result result_type;
 326   const char *errmsg;
 327
 328   errmsg = (* cd->parse_operand_fn)
 329     (cd, CGEN_PARSE_OPERAND_ADDRESS, strp, opindex, opinfo,
 330      &result_type, &value);
 331   /* FIXME: Examine `result'.  */
 332   if (!errmsg)
 333     {
 334       if (resultp != NULL)
 335         *resultp = result_type;
 336       *valuep = value;
 337     }
 338   return errmsg;
 339 }
 340 \f
 341 /* Signed integer validation routine.  */
 342
 343 const char *
 344 cgen_validate_signed_integer (long value, long min, long max)
 345 {
 346   if (value < min || value > max)
 347     {
 348       static char buf[100];
 349
 350       /* xgettext:c-format */
 351       sprintf (buf, _("operand out of range (%ld not between %ld and %ld)"),
 352                       value, min, max);
 353       return buf;
 354     }
 355
 356   return NULL;
 357 }
 358
 359 /* Unsigned integer validation routine.
 360    Supplying `min' here may seem unnecessary, but we also want to handle
 361    cases where min != 0 (and max > LONG_MAX).  */
 362
 363 const char *
 364 cgen_validate_unsigned_integer (unsigned long value,
 365                                 unsigned long min,
 366                                 unsigned long max)
 367 {
 368   if (value < min || value > max)
 369     {
 370       static char buf[100];
 371
 372       /* xgettext:c-format */
 373       sprintf (buf, _("operand out of range (%lu not between %lu and %lu)"),
 374                value, min, max);
 375       return buf;
 376     }
 377
 378   return NULL;
 379 }