opcodes/cgen-asm.c

   1 /* CGEN generic assembler support code.
   2    Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2005, 2007,
   3    2011  Free Software Foundation, Inc.
   4
   5    This file is part of libopcodes.
   6
   7    This library is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3, or (at your option)
  10    any later version.
  11
  12    It is distributed in the hope that it will be useful, but WITHOUT
  13    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  15    License for more details.
  16
  17
  18    You should have received a copy of the GNU General Public License along
  19    with this program; if not, write to the Free Software Foundation, Inc.,
  20    51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  21
  22 #include "sysdep.h"
  23 #include <stdio.h>
  24 #include "ansidecl.h"
  25 #include "libiberty.h"
  26 #include "safe-ctype.h"
  27 #include "bfd.h"
  28 #include "symcat.h"
  29 #include "opcode/cgen.h"
  30 #include "opintl.h"
  31
  32 static CGEN_INSN_LIST *  hash_insn_array      (CGEN_CPU_DESC, const CGEN_INSN *, int, int, CGEN_INSN_LIST **, CGEN_INSN_LIST *);
  33 static CGEN_INSN_LIST *  hash_insn_list       (CGEN_CPU_DESC, const CGEN_INSN_LIST *, CGEN_INSN_LIST **, CGEN_INSN_LIST *);
  34 static void              build_asm_hash_table (CGEN_CPU_DESC);
  35
  36 /* Set the cgen_parse_operand_fn callback.  */
  37
  38 void
  39 cgen_set_parse_operand_fn (CGEN_CPU_DESC cd, cgen_parse_operand_fn fn)
  40 {
  41   cd->parse_operand_fn = fn;
  42 }
  43
  44 /* Called whenever starting to parse an insn.  */
  45
  46 void
  47 cgen_init_parse_operand (CGEN_CPU_DESC cd)
  48 {
  49   /* This tells the callback to re-initialize.  */
  50   (void) (* cd->parse_operand_fn)
  51     (cd, CGEN_PARSE_OPERAND_INIT, NULL, 0, 0, NULL, NULL);
  52 }
  53
  54 /* Subroutine of build_asm_hash_table to add INSNS to the hash table.
  55
  56    COUNT is the number of elements in INSNS.
  57    ENTSIZE is sizeof (CGEN_IBASE) for the target.
  58    ??? No longer used but leave in for now.
  59    HTABLE points to the hash table.
  60    HENTBUF is a pointer to sufficiently large buffer of hash entries.
  61    The result is a pointer to the next entry to use.
  62
  63    The table is scanned backwards as additions are made to the front of the
  64    list and we want earlier ones to be prefered.  */
  65
  66 static CGEN_INSN_LIST *
  67 hash_insn_array (CGEN_CPU_DESC cd,
  68                  const CGEN_INSN *insns,
  69                  int count,
  70                  int entsize ATTRIBUTE_UNUSED,
  71                  CGEN_INSN_LIST **htable,
  72                  CGEN_INSN_LIST *hentbuf)
  73 {
  74   int i;
  75
  76   for (i = count - 1; i >= 0; --i, ++hentbuf)
  77     {
  78       unsigned int hash;
  79       const CGEN_INSN *insn = &insns[i];
  80
  81       if (! (* cd->asm_hash_p) (insn))
  82         continue;
  83       hash = (* cd->asm_hash) (CGEN_INSN_MNEMONIC (insn));
  84       hentbuf->next = htable[hash];
  85       hentbuf->insn = insn;
  86       htable[hash] = hentbuf;
  87     }
  88
  89   return hentbuf;
  90 }
  91
  92 /* Subroutine of build_asm_hash_table to add INSNS to the hash table.
  93    This function is identical to hash_insn_array except the insns are
  94    in a list.  */
  95
  96 static CGEN_INSN_LIST *
  97 hash_insn_list (CGEN_CPU_DESC cd,
  98                 const CGEN_INSN_LIST *insns,
  99                 CGEN_INSN_LIST **htable,
 100                 CGEN_INSN_LIST *hentbuf)
 101 {
 102   const CGEN_INSN_LIST *ilist;
 103
 104   for (ilist = insns; ilist != NULL; ilist = ilist->next, ++ hentbuf)
 105     {
 106       unsigned int hash;
 107
 108       if (! (* cd->asm_hash_p) (ilist->insn))
 109         continue;
 110       hash = (* cd->asm_hash) (CGEN_INSN_MNEMONIC (ilist->insn));
 111       hentbuf->next = htable[hash];
 112       hentbuf->insn = ilist->insn;
 113       htable[hash] = hentbuf;
 114     }
 115
 116   return hentbuf;
 117 }
 118
 119 /* Build the assembler instruction hash table.  */
 120
 121 static void
 122 build_asm_hash_table (CGEN_CPU_DESC cd)
 123 {
 124   int count = cgen_insn_count (cd) + cgen_macro_insn_count (cd);
 125   CGEN_INSN_TABLE *insn_table = &cd->insn_table;
 126   CGEN_INSN_TABLE *macro_insn_table = &cd->macro_insn_table;
 127   unsigned int hash_size = cd->asm_hash_size;
 128   CGEN_INSN_LIST *hash_entry_buf;
 129   CGEN_INSN_LIST **asm_hash_table;
 130   CGEN_INSN_LIST *asm_hash_table_entries;
 131
 132   /* The space allocated for the hash table consists of two parts:
 133      the hash table and the hash lists.  */
 134
 135   asm_hash_table = (CGEN_INSN_LIST **)
 136     xmalloc (hash_size * sizeof (CGEN_INSN_LIST *));
 137   memset (asm_hash_table, 0, hash_size * sizeof (CGEN_INSN_LIST *));
 138   asm_hash_table_entries = hash_entry_buf = (CGEN_INSN_LIST *)
 139     xmalloc (count * sizeof (CGEN_INSN_LIST));
 140
 141   /* Add compiled in insns.
 142      Don't include the first one as it is a reserved entry.  */
 143   /* ??? It was the end of all hash chains, and also the special
 144      "invalid insn" marker.  May be able to do it differently now.  */
 145
 146   hash_entry_buf = hash_insn_array (cd,
 147                                     insn_table->init_entries + 1,
 148                                     insn_table->num_init_entries - 1,
 149                                     insn_table->entry_size,
 150                                     asm_hash_table, hash_entry_buf);
 151
 152   /* Add compiled in macro-insns.  */
 153
 154   hash_entry_buf = hash_insn_array (cd, macro_insn_table->init_entries,
 155                                     macro_insn_table->num_init_entries,
 156                                     macro_insn_table->entry_size,
 157                                     asm_hash_table, hash_entry_buf);
 158
 159   /* Add runtime added insns.
 160      Later added insns will be prefered over earlier ones.  */
 161
 162   hash_entry_buf = hash_insn_list (cd, insn_table->new_entries,
 163                                    asm_hash_table, hash_entry_buf);
 164
 165   /* Add runtime added macro-insns.  */
 166
 167   hash_insn_list (cd, macro_insn_table->new_entries,
 168                   asm_hash_table, hash_entry_buf);
 169
 170   cd->asm_hash_table = asm_hash_table;
 171   cd->asm_hash_table_entries = asm_hash_table_entries;
 172 }
 173
 174 /* Return the first entry in the hash list for INSN.  */
 175
 176 CGEN_INSN_LIST *
 177 cgen_asm_lookup_insn (CGEN_CPU_DESC cd, const char *insn)
 178 {
 179   unsigned int hash;
 180
 181   if (cd->asm_hash_table == NULL)
 182     build_asm_hash_table (cd);
 183
 184   hash = (* cd->asm_hash) (insn);
 185   return cd->asm_hash_table[hash];
 186 }
 187 \f
 188 /* Keyword parser.
 189    The result is NULL upon success or an error message.
 190    If successful, *STRP is updated to point passed the keyword.
 191
 192    ??? At present we have a static notion of how to pick out a keyword.
 193    Later we can allow a target to customize this if necessary [say by
 194    recording something in the keyword table].  */
 195
 196 const char *
 197 cgen_parse_keyword (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 198                     const char **strp,
 199                     CGEN_KEYWORD *keyword_table,
 200                     long *valuep)
 201 {
 202   const CGEN_KEYWORD_ENTRY *ke;
 203   char buf[256];
 204   const char *p,*start;
 205
 206   if (keyword_table->name_hash_table == NULL)
 207     (void) cgen_keyword_search_init (keyword_table, NULL);
 208
 209   p = start = *strp;
 210
 211   /* Allow any first character.  This is to make life easier for
 212      the fairly common case of suffixes, eg. 'ld.b.w', where the first
 213      character of the suffix ('.') is special.  */
 214   if (*p)
 215     ++p;
 216
 217   /* Allow letters, digits, and any special characters.  */
 218   while (((p - start) < (int) sizeof (buf))
 219          && *p
 220          && (ISALNUM (*p)
 221              || *p == '_'
 222              || strchr (keyword_table->nonalpha_chars, *p)))
 223     ++p;
 224
 225   if (p - start >= (int) sizeof (buf))
 226     {
 227       /* All non-empty CGEN keywords can fit into BUF.  The only thing
 228          we can match here is the empty keyword.  */
 229       buf[0] = 0;
 230     }
 231   else
 232     {
 233       memcpy (buf, start, p - start);
 234       buf[p - start] = 0;
 235     }
 236
 237   ke = cgen_keyword_lookup_name (keyword_table, buf);
 238
 239   if (ke != NULL)
 240     {
 241       *valuep = ke->value;
 242       /* Don't advance pointer if we recognized the null keyword.  */
 243       if (ke->name[0] != 0)
 244         *strp = p;
 245       return NULL;
 246     }
 247
 248   return "unrecognized keyword/register name";
 249 }
 250
 251 /* Parse a small signed integer parser.
 252    ??? VALUEP is not a bfd_vma * on purpose, though this is confusing.
 253    Note that if the caller expects a bfd_vma result, it should call
 254    cgen_parse_address.  */
 255
 256 const char *
 257 cgen_parse_signed_integer (CGEN_CPU_DESC cd,
 258                            const char **strp,
 259                            int opindex,
 260                            long *valuep)
 261 {
 262   bfd_vma value;
 263   enum cgen_parse_operand_result result;
 264   const char *errmsg;
 265
 266   errmsg = (* cd->parse_operand_fn)
 267     (cd, CGEN_PARSE_OPERAND_INTEGER, strp, opindex, BFD_RELOC_NONE,
 268      &result, &value);
 269   /* FIXME: Examine `result'.  */
 270   if (!errmsg)
 271     {
 272       /* Handle the case where a hex value is parsed on a 64-bit host.
 273          A value like 0xffffe000 is clearly intended to be a negative
 274          16-bit value, but on a 64-bit host it will be parsed by gas
 275          as 0x00000000ffffe000.
 276
 277          The shifts below are designed not to produce compile time
 278          warnings on a 32-bit host.  */
 279       if (sizeof (value) > 4
 280           && result == CGEN_PARSE_OPERAND_RESULT_NUMBER
 281           && value > 0
 282           && (value & 0x80000000)
 283           && ((value >> 31) == 1))
 284         value |= -1 << 31;
 285
 286       *valuep = value;
 287     }
 288   return errmsg;
 289 }
 290
 291 /* Parse a small unsigned integer parser.
 292    ??? VALUEP is not a bfd_vma * on purpose, though this is confusing.
 293    Note that if the caller expects a bfd_vma result, it should call
 294    cgen_parse_address.  */
 295
 296 const char *
 297 cgen_parse_unsigned_integer (CGEN_CPU_DESC cd,
 298                              const char **strp,
 299                              int opindex,
 300                              unsigned long *valuep)
 301 {
 302   bfd_vma value;
 303   enum cgen_parse_operand_result result;
 304   const char *errmsg;
 305
 306   errmsg = (* cd->parse_operand_fn)
 307     (cd, CGEN_PARSE_OPERAND_INTEGER, strp, opindex, BFD_RELOC_NONE,
 308      &result, &value);
 309   /* FIXME: Examine `result'.  */
 310   if (!errmsg)
 311     *valuep = value;
 312   return errmsg;
 313 }
 314
 315 /* Address parser.  */
 316
 317 const char *
 318 cgen_parse_address (CGEN_CPU_DESC cd,
 319                     const char **strp,
 320                     int opindex,
 321                     int opinfo,
 322                     enum cgen_parse_operand_result *resultp,
 323                     bfd_vma *valuep)
 324 {
 325   bfd_vma value;
 326   enum cgen_parse_operand_result result_type;
 327   const char *errmsg;
 328
 329   errmsg = (* cd->parse_operand_fn)
 330     (cd, CGEN_PARSE_OPERAND_ADDRESS, strp, opindex, opinfo,
 331      &result_type, &value);
 332   /* FIXME: Examine `result'.  */
 333   if (!errmsg)
 334     {
 335       if (resultp != NULL)
 336         *resultp = result_type;
 337       *valuep = value;
 338     }
 339   return errmsg;
 340 }
 341 \f
 342 /* Signed integer validation routine.  */
 343
 344 const char *
 345 cgen_validate_signed_integer (long value, long min, long max)
 346 {
 347   if (value < min || value > max)
 348     {
 349       static char buf[100];
 350
 351       /* xgettext:c-format */
 352       sprintf (buf, _("operand out of range (%ld not between %ld and %ld)"),
 353                       value, min, max);
 354       return buf;
 355     }
 356
 357   return NULL;
 358 }
 359
 360 /* Unsigned integer validation routine.
 361    Supplying `min' here may seem unnecessary, but we also want to handle
 362    cases where min != 0 (and max > LONG_MAX).  */
 363
 364 const char *
 365 cgen_validate_unsigned_integer (unsigned long value,
 366                                 unsigned long min,
 367                                 unsigned long max)
 368 {
 369   if (value < min || value > max)
 370     {
 371       static char buf[100];
 372
 373       /* xgettext:c-format */
 374       sprintf (buf, _("operand out of range (%lu not between %lu and %lu)"),
 375                value, min, max);
 376       return buf;
 377     }
 378
 379   return NULL;
 380 }