gas/config/tc-fr30.c

   1 /* tc-fr30.c -- Assembler for the Fujitsu FR30.
   2    Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2005, 2006
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GAS, the GNU Assembler.
   6
   7    GAS 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 2, or (at your option)
  10    any later version.
  11
  12    GAS is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with GAS; see the file COPYING.  If not, write to
  19    the Free Software Foundation, 51 Franklin Street - Fifth Floor,
  20    Boston, MA 02110-1301, USA.  */
  21
  22 #include "as.h"
  23 #include "safe-ctype.h"
  24 #include "subsegs.h"
  25 #include "symcat.h"
  26 #include "opcodes/fr30-desc.h"
  27 #include "opcodes/fr30-opc.h"
  28 #include "cgen.h"
  29
  30 /* Structure to hold all of the different components describing
  31    an individual instruction.  */
  32 typedef struct
  33 {
  34   const CGEN_INSN *     insn;
  35   const CGEN_INSN *     orig_insn;
  36   CGEN_FIELDS           fields;
  37 #if CGEN_INT_INSN_P
  38   CGEN_INSN_INT         buffer [1];
  39 #define INSN_VALUE(buf) (*(buf))
  40 #else
  41   unsigned char         buffer [CGEN_MAX_INSN_SIZE];
  42 #define INSN_VALUE(buf) (buf)
  43 #endif
  44   char *                addr;
  45   fragS *               frag;
  46   int                   num_fixups;
  47   fixS *                fixups [GAS_CGEN_MAX_FIXUPS];
  48   int                   indices [MAX_OPERAND_INSTANCES];
  49 }
  50 fr30_insn;
  51
  52 const char comment_chars[]        = ";";
  53 const char line_comment_chars[]   = "#";
  54 const char line_separator_chars[] = "|";
  55 const char EXP_CHARS[]            = "eE";
  56 const char FLT_CHARS[]            = "dD";
  57 \f
  58 #define FR30_SHORTOPTS ""
  59 const char * md_shortopts = FR30_SHORTOPTS;
  60
  61 struct option md_longopts[] =
  62 {
  63   {NULL, no_argument, NULL, 0}
  64 };
  65 size_t md_longopts_size = sizeof (md_longopts);
  66
  67 int
  68 md_parse_option (int c ATTRIBUTE_UNUSED,
  69                  char *arg ATTRIBUTE_UNUSED)
  70 {
  71   switch (c)
  72     {
  73     default:
  74       return 0;
  75     }
  76   return 1;
  77 }
  78
  79 void
  80 md_show_usage (FILE * stream)
  81 {
  82   fprintf (stream, _(" FR30 specific command line options:\n"));
  83 }
  84
  85 /* The target specific pseudo-ops which we support.  */
  86 const pseudo_typeS md_pseudo_table[] =
  87 {
  88   { "word",     cons,           4 },
  89   { NULL,       NULL,           0 }
  90 };
  91
  92 \f
  93 void
  94 md_begin (void)
  95 {
  96   /* Initialize the `cgen' interface.  */
  97
  98   /* Set the machine number and endian.  */
  99   gas_cgen_cpu_desc = fr30_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, 0,
 100                                           CGEN_CPU_OPEN_ENDIAN,
 101                                           CGEN_ENDIAN_BIG,
 102                                           CGEN_CPU_OPEN_END);
 103   fr30_cgen_init_asm (gas_cgen_cpu_desc);
 104
 105   /* This is a callback from cgen to gas to parse operands.  */
 106   cgen_set_parse_operand_fn (gas_cgen_cpu_desc, gas_cgen_parse_operand);
 107 }
 108
 109 void
 110 md_assemble (char *str)
 111 {
 112   static int last_insn_had_delay_slot = 0;
 113   fr30_insn insn;
 114   char *errmsg;
 115
 116   /* Initialize GAS's cgen interface for a new instruction.  */
 117   gas_cgen_init_parse ();
 118
 119   insn.insn = fr30_cgen_assemble_insn
 120     (gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg);
 121
 122   if (!insn.insn)
 123     {
 124       as_bad (errmsg);
 125       return;
 126     }
 127
 128   /* Doesn't really matter what we pass for RELAX_P here.  */
 129   gas_cgen_finish_insn (insn.insn, insn.buffer,
 130                         CGEN_FIELDS_BITSIZE (& insn.fields), 1, NULL);
 131
 132   /* Warn about invalid insns in delay slots.  */
 133   if (last_insn_had_delay_slot
 134       && CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_NOT_IN_DELAY_SLOT))
 135     as_warn (_("Instruction %s not allowed in a delay slot."),
 136              CGEN_INSN_NAME (insn.insn));
 137
 138   last_insn_had_delay_slot
 139     = CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_DELAY_SLOT);
 140 }
 141
 142 /* The syntax in the manual says constants begin with '#'.
 143    We just ignore it.  */
 144
 145 void
 146 md_operand (expressionS * expressionP)
 147 {
 148   if (* input_line_pointer == '#')
 149     {
 150       input_line_pointer ++;
 151       expression (expressionP);
 152     }
 153 }
 154
 155 valueT
 156 md_section_align (segT segment, valueT size)
 157 {
 158   int align = bfd_get_section_alignment (stdoutput, segment);
 159
 160   return ((size + (1 << align) - 1) & (-1 << align));
 161 }
 162
 163 symbolS *
 164 md_undefined_symbol (char *name ATTRIBUTE_UNUSED)
 165 {
 166   return NULL;
 167 }
 168 \f
 169 /* Interface to relax_segment.  */
 170
 171 /* FIXME: Build table by hand, get it working, then machine generate.  */
 172
 173 const relax_typeS md_relax_table[] =
 174 {
 175 /* The fields are:
 176    1) most positive reach of this state,
 177    2) most negative reach of this state,
 178    3) how many bytes this mode will add to the size of the current frag
 179    4) which index into the table to try if we can't fit into this one.  */
 180
 181   /* The first entry must be unused because an `rlx_more' value of zero ends
 182      each list.  */
 183   {1, 1, 0, 0},
 184
 185   /* The displacement used by GAS is from the end of the 2 byte insn,
 186      so we subtract 2 from the following.  */
 187   /* 16 bit insn, 8 bit disp -> 10 bit range.
 188      This doesn't handle a branch in the right slot at the border:
 189      the "& -4" isn't taken into account.  It's not important enough to
 190      complicate things over it, so we subtract an extra 2 (or + 2 in -ve
 191      case).  */
 192   {511 - 2 - 2, -512 - 2 + 2, 0, 2 },
 193   /* 32 bit insn, 24 bit disp -> 26 bit range.  */
 194   {0x2000000 - 1 - 2, -0x2000000 - 2, 2, 0 },
 195   /* Same thing, but with leading nop for alignment.  */
 196   {0x2000000 - 1 - 2, -0x2000000 - 2, 4, 0 }
 197 };
 198
 199 /* Return an initial guess of the length by which a fragment must grow to
 200    hold a branch to reach its destination.
 201    Also updates fr_type/fr_subtype as necessary.
 202
 203    Called just before doing relaxation.
 204    Any symbol that is now undefined will not become defined.
 205    The guess for fr_var is ACTUALLY the growth beyond fr_fix.
 206    Whatever we do to grow fr_fix or fr_var contributes to our returned value.
 207    Although it may not be explicit in the frag, pretend fr_var starts with a
 208    0 value.  */
 209
 210 int
 211 md_estimate_size_before_relax (fragS * fragP, segT segment)
 212 {
 213   /* The only thing we have to handle here are symbols outside of the
 214      current segment.  They may be undefined or in a different segment in
 215      which case linker scripts may place them anywhere.
 216      However, we can't finish the fragment here and emit the reloc as insn
 217      alignment requirements may move the insn about.  */
 218
 219   if (S_GET_SEGMENT (fragP->fr_symbol) != segment)
 220     {
 221       /* The symbol is undefined in this segment.
 222          Change the relaxation subtype to the max allowable and leave
 223          all further handling to md_convert_frag.  */
 224       fragP->fr_subtype = 2;
 225
 226       {
 227         const CGEN_INSN * insn;
 228         int               i;
 229
 230         /* Update the recorded insn.
 231            Fortunately we don't have to look very far.
 232            FIXME: Change this to record in the instruction the next higher
 233            relaxable insn to use.  */
 234         for (i = 0, insn = fragP->fr_cgen.insn; i < 4; i++, insn++)
 235           {
 236             if ((strcmp (CGEN_INSN_MNEMONIC (insn),
 237                          CGEN_INSN_MNEMONIC (fragP->fr_cgen.insn))
 238                  == 0)
 239                 && CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED))
 240               break;
 241           }
 242         if (i == 4)
 243           abort ();
 244
 245         fragP->fr_cgen.insn = insn;
 246         return 2;
 247       }
 248     }
 249
 250   /* Return the size of the variable part of the frag.  */
 251   return md_relax_table[fragP->fr_subtype].rlx_length;
 252 }
 253
 254 /* *fragP has been relaxed to its final size, and now needs to have
 255    the bytes inside it modified to conform to the new size.
 256
 257    Called after relaxation is finished.
 258    fragP->fr_type == rs_machine_dependent.
 259    fragP->fr_subtype is the subtype of what the address relaxed to.  */
 260
 261 void
 262 md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED,
 263                  segT sec ATTRIBUTE_UNUSED,
 264                  fragS *fragP ATTRIBUTE_UNUSED)
 265 {
 266 }
 267 \f
 268 /* Functions concerning relocs.  */
 269
 270 /* The location from which a PC relative jump should be calculated,
 271    given a PC relative reloc.  */
 272
 273 long
 274 md_pcrel_from_section (fixS * fixP, segT sec)
 275 {
 276   if (fixP->fx_addsy != (symbolS *) NULL
 277       && (! S_IS_DEFINED (fixP->fx_addsy)
 278           || S_GET_SEGMENT (fixP->fx_addsy) != sec))
 279     /* The symbol is undefined (or is defined but not in this section).
 280        Let the linker figure it out.  */
 281     return 0;
 282
 283   return (fixP->fx_frag->fr_address + fixP->fx_where) & ~1;
 284 }
 285
 286 /* Return the bfd reloc type for OPERAND of INSN at fixup FIXP.
 287    Returns BFD_RELOC_NONE if no reloc type can be found.
 288    *FIXP may be modified if desired.  */
 289
 290 bfd_reloc_code_real_type
 291 md_cgen_lookup_reloc (const CGEN_INSN *insn ATTRIBUTE_UNUSED,
 292                       const CGEN_OPERAND *operand,
 293                       fixS *fixP)
 294 {
 295   switch (operand->type)
 296     {
 297     case FR30_OPERAND_LABEL9:  fixP->fx_pcrel = 1; return BFD_RELOC_FR30_9_PCREL;
 298     case FR30_OPERAND_LABEL12: fixP->fx_pcrel = 1; return BFD_RELOC_FR30_12_PCREL;
 299     case FR30_OPERAND_DISP10:  return BFD_RELOC_FR30_10_IN_8;
 300     case FR30_OPERAND_DISP9:   return BFD_RELOC_FR30_9_IN_8;
 301     case FR30_OPERAND_DISP8:   return BFD_RELOC_FR30_8_IN_8;
 302     case FR30_OPERAND_UDISP6:  return BFD_RELOC_FR30_6_IN_4;
 303     case FR30_OPERAND_I8:      return BFD_RELOC_8;
 304     case FR30_OPERAND_I32:     return BFD_RELOC_FR30_48;
 305     case FR30_OPERAND_I20:     return BFD_RELOC_FR30_20;
 306     default : /* Avoid -Wall warning.  */
 307       break;
 308     }
 309
 310   return BFD_RELOC_NONE;
 311 }
 312 \f
 313 /* Write a value out to the object file, using the appropriate endianness.  */
 314
 315 void
 316 md_number_to_chars (char * buf, valueT val, int n)
 317 {
 318   number_to_chars_bigendian (buf, val, n);
 319 }
 320
 321 /* Turn a string in input_line_pointer into a floating point constant of type
 322    type, and store the appropriate bytes in *litP.  The number of LITTLENUMS
 323    emitted is stored in *sizeP .  An error message is returned, or NULL on OK.
 324 */
 325
 326 /* Equal to MAX_PRECISION in atof-ieee.c.  */
 327 #define MAX_LITTLENUMS 6
 328
 329 char *
 330 md_atof (int type, char * litP, int * sizeP)
 331 {
 332   int              i;
 333   int              prec;
 334   LITTLENUM_TYPE   words [MAX_LITTLENUMS];
 335   char *           t;
 336
 337   switch (type)
 338     {
 339     case 'f':
 340     case 'F':
 341     case 's':
 342     case 'S':
 343       prec = 2;
 344       break;
 345
 346     case 'd':
 347     case 'D':
 348     case 'r':
 349     case 'R':
 350       prec = 4;
 351       break;
 352
 353    /* FIXME: Some targets allow other format chars for bigger sizes here.  */
 354
 355     default:
 356       * sizeP = 0;
 357       return _("Bad call to md_atof()");
 358     }
 359
 360   t = atof_ieee (input_line_pointer, type, words);
 361   if (t)
 362     input_line_pointer = t;
 363   * sizeP = prec * sizeof (LITTLENUM_TYPE);
 364
 365   for (i = 0; i < prec; i++)
 366     {
 367       md_number_to_chars (litP, (valueT) words[i],
 368                           sizeof (LITTLENUM_TYPE));
 369       litP += sizeof (LITTLENUM_TYPE);
 370     }
 371
 372   return 0;
 373 }
 374
 375 /* Worker function for fr30_is_colon_insn().  */
 376 static char
 377 restore_colon (int advance_i_l_p_by)
 378 {
 379   char c;
 380
 381   /* Restore the colon, and advance input_line_pointer to
 382      the end of the new symbol.  */
 383   * input_line_pointer = ':';
 384   input_line_pointer += advance_i_l_p_by;
 385   c = * input_line_pointer;
 386   * input_line_pointer = 0;
 387
 388   return c;
 389 }
 390
 391 /* Determines if the symbol starting at START and ending in
 392    a colon that was at the location pointed to by INPUT_LINE_POINTER
 393    (but which has now been replaced bu a NUL) is in fact an
 394    LDI:8, LDI:20, LDI:32, CALL:D. JMP:D, RET:D or Bcc:D instruction.
 395    If it is, then it restores the colon, advances INPUT_LINE_POINTER
 396    to the real end of the instruction/symbol, and returns the character
 397    that really terminated the symbol.  Otherwise it returns 0.  */
 398 char
 399 fr30_is_colon_insn (char *  start)
 400 {
 401   char * i_l_p = input_line_pointer;
 402
 403   /* Check to see if the symbol parsed so far is 'ldi'.  */
 404   if (   (start[0] != 'l' && start[0] != 'L')
 405       || (start[1] != 'd' && start[1] != 'D')
 406       || (start[2] != 'i' && start[2] != 'I')
 407       || start[3] != 0)
 408     {
 409       /* Nope - check to see a 'd' follows the colon.  */
 410       if (   (i_l_p[1] == 'd' || i_l_p[1] == 'D')
 411           && (i_l_p[2] == ' ' || i_l_p[2] == '\t' || i_l_p[2] == '\n'))
 412         {
 413           /* Yup - it might be delay slot instruction.  */
 414           int           i;
 415           static char * delay_insns [] =
 416           {
 417             "call", "jmp", "ret", "bra", "bno",
 418             "beq",  "bne", "bc",  "bnc", "bn",
 419             "bp",   "bv",  "bnv", "blt", "bge",
 420             "ble",  "bgt", "bls", "bhi"
 421           };
 422
 423           for (i = sizeof (delay_insns) / sizeof (delay_insns[0]); i--;)
 424             {
 425               char * insn = delay_insns[i];
 426               int    len  = strlen (insn);
 427
 428               if (start [len] != 0)
 429                 continue;
 430
 431               while (len --)
 432                 if (TOLOWER (start [len]) != insn [len])
 433                   break;
 434
 435               if (len == -1)
 436                 return restore_colon (1);
 437             }
 438         }
 439
 440       /* Nope - it is a normal label.  */
 441       return 0;
 442     }
 443
 444   /* Check to see if the text following the colon is '8'.  */
 445   if (i_l_p[1] == '8' && (i_l_p[2] == ' ' || i_l_p[2] == '\t'))
 446     return restore_colon (2);
 447
 448   /* Check to see if the text following the colon is '20'.  */
 449   else if (i_l_p[1] == '2' && i_l_p[2] =='0' && (i_l_p[3] == ' ' || i_l_p[3] == '\t'))
 450     return restore_colon (3);
 451
 452   /* Check to see if the text following the colon is '32'.  */
 453   else if (i_l_p[1] == '3' && i_l_p[2] =='2' && (i_l_p[3] == ' ' || i_l_p[3] == '\t'))
 454     return restore_colon (3);
 455
 456   return 0;
 457 }
 458
 459 bfd_boolean
 460 fr30_fix_adjustable (fixS * fixP)
 461 {
 462   /* We need the symbol name for the VTABLE entries.  */
 463   if (fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT
 464       || fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
 465     return 0;
 466
 467   return 1;
 468 }