gas/config/tc-fr30.c

   1 /* tc-fr30.c -- Assembler for the Fujitsu FR30.
   2    Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2005
   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, 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include <stdio.h>
  23 #include "as.h"
  24 #include "safe-ctype.h"
  25 #include "subsegs.h"
  26 #include "symcat.h"
  27 #include "opcodes/fr30-desc.h"
  28 #include "opcodes/fr30-opc.h"
  29 #include "cgen.h"
  30
  31 /* Structure to hold all of the different components describing
  32    an individual instruction.  */
  33 typedef struct
  34 {
  35   const CGEN_INSN *     insn;
  36   const CGEN_INSN *     orig_insn;
  37   CGEN_FIELDS           fields;
  38 #if CGEN_INT_INSN_P
  39   CGEN_INSN_INT         buffer [1];
  40 #define INSN_VALUE(buf) (*(buf))
  41 #else
  42   unsigned char         buffer [CGEN_MAX_INSN_SIZE];
  43 #define INSN_VALUE(buf) (buf)
  44 #endif
  45   char *                addr;
  46   fragS *               frag;
  47   int                   num_fixups;
  48   fixS *                fixups [GAS_CGEN_MAX_FIXUPS];
  49   int                   indices [MAX_OPERAND_INSTANCES];
  50 }
  51 fr30_insn;
  52
  53 const char comment_chars[]        = ";";
  54 const char line_comment_chars[]   = "#";
  55 const char line_separator_chars[] = "|";
  56 const char EXP_CHARS[]            = "eE";
  57 const char FLT_CHARS[]            = "dD";
  58 \f
  59 #define FR30_SHORTOPTS ""
  60 const char * md_shortopts = FR30_SHORTOPTS;
  61
  62 struct option md_longopts[] =
  63 {
  64   {NULL, no_argument, NULL, 0}
  65 };
  66 size_t md_longopts_size = sizeof (md_longopts);
  67
  68 int
  69 md_parse_option (c, arg)
  70      int c ATTRIBUTE_UNUSED;
  71      char *arg ATTRIBUTE_UNUSED;
  72 {
  73   switch (c)
  74     {
  75     default:
  76       return 0;
  77     }
  78   return 1;
  79 }
  80
  81 void
  82 md_show_usage (stream)
  83   FILE * stream;
  84 {
  85   fprintf (stream, _(" FR30 specific command line options:\n"));
  86 }
  87
  88 /* The target specific pseudo-ops which we support.  */
  89 const pseudo_typeS md_pseudo_table[] =
  90 {
  91   { "word",     cons,           4 },
  92   { NULL,       NULL,           0 }
  93 };
  94
  95 \f
  96 void
  97 md_begin ()
  98 {
  99   /* Initialize the `cgen' interface.  */
 100
 101   /* Set the machine number and endian.  */
 102   gas_cgen_cpu_desc = fr30_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, 0,
 103                                           CGEN_CPU_OPEN_ENDIAN,
 104                                           CGEN_ENDIAN_BIG,
 105                                           CGEN_CPU_OPEN_END);
 106   fr30_cgen_init_asm (gas_cgen_cpu_desc);
 107
 108   /* This is a callback from cgen to gas to parse operands.  */
 109   cgen_set_parse_operand_fn (gas_cgen_cpu_desc, gas_cgen_parse_operand);
 110 }
 111
 112 void
 113 md_assemble (str)
 114      char *str;
 115 {
 116   static int last_insn_had_delay_slot = 0;
 117   fr30_insn insn;
 118   char *errmsg;
 119
 120   /* Initialize GAS's cgen interface for a new instruction.  */
 121   gas_cgen_init_parse ();
 122
 123   insn.insn = fr30_cgen_assemble_insn
 124     (gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg);
 125
 126   if (!insn.insn)
 127     {
 128       as_bad (errmsg);
 129       return;
 130     }
 131
 132   /* Doesn't really matter what we pass for RELAX_P here.  */
 133   gas_cgen_finish_insn (insn.insn, insn.buffer,
 134                         CGEN_FIELDS_BITSIZE (& insn.fields), 1, NULL);
 135
 136   /* Warn about invalid insns in delay slots.  */
 137   if (last_insn_had_delay_slot
 138       && CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_NOT_IN_DELAY_SLOT))
 139     as_warn (_("Instruction %s not allowed in a delay slot."),
 140              CGEN_INSN_NAME (insn.insn));
 141
 142   last_insn_had_delay_slot
 143     = CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_DELAY_SLOT);
 144 }
 145
 146 /* The syntax in the manual says constants begin with '#'.
 147    We just ignore it.  */
 148
 149 void
 150 md_operand (expressionP)
 151      expressionS * expressionP;
 152 {
 153   if (* input_line_pointer == '#')
 154     {
 155       input_line_pointer ++;
 156       expression (expressionP);
 157     }
 158 }
 159
 160 valueT
 161 md_section_align (segment, size)
 162      segT   segment;
 163      valueT size;
 164 {
 165   int align = bfd_get_section_alignment (stdoutput, segment);
 166   return ((size + (1 << align) - 1) & (-1 << align));
 167 }
 168
 169 symbolS *
 170 md_undefined_symbol (name)
 171   char *name ATTRIBUTE_UNUSED;
 172 {
 173   return 0;
 174 }
 175 \f
 176 /* Interface to relax_segment.  */
 177
 178 /* FIXME: Build table by hand, get it working, then machine generate.  */
 179
 180 const relax_typeS md_relax_table[] =
 181 {
 182 /* The fields are:
 183    1) most positive reach of this state,
 184    2) most negative reach of this state,
 185    3) how many bytes this mode will add to the size of the current frag
 186    4) which index into the table to try if we can't fit into this one.  */
 187
 188   /* The first entry must be unused because an `rlx_more' value of zero ends
 189      each list.  */
 190   {1, 1, 0, 0},
 191
 192   /* The displacement used by GAS is from the end of the 2 byte insn,
 193      so we subtract 2 from the following.  */
 194   /* 16 bit insn, 8 bit disp -> 10 bit range.
 195      This doesn't handle a branch in the right slot at the border:
 196      the "& -4" isn't taken into account.  It's not important enough to
 197      complicate things over it, so we subtract an extra 2 (or + 2 in -ve
 198      case).  */
 199   {511 - 2 - 2, -512 - 2 + 2, 0, 2 },
 200   /* 32 bit insn, 24 bit disp -> 26 bit range.  */
 201   {0x2000000 - 1 - 2, -0x2000000 - 2, 2, 0 },
 202   /* Same thing, but with leading nop for alignment.  */
 203   {0x2000000 - 1 - 2, -0x2000000 - 2, 4, 0 }
 204 };
 205
 206 /* Return an initial guess of the length by which a fragment must grow to
 207    hold a branch to reach its destination.
 208    Also updates fr_type/fr_subtype as necessary.
 209
 210    Called just before doing relaxation.
 211    Any symbol that is now undefined will not become defined.
 212    The guess for fr_var is ACTUALLY the growth beyond fr_fix.
 213    Whatever we do to grow fr_fix or fr_var contributes to our returned value.
 214    Although it may not be explicit in the frag, pretend fr_var starts with a
 215    0 value.  */
 216
 217 int
 218 md_estimate_size_before_relax (fragP, segment)
 219      fragS * fragP;
 220      segT    segment;
 221 {
 222   /* The only thing we have to handle here are symbols outside of the
 223      current segment.  They may be undefined or in a different segment in
 224      which case linker scripts may place them anywhere.
 225      However, we can't finish the fragment here and emit the reloc as insn
 226      alignment requirements may move the insn about.  */
 227
 228   if (S_GET_SEGMENT (fragP->fr_symbol) != segment)
 229     {
 230       /* The symbol is undefined in this segment.
 231          Change the relaxation subtype to the max allowable and leave
 232          all further handling to md_convert_frag.  */
 233       fragP->fr_subtype = 2;
 234
 235       {
 236         const CGEN_INSN * insn;
 237         int               i;
 238
 239         /* Update the recorded insn.
 240            Fortunately we don't have to look very far.
 241            FIXME: Change this to record in the instruction the next higher
 242            relaxable insn to use.  */
 243         for (i = 0, insn = fragP->fr_cgen.insn; i < 4; i++, insn++)
 244           {
 245             if ((strcmp (CGEN_INSN_MNEMONIC (insn),
 246                          CGEN_INSN_MNEMONIC (fragP->fr_cgen.insn))
 247                  == 0)
 248                 && CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED))
 249               break;
 250           }
 251         if (i == 4)
 252           abort ();
 253
 254         fragP->fr_cgen.insn = insn;
 255         return 2;
 256       }
 257     }
 258
 259   /* Return the size of the variable part of the frag.  */
 260   return md_relax_table[fragP->fr_subtype].rlx_length;
 261 }
 262
 263 /* *fragP has been relaxed to its final size, and now needs to have
 264    the bytes inside it modified to conform to the new size.
 265
 266    Called after relaxation is finished.
 267    fragP->fr_type == rs_machine_dependent.
 268    fragP->fr_subtype is the subtype of what the address relaxed to.  */
 269
 270 void
 271 md_convert_frag (abfd, sec, fragP)
 272   bfd *abfd ATTRIBUTE_UNUSED;
 273   segT sec ATTRIBUTE_UNUSED;
 274   fragS *fragP ATTRIBUTE_UNUSED;
 275 {
 276 }
 277 \f
 278 /* Functions concerning relocs.  */
 279
 280 /* The location from which a PC relative jump should be calculated,
 281    given a PC relative reloc.  */
 282
 283 long
 284 md_pcrel_from_section (fixP, sec)
 285      fixS * fixP;
 286      segT   sec;
 287 {
 288   if (fixP->fx_addsy != (symbolS *) NULL
 289       && (! S_IS_DEFINED (fixP->fx_addsy)
 290           || S_GET_SEGMENT (fixP->fx_addsy) != sec))
 291     {
 292       /* The symbol is undefined (or is defined but not in this section).
 293          Let the linker figure it out.  */
 294       return 0;
 295     }
 296
 297   return (fixP->fx_frag->fr_address + fixP->fx_where) & ~1;
 298 }
 299
 300 /* Return the bfd reloc type for OPERAND of INSN at fixup FIXP.
 301    Returns BFD_RELOC_NONE if no reloc type can be found.
 302    *FIXP may be modified if desired.  */
 303
 304 bfd_reloc_code_real_type
 305 md_cgen_lookup_reloc (insn, operand, fixP)
 306      const CGEN_INSN *insn ATTRIBUTE_UNUSED;
 307      const CGEN_OPERAND *operand;
 308      fixS *fixP;
 309 {
 310   switch (operand->type)
 311     {
 312     case FR30_OPERAND_LABEL9:  fixP->fx_pcrel = 1; return BFD_RELOC_FR30_9_PCREL;
 313     case FR30_OPERAND_LABEL12: fixP->fx_pcrel = 1; return BFD_RELOC_FR30_12_PCREL;
 314     case FR30_OPERAND_DISP10:  return BFD_RELOC_FR30_10_IN_8;
 315     case FR30_OPERAND_DISP9:   return BFD_RELOC_FR30_9_IN_8;
 316     case FR30_OPERAND_DISP8:   return BFD_RELOC_FR30_8_IN_8;
 317     case FR30_OPERAND_UDISP6:  return BFD_RELOC_FR30_6_IN_4;
 318     case FR30_OPERAND_I8:      return BFD_RELOC_8;
 319     case FR30_OPERAND_I32:     return BFD_RELOC_FR30_48;
 320     case FR30_OPERAND_I20:     return BFD_RELOC_FR30_20;
 321     default : /* avoid -Wall warning */
 322       break;
 323     }
 324
 325   return BFD_RELOC_NONE;
 326 }
 327 \f
 328 /* Write a value out to the object file, using the appropriate endianness.  */
 329
 330 void
 331 md_number_to_chars (buf, val, n)
 332      char * buf;
 333      valueT val;
 334      int    n;
 335 {
 336   number_to_chars_bigendian (buf, val, n);
 337 }
 338
 339 /* Turn a string in input_line_pointer into a floating point constant of type
 340    type, and store the appropriate bytes in *litP.  The number of LITTLENUMS
 341    emitted is stored in *sizeP .  An error message is returned, or NULL on OK.
 342 */
 343
 344 /* Equal to MAX_PRECISION in atof-ieee.c */
 345 #define MAX_LITTLENUMS 6
 346
 347 char *
 348 md_atof (type, litP, sizeP)
 349      char   type;
 350      char * litP;
 351      int *  sizeP;
 352 {
 353   int              i;
 354   int              prec;
 355   LITTLENUM_TYPE   words [MAX_LITTLENUMS];
 356   char *           t;
 357
 358   switch (type)
 359     {
 360     case 'f':
 361     case 'F':
 362     case 's':
 363     case 'S':
 364       prec = 2;
 365       break;
 366
 367     case 'd':
 368     case 'D':
 369     case 'r':
 370     case 'R':
 371       prec = 4;
 372       break;
 373
 374    /* FIXME: Some targets allow other format chars for bigger sizes here.  */
 375
 376     default:
 377       * sizeP = 0;
 378       return _("Bad call to md_atof()");
 379     }
 380
 381   t = atof_ieee (input_line_pointer, type, words);
 382   if (t)
 383     input_line_pointer = t;
 384   * sizeP = prec * sizeof (LITTLENUM_TYPE);
 385
 386   for (i = 0; i < prec; i++)
 387     {
 388       md_number_to_chars (litP, (valueT) words[i],
 389                           sizeof (LITTLENUM_TYPE));
 390       litP += sizeof (LITTLENUM_TYPE);
 391     }
 392
 393   return 0;
 394 }
 395
 396 /* Worker function for fr30_is_colon_insn().  */
 397 static char restore_colon PARAMS ((int));
 398
 399 static char
 400 restore_colon (advance_i_l_p_by)
 401      int advance_i_l_p_by;
 402 {
 403   char c;
 404
 405   /* Restore the colon, and advance input_line_pointer to
 406      the end of the new symbol.  */
 407   * input_line_pointer = ':';
 408   input_line_pointer += advance_i_l_p_by;
 409   c = * input_line_pointer;
 410   * input_line_pointer = 0;
 411
 412   return c;
 413 }
 414
 415 /* Determines if the symbol starting at START and ending in
 416    a colon that was at the location pointed to by INPUT_LINE_POINTER
 417    (but which has now been replaced bu a NUL) is in fact an
 418    LDI:8, LDI:20, LDI:32, CALL:D. JMP:D, RET:D or Bcc:D instruction.
 419    If it is, then it restores the colon, advances INPUT_LINE_POINTER
 420    to the real end of the instruction/symbol, and returns the character
 421    that really terminated the symbol.  Otherwise it returns 0.  */
 422 char
 423 fr30_is_colon_insn (start)
 424      char *  start;
 425 {
 426   char * i_l_p = input_line_pointer;
 427
 428   /* Check to see if the symbol parsed so far is 'ldi'  */
 429   if (   (start[0] != 'l' && start[0] != 'L')
 430       || (start[1] != 'd' && start[1] != 'D')
 431       || (start[2] != 'i' && start[2] != 'I')
 432       || start[3] != 0)
 433     {
 434       /* Nope - check to see a 'd' follows the colon.  */
 435       if (   (i_l_p[1] == 'd' || i_l_p[1] == 'D')
 436           && (i_l_p[2] == ' ' || i_l_p[2] == '\t' || i_l_p[2] == '\n'))
 437         {
 438           /* Yup - it might be delay slot instruction.  */
 439           int           i;
 440           static char * delay_insns [] =
 441           {
 442             "call", "jmp", "ret", "bra", "bno",
 443             "beq",  "bne", "bc",  "bnc", "bn",
 444             "bp",   "bv",  "bnv", "blt", "bge",
 445             "ble",  "bgt", "bls", "bhi"
 446           };
 447
 448           for (i = sizeof (delay_insns) / sizeof (delay_insns[0]); i--;)
 449             {
 450               char * insn = delay_insns[i];
 451               int    len  = strlen (insn);
 452
 453               if (start [len] != 0)
 454                 continue;
 455
 456               while (len --)
 457                 if (TOLOWER (start [len]) != insn [len])
 458                   break;
 459
 460               if (len == -1)
 461                 return restore_colon (1);
 462             }
 463         }
 464
 465       /* Nope - it is a normal label.  */
 466       return 0;
 467     }
 468
 469   /* Check to see if the text following the colon is '8' */
 470   if (i_l_p[1] == '8' && (i_l_p[2] == ' ' || i_l_p[2] == '\t'))
 471     return restore_colon (2);
 472
 473   /* Check to see if the text following the colon is '20' */
 474   else if (i_l_p[1] == '2' && i_l_p[2] =='0' && (i_l_p[3] == ' ' || i_l_p[3] == '\t'))
 475     return restore_colon (3);
 476
 477   /* Check to see if the text following the colon is '32' */
 478   else if (i_l_p[1] == '3' && i_l_p[2] =='2' && (i_l_p[3] == ' ' || i_l_p[3] == '\t'))
 479     return restore_colon (3);
 480
 481   return 0;
 482 }
 483
 484 bfd_boolean
 485 fr30_fix_adjustable (fixP)
 486    fixS * fixP;
 487 {
 488   /* We need the symbol name for the VTABLE entries */
 489   if (fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT
 490       || fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
 491     return 0;
 492
 493   return 1;
 494 }