gas/config/tc-fr30.c

   1 /* tc-fr30.c -- Assembler for the Fujitsu FR30.
   2    Copyright 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
   3
   4    This file is part of GAS, the GNU Assembler.
   5
   6    GAS 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 2, or (at your option)
   9    any later version.
  10
  11    GAS is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with GAS; see the file COPYING.  If not, write to
  18    the Free Software Foundation, 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include <stdio.h>
  22 #include <ctype.h>
  23 #include "as.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 (c, arg)
  69      int    c;
  70      char * arg;
  71 {
  72   switch (c)
  73     {
  74     default:
  75       return 0;
  76     }
  77   return 1;
  78 }
  79
  80 void
  81 md_show_usage (stream)
  82   FILE * stream;
  83 {
  84   fprintf (stream, _(" FR30 specific command line options:\n"));
  85 }
  86
  87 /* The target specific pseudo-ops which we support.  */
  88 const pseudo_typeS md_pseudo_table[] =
  89 {
  90   { "word",     cons,           4 },
  91   { NULL,       NULL,           0 }
  92 };
  93
  94 \f
  95 void
  96 md_begin ()
  97 {
  98   flagword applicable;
  99   segT     seg;
 100   subsegT  subseg;
 101
 102   /* Initialize the `cgen' interface.  */
 103
 104   /* Set the machine number and endian.  */
 105   gas_cgen_cpu_desc = fr30_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, 0,
 106                                           CGEN_CPU_OPEN_ENDIAN,
 107                                           CGEN_ENDIAN_BIG,
 108                                           CGEN_CPU_OPEN_END);
 109   fr30_cgen_init_asm (gas_cgen_cpu_desc);
 110
 111   /* This is a callback from cgen to gas to parse operands.  */
 112   cgen_set_parse_operand_fn (gas_cgen_cpu_desc, gas_cgen_parse_operand);
 113 }
 114
 115 void
 116 md_assemble (str)
 117      char * str;
 118 {
 119   static int last_insn_had_delay_slot = 0;
 120   fr30_insn insn;
 121   char *    errmsg;
 122   char *    str2 = NULL;
 123
 124   /* Initialize GAS's cgen interface for a new instruction.  */
 125   gas_cgen_init_parse ();
 126
 127   insn.insn = fr30_cgen_assemble_insn
 128     (gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg);
 129
 130   if (!insn.insn)
 131     {
 132       as_bad (errmsg);
 133       return;
 134     }
 135
 136   /* Doesn't really matter what we pass for RELAX_P here.  */
 137   gas_cgen_finish_insn (insn.insn, insn.buffer,
 138                         CGEN_FIELDS_BITSIZE (& insn.fields), 1, NULL);
 139
 140   /* Warn about invalid insns in delay slots.  */
 141   if (last_insn_had_delay_slot
 142       && CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_NOT_IN_DELAY_SLOT))
 143     as_warn (_("Instruction %s not allowed in a delay slot."),
 144              CGEN_INSN_NAME (insn.insn));
 145
 146   last_insn_had_delay_slot
 147     = CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_DELAY_SLOT);
 148 }
 149
 150 /* The syntax in the manual says constants begin with '#'.
 151    We just ignore it.  */
 152
 153 void
 154 md_operand (expressionP)
 155      expressionS * expressionP;
 156 {
 157   if (* input_line_pointer == '#')
 158     {
 159       input_line_pointer ++;
 160       expression (expressionP);
 161     }
 162 }
 163
 164 valueT
 165 md_section_align (segment, size)
 166      segT   segment;
 167      valueT size;
 168 {
 169   int align = bfd_get_section_alignment (stdoutput, segment);
 170   return ((size + (1 << align) - 1) & (-1 << align));
 171 }
 172
 173 symbolS *
 174 md_undefined_symbol (name)
 175   char * name;
 176 {
 177   return 0;
 178 }
 179 \f
 180 /* Interface to relax_segment.  */
 181
 182 /* FIXME: Build table by hand, get it working, then machine generate.  */
 183
 184 const relax_typeS md_relax_table[] =
 185 {
 186 /* The fields are:
 187    1) most positive reach of this state,
 188    2) most negative reach of this state,
 189    3) how many bytes this mode will add to the size of the current frag
 190    4) which index into the table to try if we can't fit into this one.  */
 191
 192   /* The first entry must be unused because an `rlx_more' value of zero ends
 193      each list.  */
 194   {1, 1, 0, 0},
 195
 196   /* The displacement used by GAS is from the end of the 2 byte insn,
 197      so we subtract 2 from the following.  */
 198   /* 16 bit insn, 8 bit disp -> 10 bit range.
 199      This doesn't handle a branch in the right slot at the border:
 200      the "& -4" isn't taken into account.  It's not important enough to
 201      complicate things over it, so we subtract an extra 2 (or + 2 in -ve
 202      case).  */
 203   {511 - 2 - 2, -512 - 2 + 2, 0, 2 },
 204   /* 32 bit insn, 24 bit disp -> 26 bit range.  */
 205   {0x2000000 - 1 - 2, -0x2000000 - 2, 2, 0 },
 206   /* Same thing, but with leading nop for alignment.  */
 207   {0x2000000 - 1 - 2, -0x2000000 - 2, 4, 0 }
 208 };
 209
 210 long
 211 fr30_relax_frag (segment, fragP, stretch)
 212      segT    segment;
 213      fragS * fragP;
 214      long    stretch;
 215 {
 216   /* Address of branch insn.  */
 217   long address = fragP->fr_address + fragP->fr_fix - 2;
 218   long growth = 0;
 219
 220   /* Keep 32 bit insns aligned on 32 bit boundaries.  */
 221   if (fragP->fr_subtype == 2)
 222     {
 223       if ((address & 3) != 0)
 224         {
 225           fragP->fr_subtype = 3;
 226           growth = 2;
 227         }
 228     }
 229   else if (fragP->fr_subtype == 3)
 230     {
 231       if ((address & 3) == 0)
 232         {
 233           fragP->fr_subtype = 2;
 234           growth = -2;
 235         }
 236     }
 237   else
 238     {
 239       growth = relax_frag (segment, fragP, stretch);
 240
 241       /* Long jump on odd halfword boundary?  */
 242       if (fragP->fr_subtype == 2 && (address & 3) != 0)
 243         {
 244           fragP->fr_subtype = 3;
 245           growth += 2;
 246         }
 247     }
 248
 249   return growth;
 250 }
 251
 252 /* Return an initial guess of the length by which a fragment must grow to
 253    hold a branch to reach its destination.
 254    Also updates fr_type/fr_subtype as necessary.
 255
 256    Called just before doing relaxation.
 257    Any symbol that is now undefined will not become defined.
 258    The guess for fr_var is ACTUALLY the growth beyond fr_fix.
 259    Whatever we do to grow fr_fix or fr_var contributes to our returned value.
 260    Although it may not be explicit in the frag, pretend fr_var starts with a
 261    0 value.  */
 262
 263 int
 264 md_estimate_size_before_relax (fragP, segment)
 265      fragS * fragP;
 266      segT    segment;
 267 {
 268   /* The only thing we have to handle here are symbols outside of the
 269      current segment.  They may be undefined or in a different segment in
 270      which case linker scripts may place them anywhere.
 271      However, we can't finish the fragment here and emit the reloc as insn
 272      alignment requirements may move the insn about.  */
 273
 274   if (S_GET_SEGMENT (fragP->fr_symbol) != segment)
 275     {
 276       int    old_fr_fix = fragP->fr_fix;
 277
 278       /* The symbol is undefined in this segment.
 279          Change the relaxation subtype to the max allowable and leave
 280          all further handling to md_convert_frag.  */
 281       fragP->fr_subtype = 2;
 282
 283 #if 0 /* Can't use this, but leave in for illustration.  */
 284       /* Change 16 bit insn to 32 bit insn.  */
 285       fragP->fr_opcode[0] |= 0x80;
 286
 287       /* Increase known (fixed) size of fragment.  */
 288       fragP->fr_fix += 2;
 289
 290       /* Create a relocation for it.  */
 291       fix_new (fragP, old_fr_fix, 4,
 292                fragP->fr_symbol,
 293                fragP->fr_offset, 1 /* pcrel */,
 294                /* FIXME: Can't use a real BFD reloc here.
 295                   gas_cgen_md_apply_fix3 can't handle it.  */
 296                BFD_RELOC_FR30_26_PCREL);
 297
 298       /* Mark this fragment as finished.  */
 299       frag_wane (fragP);
 300       return fragP->fr_fix - old_fr_fix;
 301 #else
 302       {
 303         const CGEN_INSN * insn;
 304         int               i;
 305
 306         /* Update the recorded insn.
 307            Fortunately we don't have to look very far.
 308            FIXME: Change this to record in the instruction the next higher
 309            relaxable insn to use.  */
 310         for (i = 0, insn = fragP->fr_cgen.insn; i < 4; i++, insn++)
 311           {
 312             if ((strcmp (CGEN_INSN_MNEMONIC (insn),
 313                          CGEN_INSN_MNEMONIC (fragP->fr_cgen.insn))
 314                  == 0)
 315                 && CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAX))
 316               break;
 317           }
 318         if (i == 4)
 319           abort ();
 320
 321         fragP->fr_cgen.insn = insn;
 322         return 2;
 323       }
 324 #endif
 325     }
 326
 327   /* Return the size of the variable part of the frag.  */
 328   return md_relax_table[fragP->fr_subtype].rlx_length;
 329 }
 330
 331 /* *fragP has been relaxed to its final size, and now needs to have
 332    the bytes inside it modified to conform to the new size.
 333
 334    Called after relaxation is finished.
 335    fragP->fr_type == rs_machine_dependent.
 336    fragP->fr_subtype is the subtype of what the address relaxed to.  */
 337
 338 void
 339 md_convert_frag (abfd, sec, fragP)
 340   bfd *   abfd;
 341   segT    sec;
 342   fragS * fragP;
 343 {
 344 #if 0
 345   char * opcode;
 346   char * displacement;
 347   int    target_address;
 348   int    opcode_address;
 349   int    extension;
 350   int    addend;
 351
 352   opcode = fragP->fr_opcode;
 353
 354   /* Address opcode resides at in file space.  */
 355   opcode_address = fragP->fr_address + fragP->fr_fix - 2;
 356
 357   switch (fragP->fr_subtype)
 358     {
 359     case 1 :
 360       extension = 0;
 361       displacement = & opcode[1];
 362       break;
 363     case 2 :
 364       opcode[0] |= 0x80;
 365       extension = 2;
 366       displacement = & opcode[1];
 367       break;
 368     case 3 :
 369       opcode[2] = opcode[0] | 0x80;
 370       md_number_to_chars (opcode, PAR_NOP_INSN, 2);
 371       opcode_address += 2;
 372       extension = 4;
 373       displacement = & opcode[3];
 374       break;
 375     default :
 376       abort ();
 377     }
 378
 379   if (S_GET_SEGMENT (fragP->fr_symbol) != sec)
 380     {
 381       /* symbol must be resolved by linker */
 382       if (fragP->fr_offset & 3)
 383         as_warn (_("Addend to unresolved symbol not on word boundary."));
 384       addend = fragP->fr_offset >> 2;
 385     }
 386   else
 387     {
 388       /* Address we want to reach in file space.  */
 389       target_address = S_GET_VALUE (fragP->fr_symbol) + fragP->fr_offset;
 390       target_address += symbol_get_frag (fragP->fr_symbol)->fr_address;
 391       addend = (target_address - (opcode_address & -4)) >> 2;
 392     }
 393
 394   /* Create a relocation for symbols that must be resolved by the linker.
 395      Otherwise output the completed insn.  */
 396
 397   if (S_GET_SEGMENT (fragP->fr_symbol) != sec)
 398     {
 399       assert (fragP->fr_subtype != 1);
 400       assert (fragP->fr_cgen.insn != 0);
 401       gas_cgen_record_fixup (fragP,
 402                              /* Offset of branch insn in frag.  */
 403                              fragP->fr_fix + extension - 4,
 404                              fragP->fr_cgen.insn,
 405                              4 /*length*/,
 406                              /* FIXME: quick hack */
 407 #if 0
 408                              CGEN_OPERAND_ENTRY (fragP->fr_cgen.opindex),
 409 #else
 410                              CGEN_OPERAND_ENTRY (FR30_OPERAND_DISP24),
 411 #endif
 412                              fragP->fr_cgen.opinfo,
 413                              fragP->fr_symbol, fragP->fr_offset);
 414     }
 415
 416 #define SIZE_FROM_RELAX_STATE(n) ((n) == 1 ? 1 : 3)
 417
 418   md_number_to_chars (displacement, (valueT) addend,
 419                       SIZE_FROM_RELAX_STATE (fragP->fr_subtype));
 420
 421   fragP->fr_fix += extension;
 422 #endif
 423 }
 424 \f
 425 /* Functions concerning relocs.  */
 426
 427 /* The location from which a PC relative jump should be calculated,
 428    given a PC relative reloc.  */
 429
 430 long
 431 md_pcrel_from_section (fixP, sec)
 432      fixS * fixP;
 433      segT   sec;
 434 {
 435   if (fixP->fx_addsy != (symbolS *) NULL
 436       && (! S_IS_DEFINED (fixP->fx_addsy)
 437           || S_GET_SEGMENT (fixP->fx_addsy) != sec))
 438     {
 439       /* The symbol is undefined (or is defined but not in this section).
 440          Let the linker figure it out.  */
 441       return 0;
 442     }
 443
 444   return (fixP->fx_frag->fr_address + fixP->fx_where) & ~1;
 445 }
 446
 447 /* Return the bfd reloc type for OPERAND of INSN at fixup FIXP.
 448    Returns BFD_RELOC_NONE if no reloc type can be found.
 449    *FIXP may be modified if desired.  */
 450
 451 bfd_reloc_code_real_type
 452 md_cgen_lookup_reloc (insn, operand, fixP)
 453      const CGEN_INSN *    insn;
 454      const CGEN_OPERAND * operand;
 455      fixS *               fixP;
 456 {
 457   switch (operand->type)
 458     {
 459     case FR30_OPERAND_LABEL9:  fixP->fx_pcrel = 1; return BFD_RELOC_FR30_9_PCREL;
 460     case FR30_OPERAND_LABEL12: fixP->fx_pcrel = 1; return BFD_RELOC_FR30_12_PCREL;
 461     case FR30_OPERAND_DISP10:  return BFD_RELOC_FR30_10_IN_8;
 462     case FR30_OPERAND_DISP9:   return BFD_RELOC_FR30_9_IN_8;
 463     case FR30_OPERAND_DISP8:   return BFD_RELOC_FR30_8_IN_8;
 464     case FR30_OPERAND_UDISP6:  return BFD_RELOC_FR30_6_IN_4;
 465     case FR30_OPERAND_I8:      return BFD_RELOC_8;
 466     case FR30_OPERAND_I32:     return BFD_RELOC_FR30_48;
 467     case FR30_OPERAND_I20:     return BFD_RELOC_FR30_20;
 468     default : /* avoid -Wall warning */
 469       break;
 470     }
 471
 472   return BFD_RELOC_NONE;
 473 }
 474
 475 /* See whether we need to force a relocation into the output file.
 476    This is used to force out switch and PC relative relocations when
 477    relaxing.  */
 478
 479 int
 480 fr30_force_relocation (fix)
 481      fixS * fix;
 482 {
 483   if (   fix->fx_r_type == BFD_RELOC_VTABLE_INHERIT
 484       || fix->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
 485     return 1;
 486
 487   return 0;
 488 }
 489 \f
 490 /* Write a value out to the object file, using the appropriate endianness.  */
 491
 492 void
 493 md_number_to_chars (buf, val, n)
 494      char * buf;
 495      valueT val;
 496      int    n;
 497 {
 498   number_to_chars_bigendian (buf, val, n);
 499 }
 500
 501 /* Turn a string in input_line_pointer into a floating point constant of type
 502    type, and store the appropriate bytes in *litP.  The number of LITTLENUMS
 503    emitted is stored in *sizeP .  An error message is returned, or NULL on OK.
 504 */
 505
 506 /* Equal to MAX_PRECISION in atof-ieee.c */
 507 #define MAX_LITTLENUMS 6
 508
 509 char *
 510 md_atof (type, litP, sizeP)
 511      char   type;
 512      char * litP;
 513      int *  sizeP;
 514 {
 515   int              i;
 516   int              prec;
 517   LITTLENUM_TYPE   words [MAX_LITTLENUMS];
 518   char *           t;
 519   char *           atof_ieee ();
 520
 521   switch (type)
 522     {
 523     case 'f':
 524     case 'F':
 525     case 's':
 526     case 'S':
 527       prec = 2;
 528       break;
 529
 530     case 'd':
 531     case 'D':
 532     case 'r':
 533     case 'R':
 534       prec = 4;
 535       break;
 536
 537    /* FIXME: Some targets allow other format chars for bigger sizes here.  */
 538
 539     default:
 540       * sizeP = 0;
 541       return _("Bad call to md_atof()");
 542     }
 543
 544   t = atof_ieee (input_line_pointer, type, words);
 545   if (t)
 546     input_line_pointer = t;
 547   * sizeP = prec * sizeof (LITTLENUM_TYPE);
 548
 549   for (i = 0; i < prec; i++)
 550     {
 551       md_number_to_chars (litP, (valueT) words[i],
 552                           sizeof (LITTLENUM_TYPE));
 553       litP += sizeof (LITTLENUM_TYPE);
 554     }
 555
 556   return 0;
 557 }
 558
 559 /* Worker function for fr30_is_colon_insn().  */
 560 static char
 561 restore_colon (advance_i_l_p_by)
 562      int advance_i_l_p_by;
 563 {
 564   char c;
 565
 566   /* Restore the colon, and advance input_line_pointer to
 567      the end of the new symbol.  */
 568   * input_line_pointer = ':';
 569   input_line_pointer += advance_i_l_p_by;
 570   c = * input_line_pointer;
 571   * input_line_pointer = 0;
 572
 573   return c;
 574 }
 575
 576 /* Determines if the symbol starting at START and ending in
 577    a colon that was at the location pointed to by INPUT_LINE_POINTER
 578    (but which has now been replaced bu a NUL) is in fact an
 579    LDI:8, LDI:20, LDI:32, CALL:D. JMP:D, RET:D or Bcc:D instruction.
 580    If it is, then it restores the colon, advances INPUT_LINE_POINTER
 581    to the real end of the instruction/symbol, and returns the character
 582    that really terminated the symbol.  Otherwise it returns 0.  */
 583 char
 584 fr30_is_colon_insn (start)
 585      char *  start;
 586 {
 587   char * i_l_p = input_line_pointer;
 588
 589   /* Check to see if the symbol parsed so far is 'ldi'  */
 590   if (   (start[0] != 'l' && start[0] != 'L')
 591       || (start[1] != 'd' && start[1] != 'D')
 592       || (start[2] != 'i' && start[2] != 'I')
 593       || start[3] != 0)
 594     {
 595       /* Nope - check to see a 'd' follows the colon.  */
 596       if (   (i_l_p[1] == 'd' || i_l_p[1] == 'D')
 597           && (i_l_p[2] == ' ' || i_l_p[2] == '\t' || i_l_p[2] == '\n'))
 598         {
 599           /* Yup - it might be delay slot instruction.  */
 600           int           i;
 601           static char * delay_insns [] =
 602           {
 603             "call", "jmp", "ret", "bra", "bno",
 604             "beq",  "bne", "bc",  "bnc", "bn",
 605             "bp",   "bv",  "bnv", "blt", "bge",
 606             "ble",  "bgt", "bls", "bhi"
 607           };
 608
 609           for (i = sizeof (delay_insns) / sizeof (delay_insns[0]); i--;)
 610             {
 611               char * insn = delay_insns[i];
 612               int    len  = strlen (insn);
 613
 614               if (start [len] != 0)
 615                 continue;
 616
 617               while (len --)
 618                 if (tolower (start [len]) != insn [len])
 619                   break;
 620
 621               if (len == -1)
 622                 return restore_colon (1);
 623             }
 624         }
 625
 626       /* Nope - it is a normal label.  */
 627       return 0;
 628     }
 629
 630   /* Check to see if the text following the colon is '8' */
 631   if (i_l_p[1] == '8' && (i_l_p[2] == ' ' || i_l_p[2] == '\t'))
 632     return restore_colon (2);
 633
 634   /* Check to see if the text following the colon is '20' */
 635   else if (i_l_p[1] == '2' && i_l_p[2] =='0' && (i_l_p[3] == ' ' || i_l_p[3] == '\t'))
 636     return restore_colon (3);
 637
 638   /* Check to see if the text following the colon is '32' */
 639   else if (i_l_p[1] == '3' && i_l_p[2] =='2' && (i_l_p[3] == ' ' || i_l_p[3] == '\t'))
 640     return restore_colon (3);
 641
 642   return 0;
 643 }
 644
 645 boolean
 646 fr30_fix_adjustable (fixP)
 647    fixS * fixP;
 648 {
 649   if (fixP->fx_addsy == NULL)
 650     return 1;
 651
 652 #if 0
 653   /* Prevent all adjustments to global symbols.  */
 654   if (S_IS_EXTERN (fixP->fx_addsy))
 655     return 0;
 656
 657   if (S_IS_WEAK (fixP->fx_addsy))
 658     return 0;
 659 #endif
 660
 661   /* We need the symbol name for the VTABLE entries */
 662   if (   fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT
 663       || fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
 664     return 0;
 665
 666   return 1;
 667 }