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   int    old_fr_fix = fragP->fr_fix;
 269
 270   /* The only thing we have to handle here are symbols outside of the
 271      current segment.  They may be undefined or in a different segment in
 272      which case linker scripts may place them anywhere.
 273      However, we can't finish the fragment here and emit the reloc as insn
 274      alignment requirements may move the insn about.  */
 275
 276   if (S_GET_SEGMENT (fragP->fr_symbol) != segment)
 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 #else
 301       {
 302         const CGEN_INSN * insn;
 303         int               i;
 304
 305         /* Update the recorded insn.
 306            Fortunately we don't have to look very far.
 307            FIXME: Change this to record in the instruction the next higher
 308            relaxable insn to use.  */
 309         for (i = 0, insn = fragP->fr_cgen.insn; i < 4; i++, insn++)
 310           {
 311             if ((strcmp (CGEN_INSN_MNEMONIC (insn),
 312                          CGEN_INSN_MNEMONIC (fragP->fr_cgen.insn))
 313                  == 0)
 314                 && CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAX))
 315               break;
 316           }
 317         if (i == 4)
 318           abort ();
 319
 320         fragP->fr_cgen.insn = insn;
 321         return 2;
 322       }
 323 #endif
 324     }
 325
 326   return (fragP->fr_var + fragP->fr_fix - old_fr_fix);
 327 }
 328
 329 /* *fragP has been relaxed to its final size, and now needs to have
 330    the bytes inside it modified to conform to the new size.
 331
 332    Called after relaxation is finished.
 333    fragP->fr_type == rs_machine_dependent.
 334    fragP->fr_subtype is the subtype of what the address relaxed to.  */
 335
 336 void
 337 md_convert_frag (abfd, sec, fragP)
 338   bfd *   abfd;
 339   segT    sec;
 340   fragS * fragP;
 341 {
 342 #if 0
 343   char * opcode;
 344   char * displacement;
 345   int    target_address;
 346   int    opcode_address;
 347   int    extension;
 348   int    addend;
 349
 350   opcode = fragP->fr_opcode;
 351
 352   /* Address opcode resides at in file space.  */
 353   opcode_address = fragP->fr_address + fragP->fr_fix - 2;
 354
 355   switch (fragP->fr_subtype)
 356     {
 357     case 1 :
 358       extension = 0;
 359       displacement = & opcode[1];
 360       break;
 361     case 2 :
 362       opcode[0] |= 0x80;
 363       extension = 2;
 364       displacement = & opcode[1];
 365       break;
 366     case 3 :
 367       opcode[2] = opcode[0] | 0x80;
 368       md_number_to_chars (opcode, PAR_NOP_INSN, 2);
 369       opcode_address += 2;
 370       extension = 4;
 371       displacement = & opcode[3];
 372       break;
 373     default :
 374       abort ();
 375     }
 376
 377   if (S_GET_SEGMENT (fragP->fr_symbol) != sec)
 378     {
 379       /* symbol must be resolved by linker */
 380       if (fragP->fr_offset & 3)
 381         as_warn (_("Addend to unresolved symbol not on word boundary."));
 382       addend = fragP->fr_offset >> 2;
 383     }
 384   else
 385     {
 386       /* Address we want to reach in file space.  */
 387       target_address = S_GET_VALUE (fragP->fr_symbol) + fragP->fr_offset;
 388       target_address += symbol_get_frag (fragP->fr_symbol)->fr_address;
 389       addend = (target_address - (opcode_address & -4)) >> 2;
 390     }
 391
 392   /* Create a relocation for symbols that must be resolved by the linker.
 393      Otherwise output the completed insn.  */
 394
 395   if (S_GET_SEGMENT (fragP->fr_symbol) != sec)
 396     {
 397       assert (fragP->fr_subtype != 1);
 398       assert (fragP->fr_cgen.insn != 0);
 399       gas_cgen_record_fixup (fragP,
 400                              /* Offset of branch insn in frag.  */
 401                              fragP->fr_fix + extension - 4,
 402                              fragP->fr_cgen.insn,
 403                              4 /*length*/,
 404                              /* FIXME: quick hack */
 405 #if 0
 406                              CGEN_OPERAND_ENTRY (fragP->fr_cgen.opindex),
 407 #else
 408                              CGEN_OPERAND_ENTRY (FR30_OPERAND_DISP24),
 409 #endif
 410                              fragP->fr_cgen.opinfo,
 411                              fragP->fr_symbol, fragP->fr_offset);
 412     }
 413
 414 #define SIZE_FROM_RELAX_STATE(n) ((n) == 1 ? 1 : 3)
 415
 416   md_number_to_chars (displacement, (valueT) addend,
 417                       SIZE_FROM_RELAX_STATE (fragP->fr_subtype));
 418
 419   fragP->fr_fix += extension;
 420 #endif
 421 }
 422 \f
 423 /* Functions concerning relocs.  */
 424
 425 /* The location from which a PC relative jump should be calculated,
 426    given a PC relative reloc.  */
 427
 428 long
 429 md_pcrel_from_section (fixP, sec)
 430      fixS * fixP;
 431      segT   sec;
 432 {
 433   if (fixP->fx_addsy != (symbolS *) NULL
 434       && (! S_IS_DEFINED (fixP->fx_addsy)
 435           || S_GET_SEGMENT (fixP->fx_addsy) != sec))
 436     {
 437       /* The symbol is undefined (or is defined but not in this section).
 438          Let the linker figure it out.  */
 439       return 0;
 440     }
 441
 442   return (fixP->fx_frag->fr_address + fixP->fx_where) & ~1;
 443 }
 444
 445 /* Return the bfd reloc type for OPERAND of INSN at fixup FIXP.
 446    Returns BFD_RELOC_NONE if no reloc type can be found.
 447    *FIXP may be modified if desired.  */
 448
 449 bfd_reloc_code_real_type
 450 md_cgen_lookup_reloc (insn, operand, fixP)
 451      const CGEN_INSN *    insn;
 452      const CGEN_OPERAND * operand;
 453      fixS *               fixP;
 454 {
 455   switch (operand->type)
 456     {
 457     case FR30_OPERAND_LABEL9:  fixP->fx_pcrel = 1; return BFD_RELOC_FR30_9_PCREL;
 458     case FR30_OPERAND_LABEL12: fixP->fx_pcrel = 1; return BFD_RELOC_FR30_12_PCREL;
 459     case FR30_OPERAND_DISP10:  return BFD_RELOC_FR30_10_IN_8;
 460     case FR30_OPERAND_DISP9:   return BFD_RELOC_FR30_9_IN_8;
 461     case FR30_OPERAND_DISP8:   return BFD_RELOC_FR30_8_IN_8;
 462     case FR30_OPERAND_UDISP6:  return BFD_RELOC_FR30_6_IN_4;
 463     case FR30_OPERAND_I8:      return BFD_RELOC_8;
 464     case FR30_OPERAND_I32:     return BFD_RELOC_FR30_48;
 465     case FR30_OPERAND_I20:     return BFD_RELOC_FR30_20;
 466     default : /* avoid -Wall warning */
 467       break;
 468     }
 469
 470   return BFD_RELOC_NONE;
 471 }
 472
 473 /* See whether we need to force a relocation into the output file.
 474    This is used to force out switch and PC relative relocations when
 475    relaxing.  */
 476
 477 int
 478 fr30_force_relocation (fix)
 479      fixS * fix;
 480 {
 481   if (   fix->fx_r_type == BFD_RELOC_VTABLE_INHERIT
 482       || fix->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
 483     return 1;
 484
 485   return 0;
 486 }
 487 \f
 488 /* Write a value out to the object file, using the appropriate endianness.  */
 489
 490 void
 491 md_number_to_chars (buf, val, n)
 492      char * buf;
 493      valueT val;
 494      int    n;
 495 {
 496   number_to_chars_bigendian (buf, val, n);
 497 }
 498
 499 /* Turn a string in input_line_pointer into a floating point constant of type
 500    type, and store the appropriate bytes in *litP.  The number of LITTLENUMS
 501    emitted is stored in *sizeP .  An error message is returned, or NULL on OK.
 502 */
 503
 504 /* Equal to MAX_PRECISION in atof-ieee.c */
 505 #define MAX_LITTLENUMS 6
 506
 507 char *
 508 md_atof (type, litP, sizeP)
 509      char   type;
 510      char * litP;
 511      int *  sizeP;
 512 {
 513   int              i;
 514   int              prec;
 515   LITTLENUM_TYPE   words [MAX_LITTLENUMS];
 516   char *           t;
 517   char *           atof_ieee ();
 518
 519   switch (type)
 520     {
 521     case 'f':
 522     case 'F':
 523     case 's':
 524     case 'S':
 525       prec = 2;
 526       break;
 527
 528     case 'd':
 529     case 'D':
 530     case 'r':
 531     case 'R':
 532       prec = 4;
 533       break;
 534
 535    /* FIXME: Some targets allow other format chars for bigger sizes here.  */
 536
 537     default:
 538       * sizeP = 0;
 539       return _("Bad call to md_atof()");
 540     }
 541
 542   t = atof_ieee (input_line_pointer, type, words);
 543   if (t)
 544     input_line_pointer = t;
 545   * sizeP = prec * sizeof (LITTLENUM_TYPE);
 546
 547   for (i = 0; i < prec; i++)
 548     {
 549       md_number_to_chars (litP, (valueT) words[i],
 550                           sizeof (LITTLENUM_TYPE));
 551       litP += sizeof (LITTLENUM_TYPE);
 552     }
 553
 554   return 0;
 555 }
 556
 557 /* Worker function for fr30_is_colon_insn().  */
 558 static char
 559 restore_colon (advance_i_l_p_by)
 560      int advance_i_l_p_by;
 561 {
 562   char c;
 563
 564   /* Restore the colon, and advance input_line_pointer to
 565      the end of the new symbol.  */
 566   * input_line_pointer = ':';
 567   input_line_pointer += advance_i_l_p_by;
 568   c = * input_line_pointer;
 569   * input_line_pointer = 0;
 570
 571   return c;
 572 }
 573
 574 /* Determines if the symbol starting at START and ending in
 575    a colon that was at the location pointed to by INPUT_LINE_POINTER
 576    (but which has now been replaced bu a NUL) is in fact an
 577    LDI:8, LDI:20, LDI:32, CALL:D. JMP:D, RET:D or Bcc:D instruction.
 578    If it is, then it restores the colon, advances INPUT_LINE_POINTER
 579    to the real end of the instruction/symbol, and returns the character
 580    that really terminated the symbol.  Otherwise it returns 0.  */
 581 char
 582 fr30_is_colon_insn (start)
 583      char *  start;
 584 {
 585   char * i_l_p = input_line_pointer;
 586
 587   /* Check to see if the symbol parsed so far is 'ldi'  */
 588   if (   (start[0] != 'l' && start[0] != 'L')
 589       || (start[1] != 'd' && start[1] != 'D')
 590       || (start[2] != 'i' && start[2] != 'I')
 591       || start[3] != 0)
 592     {
 593       /* Nope - check to see a 'd' follows the colon.  */
 594       if (   (i_l_p[1] == 'd' || i_l_p[1] == 'D')
 595           && (i_l_p[2] == ' ' || i_l_p[2] == '\t' || i_l_p[2] == '\n'))
 596         {
 597           /* Yup - it might be delay slot instruction.  */
 598           int           i;
 599           static char * delay_insns [] =
 600           {
 601             "call", "jmp", "ret", "bra", "bno",
 602             "beq",  "bne", "bc",  "bnc", "bn",
 603             "bp",   "bv",  "bnv", "blt", "bge",
 604             "ble",  "bgt", "bls", "bhi"
 605           };
 606
 607           for (i = sizeof (delay_insns) / sizeof (delay_insns[0]); i--;)
 608             {
 609               char * insn = delay_insns[i];
 610               int    len  = strlen (insn);
 611
 612               if (start [len] != 0)
 613                 continue;
 614
 615               while (len --)
 616                 if (tolower (start [len]) != insn [len])
 617                   break;
 618
 619               if (len == -1)
 620                 return restore_colon (1);
 621             }
 622         }
 623
 624       /* Nope - it is a normal label.  */
 625       return 0;
 626     }
 627
 628   /* Check to see if the text following the colon is '8' */
 629   if (i_l_p[1] == '8' && (i_l_p[2] == ' ' || i_l_p[2] == '\t'))
 630     return restore_colon (2);
 631
 632   /* Check to see if the text following the colon is '20' */
 633   else if (i_l_p[1] == '2' && i_l_p[2] =='0' && (i_l_p[3] == ' ' || i_l_p[3] == '\t'))
 634     return restore_colon (3);
 635
 636   /* Check to see if the text following the colon is '32' */
 637   else if (i_l_p[1] == '3' && i_l_p[2] =='2' && (i_l_p[3] == ' ' || i_l_p[3] == '\t'))
 638     return restore_colon (3);
 639
 640   return 0;
 641 }
 642
 643 boolean
 644 fr30_fix_adjustable (fixP)
 645    fixS * fixP;
 646 {
 647   if (fixP->fx_addsy == NULL)
 648     return 1;
 649
 650 #if 0
 651   /* Prevent all adjustments to global symbols.  */
 652   if (S_IS_EXTERN (fixP->fx_addsy))
 653     return 0;
 654
 655   if (S_IS_WEAK (fixP->fx_addsy))
 656     return 0;
 657 #endif
 658
 659   /* We need the symbol name for the VTABLE entries */
 660   if (   fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT
 661       || fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
 662     return 0;
 663
 664   return 1;
 665 }