gas/config/tc-or32.c

   1 /* Assembly backend for the OpenRISC 1000.
   2    Copyright (C) 2002, 2003, 2005, 2007
   3    Free Software Foundation, Inc.
   4    Contributed by Damjan Lampret <lampret@opencores.org>.
   5    Modified bu Johan Rydberg, <johan.rydberg@netinsight.se>.
   6    Based upon a29k port.
   7
   8    This file is part of GAS, the GNU Assembler.
   9
  10    GAS is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3, or (at your option)
  13    any later version.
  14
  15    GAS is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with GAS; see the file COPYING.  If not, write to
  22    the Free Software Foundation, 51 Franklin Street - Fifth Floor,
  23    Boston, MA 02110-1301, USA.  */
  24
  25 /* tc-a29k.c used as a template.  */
  26
  27 #include "safe-ctype.h"
  28 #include "as.h"
  29 #include "opcode/or32.h"
  30 #include "elf/or32.h"
  31
  32 #define DEBUG 0
  33
  34 #ifndef REGISTER_PREFIX
  35 #define REGISTER_PREFIX   '%'
  36 #endif
  37
  38 /* Make it easier to clone this machine desc into another one.  */
  39 #define machine_opcode  or32_opcode
  40 #define machine_opcodes or32_opcodes
  41 #define machine_ip      or32_ip
  42 #define machine_it      or32_it
  43
  44 /* Handle of the OPCODE hash table.  */
  45 static struct hash_control *op_hash = NULL;
  46
  47 struct machine_it
  48 {
  49   char *          error;
  50   unsigned long   opcode;
  51   struct nlist *  nlistp;
  52   expressionS     exp;
  53   int             pcrel;
  54   int             reloc_offset;   /* Offset of reloc within insn.  */
  55   int             reloc;
  56 }
  57 the_insn;
  58
  59 const pseudo_typeS md_pseudo_table[] =
  60 {
  61   {"align",   s_align_bytes,  4 },
  62   {"space",   s_space,        0 },
  63   {"cputype", s_ignore,       0 },
  64   {"reg",     s_lsym,         0 },  /* Register equate, same as equ.  */
  65   {"sect",    s_ignore,       0 },  /* Creation of coff sections.  */
  66   {"proc",    s_ignore,       0 },  /* Start of a function.  */
  67   {"endproc", s_ignore,       0 },  /* Function end.  */
  68   {"word",    cons,           4 },
  69   {NULL,      0,              0 },
  70 };
  71
  72 int md_short_jump_size  = 4;
  73 int md_long_jump_size   = 4;
  74
  75 /* This array holds the chars that always start a comment.
  76    If the pre-processor is disabled, these aren't very useful.  */
  77 const char comment_chars[] = "#";
  78
  79 /* This array holds the chars that only start a comment at the beginning of
  80    a line.  If the line seems to have the form '# 123 filename'
  81    .line and .file directives will appear in the pre-processed output.  */
  82 /* Note that input_file.c hand checks for '#' at the beginning of the
  83    first line of the input file.  This is because the compiler outputs
  84    #NO_APP at the beginning of its output.  */
  85 /* Also note that comments like this one will always work.  */
  86 const char line_comment_chars[] = "#";
  87
  88 /* We needed an unused char for line separation to work around the
  89    lack of macros, using sed and such.  */
  90 const char line_separator_chars[] = ";";
  91
  92 /* Chars that can be used to separate mant from exp in floating point nums.  */
  93 const char EXP_CHARS[] = "eE";
  94
  95 /* Chars that mean this number is a floating point constant.
  96    As in 0f12.456
  97    or    0d1.2345e12.  */
  98 const char FLT_CHARS[] = "rRsSfFdDxXpP";
  99
 100 /* "l.jalr r9" precalculated opcode.  */
 101 static unsigned long jalr_r9_opcode;
 102
 103 static void machine_ip (char *);
 104
 105
 106 /* Set bits in machine opcode according to insn->encoding
 107    description and passed operand.  */
 108
 109 static void
 110 encode (const struct machine_opcode *insn,
 111         unsigned long *opcode,
 112         signed long param_val,
 113         char param_ch)
 114 {
 115   int opc_pos = 0;
 116   int param_pos = 0;
 117   char *enc;
 118
 119 #if DEBUG
 120   printf ("    encode:  opcode=%.8lx  param_val=%.8lx abs=%.8lx param_ch=%c\n",
 121           *opcode, param_val, abs (param_val), param_ch);
 122 #endif
 123   for (enc = insn->encoding; *enc != '\0'; enc++)
 124     if (*enc == param_ch)
 125       {
 126         if (enc - 2 >= insn->encoding && (*(enc - 2) == '0') && (*(enc - 1) == 'x'))
 127           continue;
 128         else
 129           param_pos ++;
 130       }
 131
 132   opc_pos = 32;
 133
 134   for (enc = insn->encoding; *enc != '\0';)
 135     {
 136       if ((*enc == '0') && (*(enc + 1) == 'x'))
 137         {
 138           int tmp = strtol (enc, NULL, 16);
 139
 140           opc_pos -= 4;
 141           *opcode |= tmp << opc_pos;
 142           enc += 3;
 143         }
 144       else if ((*enc == '0') || (*enc == '-'))
 145         {
 146           opc_pos--;
 147           enc++;
 148         }
 149       else if (*enc == '1')
 150         {
 151           opc_pos--;
 152           *opcode |= 1 << opc_pos;
 153           enc++;
 154         }
 155       else if (*enc == param_ch)
 156         {
 157           opc_pos--;
 158           param_pos--;
 159           *opcode |= ((param_val >> param_pos) & 0x1) << opc_pos;
 160           enc++;
 161         }
 162       else if (ISALPHA (*enc))
 163         {
 164           opc_pos--;
 165           enc++;
 166         }
 167       else
 168         enc++;
 169     }
 170
 171 #if DEBUG
 172   printf ("    opcode=%.8lx\n", *opcode);
 173 #endif
 174 }
 175
 176 /* This function is called once, at assembler startup time.  It should
 177    set up all the tables, etc., that the MD part of the assembler will
 178    need.  */
 179
 180 void
 181 md_begin (void)
 182 {
 183   const char *retval = NULL;
 184   int lose = 0;
 185   int skipnext = 0;
 186   unsigned int i;
 187
 188   /* Hash up all the opcodes for fast use later.  */
 189   op_hash = hash_new ();
 190
 191   for (i = 0; i < or32_num_opcodes; i++)
 192     {
 193       const char *name = machine_opcodes[i].name;
 194
 195       if (skipnext)
 196         {
 197           skipnext = 0;
 198           continue;
 199         }
 200
 201       retval = hash_insert (op_hash, name, (void *) &machine_opcodes[i]);
 202       if (retval != NULL)
 203         {
 204           fprintf (stderr, "internal error: can't hash `%s': %s\n",
 205                    machine_opcodes[i].name, retval);
 206           lose = 1;
 207         }
 208     }
 209
 210   if (lose)
 211     as_fatal (_("Broken assembler.  No assembly attempted."));
 212
 213   encode (&machine_opcodes[insn_index ("l.jalr")], &jalr_r9_opcode, 9, 'B');
 214 }
 215
 216 /* Returns non zero if instruction is to be used.  */
 217
 218 static int
 219 check_invalid_opcode (unsigned long opcode)
 220 {
 221   return opcode == jalr_r9_opcode;
 222 }
 223
 224 /* Assemble a single instruction.  Its label has already been handled
 225    by the generic front end.  We just parse opcode and operands, and
 226    produce the bytes of data and relocation.  */
 227
 228 void
 229 md_assemble (char *str)
 230 {
 231   char *toP;
 232
 233 #if DEBUG
 234   printf ("NEW INSTRUCTION\n");
 235 #endif
 236
 237   know (str);
 238   machine_ip (str);
 239   toP = frag_more (4);
 240
 241   /* Put out the opcode.  */
 242   md_number_to_chars (toP, the_insn.opcode, 4);
 243
 244   /* Put out the symbol-dependent stuff.  */
 245   if (the_insn.reloc != BFD_RELOC_NONE)
 246     {
 247       fix_new_exp (frag_now,
 248                    (toP - frag_now->fr_literal + the_insn.reloc_offset),
 249                    4,   /* size */
 250                    &the_insn.exp,
 251                    the_insn.pcrel,
 252                    the_insn.reloc);
 253     }
 254 }
 255
 256 /* This is true of the we have issued a "lo(" or "hi"(.  */
 257 static int waiting_for_shift = 0;
 258
 259 static int mask_or_shift = 0;
 260
 261 static char *
 262 parse_operand (char *s, expressionS *operandp, int opt)
 263 {
 264   char *save = input_line_pointer;
 265   char *new;
 266
 267 #if DEBUG
 268   printf ("  PROCESS NEW OPERAND(%s) == %c (%d)\n", s, opt ? opt : '!', opt);
 269 #endif
 270
 271   input_line_pointer = s;
 272
 273   if (strncasecmp (s, "HI(", 3) == 0)
 274     {
 275       waiting_for_shift = 1;
 276       mask_or_shift = BFD_RELOC_HI16;
 277
 278       input_line_pointer += 3;
 279     }
 280   else if (strncasecmp (s, "LO(", 3) == 0)
 281     {
 282       mask_or_shift = BFD_RELOC_LO16;
 283
 284       input_line_pointer += 3;
 285     }
 286   else
 287     mask_or_shift = 0;
 288
 289   if ((*s == '(') && (*(s+1) == 'r'))
 290     s++;
 291
 292   if ((*s == 'r') && ISDIGIT (*(s + 1)))
 293     {
 294       operandp->X_add_number = strtol (s + 1, NULL, 10);
 295       operandp->X_op = O_register;
 296       for (; (*s != ',') && (*s != '\0');)
 297         s++;
 298       input_line_pointer = save;
 299       return s;
 300     }
 301
 302   expression (operandp);
 303
 304   if (operandp->X_op == O_absent)
 305     {
 306       if (! opt)
 307         as_bad (_("missing operand"));
 308       else
 309         {
 310           operandp->X_add_number = 0;
 311           operandp->X_op = O_constant;
 312         }
 313     }
 314
 315   new = input_line_pointer;
 316   input_line_pointer = save;
 317
 318 #if DEBUG
 319   printf ("  %s=parse_operand(%s): operandp->X_op = %u\n", new, s, operandp->X_op);
 320 #endif
 321
 322   return new;
 323 }
 324
 325 /* Instruction parsing.  Takes a string containing the opcode.
 326    Operands are at input_line_pointer.  Output is in the_insn.
 327    Warnings or errors are generated.  */
 328
 329 static void
 330 machine_ip (char *str)
 331 {
 332   char *s;
 333   const char *args;
 334   const struct machine_opcode *insn;
 335   char *argsStart;
 336   unsigned long opcode;
 337   expressionS the_operand;
 338   expressionS *operand = &the_operand;
 339   unsigned int regno;
 340   int reloc = BFD_RELOC_NONE;
 341
 342 #if DEBUG
 343   printf ("machine_ip(%s)\n", str);
 344 #endif
 345
 346   s = str;
 347   for (; ISALNUM (*s) || *s == '.'; ++s)
 348     if (ISUPPER (*s))
 349       *s = TOLOWER (*s);
 350
 351   switch (*s)
 352     {
 353     case '\0':
 354       break;
 355
 356     case ' ':     /* FIXME-SOMEDAY more whitespace.  */
 357       *s++ = '\0';
 358       break;
 359
 360     default:
 361       as_bad (_("unknown opcode1: `%s'"), str);
 362       return;
 363     }
 364
 365   if ((insn = (struct machine_opcode *) hash_find (op_hash, str)) == NULL)
 366     {
 367       as_bad (_("unknown opcode2 `%s'."), str);
 368       return;
 369     }
 370
 371   argsStart = s;
 372   opcode = 0;
 373   memset (&the_insn, '\0', sizeof (the_insn));
 374   the_insn.reloc = BFD_RELOC_NONE;
 375
 376   reloc = BFD_RELOC_NONE;
 377
 378   /* Build the opcode, checking as we go to make sure that the
 379      operands match.
 380
 381      If an operand matches, we modify the_insn or opcode appropriately,
 382      and do a "continue".  If an operand fails to match, we "break".  */
 383   if (insn->args[0] != '\0')
 384     /* Prime the pump.  */
 385     s = parse_operand (s, operand, insn->args[0] == 'I');
 386
 387   for (args = insn->args;; ++args)
 388     {
 389 #if DEBUG
 390       printf ("  args = %s\n", args);
 391 #endif
 392       switch (*args)
 393         {
 394         case '\0':    /* End of args.  */
 395           /* We have have 0 args, do the bazoooka!  */
 396           if (args == insn->args)
 397             encode (insn, &opcode, 0, 0);
 398
 399           if (*s == '\0')
 400             {
 401               /* We are truly done.  */
 402               the_insn.opcode = opcode;
 403               if (check_invalid_opcode (opcode))
 404                 as_bad (_("instruction not allowed: %s"), str);
 405               return;
 406             }
 407           as_bad (_("too many operands: %s"), s);
 408           break;
 409
 410         case ',':   /* Must match a comma.  */
 411           if (*s++ == ',')
 412             {
 413               reloc = BFD_RELOC_NONE;
 414
 415               /* Parse next operand.  */
 416               s = parse_operand (s, operand, args[1] == 'I');
 417 #if DEBUG
 418               printf ("    ',' case: operand->X_add_number = %d, *args = %s, *s = %s\n",
 419                       operand->X_add_number, args, s);
 420 #endif
 421               continue;
 422             }
 423           break;
 424
 425         case '(':   /* Must match a (.  */
 426           s = parse_operand (s, operand, args[1] == 'I');
 427           continue;
 428
 429         case ')':   /* Must match a ).  */
 430           continue;
 431
 432         case 'r':   /* A general register.  */
 433           args++;
 434
 435           if (operand->X_op != O_register)
 436             break;    /* Only registers.  */
 437
 438           know (operand->X_add_symbol == 0);
 439           know (operand->X_op_symbol == 0);
 440           regno = operand->X_add_number;
 441           encode (insn, &opcode, regno, *args);
 442 #if DEBUG
 443           printf ("    r: operand->X_op = %d\n", operand->X_op);
 444 #endif
 445           continue;
 446
 447         default:
 448           /* if (! ISALPHA (*args))
 449                break;  */   /* Only immediate values.  */
 450
 451           if (mask_or_shift)
 452             {
 453 #if DEBUG
 454               printf ("mask_or_shift = %d\n", mask_or_shift);
 455 #endif
 456               reloc = mask_or_shift;
 457             }
 458           mask_or_shift = 0;
 459
 460           if (strncasecmp (args, "LO(", 3) == 0)
 461             {
 462 #if DEBUG
 463               printf ("reloc_const\n");
 464 #endif
 465               reloc = BFD_RELOC_LO16;
 466             }
 467           else if (strncasecmp (args, "HI(", 3) == 0)
 468             {
 469 #if DEBUG
 470               printf ("reloc_consth\n");
 471 #endif
 472               reloc = BFD_RELOC_HI16;
 473             }
 474
 475           if (*s == '(')
 476             operand->X_op = O_constant;
 477           else if (*s == ')')
 478             s += 1;
 479 #if DEBUG
 480           printf ("    default case: operand->X_add_number = %d, *args = %s, *s = %s\n", operand->X_add_number, args, s);
 481 #endif
 482           if (operand->X_op == O_constant)
 483             {
 484               if (reloc == BFD_RELOC_NONE)
 485                 {
 486                   bfd_vma v, mask;
 487
 488                   mask = 0x3ffffff;
 489                   v = abs (operand->X_add_number) & ~ mask;
 490                   if (v)
 491                     as_bad (_("call/jmp target out of range (1)"));
 492                 }
 493
 494               if (reloc == BFD_RELOC_HI16)
 495                 operand->X_add_number = ((operand->X_add_number >> 16) & 0xffff);
 496
 497               the_insn.pcrel = 0;
 498               encode (insn, &opcode, operand->X_add_number, *args);
 499  /*             the_insn.reloc = BFD_RELOC_NONE; */
 500               continue;
 501             }
 502
 503           if (reloc == BFD_RELOC_NONE)
 504             the_insn.reloc = BFD_RELOC_32_GOT_PCREL;
 505           else
 506             the_insn.reloc = reloc;
 507
 508           /* the_insn.reloc = insn->reloc;  */
 509 #if DEBUG
 510           printf ("    reloc sym=%d\n", the_insn.reloc);
 511           printf ("    BFD_RELOC_NONE=%d\n", BFD_RELOC_NONE);
 512 #endif
 513           the_insn.exp = *operand;
 514
 515           /*  the_insn.reloc_offset = 1;  */
 516           the_insn.pcrel = 1; /* Assume PC-relative jump.  */
 517
 518           /* FIXME-SOON, Do we figure out whether abs later, after
 519              know sym val?  */
 520           if (reloc == BFD_RELOC_LO16 || reloc == BFD_RELOC_HI16)
 521             the_insn.pcrel = 0;
 522
 523           encode (insn, &opcode, operand->X_add_number, *args);
 524           continue;
 525         }
 526
 527       /* Types or values of args don't match.  */
 528       as_bad (_("invalid operands"));
 529       return;
 530     }
 531 }
 532
 533 char *
 534 md_atof (int type, char * litP, int *  sizeP)
 535 {
 536   return ieee_md_atof (type, litP, sizeP, TRUE);
 537 }
 538
 539 /* Write out big-endian.  */
 540
 541 void
 542 md_number_to_chars (char *buf, valueT val, int n)
 543 {
 544   number_to_chars_bigendian (buf, val, n);
 545 }
 546
 547 void
 548 md_apply_fix (fixS * fixP, valueT * val, segT seg ATTRIBUTE_UNUSED)
 549 {
 550   char *buf = fixP->fx_where + fixP->fx_frag->fr_literal;
 551   long t_val;
 552
 553   t_val = (long) *val;
 554
 555 #if DEBUG
 556   printf ("md_apply_fix val:%x\n", t_val);
 557 #endif
 558
 559   fixP->fx_addnumber = t_val; /* Remember value for emit_reloc.  */
 560
 561   switch (fixP->fx_r_type)
 562     {
 563     case BFD_RELOC_32:      /* XXXXXXXX pattern in a word.  */
 564 #if DEBUG
 565       printf ("reloc_const: val=%x\n", t_val);
 566 #endif
 567       buf[0] = t_val >> 24;
 568       buf[1] = t_val >> 16;
 569       buf[2] = t_val >> 8;
 570       buf[3] = t_val;
 571       break;
 572
 573     case BFD_RELOC_16:      /* XXXX0000 pattern in a word.  */
 574 #if DEBUG
 575       printf ("reloc_const: val=%x\n", t_val);
 576 #endif
 577       buf[0] = t_val >> 8;
 578       buf[1] = t_val;
 579       break;
 580
 581     case BFD_RELOC_8:      /* XX000000 pattern in a word.  */
 582 #if DEBUG
 583       printf ("reloc_const: val=%x\n", t_val);
 584 #endif
 585       buf[0] = t_val;
 586       break;
 587
 588     case BFD_RELOC_LO16:      /* 0000XXXX pattern in a word.  */
 589 #if DEBUG
 590       printf ("reloc_const: val=%x\n", t_val);
 591 #endif
 592       buf[2] = t_val >> 8;  /* Holds bits 0000XXXX.  */
 593       buf[3] = t_val;
 594       break;
 595
 596     case BFD_RELOC_HI16:    /* 0000XXXX pattern in a word.  */
 597 #if DEBUG
 598       printf ("reloc_consth: val=%x\n", t_val);
 599 #endif
 600       buf[2] = t_val >> 24; /* Holds bits XXXX0000.  */
 601       buf[3] = t_val >> 16;
 602       break;
 603
 604     case BFD_RELOC_32_GOT_PCREL:  /* 0000XXXX pattern in a word.  */
 605       if (!fixP->fx_done)
 606         ;
 607       else if (fixP->fx_pcrel)
 608         {
 609           long v = t_val >> 28;
 610
 611           if (v != 0 && v != -1)
 612             as_bad_where (fixP->fx_file, fixP->fx_line,
 613                           _("call/jmp target out of range (2)"));
 614         }
 615       else
 616         /* This case was supposed to be handled in machine_ip.  */
 617         abort ();
 618
 619       buf[0] |= (t_val >> 26) & 0x03; /* Holds bits 0FFFFFFC of address.  */
 620       buf[1] = t_val >> 18;
 621       buf[2] = t_val >> 10;
 622       buf[3] = t_val >> 2;
 623       break;
 624
 625     case BFD_RELOC_VTABLE_INHERIT:
 626     case BFD_RELOC_VTABLE_ENTRY:
 627       fixP->fx_done = 0;
 628       break;
 629
 630     case BFD_RELOC_NONE:
 631     default:
 632       as_bad (_("bad relocation type: 0x%02x"), fixP->fx_r_type);
 633       break;
 634     }
 635
 636   if (fixP->fx_addsy == (symbolS *) NULL)
 637     fixP->fx_done = 1;
 638 }
 639
 640 /* Should never be called for or32.  */
 641
 642 void
 643 md_create_short_jump (char *    ptr       ATTRIBUTE_UNUSED,
 644                       addressT  from_addr ATTRIBUTE_UNUSED,
 645                       addressT  to_addr   ATTRIBUTE_UNUSED,
 646                       fragS *   frag      ATTRIBUTE_UNUSED,
 647                       symbolS * to_symbol ATTRIBUTE_UNUSED)
 648 {
 649   as_fatal ("or32_create_short_jmp\n");
 650 }
 651
 652 /* Should never be called for or32.  */
 653
 654 void
 655 md_convert_frag (bfd *   headers ATTRIBUTE_UNUSED,
 656                  segT    seg     ATTRIBUTE_UNUSED,
 657                  fragS * fragP   ATTRIBUTE_UNUSED)
 658 {
 659   as_fatal ("or32_convert_frag\n");
 660 }
 661
 662 /* Should never be called for or32.  */
 663
 664 void
 665 md_create_long_jump (char *    ptr       ATTRIBUTE_UNUSED,
 666                      addressT  from_addr ATTRIBUTE_UNUSED,
 667                      addressT  to_addr   ATTRIBUTE_UNUSED,
 668                      fragS *   frag      ATTRIBUTE_UNUSED,
 669                      symbolS * to_symbol ATTRIBUTE_UNUSED)
 670 {
 671   as_fatal ("or32_create_long_jump\n");
 672 }
 673
 674 /* Should never be called for or32.  */
 675
 676 int
 677 md_estimate_size_before_relax (fragS * fragP   ATTRIBUTE_UNUSED,
 678                                segT    segtype ATTRIBUTE_UNUSED)
 679 {
 680   as_fatal ("or32_estimate_size_before_relax\n");
 681   return 0;
 682 }
 683
 684 /* Translate internal representation of relocation info to target format.
 685
 686    On sparc/29k: first 4 bytes are normal unsigned long address, next three
 687    bytes are index, most sig. byte first.  Byte 7 is broken up with
 688    bit 7 as external, bits 6 & 5 unused, and the lower
 689    five bits as relocation type.  Next 4 bytes are long addend.  */
 690 /* Thanx and a tip of the hat to Michael Bloom, mb@ttidca.tti.com.  */
 691
 692 #ifdef OBJ_AOUT
 693 void
 694 tc_aout_fix_to_chars (char *where,
 695                       fixS *fixP,
 696                       relax_addressT segment_address_in_file)
 697 {
 698   long r_symbolnum;
 699
 700 #if DEBUG
 701   printf ("tc_aout_fix_to_chars\n");
 702 #endif
 703
 704   know (fixP->fx_r_type < BFD_RELOC_NONE);
 705   know (fixP->fx_addsy != NULL);
 706
 707   md_number_to_chars
 708     (where,
 709      fixP->fx_frag->fr_address + fixP->fx_where - segment_address_in_file,
 710      4);
 711
 712   r_symbolnum = (S_IS_DEFINED (fixP->fx_addsy)
 713      ? S_GET_TYPE (fixP->fx_addsy)
 714      : fixP->fx_addsy->sy_number);
 715
 716   where[4] = (r_symbolnum >> 16) & 0x0ff;
 717   where[5] = (r_symbolnum >> 8) & 0x0ff;
 718   where[6] = r_symbolnum & 0x0ff;
 719   where[7] = (((!S_IS_DEFINED (fixP->fx_addsy)) << 7) & 0x80) | (0 & 0x60) | (fixP->fx_r_type & 0x1F);
 720
 721   /* Also easy.  */
 722   md_number_to_chars (&where[8], fixP->fx_addnumber, 4);
 723 }
 724
 725 #endif /* OBJ_AOUT */
 726 \f
 727 const char *md_shortopts = "";
 728
 729 struct option md_longopts[] =
 730 {
 731   { NULL, no_argument, NULL, 0 }
 732 };
 733 size_t md_longopts_size = sizeof (md_longopts);
 734
 735 int
 736 md_parse_option (int c ATTRIBUTE_UNUSED, char * arg ATTRIBUTE_UNUSED)
 737 {
 738   return 0;
 739 }
 740
 741 void
 742 md_show_usage (FILE * stream ATTRIBUTE_UNUSED)
 743 {
 744 }
 745 \f
 746 /* This is called when a line is unrecognized.  This is used to handle
 747    definitions of or32 style local labels.  */
 748
 749 int
 750 or32_unrecognized_line (int c)
 751 {
 752   int lab;
 753   char *s;
 754
 755   if (c != '$'
 756       || ! ISDIGIT ((unsigned char) input_line_pointer[0]))
 757     return 0;
 758
 759   s = input_line_pointer;
 760
 761   lab = 0;
 762   while (ISDIGIT ((unsigned char) *s))
 763     {
 764       lab = lab * 10 + *s - '0';
 765       ++s;
 766     }
 767
 768   if (*s != ':')
 769     /* Not a label definition.  */
 770     return 0;
 771
 772   if (dollar_label_defined (lab))
 773     {
 774       as_bad (_("label \"$%d\" redefined"), lab);
 775       return 0;
 776     }
 777
 778   define_dollar_label (lab);
 779   colon (dollar_label_name (lab, 0));
 780   input_line_pointer = s + 1;
 781
 782   return 1;
 783 }
 784
 785 /* Default the values of symbols known that should be "predefined".  We
 786    don't bother to predefine them unless you actually use one, since there
 787    are a lot of them.  */
 788
 789 symbolS *
 790 md_undefined_symbol (char *name ATTRIBUTE_UNUSED)
 791 {
 792   return NULL;
 793 }
 794
 795 /* Parse an operand that is machine-specific.  */
 796
 797 void
 798 md_operand (expressionS *expressionP)
 799 {
 800 #if DEBUG
 801   printf ("  md_operand(input_line_pointer = %s)\n", input_line_pointer);
 802 #endif
 803
 804   if (input_line_pointer[0] == REGISTER_PREFIX && input_line_pointer[1] == 'r')
 805     {
 806       /* We have a numeric register expression.  No biggy.  */
 807       input_line_pointer += 2;  /* Skip %r */
 808       (void) expression (expressionP);
 809
 810       if (expressionP->X_op != O_constant
 811           || expressionP->X_add_number > 255)
 812         as_bad (_("Invalid expression after %%%%\n"));
 813       expressionP->X_op = O_register;
 814     }
 815   else if (input_line_pointer[0] == '&')
 816     {
 817       /* We are taking the 'address' of a register...this one is not
 818          in the manual, but it *is* in traps/fpsymbol.h!  What they
 819          seem to want is the register number, as an absolute number.  */
 820       input_line_pointer++; /* Skip & */
 821       (void) expression (expressionP);
 822
 823       if (expressionP->X_op != O_register)
 824         as_bad (_("invalid register in & expression"));
 825       else
 826         expressionP->X_op = O_constant;
 827     }
 828   else if (input_line_pointer[0] == '$'
 829            && ISDIGIT ((unsigned char) input_line_pointer[1]))
 830     {
 831       long lab;
 832       char *name;
 833       symbolS *sym;
 834
 835       /* This is a local label.  */
 836       ++input_line_pointer;
 837       lab = (long) get_absolute_expression ();
 838
 839       if (dollar_label_defined (lab))
 840         {
 841           name = dollar_label_name (lab, 0);
 842           sym = symbol_find (name);
 843         }
 844       else
 845         {
 846           name = dollar_label_name (lab, 1);
 847           sym = symbol_find_or_make (name);
 848         }
 849
 850       expressionP->X_op = O_symbol;
 851       expressionP->X_add_symbol = sym;
 852       expressionP->X_add_number = 0;
 853     }
 854   else if (input_line_pointer[0] == '$')
 855     {
 856       char *s;
 857       char type;
 858       int fieldnum, fieldlimit;
 859       LITTLENUM_TYPE floatbuf[8];
 860
 861       /* $float(), $doubleN(), or $extendN() convert floating values
 862          to integers.  */
 863       s = input_line_pointer;
 864
 865       ++s;
 866
 867       fieldnum = 0;
 868       if (strncmp (s, "double", sizeof "double" - 1) == 0)
 869         {
 870           s += sizeof "double" - 1;
 871           type = 'd';
 872           fieldlimit = 2;
 873         }
 874       else if (strncmp (s, "float", sizeof "float" - 1) == 0)
 875         {
 876           s += sizeof "float" - 1;
 877           type = 'f';
 878           fieldlimit = 1;
 879         }
 880       else if (strncmp (s, "extend", sizeof "extend" - 1) == 0)
 881         {
 882           s += sizeof "extend" - 1;
 883           type = 'x';
 884           fieldlimit = 4;
 885         }
 886       else
 887         return;
 888
 889       if (ISDIGIT (*s))
 890         {
 891           fieldnum = *s - '0';
 892           ++s;
 893         }
 894       if (fieldnum >= fieldlimit)
 895         return;
 896
 897       SKIP_WHITESPACE ();
 898       if (*s != '(')
 899         return;
 900       ++s;
 901       SKIP_WHITESPACE ();
 902
 903       s = atof_ieee (s, type, floatbuf);
 904       if (s == NULL)
 905         return;
 906       s = s;
 907
 908       SKIP_WHITESPACE ();
 909       if (*s != ')')
 910         return;
 911       ++s;
 912       SKIP_WHITESPACE ();
 913
 914       input_line_pointer = s;
 915       expressionP->X_op = O_constant;
 916       expressionP->X_unsigned = 1;
 917       expressionP->X_add_number = ((floatbuf[fieldnum * 2]
 918                                     << LITTLENUM_NUMBER_OF_BITS)
 919                                    + floatbuf[fieldnum * 2 + 1]);
 920     }
 921 }
 922
 923 /* Round up a section size to the appropriate boundary.  */
 924
 925 valueT
 926 md_section_align (segT segment ATTRIBUTE_UNUSED, valueT size ATTRIBUTE_UNUSED)
 927 {
 928   return size;      /* Byte alignment is fine.  */
 929 }
 930
 931 /* Exactly what point is a PC-relative offset relative TO?
 932    On the 29000, they're relative to the address of the instruction,
 933    which we have set up as the address of the fixup too.  */
 934
 935 long
 936 md_pcrel_from (fixS *fixP)
 937 {
 938   return fixP->fx_where + fixP->fx_frag->fr_address;
 939 }
 940
 941 /* Generate a reloc for a fixup.  */
 942
 943 arelent *
 944 tc_gen_reloc (asection *seg ATTRIBUTE_UNUSED, fixS *fixp)
 945 {
 946   arelent *reloc;
 947
 948   reloc = xmalloc (sizeof (arelent));
 949   reloc->sym_ptr_ptr = xmalloc (sizeof (asymbol *));
 950   *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
 951   reloc->address = fixp->fx_frag->fr_address + fixp->fx_where;
 952   /*  reloc->address = fixp->fx_frag->fr_address + fixp->fx_where + fixp->fx_addnumber;*/
 953   reloc->howto = bfd_reloc_type_lookup (stdoutput, fixp->fx_r_type);
 954
 955   if (reloc->howto == (reloc_howto_type *) NULL)
 956     {
 957       as_bad_where (fixp->fx_file, fixp->fx_line,
 958                     _("reloc %d not supported by object file format"),
 959                     (int) fixp->fx_r_type);
 960       return NULL;
 961     }
 962
 963   if (fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
 964     reloc->address = fixp->fx_offset;
 965
 966   reloc->addend = fixp->fx_addnumber;
 967   return reloc;
 968 }