gas/config/tc-or32.c

   1 /* Assembly backend for the OpenRISC 1000.
   2    Copyright (C) 2002, 2003, 2005 Free Software Foundation, Inc.
   3    Contributed by Damjan Lampret <lampret@opencores.org>.
   4    Modified bu Johan Rydberg, <johan.rydberg@netinsight.se>.
   5    Based upon a29k port.
   6
   7    This file is part of GAS, the GNU Assembler.
   8
   9    GAS is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2, or (at your option)
  12    any later version.
  13
  14    GAS is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with GAS; see the file COPYING.  If not, write to
  21    the Free Software Foundation, 51 Franklin Street - Fifth Floor,
  22    Boston, MA 02110-1301, USA.  */
  23
  24 /* tc-a29k.c used as a template.  */
  25
  26 #include "safe-ctype.h"
  27 #include "as.h"
  28 #include "opcode/or32.h"
  29 #include "elf/or32.h"
  30
  31 #define DEBUG 0
  32
  33 #ifndef REGISTER_PREFIX
  34 #define REGISTER_PREFIX   '%'
  35 #endif
  36
  37 /* Make it easier to clone this machine desc into another one.  */
  38 #define machine_opcode  or32_opcode
  39 #define machine_opcodes or32_opcodes
  40 #define machine_ip      or32_ip
  41 #define machine_it      or32_it
  42
  43 /* Handle of the OPCODE hash table.  */
  44 static struct hash_control *op_hash = NULL;
  45
  46 struct machine_it
  47 {
  48   char *          error;
  49   unsigned long   opcode;
  50   struct nlist *  nlistp;
  51   expressionS     exp;
  52   int             pcrel;
  53   int             reloc_offset;   /* Offset of reloc within insn.  */
  54   int             reloc;
  55 }
  56 the_insn;
  57
  58 const pseudo_typeS md_pseudo_table[] =
  59 {
  60   {"align",   s_align_bytes,  4 },
  61   {"space",   s_space,        0 },
  62   {"cputype", s_ignore,       0 },
  63   {"reg",     s_lsym,         0 },  /* Register equate, same as equ.  */
  64   {"sect",    s_ignore,       0 },  /* Creation of coff sections.  */
  65   {"proc",    s_ignore,       0 },  /* Start of a function.  */
  66   {"endproc", s_ignore,       0 },  /* Function end.  */
  67   {"word",    cons,           4 },
  68   {NULL,      0,              0 },
  69 };
  70
  71 int md_short_jump_size  = 4;
  72 int md_long_jump_size   = 4;
  73
  74 /* This array holds the chars that always start a comment.
  75    If the pre-processor is disabled, these aren't very useful.  */
  76 const char comment_chars[] = "#";
  77
  78 /* This array holds the chars that only start a comment at the beginning of
  79    a line.  If the line seems to have the form '# 123 filename'
  80    .line and .file directives will appear in the pre-processed output.  */
  81 /* Note that input_file.c hand checks for '#' at the beginning of the
  82    first line of the input file.  This is because the compiler outputs
  83    #NO_APP at the beginning of its output.  */
  84 /* Also note that comments like this one will always work.  */
  85 const char line_comment_chars[] = "#";
  86
  87 /* We needed an unused char for line separation to work around the
  88    lack of macros, using sed and such.  */
  89 const char line_separator_chars[] = ";";
  90
  91 /* Chars that can be used to separate mant from exp in floating point nums.  */
  92 const char EXP_CHARS[] = "eE";
  93
  94 /* Chars that mean this number is a floating point constant.
  95    As in 0f12.456
  96    or    0d1.2345e12.  */
  97 const char FLT_CHARS[] = "rRsSfFdDxXpP";
  98
  99 /* "l.jalr r9" precalculated opcode.  */
 100 static unsigned long jalr_r9_opcode;
 101
 102 static void machine_ip (char *);
 103
 104
 105 /* Set bits in machine opcode according to insn->encoding
 106    description and passed operand.  */
 107
 108 static void
 109 encode (const struct machine_opcode *insn,
 110         unsigned long *opcode,
 111         signed long param_val,
 112         char param_ch)
 113 {
 114   int opc_pos = 0;
 115   int param_pos = 0;
 116   char *enc;
 117
 118 #if DEBUG
 119   printf ("    encode:  opcode=%.8lx  param_val=%.8lx abs=%.8lx param_ch=%c\n",
 120           *opcode, param_val, abs (param_val), param_ch);
 121 #endif
 122   for (enc = insn->encoding; *enc != '\0'; enc++)
 123     if (*enc == param_ch)
 124       {
 125         if (enc - 2 >= insn->encoding && (*(enc - 2) == '0') && (*(enc - 1) == 'x'))
 126           continue;
 127         else
 128           param_pos ++;
 129       }
 130
 131   opc_pos = 32;
 132
 133   for (enc = insn->encoding; *enc != '\0';)
 134     {
 135       if ((*enc == '0') && (*(enc + 1) == 'x'))
 136         {
 137           int tmp = strtol (enc, NULL, 16);
 138
 139           opc_pos -= 4;
 140           *opcode |= tmp << opc_pos;
 141           enc += 3;
 142         }
 143       else if ((*enc == '0') || (*enc == '-'))
 144         {
 145           opc_pos--;
 146           enc++;
 147         }
 148       else if (*enc == '1')
 149         {
 150           opc_pos--;
 151           *opcode |= 1 << opc_pos;
 152           enc++;
 153         }
 154       else if (*enc == param_ch)
 155         {
 156           opc_pos--;
 157           param_pos--;
 158           *opcode |= ((param_val >> param_pos) & 0x1) << opc_pos;
 159           enc++;
 160         }
 161       else if (ISALPHA (*enc))
 162         {
 163           opc_pos--;
 164           enc++;
 165         }
 166       else
 167         enc++;
 168     }
 169
 170 #if DEBUG
 171   printf ("    opcode=%.8lx\n", *opcode);
 172 #endif
 173 }
 174
 175 /* This function is called once, at assembler startup time.  It should
 176    set up all the tables, etc., that the MD part of the assembler will
 177    need.  */
 178
 179 void
 180 md_begin (void)
 181 {
 182   const char *retval = NULL;
 183   int lose = 0;
 184   int skipnext = 0;
 185   unsigned int i;
 186
 187   /* Hash up all the opcodes for fast use later.  */
 188   op_hash = hash_new ();
 189
 190   for (i = 0; i < or32_num_opcodes; i++)
 191     {
 192       const char *name = machine_opcodes[i].name;
 193
 194       if (skipnext)
 195         {
 196           skipnext = 0;
 197           continue;
 198         }
 199
 200       retval = hash_insert (op_hash, name, (void *) &machine_opcodes[i]);
 201       if (retval != NULL)
 202         {
 203           fprintf (stderr, "internal error: can't hash `%s': %s\n",
 204                    machine_opcodes[i].name, retval);
 205           lose = 1;
 206         }
 207     }
 208
 209   if (lose)
 210     as_fatal (_("Broken assembler.  No assembly attempted."));
 211
 212   encode (&machine_opcodes[insn_index ("l.jalr")], &jalr_r9_opcode, 9, 'B');
 213 }
 214
 215 /* Returns non zero if instruction is to be used.  */
 216
 217 static int
 218 check_invalid_opcode (unsigned long opcode)
 219 {
 220   return opcode == jalr_r9_opcode;
 221 }
 222
 223 /* Assemble a single instruction.  Its label has already been handled
 224    by the generic front end.  We just parse opcode and operands, and
 225    produce the bytes of data and relocation.  */
 226
 227 void
 228 md_assemble (char *str)
 229 {
 230   char *toP;
 231
 232 #if DEBUG
 233   printf ("NEW INSTRUCTION\n");
 234 #endif
 235
 236   know (str);
 237   machine_ip (str);
 238   toP = frag_more (4);
 239
 240   /* Put out the opcode.  */
 241   md_number_to_chars (toP, the_insn.opcode, 4);
 242
 243   /* Put out the symbol-dependent stuff.  */
 244   if (the_insn.reloc != BFD_RELOC_NONE)
 245     {
 246       fix_new_exp (frag_now,
 247                    (toP - frag_now->fr_literal + the_insn.reloc_offset),
 248                    4,   /* size */
 249                    &the_insn.exp,
 250                    the_insn.pcrel,
 251                    the_insn.reloc);
 252     }
 253 }
 254
 255 /* This is true of the we have issued a "lo(" or "hi"(.  */
 256 static int waiting_for_shift = 0;
 257
 258 static int mask_or_shift = 0;
 259
 260 static char *
 261 parse_operand (char *s, expressionS *operandp, int opt)
 262 {
 263   char *save = input_line_pointer;
 264   char *new;
 265
 266 #if DEBUG
 267   printf ("  PROCESS NEW OPERAND(%s) == %c (%d)\n", s, opt ? opt : '!', opt);
 268 #endif
 269
 270   input_line_pointer = s;
 271
 272   if (strncasecmp (s, "HI(", 3) == 0)
 273     {
 274       waiting_for_shift = 1;
 275       mask_or_shift = BFD_RELOC_HI16;
 276
 277       input_line_pointer += 3;
 278     }
 279   else if (strncasecmp (s, "LO(", 3) == 0)
 280     {
 281       mask_or_shift = BFD_RELOC_LO16;
 282
 283       input_line_pointer += 3;
 284     }
 285   else
 286     mask_or_shift = 0;
 287
 288   if ((*s == '(') && (*(s+1) == 'r'))
 289     s++;
 290
 291   if ((*s == 'r') && ISDIGIT (*(s + 1)))
 292     {
 293       operandp->X_add_number = strtol (s + 1, NULL, 10);
 294       operandp->X_op = O_register;
 295       for (; (*s != ',') && (*s != '\0');)
 296         s++;
 297       input_line_pointer = save;
 298       return s;
 299     }
 300
 301   expression (operandp);
 302
 303   if (operandp->X_op == O_absent)
 304     {
 305       if (! opt)
 306         as_bad (_("missing operand"));
 307       else
 308         {
 309           operandp->X_add_number = 0;
 310           operandp->X_op = O_constant;
 311         }
 312     }
 313
 314   new = input_line_pointer;
 315   input_line_pointer = save;
 316
 317 #if DEBUG
 318   printf ("  %s=parse_operand(%s): operandp->X_op = %u\n", new, s, operandp->X_op);
 319 #endif
 320
 321   return new;
 322 }
 323
 324 /* Instruction parsing.  Takes a string containing the opcode.
 325    Operands are at input_line_pointer.  Output is in the_insn.
 326    Warnings or errors are generated.  */
 327
 328 static void
 329 machine_ip (char *str)
 330 {
 331   char *s;
 332   const char *args;
 333   const struct machine_opcode *insn;
 334   char *argsStart;
 335   unsigned long opcode;
 336   expressionS the_operand;
 337   expressionS *operand = &the_operand;
 338   unsigned int regno;
 339   int reloc = BFD_RELOC_NONE;
 340
 341 #if DEBUG
 342   printf ("machine_ip(%s)\n", str);
 343 #endif
 344
 345   s = str;
 346   for (; ISALNUM (*s) || *s == '.'; ++s)
 347     if (ISUPPER (*s))
 348       *s = TOLOWER (*s);
 349
 350   switch (*s)
 351     {
 352     case '\0':
 353       break;
 354
 355     case ' ':     /* FIXME-SOMEDAY more whitespace.  */
 356       *s++ = '\0';
 357       break;
 358
 359     default:
 360       as_bad (_("unknown opcode1: `%s'"), str);
 361       return;
 362     }
 363
 364   if ((insn = (struct machine_opcode *) hash_find (op_hash, str)) == NULL)
 365     {
 366       as_bad (_("unknown opcode2 `%s'."), str);
 367       return;
 368     }
 369
 370   argsStart = s;
 371   opcode = 0;
 372   memset (&the_insn, '\0', sizeof (the_insn));
 373   the_insn.reloc = BFD_RELOC_NONE;
 374
 375   reloc = BFD_RELOC_NONE;
 376
 377   /* Build the opcode, checking as we go to make sure that the
 378      operands match.
 379
 380      If an operand matches, we modify the_insn or opcode appropriately,
 381      and do a "continue".  If an operand fails to match, we "break".  */
 382   if (insn->args[0] != '\0')
 383     /* Prime the pump.  */
 384     s = parse_operand (s, operand, insn->args[0] == 'I');
 385
 386   for (args = insn->args;; ++args)
 387     {
 388 #if DEBUG
 389       printf ("  args = %s\n", args);
 390 #endif
 391       switch (*args)
 392         {
 393         case '\0':    /* End of args.  */
 394           /* We have have 0 args, do the bazoooka!  */
 395           if (args == insn->args)
 396             encode (insn, &opcode, 0, 0);
 397
 398           if (*s == '\0')
 399             {
 400               /* We are truly done.  */
 401               the_insn.opcode = opcode;
 402               if (check_invalid_opcode (opcode))
 403                 as_bad (_("instruction not allowed: %s"), str);
 404               return;
 405             }
 406           as_bad (_("too many operands: %s"), s);
 407           break;
 408
 409         case ',':   /* Must match a comma.  */
 410           if (*s++ == ',')
 411             {
 412               reloc = BFD_RELOC_NONE;
 413
 414               /* Parse next operand.  */
 415               s = parse_operand (s, operand, args[1] == 'I');
 416 #if DEBUG
 417               printf ("    ',' case: operand->X_add_number = %d, *args = %s, *s = %s\n",
 418                       operand->X_add_number, args, s);
 419 #endif
 420               continue;
 421             }
 422           break;
 423
 424         case '(':   /* Must match a (.  */
 425           s = parse_operand (s, operand, args[1] == 'I');
 426           continue;
 427
 428         case ')':   /* Must match a ).  */
 429           continue;
 430
 431         case 'r':   /* A general register.  */
 432           args++;
 433
 434           if (operand->X_op != O_register)
 435             break;    /* Only registers.  */
 436
 437           know (operand->X_add_symbol == 0);
 438           know (operand->X_op_symbol == 0);
 439           regno = operand->X_add_number;
 440           encode (insn, &opcode, regno, *args);
 441 #if DEBUG
 442           printf ("    r: operand->X_op = %d\n", operand->X_op);
 443 #endif
 444           continue;
 445
 446         default:
 447           /* if (! ISALPHA (*args))
 448                break;  */   /* Only immediate values.  */
 449
 450           if (mask_or_shift)
 451             {
 452 #if DEBUG
 453               printf ("mask_or_shift = %d\n", mask_or_shift);
 454 #endif
 455               reloc = mask_or_shift;
 456             }
 457           mask_or_shift = 0;
 458
 459           if (strncasecmp (args, "LO(", 3) == 0)
 460             {
 461 #if DEBUG
 462               printf ("reloc_const\n");
 463 #endif
 464               reloc = BFD_RELOC_LO16;
 465             }
 466           else if (strncasecmp (args, "HI(", 3) == 0)
 467             {
 468 #if DEBUG
 469               printf ("reloc_consth\n");
 470 #endif
 471               reloc = BFD_RELOC_HI16;
 472             }
 473
 474           if (*s == '(')
 475             operand->X_op = O_constant;
 476           else if (*s == ')')
 477             s += 1;
 478 #if DEBUG
 479           printf ("    default case: operand->X_add_number = %d, *args = %s, *s = %s\n", operand->X_add_number, args, s);
 480 #endif
 481           if (operand->X_op == O_constant)
 482             {
 483               if (reloc == BFD_RELOC_NONE)
 484                 {
 485                   bfd_vma v, mask;
 486
 487                   mask = 0x3ffffff;
 488                   v = abs (operand->X_add_number) & ~ mask;
 489                   if (v)
 490                     as_bad (_("call/jmp target out of range (1)"));
 491                 }
 492
 493               if (reloc == BFD_RELOC_HI16)
 494                 operand->X_add_number = ((operand->X_add_number >> 16) & 0xffff);
 495
 496               the_insn.pcrel = 0;
 497               encode (insn, &opcode, operand->X_add_number, *args);
 498  /*             the_insn.reloc = BFD_RELOC_NONE; */
 499               continue;
 500             }
 501
 502           if (reloc == BFD_RELOC_NONE)
 503             the_insn.reloc = BFD_RELOC_32_GOT_PCREL;
 504           else
 505             the_insn.reloc = reloc;
 506
 507           /* the_insn.reloc = insn->reloc;  */
 508 #if DEBUG
 509           printf ("    reloc sym=%d\n", the_insn.reloc);
 510           printf ("    BFD_RELOC_NONE=%d\n", BFD_RELOC_NONE);
 511 #endif
 512           the_insn.exp = *operand;
 513
 514           /*  the_insn.reloc_offset = 1;  */
 515           the_insn.pcrel = 1; /* Assume PC-relative jump.  */
 516
 517           /* FIXME-SOON, Do we figure out whether abs later, after
 518              know sym val?  */
 519           if (reloc == BFD_RELOC_LO16 || reloc == BFD_RELOC_HI16)
 520             the_insn.pcrel = 0;
 521
 522           encode (insn, &opcode, operand->X_add_number, *args);
 523           continue;
 524         }
 525
 526       /* Types or values of args don't match.  */
 527       as_bad (_("invalid operands"));
 528       return;
 529     }
 530 }
 531
 532 /* This is identical to the md_atof in m68k.c.  I think this is right,
 533    but I'm not sure.
 534
 535    Turn a string in input_line_pointer into a floating point constant
 536    of type type, and store the appropriate bytes in *litP.  The number
 537    of LITTLENUMS emitted is stored in *sizeP .  An error message is
 538    returned, or NULL on OK.  */
 539
 540 /* Equal to MAX_PRECISION in atof-ieee.c.  */
 541 #define MAX_LITTLENUMS 6
 542
 543 char *
 544 md_atof (int type, char * litP, int *  sizeP)
 545 {
 546   int prec;
 547   LITTLENUM_TYPE words[MAX_LITTLENUMS];
 548   LITTLENUM_TYPE *wordP;
 549   char *t;
 550
 551   switch (type)
 552     {
 553     case 'f':
 554     case 'F':
 555     case 's':
 556     case 'S':
 557       prec = 2;
 558       break;
 559
 560     case 'd':
 561     case 'D':
 562     case 'r':
 563     case 'R':
 564       prec = 4;
 565       break;
 566
 567     case 'x':
 568     case 'X':
 569       prec = 6;
 570       break;
 571
 572     case 'p':
 573     case 'P':
 574       prec = 6;
 575       break;
 576
 577     default:
 578       *sizeP = 0;
 579       return _("Bad call to MD_ATOF()");
 580     }
 581
 582   t = atof_ieee (input_line_pointer, type, words);
 583   if (t)
 584     input_line_pointer = t;
 585
 586   *sizeP = prec * sizeof (LITTLENUM_TYPE);
 587
 588   for (wordP = words; prec--;)
 589     {
 590       md_number_to_chars (litP, (valueT) (*wordP++), sizeof (LITTLENUM_TYPE));
 591       litP += sizeof (LITTLENUM_TYPE);
 592     }
 593
 594   return NULL;
 595 }
 596
 597 /* Write out big-endian.  */
 598
 599 void
 600 md_number_to_chars (char *buf, valueT val, int n)
 601 {
 602   number_to_chars_bigendian (buf, val, n);
 603 }
 604
 605 void
 606 md_apply_fix (fixS * fixP, valueT * val, segT seg ATTRIBUTE_UNUSED)
 607 {
 608   char *buf = fixP->fx_where + fixP->fx_frag->fr_literal;
 609   long t_val;
 610
 611   t_val = (long) *val;
 612
 613 #if DEBUG
 614   printf ("md_apply_fix val:%x\n", t_val);
 615 #endif
 616
 617   fixP->fx_addnumber = t_val; /* Remember value for emit_reloc.  */
 618
 619   know (fixP->fx_size == 4);
 620   know (fixP->fx_r_type < BFD_RELOC_NONE);
 621
 622   switch (fixP->fx_r_type)
 623     {
 624     case BFD_RELOC_32:      /* XXXXXXXX pattern in a word.  */
 625 #if DEBUG
 626       printf ("reloc_const: val=%x\n", t_val);
 627 #endif
 628       buf[0] = t_val >> 24;
 629       buf[1] = t_val >> 16;
 630       buf[2] = t_val >> 8;
 631       buf[3] = t_val;
 632       break;
 633
 634     case BFD_RELOC_16:      /* XXXX0000 pattern in a word.  */
 635 #if DEBUG
 636       printf ("reloc_const: val=%x\n", t_val);
 637 #endif
 638       buf[0] = t_val >> 8;
 639       buf[1] = t_val;
 640       break;
 641
 642     case BFD_RELOC_8:      /* XX000000 pattern in a word.  */
 643 #if DEBUG
 644       printf ("reloc_const: val=%x\n", t_val);
 645 #endif
 646       buf[0] = t_val;
 647       break;
 648
 649     case BFD_RELOC_LO16:      /* 0000XXXX pattern in a word.  */
 650 #if DEBUG
 651       printf ("reloc_const: val=%x\n", t_val);
 652 #endif
 653       buf[2] = t_val >> 8;  /* Holds bits 0000XXXX.  */
 654       buf[3] = t_val;
 655       break;
 656
 657     case BFD_RELOC_HI16:    /* 0000XXXX pattern in a word.  */
 658 #if DEBUG
 659       printf ("reloc_consth: val=%x\n", t_val);
 660 #endif
 661       buf[2] = t_val >> 24; /* Holds bits XXXX0000.  */
 662       buf[3] = t_val >> 16;
 663       break;
 664
 665     case BFD_RELOC_32_GOT_PCREL:  /* 0000XXXX pattern in a word.  */
 666       if (!fixP->fx_done)
 667         ;
 668       else if (fixP->fx_pcrel)
 669         {
 670           long v = t_val >> 28;
 671
 672           if (v != 0 && v != -1)
 673             as_bad_where (fixP->fx_file, fixP->fx_line,
 674                           _("call/jmp target out of range (2)"));
 675         }
 676       else
 677         /* This case was supposed to be handled in machine_ip.  */
 678         abort ();
 679
 680       buf[0] |= (t_val >> 26) & 0x03; /* Holds bits 0FFFFFFC of address.  */
 681       buf[1] = t_val >> 18;
 682       buf[2] = t_val >> 10;
 683       buf[3] = t_val >> 2;
 684       break;
 685
 686     case BFD_RELOC_VTABLE_INHERIT:
 687     case BFD_RELOC_VTABLE_ENTRY:
 688       fixP->fx_done = 0;
 689       break;
 690
 691     case BFD_RELOC_NONE:
 692     default:
 693       as_bad (_("bad relocation type: 0x%02x"), fixP->fx_r_type);
 694       break;
 695     }
 696
 697   if (fixP->fx_addsy == (symbolS *) NULL)
 698     fixP->fx_done = 1;
 699 }
 700
 701 /* Should never be called for or32.  */
 702
 703 void
 704 md_create_short_jump (char *    ptr       ATTRIBUTE_UNUSED,
 705                       addressT  from_addr ATTRIBUTE_UNUSED,
 706                       addressT  to_addr   ATTRIBUTE_UNUSED,
 707                       fragS *   frag      ATTRIBUTE_UNUSED,
 708                       symbolS * to_symbol ATTRIBUTE_UNUSED)
 709 {
 710   as_fatal ("or32_create_short_jmp\n");
 711 }
 712
 713 /* Should never be called for or32.  */
 714
 715 void
 716 md_convert_frag (bfd *   headers ATTRIBUTE_UNUSED,
 717                  segT    seg     ATTRIBUTE_UNUSED,
 718                  fragS * fragP   ATTRIBUTE_UNUSED)
 719 {
 720   as_fatal ("or32_convert_frag\n");
 721 }
 722
 723 /* Should never be called for or32.  */
 724
 725 void
 726 md_create_long_jump (char *    ptr       ATTRIBUTE_UNUSED,
 727                      addressT  from_addr ATTRIBUTE_UNUSED,
 728                      addressT  to_addr   ATTRIBUTE_UNUSED,
 729                      fragS *   frag      ATTRIBUTE_UNUSED,
 730                      symbolS * to_symbol ATTRIBUTE_UNUSED)
 731 {
 732   as_fatal ("or32_create_long_jump\n");
 733 }
 734
 735 /* Should never be called for or32.  */
 736
 737 int
 738 md_estimate_size_before_relax (fragS * fragP   ATTRIBUTE_UNUSED,
 739                                segT    segtype ATTRIBUTE_UNUSED)
 740 {
 741   as_fatal ("or32_estimate_size_before_relax\n");
 742   return 0;
 743 }
 744
 745 /* Translate internal representation of relocation info to target format.
 746
 747    On sparc/29k: first 4 bytes are normal unsigned long address, next three
 748    bytes are index, most sig. byte first.  Byte 7 is broken up with
 749    bit 7 as external, bits 6 & 5 unused, and the lower
 750    five bits as relocation type.  Next 4 bytes are long addend.  */
 751 /* Thanx and a tip of the hat to Michael Bloom, mb@ttidca.tti.com.  */
 752
 753 #ifdef OBJ_AOUT
 754 void
 755 tc_aout_fix_to_chars (char *where,
 756                       fixS *fixP,
 757                       relax_addressT segment_address_in_file)
 758 {
 759   long r_symbolnum;
 760
 761 #if DEBUG
 762   printf ("tc_aout_fix_to_chars\n");
 763 #endif
 764
 765   know (fixP->fx_r_type < BFD_RELOC_NONE);
 766   know (fixP->fx_addsy != NULL);
 767
 768   md_number_to_chars
 769     (where,
 770      fixP->fx_frag->fr_address + fixP->fx_where - segment_address_in_file,
 771      4);
 772
 773   r_symbolnum = (S_IS_DEFINED (fixP->fx_addsy)
 774      ? S_GET_TYPE (fixP->fx_addsy)
 775      : fixP->fx_addsy->sy_number);
 776
 777   where[4] = (r_symbolnum >> 16) & 0x0ff;
 778   where[5] = (r_symbolnum >> 8) & 0x0ff;
 779   where[6] = r_symbolnum & 0x0ff;
 780   where[7] = (((!S_IS_DEFINED (fixP->fx_addsy)) << 7) & 0x80) | (0 & 0x60) | (fixP->fx_r_type & 0x1F);
 781
 782   /* Also easy.  */
 783   md_number_to_chars (&where[8], fixP->fx_addnumber, 4);
 784 }
 785
 786 #endif /* OBJ_AOUT */
 787 \f
 788 const char *md_shortopts = "";
 789
 790 struct option md_longopts[] =
 791 {
 792   { NULL, no_argument, NULL, 0 }
 793 };
 794 size_t md_longopts_size = sizeof (md_longopts);
 795
 796 int
 797 md_parse_option (int c ATTRIBUTE_UNUSED, char * arg ATTRIBUTE_UNUSED)
 798 {
 799   return 0;
 800 }
 801
 802 void
 803 md_show_usage (FILE * stream ATTRIBUTE_UNUSED)
 804 {
 805 }
 806 \f
 807 /* This is called when a line is unrecognized.  This is used to handle
 808    definitions of or32 style local labels.  */
 809
 810 int
 811 or32_unrecognized_line (int c)
 812 {
 813   int lab;
 814   char *s;
 815
 816   if (c != '$'
 817       || ! ISDIGIT ((unsigned char) input_line_pointer[0]))
 818     return 0;
 819
 820   s = input_line_pointer;
 821
 822   lab = 0;
 823   while (ISDIGIT ((unsigned char) *s))
 824     {
 825       lab = lab * 10 + *s - '0';
 826       ++s;
 827     }
 828
 829   if (*s != ':')
 830     /* Not a label definition.  */
 831     return 0;
 832
 833   if (dollar_label_defined (lab))
 834     {
 835       as_bad (_("label \"$%d\" redefined"), lab);
 836       return 0;
 837     }
 838
 839   define_dollar_label (lab);
 840   colon (dollar_label_name (lab, 0));
 841   input_line_pointer = s + 1;
 842
 843   return 1;
 844 }
 845
 846 /* Default the values of symbols known that should be "predefined".  We
 847    don't bother to predefine them unless you actually use one, since there
 848    are a lot of them.  */
 849
 850 symbolS *
 851 md_undefined_symbol (char *name ATTRIBUTE_UNUSED)
 852 {
 853   return NULL;
 854 }
 855
 856 /* Parse an operand that is machine-specific.  */
 857
 858 void
 859 md_operand (expressionS *expressionP)
 860 {
 861 #if DEBUG
 862   printf ("  md_operand(input_line_pointer = %s)\n", input_line_pointer);
 863 #endif
 864
 865   if (input_line_pointer[0] == REGISTER_PREFIX && input_line_pointer[1] == 'r')
 866     {
 867       /* We have a numeric register expression.  No biggy.  */
 868       input_line_pointer += 2;  /* Skip %r */
 869       (void) expression (expressionP);
 870
 871       if (expressionP->X_op != O_constant
 872           || expressionP->X_add_number > 255)
 873         as_bad (_("Invalid expression after %%%%\n"));
 874       expressionP->X_op = O_register;
 875     }
 876   else if (input_line_pointer[0] == '&')
 877     {
 878       /* We are taking the 'address' of a register...this one is not
 879          in the manual, but it *is* in traps/fpsymbol.h!  What they
 880          seem to want is the register number, as an absolute number.  */
 881       input_line_pointer++; /* Skip & */
 882       (void) expression (expressionP);
 883
 884       if (expressionP->X_op != O_register)
 885         as_bad (_("invalid register in & expression"));
 886       else
 887         expressionP->X_op = O_constant;
 888     }
 889   else if (input_line_pointer[0] == '$'
 890            && ISDIGIT ((unsigned char) input_line_pointer[1]))
 891     {
 892       long lab;
 893       char *name;
 894       symbolS *sym;
 895
 896       /* This is a local label.  */
 897       ++input_line_pointer;
 898       lab = (long) get_absolute_expression ();
 899
 900       if (dollar_label_defined (lab))
 901         {
 902           name = dollar_label_name (lab, 0);
 903           sym = symbol_find (name);
 904         }
 905       else
 906         {
 907           name = dollar_label_name (lab, 1);
 908           sym = symbol_find_or_make (name);
 909         }
 910
 911       expressionP->X_op = O_symbol;
 912       expressionP->X_add_symbol = sym;
 913       expressionP->X_add_number = 0;
 914     }
 915   else if (input_line_pointer[0] == '$')
 916     {
 917       char *s;
 918       char type;
 919       int fieldnum, fieldlimit;
 920       LITTLENUM_TYPE floatbuf[8];
 921
 922       /* $float(), $doubleN(), or $extendN() convert floating values
 923          to integers.  */
 924       s = input_line_pointer;
 925
 926       ++s;
 927
 928       fieldnum = 0;
 929       if (strncmp (s, "double", sizeof "double" - 1) == 0)
 930         {
 931           s += sizeof "double" - 1;
 932           type = 'd';
 933           fieldlimit = 2;
 934         }
 935       else if (strncmp (s, "float", sizeof "float" - 1) == 0)
 936         {
 937           s += sizeof "float" - 1;
 938           type = 'f';
 939           fieldlimit = 1;
 940         }
 941       else if (strncmp (s, "extend", sizeof "extend" - 1) == 0)
 942         {
 943           s += sizeof "extend" - 1;
 944           type = 'x';
 945           fieldlimit = 4;
 946         }
 947       else
 948         return;
 949
 950       if (ISDIGIT (*s))
 951         {
 952           fieldnum = *s - '0';
 953           ++s;
 954         }
 955       if (fieldnum >= fieldlimit)
 956         return;
 957
 958       SKIP_WHITESPACE ();
 959       if (*s != '(')
 960         return;
 961       ++s;
 962       SKIP_WHITESPACE ();
 963
 964       s = atof_ieee (s, type, floatbuf);
 965       if (s == NULL)
 966         return;
 967       s = s;
 968
 969       SKIP_WHITESPACE ();
 970       if (*s != ')')
 971         return;
 972       ++s;
 973       SKIP_WHITESPACE ();
 974
 975       input_line_pointer = s;
 976       expressionP->X_op = O_constant;
 977       expressionP->X_unsigned = 1;
 978       expressionP->X_add_number = ((floatbuf[fieldnum * 2]
 979                                     << LITTLENUM_NUMBER_OF_BITS)
 980                                    + floatbuf[fieldnum * 2 + 1]);
 981     }
 982 }
 983
 984 /* Round up a section size to the appropriate boundary.  */
 985
 986 valueT
 987 md_section_align (segT segment ATTRIBUTE_UNUSED, valueT size ATTRIBUTE_UNUSED)
 988 {
 989   return size;      /* Byte alignment is fine.  */
 990 }
 991
 992 /* Exactly what point is a PC-relative offset relative TO?
 993    On the 29000, they're relative to the address of the instruction,
 994    which we have set up as the address of the fixup too.  */
 995
 996 long
 997 md_pcrel_from (fixS *fixP)
 998 {
 999   return fixP->fx_where + fixP->fx_frag->fr_address;
1000 }
1001
1002 /* Generate a reloc for a fixup.  */
1003
1004 arelent *
1005 tc_gen_reloc (asection *seg ATTRIBUTE_UNUSED, fixS *fixp)
1006 {
1007   arelent *reloc;
1008
1009   reloc = xmalloc (sizeof (arelent));
1010   reloc->sym_ptr_ptr = xmalloc (sizeof (asymbol *));
1011   *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
1012   reloc->address = fixp->fx_frag->fr_address + fixp->fx_where;
1013   /*  reloc->address = fixp->fx_frag->fr_address + fixp->fx_where + fixp->fx_addnumber;*/
1014   reloc->howto = bfd_reloc_type_lookup (stdoutput, fixp->fx_r_type);
1015
1016   if (reloc->howto == (reloc_howto_type *) NULL)
1017     {
1018       as_bad_where (fixp->fx_file, fixp->fx_line,
1019                     _("reloc %d not supported by object file format"),
1020                     (int) fixp->fx_r_type);
1021       return NULL;
1022     }
1023
1024   if (fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
1025     reloc->address = fixp->fx_offset;
1026
1027   reloc->addend = fixp->fx_addnumber;
1028   return reloc;
1029 }