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 /* This is identical to the md_atof in m68k.c.  I think this is right,
 534    but I'm not sure.
 535
 536    Turn a string in input_line_pointer into a floating point constant
 537    of type type, and store the appropriate bytes in *litP.  The number
 538    of LITTLENUMS emitted is stored in *sizeP .  An error message is
 539    returned, or NULL on OK.  */
 540
 541 /* Equal to MAX_PRECISION in atof-ieee.c.  */
 542 #define MAX_LITTLENUMS 6
 543
 544 char *
 545 md_atof (int type, char * litP, int *  sizeP)
 546 {
 547   int prec;
 548   LITTLENUM_TYPE words[MAX_LITTLENUMS];
 549   LITTLENUM_TYPE *wordP;
 550   char *t;
 551
 552   switch (type)
 553     {
 554     case 'f':
 555     case 'F':
 556     case 's':
 557     case 'S':
 558       prec = 2;
 559       break;
 560
 561     case 'd':
 562     case 'D':
 563     case 'r':
 564     case 'R':
 565       prec = 4;
 566       break;
 567
 568     case 'x':
 569     case 'X':
 570       prec = 6;
 571       break;
 572
 573     case 'p':
 574     case 'P':
 575       prec = 6;
 576       break;
 577
 578     default:
 579       *sizeP = 0;
 580       return _("Bad call to MD_ATOF()");
 581     }
 582
 583   t = atof_ieee (input_line_pointer, type, words);
 584   if (t)
 585     input_line_pointer = t;
 586
 587   *sizeP = prec * sizeof (LITTLENUM_TYPE);
 588
 589   for (wordP = words; prec--;)
 590     {
 591       md_number_to_chars (litP, (valueT) (*wordP++), sizeof (LITTLENUM_TYPE));
 592       litP += sizeof (LITTLENUM_TYPE);
 593     }
 594
 595   return NULL;
 596 }
 597
 598 /* Write out big-endian.  */
 599
 600 void
 601 md_number_to_chars (char *buf, valueT val, int n)
 602 {
 603   number_to_chars_bigendian (buf, val, n);
 604 }
 605
 606 void
 607 md_apply_fix (fixS * fixP, valueT * val, segT seg ATTRIBUTE_UNUSED)
 608 {
 609   char *buf = fixP->fx_where + fixP->fx_frag->fr_literal;
 610   long t_val;
 611
 612   t_val = (long) *val;
 613
 614 #if DEBUG
 615   printf ("md_apply_fix val:%x\n", t_val);
 616 #endif
 617
 618   fixP->fx_addnumber = t_val; /* Remember value for emit_reloc.  */
 619
 620   switch (fixP->fx_r_type)
 621     {
 622     case BFD_RELOC_32:      /* XXXXXXXX pattern in a word.  */
 623 #if DEBUG
 624       printf ("reloc_const: val=%x\n", t_val);
 625 #endif
 626       buf[0] = t_val >> 24;
 627       buf[1] = t_val >> 16;
 628       buf[2] = t_val >> 8;
 629       buf[3] = t_val;
 630       break;
 631
 632     case BFD_RELOC_16:      /* XXXX0000 pattern in a word.  */
 633 #if DEBUG
 634       printf ("reloc_const: val=%x\n", t_val);
 635 #endif
 636       buf[0] = t_val >> 8;
 637       buf[1] = t_val;
 638       break;
 639
 640     case BFD_RELOC_8:      /* XX000000 pattern in a word.  */
 641 #if DEBUG
 642       printf ("reloc_const: val=%x\n", t_val);
 643 #endif
 644       buf[0] = t_val;
 645       break;
 646
 647     case BFD_RELOC_LO16:      /* 0000XXXX pattern in a word.  */
 648 #if DEBUG
 649       printf ("reloc_const: val=%x\n", t_val);
 650 #endif
 651       buf[2] = t_val >> 8;  /* Holds bits 0000XXXX.  */
 652       buf[3] = t_val;
 653       break;
 654
 655     case BFD_RELOC_HI16:    /* 0000XXXX pattern in a word.  */
 656 #if DEBUG
 657       printf ("reloc_consth: val=%x\n", t_val);
 658 #endif
 659       buf[2] = t_val >> 24; /* Holds bits XXXX0000.  */
 660       buf[3] = t_val >> 16;
 661       break;
 662
 663     case BFD_RELOC_32_GOT_PCREL:  /* 0000XXXX pattern in a word.  */
 664       if (!fixP->fx_done)
 665         ;
 666       else if (fixP->fx_pcrel)
 667         {
 668           long v = t_val >> 28;
 669
 670           if (v != 0 && v != -1)
 671             as_bad_where (fixP->fx_file, fixP->fx_line,
 672                           _("call/jmp target out of range (2)"));
 673         }
 674       else
 675         /* This case was supposed to be handled in machine_ip.  */
 676         abort ();
 677
 678       buf[0] |= (t_val >> 26) & 0x03; /* Holds bits 0FFFFFFC of address.  */
 679       buf[1] = t_val >> 18;
 680       buf[2] = t_val >> 10;
 681       buf[3] = t_val >> 2;
 682       break;
 683
 684     case BFD_RELOC_VTABLE_INHERIT:
 685     case BFD_RELOC_VTABLE_ENTRY:
 686       fixP->fx_done = 0;
 687       break;
 688
 689     case BFD_RELOC_NONE:
 690     default:
 691       as_bad (_("bad relocation type: 0x%02x"), fixP->fx_r_type);
 692       break;
 693     }
 694
 695   if (fixP->fx_addsy == (symbolS *) NULL)
 696     fixP->fx_done = 1;
 697 }
 698
 699 /* Should never be called for or32.  */
 700
 701 void
 702 md_create_short_jump (char *    ptr       ATTRIBUTE_UNUSED,
 703                       addressT  from_addr ATTRIBUTE_UNUSED,
 704                       addressT  to_addr   ATTRIBUTE_UNUSED,
 705                       fragS *   frag      ATTRIBUTE_UNUSED,
 706                       symbolS * to_symbol ATTRIBUTE_UNUSED)
 707 {
 708   as_fatal ("or32_create_short_jmp\n");
 709 }
 710
 711 /* Should never be called for or32.  */
 712
 713 void
 714 md_convert_frag (bfd *   headers ATTRIBUTE_UNUSED,
 715                  segT    seg     ATTRIBUTE_UNUSED,
 716                  fragS * fragP   ATTRIBUTE_UNUSED)
 717 {
 718   as_fatal ("or32_convert_frag\n");
 719 }
 720
 721 /* Should never be called for or32.  */
 722
 723 void
 724 md_create_long_jump (char *    ptr       ATTRIBUTE_UNUSED,
 725                      addressT  from_addr ATTRIBUTE_UNUSED,
 726                      addressT  to_addr   ATTRIBUTE_UNUSED,
 727                      fragS *   frag      ATTRIBUTE_UNUSED,
 728                      symbolS * to_symbol ATTRIBUTE_UNUSED)
 729 {
 730   as_fatal ("or32_create_long_jump\n");
 731 }
 732
 733 /* Should never be called for or32.  */
 734
 735 int
 736 md_estimate_size_before_relax (fragS * fragP   ATTRIBUTE_UNUSED,
 737                                segT    segtype ATTRIBUTE_UNUSED)
 738 {
 739   as_fatal ("or32_estimate_size_before_relax\n");
 740   return 0;
 741 }
 742
 743 /* Translate internal representation of relocation info to target format.
 744
 745    On sparc/29k: first 4 bytes are normal unsigned long address, next three
 746    bytes are index, most sig. byte first.  Byte 7 is broken up with
 747    bit 7 as external, bits 6 & 5 unused, and the lower
 748    five bits as relocation type.  Next 4 bytes are long addend.  */
 749 /* Thanx and a tip of the hat to Michael Bloom, mb@ttidca.tti.com.  */
 750
 751 #ifdef OBJ_AOUT
 752 void
 753 tc_aout_fix_to_chars (char *where,
 754                       fixS *fixP,
 755                       relax_addressT segment_address_in_file)
 756 {
 757   long r_symbolnum;
 758
 759 #if DEBUG
 760   printf ("tc_aout_fix_to_chars\n");
 761 #endif
 762
 763   know (fixP->fx_r_type < BFD_RELOC_NONE);
 764   know (fixP->fx_addsy != NULL);
 765
 766   md_number_to_chars
 767     (where,
 768      fixP->fx_frag->fr_address + fixP->fx_where - segment_address_in_file,
 769      4);
 770
 771   r_symbolnum = (S_IS_DEFINED (fixP->fx_addsy)
 772      ? S_GET_TYPE (fixP->fx_addsy)
 773      : fixP->fx_addsy->sy_number);
 774
 775   where[4] = (r_symbolnum >> 16) & 0x0ff;
 776   where[5] = (r_symbolnum >> 8) & 0x0ff;
 777   where[6] = r_symbolnum & 0x0ff;
 778   where[7] = (((!S_IS_DEFINED (fixP->fx_addsy)) << 7) & 0x80) | (0 & 0x60) | (fixP->fx_r_type & 0x1F);
 779
 780   /* Also easy.  */
 781   md_number_to_chars (&where[8], fixP->fx_addnumber, 4);
 782 }
 783
 784 #endif /* OBJ_AOUT */
 785 \f
 786 const char *md_shortopts = "";
 787
 788 struct option md_longopts[] =
 789 {
 790   { NULL, no_argument, NULL, 0 }
 791 };
 792 size_t md_longopts_size = sizeof (md_longopts);
 793
 794 int
 795 md_parse_option (int c ATTRIBUTE_UNUSED, char * arg ATTRIBUTE_UNUSED)
 796 {
 797   return 0;
 798 }
 799
 800 void
 801 md_show_usage (FILE * stream ATTRIBUTE_UNUSED)
 802 {
 803 }
 804 \f
 805 /* This is called when a line is unrecognized.  This is used to handle
 806    definitions of or32 style local labels.  */
 807
 808 int
 809 or32_unrecognized_line (int c)
 810 {
 811   int lab;
 812   char *s;
 813
 814   if (c != '$'
 815       || ! ISDIGIT ((unsigned char) input_line_pointer[0]))
 816     return 0;
 817
 818   s = input_line_pointer;
 819
 820   lab = 0;
 821   while (ISDIGIT ((unsigned char) *s))
 822     {
 823       lab = lab * 10 + *s - '0';
 824       ++s;
 825     }
 826
 827   if (*s != ':')
 828     /* Not a label definition.  */
 829     return 0;
 830
 831   if (dollar_label_defined (lab))
 832     {
 833       as_bad (_("label \"$%d\" redefined"), lab);
 834       return 0;
 835     }
 836
 837   define_dollar_label (lab);
 838   colon (dollar_label_name (lab, 0));
 839   input_line_pointer = s + 1;
 840
 841   return 1;
 842 }
 843
 844 /* Default the values of symbols known that should be "predefined".  We
 845    don't bother to predefine them unless you actually use one, since there
 846    are a lot of them.  */
 847
 848 symbolS *
 849 md_undefined_symbol (char *name ATTRIBUTE_UNUSED)
 850 {
 851   return NULL;
 852 }
 853
 854 /* Parse an operand that is machine-specific.  */
 855
 856 void
 857 md_operand (expressionS *expressionP)
 858 {
 859 #if DEBUG
 860   printf ("  md_operand(input_line_pointer = %s)\n", input_line_pointer);
 861 #endif
 862
 863   if (input_line_pointer[0] == REGISTER_PREFIX && input_line_pointer[1] == 'r')
 864     {
 865       /* We have a numeric register expression.  No biggy.  */
 866       input_line_pointer += 2;  /* Skip %r */
 867       (void) expression (expressionP);
 868
 869       if (expressionP->X_op != O_constant
 870           || expressionP->X_add_number > 255)
 871         as_bad (_("Invalid expression after %%%%\n"));
 872       expressionP->X_op = O_register;
 873     }
 874   else if (input_line_pointer[0] == '&')
 875     {
 876       /* We are taking the 'address' of a register...this one is not
 877          in the manual, but it *is* in traps/fpsymbol.h!  What they
 878          seem to want is the register number, as an absolute number.  */
 879       input_line_pointer++; /* Skip & */
 880       (void) expression (expressionP);
 881
 882       if (expressionP->X_op != O_register)
 883         as_bad (_("invalid register in & expression"));
 884       else
 885         expressionP->X_op = O_constant;
 886     }
 887   else if (input_line_pointer[0] == '$'
 888            && ISDIGIT ((unsigned char) input_line_pointer[1]))
 889     {
 890       long lab;
 891       char *name;
 892       symbolS *sym;
 893
 894       /* This is a local label.  */
 895       ++input_line_pointer;
 896       lab = (long) get_absolute_expression ();
 897
 898       if (dollar_label_defined (lab))
 899         {
 900           name = dollar_label_name (lab, 0);
 901           sym = symbol_find (name);
 902         }
 903       else
 904         {
 905           name = dollar_label_name (lab, 1);
 906           sym = symbol_find_or_make (name);
 907         }
 908
 909       expressionP->X_op = O_symbol;
 910       expressionP->X_add_symbol = sym;
 911       expressionP->X_add_number = 0;
 912     }
 913   else if (input_line_pointer[0] == '$')
 914     {
 915       char *s;
 916       char type;
 917       int fieldnum, fieldlimit;
 918       LITTLENUM_TYPE floatbuf[8];
 919
 920       /* $float(), $doubleN(), or $extendN() convert floating values
 921          to integers.  */
 922       s = input_line_pointer;
 923
 924       ++s;
 925
 926       fieldnum = 0;
 927       if (strncmp (s, "double", sizeof "double" - 1) == 0)
 928         {
 929           s += sizeof "double" - 1;
 930           type = 'd';
 931           fieldlimit = 2;
 932         }
 933       else if (strncmp (s, "float", sizeof "float" - 1) == 0)
 934         {
 935           s += sizeof "float" - 1;
 936           type = 'f';
 937           fieldlimit = 1;
 938         }
 939       else if (strncmp (s, "extend", sizeof "extend" - 1) == 0)
 940         {
 941           s += sizeof "extend" - 1;
 942           type = 'x';
 943           fieldlimit = 4;
 944         }
 945       else
 946         return;
 947
 948       if (ISDIGIT (*s))
 949         {
 950           fieldnum = *s - '0';
 951           ++s;
 952         }
 953       if (fieldnum >= fieldlimit)
 954         return;
 955
 956       SKIP_WHITESPACE ();
 957       if (*s != '(')
 958         return;
 959       ++s;
 960       SKIP_WHITESPACE ();
 961
 962       s = atof_ieee (s, type, floatbuf);
 963       if (s == NULL)
 964         return;
 965       s = s;
 966
 967       SKIP_WHITESPACE ();
 968       if (*s != ')')
 969         return;
 970       ++s;
 971       SKIP_WHITESPACE ();
 972
 973       input_line_pointer = s;
 974       expressionP->X_op = O_constant;
 975       expressionP->X_unsigned = 1;
 976       expressionP->X_add_number = ((floatbuf[fieldnum * 2]
 977                                     << LITTLENUM_NUMBER_OF_BITS)
 978                                    + floatbuf[fieldnum * 2 + 1]);
 979     }
 980 }
 981
 982 /* Round up a section size to the appropriate boundary.  */
 983
 984 valueT
 985 md_section_align (segT segment ATTRIBUTE_UNUSED, valueT size ATTRIBUTE_UNUSED)
 986 {
 987   return size;      /* Byte alignment is fine.  */
 988 }
 989
 990 /* Exactly what point is a PC-relative offset relative TO?
 991    On the 29000, they're relative to the address of the instruction,
 992    which we have set up as the address of the fixup too.  */
 993
 994 long
 995 md_pcrel_from (fixS *fixP)
 996 {
 997   return fixP->fx_where + fixP->fx_frag->fr_address;
 998 }
 999
1000 /* Generate a reloc for a fixup.  */
1001
1002 arelent *
1003 tc_gen_reloc (asection *seg ATTRIBUTE_UNUSED, fixS *fixp)
1004 {
1005   arelent *reloc;
1006
1007   reloc = xmalloc (sizeof (arelent));
1008   reloc->sym_ptr_ptr = xmalloc (sizeof (asymbol *));
1009   *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
1010   reloc->address = fixp->fx_frag->fr_address + fixp->fx_where;
1011   /*  reloc->address = fixp->fx_frag->fr_address + fixp->fx_where + fixp->fx_addnumber;*/
1012   reloc->howto = bfd_reloc_type_lookup (stdoutput, fixp->fx_r_type);
1013
1014   if (reloc->howto == (reloc_howto_type *) NULL)
1015     {
1016       as_bad_where (fixp->fx_file, fixp->fx_line,
1017                     _("reloc %d not supported by object file format"),
1018                     (int) fixp->fx_r_type);
1019       return NULL;
1020     }
1021
1022   if (fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
1023     reloc->address = fixp->fx_offset;
1024
1025   reloc->addend = fixp->fx_addnumber;
1026   return reloc;
1027 }