gas/config/tc-pdp11.c

   1 /* tc-pdp11.c - pdp11-specific -
   2    Copyright (C) 2001-2020 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 3, 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, 51 Franklin Street - Fifth Floor,
  19    Boston, MA 02110-1301, USA.  */
  20
  21 #include "as.h"
  22 #include "safe-ctype.h"
  23 #include "opcode/pdp11.h"
  24
  25 extern int flonum_gen2vax (int, FLONUM_TYPE * f, LITTLENUM_TYPE *);
  26
  27 #define TRUE  1
  28 #define FALSE 0
  29
  30 /* A representation for PDP-11 machine code.  */
  31 struct pdp11_code
  32 {
  33   const char *error;
  34   int code;
  35   int additional;       /* Is there an additional word?  */
  36   int word;             /* Additional word, if any.  */
  37   struct
  38   {
  39     bfd_reloc_code_real_type type;
  40     expressionS exp;
  41     int pc_rel;
  42   } reloc;
  43 };
  44
  45 /* Instruction set extensions.
  46
  47    If you change this from an array to something else, please update
  48    the "PDP-11 instruction set extensions" comment in pdp11.h.  */
  49 int pdp11_extension[PDP11_EXT_NUM];
  50
  51 /* Assembly options.  */
  52
  53 #define ASM_OPT_PIC 1
  54 #define ASM_OPT_NUM 2
  55
  56 int asm_option[ASM_OPT_NUM];
  57
  58 /* These chars start a comment anywhere in a source file (except inside
  59    another comment.  */
  60 const char comment_chars[] = "#/";
  61
  62 /* These chars only start a comment at the beginning of a line.  */
  63 const char line_comment_chars[] = "#/";
  64
  65 const char line_separator_chars[] = ";";
  66
  67 /* Chars that can be used to separate mant from exp in floating point nums.  */
  68 const char EXP_CHARS[] = "eE";
  69
  70 /* Chars that mean this number is a floating point constant.  */
  71 /* as in 0f123.456.  */
  72 /* or    0H1.234E-12 (see exp chars above).  */
  73 const char FLT_CHARS[] = "dDfF";
  74
  75 void pseudo_even (int);
  76 void pseudo_bss (int);
  77
  78 const pseudo_typeS md_pseudo_table[] =
  79 {
  80   { "bss", pseudo_bss, 0 },
  81   { "even", pseudo_even, 0 },
  82   { 0, 0, 0 },
  83 };
  84
  85 static struct hash_control *insn_hash = NULL;
  86 \f
  87 static int
  88 set_option (const char *arg)
  89 {
  90   int yes = 1;
  91
  92   if (strcmp (arg, "all-extensions") == 0
  93       || strcmp (arg, "all") == 0)
  94     {
  95       memset (pdp11_extension, ~0, sizeof pdp11_extension);
  96       pdp11_extension[PDP11_NONE] = 0;
  97       return 1;
  98     }
  99   else if (strcmp (arg, "no-extensions") == 0)
 100     {
 101       memset (pdp11_extension, 0, sizeof pdp11_extension);
 102       pdp11_extension[PDP11_BASIC] = 1;
 103       return 1;
 104     }
 105
 106   if (strncmp (arg, "no-", 3) == 0)
 107     {
 108       yes = 0;
 109       arg += 3;
 110     }
 111
 112   /* Commercial instructions.  */
 113   if (strcmp (arg, "cis") == 0)
 114     pdp11_extension[PDP11_CIS] = yes;
 115   /* Call supervisor mode.  */
 116   else if (strcmp (arg, "csm") == 0)
 117     pdp11_extension[PDP11_CSM] = yes;
 118   /* Extended instruction set.  */
 119   else if (strcmp (arg, "eis") == 0)
 120     pdp11_extension[PDP11_EIS] = pdp11_extension[PDP11_LEIS] = yes;
 121   /* KEV11 floating-point.  */
 122   else if (strcmp (arg, "fis") == 0
 123            || strcmp (arg, "kev11") == 0
 124            || strcmp (arg, "kev-11") == 0)
 125     pdp11_extension[PDP11_FIS] = yes;
 126   /* FP-11 floating-point.  */
 127   else if (strcmp (arg, "fpp") == 0
 128            || strcmp (arg, "fpu") == 0
 129            || strcmp (arg, "fp11") == 0
 130            || strcmp (arg, "fp-11") == 0
 131            || strcmp (arg, "fpj11") == 0
 132            || strcmp (arg, "fp-j11") == 0
 133            || strcmp (arg, "fpj-11") == 0)
 134     pdp11_extension[PDP11_FPP] = yes;
 135   /* Limited extended insns.  */
 136   else if (strcmp (arg, "limited-eis") == 0)
 137     {
 138       pdp11_extension[PDP11_LEIS] = yes;
 139       if (!pdp11_extension[PDP11_LEIS])
 140         pdp11_extension[PDP11_EIS] = 0;
 141     }
 142   /* Move from processor type.  */
 143   else if (strcmp (arg, "mfpt") == 0)
 144     pdp11_extension[PDP11_MFPT] = yes;
 145   /* Multiprocessor insns:  */
 146   else if (strncmp (arg, "mproc", 5) == 0
 147            /* TSTSET, WRTLCK */
 148            || strncmp (arg, "multiproc", 9) == 0)
 149     pdp11_extension[PDP11_MPROC] = yes;
 150   /* Move from/to proc status.  */
 151   else if (strcmp (arg, "mxps") == 0)
 152     pdp11_extension[PDP11_MXPS] = yes;
 153   /* Position-independent code.  */
 154   else if (strcmp (arg, "pic") == 0)
 155     asm_option[ASM_OPT_PIC] = yes;
 156   /* Set priority level.  */
 157   else if (strcmp (arg, "spl") == 0)
 158     pdp11_extension[PDP11_SPL] = yes;
 159   /* Microcode instructions:  */
 160   else if (strcmp (arg, "ucode") == 0
 161            /* LDUB, MED, XFC */
 162            || strcmp (arg, "microcode") == 0)
 163     pdp11_extension[PDP11_UCODE] = yes;
 164   else
 165     return 0;
 166
 167   return 1;
 168 }
 169
 170
 171 static void
 172 init_defaults (void)
 173 {
 174   static int first = 1;
 175
 176   if (first)
 177     {
 178       set_option ("all-extensions");
 179       set_option ("pic");
 180       first = 0;
 181     }
 182 }
 183
 184 void
 185 md_begin (void)
 186 {
 187   int i;
 188
 189   init_defaults ();
 190
 191   insn_hash = hash_new ();
 192   if (insn_hash == NULL)
 193     as_fatal (_("Virtual memory exhausted"));
 194
 195   for (i = 0; i < pdp11_num_opcodes; i++)
 196     hash_insert (insn_hash, pdp11_opcodes[i].name, (void *) (pdp11_opcodes + i));
 197   for (i = 0; i < pdp11_num_aliases; i++)
 198     hash_insert (insn_hash, pdp11_aliases[i].name, (void *) (pdp11_aliases + i));
 199 }
 200
 201 void
 202 md_number_to_chars (char con[], valueT value, int nbytes)
 203 {
 204   /* On a PDP-11, 0x1234 is stored as "\x12\x34", and
 205      0x12345678 is stored as "\x56\x78\x12\x34". It's
 206      anyone's guess what 0x123456 would be stored like.  */
 207
 208   switch (nbytes)
 209     {
 210     case 0:
 211       break;
 212     case 1:
 213       con[0] =  value       & 0xff;
 214       break;
 215     case 2:
 216       con[0] =  value        & 0xff;
 217       con[1] = (value >>  8) & 0xff;
 218       break;
 219     case 4:
 220       con[0] = (value >> 16) & 0xff;
 221       con[1] = (value >> 24) & 0xff;
 222       con[2] =  value        & 0xff;
 223       con[3] = (value >>  8) & 0xff;
 224       break;
 225     default:
 226       BAD_CASE (nbytes);
 227     }
 228 }
 229
 230 /* Fix up some data or instructions after we find out the value of a symbol
 231    that they reference.  Knows about order of bytes in address.  */
 232
 233 void
 234 md_apply_fix (fixS *fixP,
 235                valueT * valP,
 236                segT seg ATTRIBUTE_UNUSED)
 237 {
 238   valueT code;
 239   valueT mask;
 240   valueT val = * valP;
 241   char *buf;
 242   int shift;
 243   int size;
 244
 245   buf = fixP->fx_where + fixP->fx_frag->fr_literal;
 246   size = fixP->fx_size;
 247   code = md_chars_to_number ((unsigned char *) buf, size);
 248
 249   switch (fixP->fx_r_type)
 250     {
 251     case BFD_RELOC_8:
 252       mask = 0xff;
 253       shift = 0;
 254       break;
 255     case BFD_RELOC_16:
 256     case BFD_RELOC_16_PCREL:
 257       mask = 0xffff;
 258       shift = 0;
 259       break;
 260     case BFD_RELOC_32:
 261       mask = 0xffffffff;
 262       shift = 0;
 263       break;
 264     case BFD_RELOC_PDP11_DISP_8_PCREL:
 265       mask = 0x00ff;
 266       shift = 1;
 267       break;
 268     case BFD_RELOC_PDP11_DISP_6_PCREL:
 269       mask = 0x003f;
 270       shift = 1;
 271       val = -val;
 272       break;
 273     default:
 274       BAD_CASE (fixP->fx_r_type);
 275     }
 276
 277   if (fixP->fx_addsy != NULL)
 278     val += symbol_get_bfdsym (fixP->fx_addsy)->section->vma;
 279     /* *value += fixP->fx_addsy->bsym->section->vma; */
 280
 281   code &= ~mask;
 282   code |= (val >> shift) & mask;
 283   number_to_chars_littleendian (buf, code, size);
 284
 285   if (fixP->fx_addsy == NULL && fixP->fx_pcrel == 0)
 286     fixP->fx_done = 1;
 287 }
 288
 289 long
 290 md_chars_to_number (unsigned char *con, int nbytes)
 291 {
 292   /* On a PDP-11, 0x1234 is stored as "\x12\x34", and
 293      0x12345678 is stored as "\x56\x78\x12\x34". It's
 294      anyone's guess what 0x123456 would be stored like.  */
 295   switch (nbytes)
 296     {
 297     case 0:
 298       return 0;
 299     case 1:
 300       return con[0];
 301     case 2:
 302       return (con[1] << BITS_PER_CHAR) | con[0];
 303     case 4:
 304       return
 305         (((con[1] << BITS_PER_CHAR) | con[0]) << (2 * BITS_PER_CHAR))
 306         |((con[3] << BITS_PER_CHAR) | con[2]);
 307     default:
 308       BAD_CASE (nbytes);
 309       return 0;
 310     }
 311 }
 312 \f
 313 static char *
 314 skip_whitespace (char *str)
 315 {
 316   while (*str == ' ' || *str == '\t')
 317     str++;
 318   return str;
 319 }
 320
 321 static char *
 322 find_whitespace (char *str)
 323 {
 324   while (*str != ' ' && *str != '\t' && *str != 0)
 325     str++;
 326   return str;
 327 }
 328
 329 static char *
 330 parse_reg (char *str, struct pdp11_code *operand)
 331 {
 332   str = skip_whitespace (str);
 333   if (TOLOWER (*str) == 'r')
 334     {
 335       str++;
 336       switch (*str)
 337         {
 338         case '0': case '1': case '2': case '3':
 339         case '4': case '5': case '6': case '7':
 340           operand->code = *str - '0';
 341           str++;
 342           break;
 343         default:
 344           operand->error = _("Bad register name");
 345           return str - 1;
 346         }
 347     }
 348   else if (strncmp (str, "sp", 2) == 0
 349            || strncmp (str, "SP", 2) == 0)
 350     {
 351       operand->code = 6;
 352       str += 2;
 353     }
 354   else if (strncmp (str, "pc", 2) == 0
 355            || strncmp (str, "PC", 2) == 0)
 356     {
 357       operand->code = 7;
 358       str += 2;
 359     }
 360   else
 361     operand->error = _("Bad register name");
 362
 363   return str;
 364 }
 365
 366 static char *
 367 parse_ac5 (char *str, struct pdp11_code *operand)
 368 {
 369   str = skip_whitespace (str);
 370   if (strncmp (str, "fr", 2) == 0
 371       || strncmp (str, "FR", 2) == 0
 372       || strncmp (str, "ac", 2) == 0
 373       || strncmp (str, "AC", 2) == 0)
 374     {
 375       str += 2;
 376       switch (*str)
 377         {
 378         case '0': case '1': case '2': case '3':
 379         case '4': case '5':
 380           operand->code = *str - '0';
 381           str++;
 382           break;
 383         default:
 384           operand->error = _("Bad register name");
 385           return str - 2;
 386         }
 387     }
 388   else
 389     {
 390       operand->error = _("Bad register name");
 391       return str;
 392     }
 393
 394   return str;
 395 }
 396
 397 static char *
 398 parse_ac (char *str, struct pdp11_code *operand)
 399 {
 400   str = parse_ac5 (str, operand);
 401   if (!operand->error && operand->code > 3)
 402     {
 403       operand->error = _("Bad register name");
 404           return str - 3;
 405     }
 406
 407   return str;
 408 }
 409
 410 static char *
 411 parse_expression (char *str, struct pdp11_code *operand)
 412 {
 413   char *save_input_line_pointer;
 414   segT seg;
 415
 416   save_input_line_pointer = input_line_pointer;
 417   input_line_pointer = str;
 418   seg = expression (&operand->reloc.exp);
 419   if (seg == NULL)
 420     {
 421       input_line_pointer = save_input_line_pointer;
 422       operand->error = _("Error in expression");
 423       return str;
 424     }
 425
 426   str = input_line_pointer;
 427   input_line_pointer = save_input_line_pointer;
 428
 429   operand->reloc.pc_rel = 0;
 430
 431   return str;
 432 }
 433
 434 static char *
 435 parse_op_no_deferred (char *str, struct pdp11_code *operand)
 436 {
 437   LITTLENUM_TYPE literal_float[2];
 438
 439   str = skip_whitespace (str);
 440
 441   switch (*str)
 442     {
 443     case '(':                           /* (rn) and (rn)+ */
 444       str = parse_reg (str + 1, operand);
 445       if (operand->error)
 446         return str;
 447       str = skip_whitespace (str);
 448       if (*str != ')')
 449         {
 450           operand->error = _("Missing ')'");
 451           return str;
 452         }
 453       str++;
 454       if (*str == '+')
 455         {
 456           operand->code |= 020;
 457           str++;
 458         }
 459       else
 460         {
 461           operand->code |= 010;
 462         }
 463       break;
 464
 465       /* Immediate.  */
 466     case '#':
 467     case '$':
 468       str = parse_expression (str + 1, operand);
 469       if (operand->error)
 470         return str;
 471       operand->additional = TRUE;
 472       operand->word = operand->reloc.exp.X_add_number;
 473       switch (operand->reloc.exp.X_op)
 474         {
 475         case O_constant:
 476           break;
 477         case O_symbol:
 478         case O_add:
 479         case O_subtract:
 480           operand->reloc.type = BFD_RELOC_16;
 481           operand->reloc.pc_rel = 0;
 482           break;
 483         case O_big:
 484           if (operand->reloc.exp.X_add_number > 0)
 485             {
 486               operand->error = _("Error in expression");
 487               break;
 488             }
 489           /* It's a floating literal...  */
 490           know (operand->reloc.exp.X_add_number < 0);
 491           flonum_gen2vax ('f', &generic_floating_point_number, literal_float);
 492           operand->word = literal_float[0];
 493           if (literal_float[1] != 0)
 494             as_warn (_("Low order bits truncated in immediate float operand"));
 495           break;
 496         default:
 497           operand->error = _("Error in expression");
 498           break;
 499         }
 500       operand->code = 027;
 501       break;
 502
 503       /* label, d(rn), -(rn)  */
 504     default:
 505       {
 506         if (strncmp (str, "-(", 2) == 0)        /* -(rn) */
 507           {
 508             str = parse_reg (str + 2, operand);
 509             if (operand->error)
 510               return str;
 511             str = skip_whitespace (str);
 512             if (*str != ')')
 513               {
 514                 operand->error = _("Missing ')'");
 515                 return str;
 516               }
 517             operand->code |= 040;
 518             str++;
 519             break;
 520           }
 521
 522         str = parse_expression (str, operand);
 523         if (operand->error)
 524           return str;
 525
 526         str = skip_whitespace (str);
 527
 528         if (*str != '(')
 529           {
 530             operand->code = 067;
 531             operand->additional = 1;
 532             operand->word = 0;
 533             operand->reloc.type = BFD_RELOC_16_PCREL;
 534             operand->reloc.pc_rel = 1;
 535             break;
 536           }
 537
 538         /* d(rn) */
 539         str++;
 540         str = parse_reg (str, operand);
 541         if (operand->error)
 542           return str;
 543
 544         str = skip_whitespace (str);
 545
 546         if (*str != ')')
 547           {
 548             operand->error = _("Missing ')'");
 549             return str;
 550           }
 551
 552         str++;
 553         operand->additional = TRUE;
 554         operand->code |= 060;
 555         switch (operand->reloc.exp.X_op)
 556           {
 557           case O_symbol:
 558             operand->reloc.type = BFD_RELOC_16;
 559             operand->reloc.pc_rel = 0;
 560             break;
 561           case O_constant:
 562             if ((operand->code & 7) == 7)
 563               {
 564                 operand->reloc.pc_rel = 1;
 565                 operand->word = operand->reloc.exp.X_add_number;
 566               }
 567             else
 568               operand->word = operand->reloc.exp.X_add_number;
 569
 570             break;
 571           default:
 572             BAD_CASE (operand->reloc.exp.X_op);
 573           }
 574         break;
 575       }
 576     }
 577
 578   return str;
 579 }
 580
 581 static char *
 582 parse_op_noreg (char *str, struct pdp11_code *operand)
 583 {
 584   str = skip_whitespace (str);
 585   operand->error = NULL;
 586
 587   if (*str == '@' || *str == '*')
 588     {
 589       /* @(Rn) == @0(Rn): Mode 7, Indexed deferred.
 590          Check for auto-increment deferred.  */
 591       if (str[1] == '('
 592           && str[2] != 0
 593           && str[3] != 0
 594           && str[4] != 0
 595           && str[5] != '+')
 596         {
 597           /* Change implied to explicit index deferred.  */
 598           *str = '0';
 599           str = parse_op_no_deferred (str, operand);
 600         }
 601       else
 602         {
 603           /* @Rn == (Rn): Register deferred.  */
 604           str = parse_reg (str + 1, operand);
 605
 606           /* Not @Rn */
 607           if (operand->error)
 608             {
 609               operand->error = NULL;
 610               str = parse_op_no_deferred (str, operand);
 611             }
 612         }
 613
 614       if (operand->error)
 615         return str;
 616
 617       operand->code |= 010;
 618     }
 619   else
 620     str = parse_op_no_deferred (str, operand);
 621
 622   return str;
 623 }
 624
 625 static char *
 626 parse_op (char *str, struct pdp11_code *operand)
 627 {
 628   str = skip_whitespace (str);
 629
 630   str = parse_reg (str, operand);
 631   if (!operand->error)
 632     return str;
 633
 634   operand->error = NULL;
 635   parse_ac5 (str, operand);
 636   if (!operand->error)
 637     {
 638       operand->error = _("Float AC not legal as integer operand");
 639       return str;
 640     }
 641
 642   return parse_op_noreg (str, operand);
 643 }
 644
 645 static char *
 646 parse_fop (char *str, struct pdp11_code *operand)
 647 {
 648   str = skip_whitespace (str);
 649
 650   str = parse_ac5 (str, operand);
 651   if (!operand->error)
 652     return str;
 653
 654   operand->error = NULL;
 655   parse_reg (str, operand);
 656   if (!operand->error)
 657     {
 658       operand->error = _("General register not legal as float operand");
 659       return str;
 660     }
 661
 662   return parse_op_noreg (str, operand);
 663 }
 664
 665 static char *
 666 parse_separator (char *str, int *error)
 667 {
 668   str = skip_whitespace (str);
 669   *error = (*str != ',');
 670   if (!*error)
 671     str++;
 672   return str;
 673 }
 674
 675 void
 676 md_assemble (char *instruction_string)
 677 {
 678   const struct pdp11_opcode *op;
 679   struct pdp11_code insn, op1, op2;
 680   int error;
 681   int size;
 682   const char *err = NULL;
 683   char *str;
 684   char *p;
 685   char c;
 686
 687   str = skip_whitespace (instruction_string);
 688   p = find_whitespace (str);
 689   if (p - str == 0)
 690     {
 691       as_bad (_("No instruction found"));
 692       return;
 693     }
 694
 695   c = *p;
 696   *p = '\0';
 697   op = (struct pdp11_opcode *)hash_find (insn_hash, str);
 698   *p = c;
 699   if (op == 0)
 700     {
 701       as_bad (_("Unknown instruction '%s'"), str);
 702       return;
 703     }
 704
 705   if (!pdp11_extension[op->extension])
 706     {
 707       as_warn (_("Unsupported instruction set extension: %s"), op->name);
 708       return;
 709     }
 710
 711   insn.error = NULL;
 712   insn.code = op->opcode;
 713   insn.reloc.type = BFD_RELOC_NONE;
 714   op1.error = NULL;
 715   op1.additional = FALSE;
 716   op1.reloc.type = BFD_RELOC_NONE;
 717   op2.error = NULL;
 718   op2.additional = FALSE;
 719   op2.reloc.type = BFD_RELOC_NONE;
 720
 721   str = p;
 722   size = 2;
 723
 724   switch (op->type)
 725     {
 726     case PDP11_OPCODE_NO_OPS:
 727       str = skip_whitespace (str);
 728       break;
 729
 730     case PDP11_OPCODE_IMM3:
 731     case PDP11_OPCODE_IMM6:
 732     case PDP11_OPCODE_IMM8:
 733       str = skip_whitespace (str);
 734       if (*str == '#' || *str == '$')
 735         str++;
 736       str = parse_expression (str, &op1);
 737       if (op1.error)
 738         break;
 739       if (op1.reloc.exp.X_op != O_constant || op1.reloc.type != BFD_RELOC_NONE)
 740         {
 741           op1.error = _("operand is not an absolute constant");
 742           break;
 743         }
 744       switch (op->type)
 745         {
 746         case PDP11_OPCODE_IMM3:
 747           if (op1.reloc.exp.X_add_number & ~7)
 748             {
 749               op1.error = _("3-bit immediate out of range");
 750               break;
 751             }
 752           break;
 753         case PDP11_OPCODE_IMM6:
 754           if (op1.reloc.exp.X_add_number & ~0x3f)
 755             {
 756               op1.error = _("6-bit immediate out of range");
 757               break;
 758             }
 759           break;
 760         case PDP11_OPCODE_IMM8:
 761           if (op1.reloc.exp.X_add_number & ~0xff)
 762             {
 763               op1.error = _("8-bit immediate out of range");
 764               break;
 765             }
 766           break;
 767         }
 768       insn.code |= op1.reloc.exp.X_add_number;
 769       break;
 770
 771     case PDP11_OPCODE_DISPL:
 772       {
 773         char *new_pointer;
 774         new_pointer = parse_expression (str, &op1);
 775         op1.code = 0;
 776         op1.reloc.pc_rel = 1;
 777         op1.reloc.type = BFD_RELOC_PDP11_DISP_8_PCREL;
 778         if (op1.reloc.exp.X_op != O_symbol)
 779           {
 780             op1.error = _("Symbol expected");
 781             break;
 782           }
 783         if (op1.code & ~0xff)
 784           {
 785             err = _("8-bit displacement out of range");
 786             break;
 787           }
 788         str = new_pointer;
 789         insn.code |= op1.code;
 790         insn.reloc = op1.reloc;
 791       }
 792       break;
 793
 794     case PDP11_OPCODE_REG:
 795       str = parse_reg (str, &op1);
 796       if (op1.error)
 797         break;
 798       insn.code |= op1.code;
 799       break;
 800
 801     case PDP11_OPCODE_OP:
 802       str = parse_op (str, &op1);
 803       if (op1.error)
 804         break;
 805       insn.code |= op1.code;
 806       if (op1.additional)
 807         size += 2;
 808       break;
 809
 810     case PDP11_OPCODE_FOP:
 811       str = parse_fop (str, &op1);
 812       if (op1.error)
 813         break;
 814       insn.code |= op1.code;
 815       if (op1.additional)
 816         size += 2;
 817       break;
 818
 819     case PDP11_OPCODE_REG_OP:
 820       str = parse_reg (str, &op2);
 821       if (op2.error)
 822         break;
 823       insn.code |= op2.code << 6;
 824       str = parse_separator (str, &error);
 825       if (error)
 826         {
 827           op2.error = _("Missing ','");
 828           break;
 829         }
 830       str = parse_op (str, &op1);
 831       if (op1.error)
 832         break;
 833       insn.code |= op1.code;
 834       if (op1.additional)
 835         size += 2;
 836       break;
 837
 838     case PDP11_OPCODE_REG_OP_REV:
 839       str = parse_op (str, &op1);
 840       if (op1.error)
 841         break;
 842       insn.code |= op1.code;
 843       if (op1.additional)
 844         size += 2;
 845       str = parse_separator (str, &error);
 846       if (error)
 847         {
 848           op2.error = _("Missing ','");
 849           break;
 850         }
 851       str = parse_reg (str, &op2);
 852       if (op2.error)
 853         break;
 854       insn.code |= op2.code << 6;
 855       break;
 856
 857     case PDP11_OPCODE_AC_FOP:
 858       str = parse_ac (str, &op2);
 859       if (op2.error)
 860         break;
 861       insn.code |= op2.code << 6;
 862       str = parse_separator (str, &error);
 863       if (error)
 864         {
 865           op1.error = _("Missing ','");
 866           break;
 867         }
 868       str = parse_fop (str, &op1);
 869       if (op1.error)
 870         break;
 871       insn.code |= op1.code;
 872       if (op1.additional)
 873         size += 2;
 874       break;
 875
 876     case PDP11_OPCODE_FOP_AC:
 877       str = parse_fop (str, &op1);
 878       if (op1.error)
 879         break;
 880       insn.code |= op1.code;
 881       if (op1.additional)
 882         size += 2;
 883       str = parse_separator (str, &error);
 884       if (error)
 885         {
 886           op1.error = _("Missing ','");
 887           break;
 888         }
 889       str = parse_ac (str, &op2);
 890       if (op2.error)
 891         break;
 892       insn.code |= op2.code << 6;
 893       break;
 894
 895     case PDP11_OPCODE_AC_OP:
 896       str = parse_ac (str, &op2);
 897       if (op2.error)
 898         break;
 899       insn.code |= op2.code << 6;
 900       str = parse_separator (str, &error);
 901       if (error)
 902         {
 903           op1.error = _("Missing ','");
 904           break;
 905         }
 906       str = parse_op (str, &op1);
 907       if (op1.error)
 908         break;
 909       insn.code |= op1.code;
 910       if (op1.additional)
 911         size += 2;
 912       break;
 913
 914     case PDP11_OPCODE_OP_AC:
 915       str = parse_op (str, &op1);
 916       if (op1.error)
 917         break;
 918       insn.code |= op1.code;
 919       if (op1.additional)
 920         size += 2;
 921       str = parse_separator (str, &error);
 922       if (error)
 923         {
 924           op1.error = _("Missing ','");
 925           break;
 926         }
 927       str = parse_ac (str, &op2);
 928       if (op2.error)
 929         break;
 930       insn.code |= op2.code << 6;
 931       break;
 932
 933     case PDP11_OPCODE_OP_OP:
 934       str = parse_op (str, &op1);
 935       if (op1.error)
 936         break;
 937       insn.code |= op1.code << 6;
 938       if (op1.additional)
 939         size += 2;
 940       str = parse_separator (str, &error);
 941       if (error)
 942         {
 943           op2.error = _("Missing ','");
 944           break;
 945         }
 946       str = parse_op (str, &op2);
 947       if (op2.error)
 948         break;
 949       insn.code |= op2.code;
 950       if (op2.additional)
 951         size += 2;
 952       break;
 953
 954     case PDP11_OPCODE_REG_DISPL:
 955       {
 956         char *new_pointer;
 957         str = parse_reg (str, &op2);
 958         if (op2.error)
 959           break;
 960         insn.code |= op2.code << 6;
 961         str = parse_separator (str, &error);
 962         if (error)
 963           {
 964             op1.error = _("Missing ','");
 965             break;
 966           }
 967         new_pointer = parse_expression (str, &op1);
 968         op1.code = 0;
 969         op1.reloc.pc_rel = 1;
 970         op1.reloc.type = BFD_RELOC_PDP11_DISP_6_PCREL;
 971         if (op1.reloc.exp.X_op != O_symbol)
 972           {
 973             op1.error = _("Symbol expected");
 974             break;
 975           }
 976         if (op1.code & ~0x3f)
 977           {
 978             err = _("6-bit displacement out of range");
 979             break;
 980           }
 981         str = new_pointer;
 982         insn.code |= op1.code;
 983         insn.reloc = op1.reloc;
 984       }
 985       break;
 986
 987     default:
 988       BAD_CASE (op->type);
 989     }
 990
 991   if (op1.error)
 992     err = op1.error;
 993   else if (op2.error)
 994     err = op2.error;
 995   else
 996     {
 997       str = skip_whitespace (str);
 998       if (*str)
 999         err = _("Too many operands");
1000     }
1001
1002   {
1003     char *to = NULL;
1004
1005     if (err)
1006       {
1007         as_bad ("%s", err);
1008         return;
1009       }
1010
1011     to = frag_more (size);
1012
1013     md_number_to_chars (to, insn.code, 2);
1014     if (insn.reloc.type != BFD_RELOC_NONE)
1015       fix_new_exp (frag_now, to - frag_now->fr_literal, 2,
1016                    &insn.reloc.exp, insn.reloc.pc_rel, insn.reloc.type);
1017     to += 2;
1018
1019     if (op1.additional)
1020       {
1021         md_number_to_chars (to, op1.word, 2);
1022         if (op1.reloc.type != BFD_RELOC_NONE)
1023           fix_new_exp (frag_now, to - frag_now->fr_literal, 2,
1024                        &op1.reloc.exp, op1.reloc.pc_rel, op1.reloc.type);
1025         to += 2;
1026       }
1027
1028     if (op2.additional)
1029       {
1030         md_number_to_chars (to, op2.word, 2);
1031         if (op2.reloc.type != BFD_RELOC_NONE)
1032           fix_new_exp (frag_now, to - frag_now->fr_literal, 2,
1033                        &op2.reloc.exp, op2.reloc.pc_rel, op2.reloc.type);
1034       }
1035   }
1036 }
1037
1038 int
1039 md_estimate_size_before_relax (fragS *fragP ATTRIBUTE_UNUSED,
1040                                segT segment ATTRIBUTE_UNUSED)
1041 {
1042   return 0;
1043 }
1044
1045 void
1046 md_convert_frag (bfd *headers ATTRIBUTE_UNUSED,
1047                  segT seg ATTRIBUTE_UNUSED,
1048                  fragS *fragP ATTRIBUTE_UNUSED)
1049 {
1050 }
1051
1052 int md_short_jump_size = 2;
1053 int md_long_jump_size = 4;
1054
1055 void
1056 md_create_short_jump (char *ptr ATTRIBUTE_UNUSED,
1057                       addressT from_addr ATTRIBUTE_UNUSED,
1058                       addressT to_addr ATTRIBUTE_UNUSED,
1059                       fragS *frag ATTRIBUTE_UNUSED,
1060                       symbolS *to_symbol ATTRIBUTE_UNUSED)
1061 {
1062 }
1063
1064 void
1065 md_create_long_jump (char *ptr ATTRIBUTE_UNUSED,
1066                      addressT from_addr ATTRIBUTE_UNUSED,
1067                      addressT to_addr ATTRIBUTE_UNUSED,
1068                      fragS *frag ATTRIBUTE_UNUSED,
1069                      symbolS *to_symbol ATTRIBUTE_UNUSED)
1070 {
1071 }
1072
1073 static int
1074 set_cpu_model (const char *arg)
1075 {
1076   char buf[4];
1077   char *model = buf;
1078
1079   if (arg[0] == 'k')
1080     arg++;
1081
1082   *model++ = *arg++;
1083
1084   if (strchr ("abdx", model[-1]) == NULL)
1085     return 0;
1086
1087   if (model[-1] == 'd')
1088     {
1089       if (arg[0] == 'f' || arg[0] == 'j')
1090         model[-1] = *arg++;
1091     }
1092   else if (model[-1] == 'x')
1093     {
1094       if (arg[0] == 't')
1095         model[-1] = *arg++;
1096     }
1097
1098   if (arg[0] == '-')
1099     arg++;
1100
1101   if (strncmp (arg, "11", 2) != 0)
1102     return 0;
1103   arg += 2;
1104
1105   if (arg[0] == '-')
1106     {
1107       if (*++arg == 0)
1108         return 0;
1109     }
1110
1111   /* Allow up to two revision letters.  */
1112   if (arg[0] != 0)
1113     *model++ = *arg++;
1114   if (arg[0] != 0)
1115     *model++ = *arg++;
1116
1117   *model++ = 0;
1118
1119   set_option ("no-extensions");
1120
1121   /* KA11 (11/15/20).  */
1122   if (strncmp (buf, "a", 1) == 0)
1123     return 1; /* No extensions.  */
1124
1125   /* KB11 (11/45/50/55/70).  */
1126   else if (strncmp (buf, "b", 1) == 0)
1127     return set_option ("eis") && set_option ("spl");
1128
1129   /* KD11-A (11/35/40).  */
1130   else if (strncmp (buf, "da", 2) == 0)
1131     return set_option ("limited-eis");
1132
1133   /* KD11-B (11/05/10).  */
1134   else if (strncmp (buf, "db", 2) == 0
1135            /* KD11-D (11/04).  */
1136            || strncmp (buf, "dd", 2) == 0)
1137     return 1; /* no extensions */
1138
1139   /* KD11-E (11/34).  */
1140   else if (strncmp (buf, "de", 2) == 0)
1141     return set_option ("eis") && set_option ("mxps");
1142
1143   /* KD11-F (11/03).  */
1144   else if (strncmp (buf, "df", 2) == 0
1145            /* KD11-H (11/03).  */
1146            || strncmp (buf, "dh", 2) == 0
1147            /* KD11-Q (11/03).  */
1148            || strncmp (buf, "dq", 2) == 0)
1149     return set_option ("limited-eis") && set_option ("mxps");
1150
1151   /* KD11-K (11/60).  */
1152   else if (strncmp (buf, "dk", 2) == 0)
1153     return set_option ("eis")
1154       && set_option ("mxps")
1155       && set_option ("ucode");
1156
1157   /* KD11-Z (11/44).  */
1158   else if (strncmp (buf, "dz", 2) == 0)
1159     return set_option ("csm")
1160       && set_option ("eis")
1161       && set_option ("mfpt")
1162       && set_option ("mxps")
1163       && set_option ("spl");
1164
1165   /* F11 (11/23/24).  */
1166   else if (strncmp (buf, "f", 1) == 0)
1167     return set_option ("eis")
1168       && set_option ("mfpt")
1169       && set_option ("mxps");
1170
1171   /* J11 (11/53/73/83/84/93/94).  */
1172   else if (strncmp (buf, "j", 1) == 0)
1173     return set_option ("csm")
1174       && set_option ("eis")
1175       && set_option ("mfpt")
1176       && set_option ("multiproc")
1177       && set_option ("mxps")
1178       && set_option ("spl");
1179
1180   /* T11 (11/21).  */
1181   else if (strncmp (buf, "t", 1) == 0)
1182     return set_option ("limited-eis")
1183       && set_option ("mxps");
1184
1185   else
1186     return 0;
1187 }
1188
1189 static int
1190 set_machine_model (const char *arg)
1191 {
1192   if (strncmp (arg, "pdp-11/", 7) != 0
1193       && strncmp (arg, "pdp11/", 6) != 0
1194       && strncmp (arg, "11/", 3) != 0)
1195     return 0;
1196
1197   if (strncmp (arg, "pdp", 3) == 0)
1198     arg += 3;
1199   if (arg[0] == '-')
1200     arg++;
1201   if (strncmp (arg, "11/", 3) == 0)
1202     arg += 3;
1203
1204   if (strcmp (arg, "03") == 0)
1205     return set_cpu_model ("kd11f");
1206
1207   else if (strcmp (arg, "04") == 0)
1208     return set_cpu_model ("kd11d");
1209
1210   else if (strcmp (arg, "05") == 0
1211            || strcmp (arg, "10") == 0)
1212     return set_cpu_model ("kd11b");
1213
1214   else if (strcmp (arg, "15") == 0
1215            || strcmp (arg, "20") == 0)
1216     return set_cpu_model ("ka11");
1217
1218   else if (strcmp (arg, "21") == 0)
1219     return set_cpu_model ("t11");
1220
1221   else if (strcmp (arg, "23") == 0
1222            || strcmp (arg, "24") == 0)
1223     return set_cpu_model ("f11");
1224
1225   else if (strcmp (arg, "34") == 0
1226            || strcmp (arg, "34a") == 0)
1227     return set_cpu_model ("kd11e");
1228
1229   else if (strcmp (arg, "35") == 0
1230            || strcmp (arg, "40") == 0)
1231     return set_cpu_model ("kd11da");
1232
1233   else if (strcmp (arg, "44") == 0)
1234     return set_cpu_model ("kd11dz");
1235
1236   else if (strcmp (arg, "45") == 0
1237            || strcmp (arg, "50") == 0
1238            || strcmp (arg, "55") == 0
1239            || strcmp (arg, "70") == 0)
1240     return set_cpu_model ("kb11");
1241
1242   else if (strcmp (arg, "60") == 0)
1243     return set_cpu_model ("kd11k");
1244
1245   else if (strcmp (arg, "53") == 0
1246            || strcmp (arg, "73") == 0
1247            || strcmp (arg, "83") == 0
1248            || strcmp (arg, "84") == 0
1249            || strcmp (arg, "93") == 0
1250            || strcmp (arg, "94") == 0)
1251     return set_cpu_model ("j11")
1252       && set_option ("fpp");
1253
1254   else
1255     return 0;
1256 }
1257
1258 const char *md_shortopts = "m:";
1259
1260 struct option md_longopts[] =
1261 {
1262 #define OPTION_CPU 257
1263   { "cpu", required_argument, NULL, OPTION_CPU },
1264 #define OPTION_MACHINE 258
1265   { "machine", required_argument, NULL, OPTION_MACHINE },
1266 #define OPTION_PIC 259
1267   { "pic", no_argument, NULL, OPTION_PIC },
1268   { NULL, no_argument, NULL, 0 }
1269 };
1270
1271 size_t md_longopts_size = sizeof (md_longopts);
1272
1273 /* Invocation line includes a switch not recognized by the base assembler.
1274    See if it's a processor-specific option.  */
1275
1276 int
1277 md_parse_option (int c, const char *arg)
1278 {
1279   init_defaults ();
1280
1281   switch (c)
1282     {
1283     case 'm':
1284       if (set_option (arg))
1285         return 1;
1286       if (set_cpu_model (arg))
1287         return 1;
1288       if (set_machine_model (arg))
1289         return 1;
1290       break;
1291
1292     case OPTION_CPU:
1293       if (set_cpu_model (arg))
1294         return 1;
1295       break;
1296
1297     case OPTION_MACHINE:
1298       if (set_machine_model (arg))
1299         return 1;
1300       break;
1301
1302     case OPTION_PIC:
1303       if (set_option ("pic"))
1304         return 1;
1305       break;
1306
1307     default:
1308       break;
1309     }
1310
1311   return 0;
1312 }
1313
1314 void
1315 md_show_usage (FILE *stream)
1316 {
1317   fprintf (stream, "\
1318 \n\
1319 PDP-11 instruction set extensions:\n\
1320 \n\
1321 -m(no-)cis              allow (disallow) commercial instruction set\n\
1322 -m(no-)csm              allow (disallow) CSM instruction\n\
1323 -m(no-)eis              allow (disallow) full extended instruction set\n\
1324 -m(no-)fis              allow (disallow) KEV11 floating-point instructions\n\
1325 -m(no-)fpp              allow (disallow) FP-11 floating-point instructions\n\
1326 -m(no-)fpu              allow (disallow) FP-11 floating-point instructions\n\
1327 -m(no-)limited-eis      allow (disallow) limited extended instruction set\n\
1328 -m(no-)mfpt             allow (disallow) processor type instruction\n\
1329 -m(no-)multiproc        allow (disallow) multiprocessor instructions\n\
1330 -m(no-)mxps             allow (disallow) processor status instructions\n\
1331 -m(no-)spl              allow (disallow) SPL instruction\n\
1332 -m(no-)ucode            allow (disallow) microcode instructions\n\
1333 -mall-extensions        allow all instruction set extensions\n\
1334                         (this is the default)\n\
1335 -mno-extensions         disallow all instruction set extensions\n\
1336 -pic                    generate position-independent code\n\
1337 \n\
1338 PDP-11 CPU model options:\n\
1339 \n\
1340 -mka11*                 KA11 CPU.  base line instruction set only\n\
1341 -mkb11*                 KB11 CPU.  enable full EIS and SPL\n\
1342 -mkd11a*                KD11-A CPU.  enable limited EIS\n\
1343 -mkd11b*                KD11-B CPU.  base line instruction set only\n\
1344 -mkd11d*                KD11-D CPU.  base line instruction set only\n\
1345 -mkd11e*                KD11-E CPU.  enable full EIS, MTPS, and MFPS\n\
1346 -mkd11f*                KD11-F CPU.  enable limited EIS, MTPS, and MFPS\n\
1347 -mkd11h*                KD11-H CPU.  enable limited EIS, MTPS, and MFPS\n\
1348 -mkd11q*                KD11-Q CPU.  enable limited EIS, MTPS, and MFPS\n\
1349 -mkd11k*                KD11-K CPU.  enable full EIS, MTPS, MFPS, LDUB, MED,\n\
1350                         XFC, and MFPT\n\
1351 -mkd11z*                KD11-Z CPU.  enable full EIS, MTPS, MFPS, MFPT, SPL,\n\
1352                         and CSM\n\
1353 -mf11*                  F11 CPU.  enable full EIS, MFPS, MTPS, and MFPT\n\
1354 -mj11*                  J11 CPU.  enable full EIS, MTPS, MFPS, MFPT, SPL,\n\
1355                         CSM, TSTSET, and WRTLCK\n\
1356 -mt11*                  T11 CPU.  enable limited EIS, MTPS, and MFPS\n\
1357 \n\
1358 PDP-11 machine model options:\n\
1359 \n\
1360 -m11/03                 same as -mkd11f\n\
1361 -m11/04                 same as -mkd11d\n\
1362 -m11/05                 same as -mkd11b\n\
1363 -m11/10                 same as -mkd11b\n\
1364 -m11/15                 same as -mka11\n\
1365 -m11/20                 same as -mka11\n\
1366 -m11/21                 same as -mt11\n\
1367 -m11/23                 same as -mf11\n\
1368 -m11/24                 same as -mf11\n\
1369 -m11/34                 same as -mkd11e\n\
1370 -m11/34a                same as -mkd11e -mfpp\n\
1371 -m11/35                 same as -mkd11a\n\
1372 -m11/40                 same as -mkd11a\n\
1373 -m11/44                 same as -mkd11z\n\
1374 -m11/45                 same as -mkb11\n\
1375 -m11/50                 same as -mkb11\n\
1376 -m11/53                 same as -mj11\n\
1377 -m11/55                 same as -mkb11\n\
1378 -m11/60                 same as -mkd11k\n\
1379 -m11/70                 same as -mkb11\n\
1380 -m11/73                 same as -mj11\n\
1381 -m11/83                 same as -mj11\n\
1382 -m11/84                 same as -mj11\n\
1383 -m11/93                 same as -mj11\n\
1384 -m11/94                 same as -mj11\n\
1385 ");
1386 }
1387
1388 symbolS *
1389 md_undefined_symbol (char *name ATTRIBUTE_UNUSED)
1390 {
1391   return 0;
1392 }
1393
1394 valueT
1395 md_section_align (segT segment ATTRIBUTE_UNUSED,
1396                   valueT size)
1397 {
1398   return (size + 1) & ~1;
1399 }
1400
1401 long
1402 md_pcrel_from (fixS *fixP)
1403 {
1404   return fixP->fx_frag->fr_address + fixP->fx_where + fixP->fx_size;
1405 }
1406
1407 /* Translate internal representation of relocation info to BFD target
1408    format.  */
1409
1410 arelent *
1411 tc_gen_reloc (asection *section ATTRIBUTE_UNUSED,
1412               fixS *fixp)
1413 {
1414   arelent *reloc;
1415   bfd_reloc_code_real_type code;
1416
1417   reloc = XNEW (arelent);
1418
1419   reloc->sym_ptr_ptr = XNEW (asymbol *);
1420   *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
1421   reloc->address = fixp->fx_frag->fr_address + fixp->fx_where;
1422
1423   /* This is taken account for in md_apply_fix().  */
1424   reloc->addend = -symbol_get_bfdsym (fixp->fx_addsy)->section->vma;
1425
1426   code = fixp->fx_r_type;
1427   if (fixp->fx_pcrel)
1428     {
1429       switch (code)
1430         {
1431         case BFD_RELOC_16:
1432           code = BFD_RELOC_16_PCREL;
1433           break;
1434
1435         case BFD_RELOC_16_PCREL:
1436           break;
1437
1438         default:
1439           BAD_CASE (code);
1440           return NULL;
1441         }
1442     }
1443
1444   reloc->howto = bfd_reloc_type_lookup (stdoutput, code);
1445
1446   if (reloc->howto == NULL)
1447     {
1448       as_bad_where (fixp->fx_file, fixp->fx_line,
1449                     _("Can not represent %s relocation in this object file format"),
1450                     bfd_get_reloc_code_name (code));
1451       return NULL;
1452     }
1453
1454   return reloc;
1455 }
1456
1457 void
1458 pseudo_bss (int c ATTRIBUTE_UNUSED)
1459 {
1460   int temp;
1461
1462   temp = get_absolute_expression ();
1463   subseg_set (bss_section, temp);
1464   demand_empty_rest_of_line ();
1465 }
1466
1467 void
1468 pseudo_even (int c ATTRIBUTE_UNUSED)
1469 {
1470   int alignment = 1; /* 2^1 */
1471   frag_align (alignment, 0, 1);
1472   record_alignment (now_seg, alignment);
1473 }
1474
1475 const char *
1476 md_atof (int type, char * litP, int * sizeP)
1477 {
1478   return vax_md_atof (type, litP, sizeP);
1479 }