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_PDP11_DISP_8_PCREL:
 261       mask = 0x00ff;
 262       shift = 1;
 263       break;
 264     case BFD_RELOC_PDP11_DISP_6_PCREL:
 265       mask = 0x003f;
 266       shift = 1;
 267       val = -val;
 268       break;
 269     default:
 270       BAD_CASE (fixP->fx_r_type);
 271     }
 272
 273   if (fixP->fx_addsy != NULL)
 274     val += symbol_get_bfdsym (fixP->fx_addsy)->section->vma;
 275     /* *value += fixP->fx_addsy->bsym->section->vma; */
 276
 277   code &= ~mask;
 278   code |= (val >> shift) & mask;
 279   number_to_chars_littleendian (buf, code, size);
 280
 281   if (fixP->fx_addsy == NULL && fixP->fx_pcrel == 0)
 282     fixP->fx_done = 1;
 283 }
 284
 285 long
 286 md_chars_to_number (unsigned char *con, int nbytes)
 287 {
 288   /* On a PDP-11, 0x1234 is stored as "\x12\x34", and
 289      0x12345678 is stored as "\x56\x78\x12\x34". It's
 290      anyone's guess what 0x123456 would be stored like.  */
 291   switch (nbytes)
 292     {
 293     case 0:
 294       return 0;
 295     case 1:
 296       return con[0];
 297     case 2:
 298       return (con[1] << BITS_PER_CHAR) | con[0];
 299     case 4:
 300       return
 301         (((con[1] << BITS_PER_CHAR) | con[0]) << (2 * BITS_PER_CHAR))
 302         |((con[3] << BITS_PER_CHAR) | con[2]);
 303     default:
 304       BAD_CASE (nbytes);
 305       return 0;
 306     }
 307 }
 308 \f
 309 static char *
 310 skip_whitespace (char *str)
 311 {
 312   while (*str == ' ' || *str == '\t')
 313     str++;
 314   return str;
 315 }
 316
 317 static char *
 318 find_whitespace (char *str)
 319 {
 320   while (*str != ' ' && *str != '\t' && *str != 0)
 321     str++;
 322   return str;
 323 }
 324
 325 static char *
 326 parse_reg (char *str, struct pdp11_code *operand)
 327 {
 328   str = skip_whitespace (str);
 329   if (TOLOWER (*str) == 'r')
 330     {
 331       str++;
 332       switch (*str)
 333         {
 334         case '0': case '1': case '2': case '3':
 335         case '4': case '5': case '6': case '7':
 336           operand->code = *str - '0';
 337           str++;
 338           break;
 339         default:
 340           operand->error = _("Bad register name");
 341           return str - 1;
 342         }
 343     }
 344   else if (strncmp (str, "sp", 2) == 0
 345            || strncmp (str, "SP", 2) == 0)
 346     {
 347       operand->code = 6;
 348       str += 2;
 349     }
 350   else if (strncmp (str, "pc", 2) == 0
 351            || strncmp (str, "PC", 2) == 0)
 352     {
 353       operand->code = 7;
 354       str += 2;
 355     }
 356   else
 357     operand->error = _("Bad register name");
 358
 359   return str;
 360 }
 361
 362 static char *
 363 parse_ac5 (char *str, struct pdp11_code *operand)
 364 {
 365   str = skip_whitespace (str);
 366   if (strncmp (str, "fr", 2) == 0
 367       || strncmp (str, "FR", 2) == 0
 368       || strncmp (str, "ac", 2) == 0
 369       || strncmp (str, "AC", 2) == 0)
 370     {
 371       str += 2;
 372       switch (*str)
 373         {
 374         case '0': case '1': case '2': case '3':
 375         case '4': case '5':
 376           operand->code = *str - '0';
 377           str++;
 378           break;
 379         default:
 380           operand->error = _("Bad register name");
 381           return str - 2;
 382         }
 383     }
 384   else
 385     {
 386       operand->error = _("Bad register name");
 387       return str;
 388     }
 389
 390   return str;
 391 }
 392
 393 static char *
 394 parse_ac (char *str, struct pdp11_code *operand)
 395 {
 396   str = parse_ac5 (str, operand);
 397   if (!operand->error && operand->code > 3)
 398     {
 399       operand->error = _("Bad register name");
 400           return str - 3;
 401     }
 402
 403   return str;
 404 }
 405
 406 static char *
 407 parse_expression (char *str, struct pdp11_code *operand)
 408 {
 409   char *save_input_line_pointer;
 410   segT seg;
 411
 412   save_input_line_pointer = input_line_pointer;
 413   input_line_pointer = str;
 414   seg = expression (&operand->reloc.exp);
 415   if (seg == NULL)
 416     {
 417       input_line_pointer = save_input_line_pointer;
 418       operand->error = _("Error in expression");
 419       return str;
 420     }
 421
 422   str = input_line_pointer;
 423   input_line_pointer = save_input_line_pointer;
 424
 425   operand->reloc.pc_rel = 0;
 426
 427   return str;
 428 }
 429
 430 static char *
 431 parse_op_no_deferred (char *str, struct pdp11_code *operand)
 432 {
 433   LITTLENUM_TYPE literal_float[2];
 434
 435   str = skip_whitespace (str);
 436
 437   switch (*str)
 438     {
 439     case '(':                           /* (rn) and (rn)+ */
 440       str = parse_reg (str + 1, operand);
 441       if (operand->error)
 442         return str;
 443       str = skip_whitespace (str);
 444       if (*str != ')')
 445         {
 446           operand->error = _("Missing ')'");
 447           return str;
 448         }
 449       str++;
 450       if (*str == '+')
 451         {
 452           operand->code |= 020;
 453           str++;
 454         }
 455       else
 456         {
 457           operand->code |= 010;
 458         }
 459       break;
 460
 461       /* Immediate.  */
 462     case '#':
 463     case '$':
 464       str = parse_expression (str + 1, operand);
 465       if (operand->error)
 466         return str;
 467       operand->additional = TRUE;
 468       operand->word = operand->reloc.exp.X_add_number;
 469       switch (operand->reloc.exp.X_op)
 470         {
 471         case O_constant:
 472           break;
 473         case O_symbol:
 474         case O_add:
 475         case O_subtract:
 476           operand->reloc.type = BFD_RELOC_16;
 477           operand->reloc.pc_rel = 0;
 478           break;
 479         case O_big:
 480           if (operand->reloc.exp.X_add_number > 0)
 481             {
 482               operand->error = _("Error in expression");
 483               break;
 484             }
 485           /* It's a floating literal...  */
 486           know (operand->reloc.exp.X_add_number < 0);
 487           flonum_gen2vax ('f', &generic_floating_point_number, literal_float);
 488           operand->word = literal_float[0];
 489           if (literal_float[1] != 0)
 490             as_warn (_("Low order bits truncated in immediate float operand"));
 491           break;
 492         default:
 493           operand->error = _("Error in expression");
 494           break;
 495         }
 496       operand->code = 027;
 497       break;
 498
 499       /* label, d(rn), -(rn)  */
 500     default:
 501       {
 502         if (strncmp (str, "-(", 2) == 0)        /* -(rn) */
 503           {
 504             str = parse_reg (str + 2, operand);
 505             if (operand->error)
 506               return str;
 507             str = skip_whitespace (str);
 508             if (*str != ')')
 509               {
 510                 operand->error = _("Missing ')'");
 511                 return str;
 512               }
 513             operand->code |= 040;
 514             str++;
 515             break;
 516           }
 517
 518         str = parse_expression (str, operand);
 519         if (operand->error)
 520           return str;
 521
 522         str = skip_whitespace (str);
 523
 524         if (*str != '(')
 525           {
 526             operand->code = 067;
 527             operand->additional = 1;
 528             operand->word = 0;
 529             operand->reloc.type = BFD_RELOC_16_PCREL;
 530             operand->reloc.pc_rel = 1;
 531             break;
 532           }
 533
 534         /* d(rn) */
 535         str++;
 536         str = parse_reg (str, operand);
 537         if (operand->error)
 538           return str;
 539
 540         str = skip_whitespace (str);
 541
 542         if (*str != ')')
 543           {
 544             operand->error = _("Missing ')'");
 545             return str;
 546           }
 547
 548         str++;
 549         operand->additional = TRUE;
 550         operand->code |= 060;
 551         switch (operand->reloc.exp.X_op)
 552           {
 553           case O_symbol:
 554             operand->reloc.type = BFD_RELOC_16;
 555             operand->reloc.pc_rel = 0;
 556             break;
 557           case O_constant:
 558             if ((operand->code & 7) == 7)
 559               {
 560                 operand->reloc.pc_rel = 1;
 561                 operand->word = operand->reloc.exp.X_add_number;
 562               }
 563             else
 564               operand->word = operand->reloc.exp.X_add_number;
 565
 566             break;
 567           default:
 568             BAD_CASE (operand->reloc.exp.X_op);
 569           }
 570         break;
 571       }
 572     }
 573
 574   return str;
 575 }
 576
 577 static char *
 578 parse_op_noreg (char *str, struct pdp11_code *operand)
 579 {
 580   str = skip_whitespace (str);
 581   operand->error = NULL;
 582
 583   if (*str == '@' || *str == '*')
 584     {
 585       /* @(Rn) == @0(Rn): Mode 7, Indexed deferred.
 586          Check for auto-increment deferred.  */
 587       if (str[1] == '('
 588           && str[2] != 0
 589           && str[3] != 0
 590           && str[4] != 0
 591           && str[5] != '+')
 592         {
 593           /* Change implied to explicit index deferred.  */
 594           *str = '0';
 595           str = parse_op_no_deferred (str, operand);
 596         }
 597       else
 598         {
 599           /* @Rn == (Rn): Register deferred.  */
 600           str = parse_reg (str + 1, operand);
 601
 602           /* Not @Rn */
 603           if (operand->error)
 604             {
 605               operand->error = NULL;
 606               str = parse_op_no_deferred (str, operand);
 607             }
 608         }
 609
 610       if (operand->error)
 611         return str;
 612
 613       operand->code |= 010;
 614     }
 615   else
 616     str = parse_op_no_deferred (str, operand);
 617
 618   return str;
 619 }
 620
 621 static char *
 622 parse_op (char *str, struct pdp11_code *operand)
 623 {
 624   str = skip_whitespace (str);
 625
 626   str = parse_reg (str, operand);
 627   if (!operand->error)
 628     return str;
 629
 630   operand->error = NULL;
 631   parse_ac5 (str, operand);
 632   if (!operand->error)
 633     {
 634       operand->error = _("Float AC not legal as integer operand");
 635       return str;
 636     }
 637
 638   return parse_op_noreg (str, operand);
 639 }
 640
 641 static char *
 642 parse_fop (char *str, struct pdp11_code *operand)
 643 {
 644   str = skip_whitespace (str);
 645
 646   str = parse_ac5 (str, operand);
 647   if (!operand->error)
 648     return str;
 649
 650   operand->error = NULL;
 651   parse_reg (str, operand);
 652   if (!operand->error)
 653     {
 654       operand->error = _("General register not legal as float operand");
 655       return str;
 656     }
 657
 658   return parse_op_noreg (str, operand);
 659 }
 660
 661 static char *
 662 parse_separator (char *str, int *error)
 663 {
 664   str = skip_whitespace (str);
 665   *error = (*str != ',');
 666   if (!*error)
 667     str++;
 668   return str;
 669 }
 670
 671 void
 672 md_assemble (char *instruction_string)
 673 {
 674   const struct pdp11_opcode *op;
 675   struct pdp11_code insn, op1, op2;
 676   int error;
 677   int size;
 678   const char *err = NULL;
 679   char *str;
 680   char *p;
 681   char c;
 682
 683   str = skip_whitespace (instruction_string);
 684   p = find_whitespace (str);
 685   if (p - str == 0)
 686     {
 687       as_bad (_("No instruction found"));
 688       return;
 689     }
 690
 691   c = *p;
 692   *p = '\0';
 693   op = (struct pdp11_opcode *)hash_find (insn_hash, str);
 694   *p = c;
 695   if (op == 0)
 696     {
 697       as_bad (_("Unknown instruction '%s'"), str);
 698       return;
 699     }
 700
 701   if (!pdp11_extension[op->extension])
 702     {
 703       as_warn (_("Unsupported instruction set extension: %s"), op->name);
 704       return;
 705     }
 706
 707   insn.error = NULL;
 708   insn.code = op->opcode;
 709   insn.reloc.type = BFD_RELOC_NONE;
 710   op1.error = NULL;
 711   op1.additional = FALSE;
 712   op1.reloc.type = BFD_RELOC_NONE;
 713   op2.error = NULL;
 714   op2.additional = FALSE;
 715   op2.reloc.type = BFD_RELOC_NONE;
 716
 717   str = p;
 718   size = 2;
 719
 720   switch (op->type)
 721     {
 722     case PDP11_OPCODE_NO_OPS:
 723       str = skip_whitespace (str);
 724       break;
 725
 726     case PDP11_OPCODE_IMM3:
 727     case PDP11_OPCODE_IMM6:
 728     case PDP11_OPCODE_IMM8:
 729       str = skip_whitespace (str);
 730       if (*str == '#' || *str == '$')
 731         str++;
 732       str = parse_expression (str, &op1);
 733       if (op1.error)
 734         break;
 735       if (op1.reloc.exp.X_op != O_constant || op1.reloc.type != BFD_RELOC_NONE)
 736         {
 737           op1.error = _("operand is not an absolute constant");
 738           break;
 739         }
 740       switch (op->type)
 741         {
 742         case PDP11_OPCODE_IMM3:
 743           if (op1.reloc.exp.X_add_number & ~7)
 744             {
 745               op1.error = _("3-bit immediate out of range");
 746               break;
 747             }
 748           break;
 749         case PDP11_OPCODE_IMM6:
 750           if (op1.reloc.exp.X_add_number & ~0x3f)
 751             {
 752               op1.error = _("6-bit immediate out of range");
 753               break;
 754             }
 755           break;
 756         case PDP11_OPCODE_IMM8:
 757           if (op1.reloc.exp.X_add_number & ~0xff)
 758             {
 759               op1.error = _("8-bit immediate out of range");
 760               break;
 761             }
 762           break;
 763         }
 764       insn.code |= op1.reloc.exp.X_add_number;
 765       break;
 766
 767     case PDP11_OPCODE_DISPL:
 768       {
 769         char *new_pointer;
 770         new_pointer = parse_expression (str, &op1);
 771         op1.code = 0;
 772         op1.reloc.pc_rel = 1;
 773         op1.reloc.type = BFD_RELOC_PDP11_DISP_8_PCREL;
 774         if (op1.reloc.exp.X_op != O_symbol)
 775           {
 776             op1.error = _("Symbol expected");
 777             break;
 778           }
 779         if (op1.code & ~0xff)
 780           {
 781             err = _("8-bit displacement out of range");
 782             break;
 783           }
 784         str = new_pointer;
 785         insn.code |= op1.code;
 786         insn.reloc = op1.reloc;
 787       }
 788       break;
 789
 790     case PDP11_OPCODE_REG:
 791       str = parse_reg (str, &op1);
 792       if (op1.error)
 793         break;
 794       insn.code |= op1.code;
 795       break;
 796
 797     case PDP11_OPCODE_OP:
 798       str = parse_op (str, &op1);
 799       if (op1.error)
 800         break;
 801       insn.code |= op1.code;
 802       if (op1.additional)
 803         size += 2;
 804       break;
 805
 806     case PDP11_OPCODE_FOP:
 807       str = parse_fop (str, &op1);
 808       if (op1.error)
 809         break;
 810       insn.code |= op1.code;
 811       if (op1.additional)
 812         size += 2;
 813       break;
 814
 815     case PDP11_OPCODE_REG_OP:
 816       str = parse_reg (str, &op2);
 817       if (op2.error)
 818         break;
 819       insn.code |= op2.code << 6;
 820       str = parse_separator (str, &error);
 821       if (error)
 822         {
 823           op2.error = _("Missing ','");
 824           break;
 825         }
 826       str = parse_op (str, &op1);
 827       if (op1.error)
 828         break;
 829       insn.code |= op1.code;
 830       if (op1.additional)
 831         size += 2;
 832       break;
 833
 834     case PDP11_OPCODE_REG_OP_REV:
 835       str = parse_op (str, &op1);
 836       if (op1.error)
 837         break;
 838       insn.code |= op1.code;
 839       if (op1.additional)
 840         size += 2;
 841       str = parse_separator (str, &error);
 842       if (error)
 843         {
 844           op2.error = _("Missing ','");
 845           break;
 846         }
 847       str = parse_reg (str, &op2);
 848       if (op2.error)
 849         break;
 850       insn.code |= op2.code << 6;
 851       break;
 852
 853     case PDP11_OPCODE_AC_FOP:
 854       str = parse_ac (str, &op2);
 855       if (op2.error)
 856         break;
 857       insn.code |= op2.code << 6;
 858       str = parse_separator (str, &error);
 859       if (error)
 860         {
 861           op1.error = _("Missing ','");
 862           break;
 863         }
 864       str = parse_fop (str, &op1);
 865       if (op1.error)
 866         break;
 867       insn.code |= op1.code;
 868       if (op1.additional)
 869         size += 2;
 870       break;
 871
 872     case PDP11_OPCODE_FOP_AC:
 873       str = parse_fop (str, &op1);
 874       if (op1.error)
 875         break;
 876       insn.code |= op1.code;
 877       if (op1.additional)
 878         size += 2;
 879       str = parse_separator (str, &error);
 880       if (error)
 881         {
 882           op1.error = _("Missing ','");
 883           break;
 884         }
 885       str = parse_ac (str, &op2);
 886       if (op2.error)
 887         break;
 888       insn.code |= op2.code << 6;
 889       break;
 890
 891     case PDP11_OPCODE_AC_OP:
 892       str = parse_ac (str, &op2);
 893       if (op2.error)
 894         break;
 895       insn.code |= op2.code << 6;
 896       str = parse_separator (str, &error);
 897       if (error)
 898         {
 899           op1.error = _("Missing ','");
 900           break;
 901         }
 902       str = parse_op (str, &op1);
 903       if (op1.error)
 904         break;
 905       insn.code |= op1.code;
 906       if (op1.additional)
 907         size += 2;
 908       break;
 909
 910     case PDP11_OPCODE_OP_AC:
 911       str = parse_op (str, &op1);
 912       if (op1.error)
 913         break;
 914       insn.code |= op1.code;
 915       if (op1.additional)
 916         size += 2;
 917       str = parse_separator (str, &error);
 918       if (error)
 919         {
 920           op1.error = _("Missing ','");
 921           break;
 922         }
 923       str = parse_ac (str, &op2);
 924       if (op2.error)
 925         break;
 926       insn.code |= op2.code << 6;
 927       break;
 928
 929     case PDP11_OPCODE_OP_OP:
 930       str = parse_op (str, &op1);
 931       if (op1.error)
 932         break;
 933       insn.code |= op1.code << 6;
 934       if (op1.additional)
 935         size += 2;
 936       str = parse_separator (str, &error);
 937       if (error)
 938         {
 939           op2.error = _("Missing ','");
 940           break;
 941         }
 942       str = parse_op (str, &op2);
 943       if (op2.error)
 944         break;
 945       insn.code |= op2.code;
 946       if (op2.additional)
 947         size += 2;
 948       break;
 949
 950     case PDP11_OPCODE_REG_DISPL:
 951       {
 952         char *new_pointer;
 953         str = parse_reg (str, &op2);
 954         if (op2.error)
 955           break;
 956         insn.code |= op2.code << 6;
 957         str = parse_separator (str, &error);
 958         if (error)
 959           {
 960             op1.error = _("Missing ','");
 961             break;
 962           }
 963         new_pointer = parse_expression (str, &op1);
 964         op1.code = 0;
 965         op1.reloc.pc_rel = 1;
 966         op1.reloc.type = BFD_RELOC_PDP11_DISP_6_PCREL;
 967         if (op1.reloc.exp.X_op != O_symbol)
 968           {
 969             op1.error = _("Symbol expected");
 970             break;
 971           }
 972         if (op1.code & ~0x3f)
 973           {
 974             err = _("6-bit displacement out of range");
 975             break;
 976           }
 977         str = new_pointer;
 978         insn.code |= op1.code;
 979         insn.reloc = op1.reloc;
 980       }
 981       break;
 982
 983     default:
 984       BAD_CASE (op->type);
 985     }
 986
 987   if (op1.error)
 988     err = op1.error;
 989   else if (op2.error)
 990     err = op2.error;
 991   else
 992     {
 993       str = skip_whitespace (str);
 994       if (*str)
 995         err = _("Too many operands");
 996     }
 997
 998   {
 999     char *to = NULL;
1000
1001     if (err)
1002       {
1003         as_bad ("%s", err);
1004         return;
1005       }
1006
1007     to = frag_more (size);
1008
1009     md_number_to_chars (to, insn.code, 2);
1010     if (insn.reloc.type != BFD_RELOC_NONE)
1011       fix_new_exp (frag_now, to - frag_now->fr_literal, 2,
1012                    &insn.reloc.exp, insn.reloc.pc_rel, insn.reloc.type);
1013     to += 2;
1014
1015     if (op1.additional)
1016       {
1017         md_number_to_chars (to, op1.word, 2);
1018         if (op1.reloc.type != BFD_RELOC_NONE)
1019           fix_new_exp (frag_now, to - frag_now->fr_literal, 2,
1020                        &op1.reloc.exp, op1.reloc.pc_rel, op1.reloc.type);
1021         to += 2;
1022       }
1023
1024     if (op2.additional)
1025       {
1026         md_number_to_chars (to, op2.word, 2);
1027         if (op2.reloc.type != BFD_RELOC_NONE)
1028           fix_new_exp (frag_now, to - frag_now->fr_literal, 2,
1029                        &op2.reloc.exp, op2.reloc.pc_rel, op2.reloc.type);
1030       }
1031   }
1032 }
1033
1034 int
1035 md_estimate_size_before_relax (fragS *fragP ATTRIBUTE_UNUSED,
1036                                segT segment ATTRIBUTE_UNUSED)
1037 {
1038   return 0;
1039 }
1040
1041 void
1042 md_convert_frag (bfd *headers ATTRIBUTE_UNUSED,
1043                  segT seg ATTRIBUTE_UNUSED,
1044                  fragS *fragP ATTRIBUTE_UNUSED)
1045 {
1046 }
1047
1048 int md_short_jump_size = 2;
1049 int md_long_jump_size = 4;
1050
1051 void
1052 md_create_short_jump (char *ptr ATTRIBUTE_UNUSED,
1053                       addressT from_addr ATTRIBUTE_UNUSED,
1054                       addressT to_addr ATTRIBUTE_UNUSED,
1055                       fragS *frag ATTRIBUTE_UNUSED,
1056                       symbolS *to_symbol ATTRIBUTE_UNUSED)
1057 {
1058 }
1059
1060 void
1061 md_create_long_jump (char *ptr ATTRIBUTE_UNUSED,
1062                      addressT from_addr ATTRIBUTE_UNUSED,
1063                      addressT to_addr ATTRIBUTE_UNUSED,
1064                      fragS *frag ATTRIBUTE_UNUSED,
1065                      symbolS *to_symbol ATTRIBUTE_UNUSED)
1066 {
1067 }
1068
1069 static int
1070 set_cpu_model (const char *arg)
1071 {
1072   char buf[4];
1073   char *model = buf;
1074
1075   if (arg[0] == 'k')
1076     arg++;
1077
1078   *model++ = *arg++;
1079
1080   if (strchr ("abdx", model[-1]) == NULL)
1081     return 0;
1082
1083   if (model[-1] == 'd')
1084     {
1085       if (arg[0] == 'f' || arg[0] == 'j')
1086         model[-1] = *arg++;
1087     }
1088   else if (model[-1] == 'x')
1089     {
1090       if (arg[0] == 't')
1091         model[-1] = *arg++;
1092     }
1093
1094   if (arg[0] == '-')
1095     arg++;
1096
1097   if (strncmp (arg, "11", 2) != 0)
1098     return 0;
1099   arg += 2;
1100
1101   if (arg[0] == '-')
1102     {
1103       if (*++arg == 0)
1104         return 0;
1105     }
1106
1107   /* Allow up to two revision letters.  */
1108   if (arg[0] != 0)
1109     *model++ = *arg++;
1110   if (arg[0] != 0)
1111     *model++ = *arg++;
1112
1113   *model++ = 0;
1114
1115   set_option ("no-extensions");
1116
1117   /* KA11 (11/15/20).  */
1118   if (strncmp (buf, "a", 1) == 0)
1119     return 1; /* No extensions.  */
1120
1121   /* KB11 (11/45/50/55/70).  */
1122   else if (strncmp (buf, "b", 1) == 0)
1123     return set_option ("eis") && set_option ("spl");
1124
1125   /* KD11-A (11/35/40).  */
1126   else if (strncmp (buf, "da", 2) == 0)
1127     return set_option ("limited-eis");
1128
1129   /* KD11-B (11/05/10).  */
1130   else if (strncmp (buf, "db", 2) == 0
1131            /* KD11-D (11/04).  */
1132            || strncmp (buf, "dd", 2) == 0)
1133     return 1; /* no extensions */
1134
1135   /* KD11-E (11/34).  */
1136   else if (strncmp (buf, "de", 2) == 0)
1137     return set_option ("eis") && set_option ("mxps");
1138
1139   /* KD11-F (11/03).  */
1140   else if (strncmp (buf, "df", 2) == 0
1141            /* KD11-H (11/03).  */
1142            || strncmp (buf, "dh", 2) == 0
1143            /* KD11-Q (11/03).  */
1144            || strncmp (buf, "dq", 2) == 0)
1145     return set_option ("limited-eis") && set_option ("mxps");
1146
1147   /* KD11-K (11/60).  */
1148   else if (strncmp (buf, "dk", 2) == 0)
1149     return set_option ("eis")
1150       && set_option ("mxps")
1151       && set_option ("ucode");
1152
1153   /* KD11-Z (11/44).  */
1154   else if (strncmp (buf, "dz", 2) == 0)
1155     return set_option ("csm")
1156       && set_option ("eis")
1157       && set_option ("mfpt")
1158       && set_option ("mxps")
1159       && set_option ("spl");
1160
1161   /* F11 (11/23/24).  */
1162   else if (strncmp (buf, "f", 1) == 0)
1163     return set_option ("eis")
1164       && set_option ("mfpt")
1165       && set_option ("mxps");
1166
1167   /* J11 (11/53/73/83/84/93/94).  */
1168   else if (strncmp (buf, "j", 1) == 0)
1169     return set_option ("csm")
1170       && set_option ("eis")
1171       && set_option ("mfpt")
1172       && set_option ("multiproc")
1173       && set_option ("mxps")
1174       && set_option ("spl");
1175
1176   /* T11 (11/21).  */
1177   else if (strncmp (buf, "t", 1) == 0)
1178     return set_option ("limited-eis")
1179       && set_option ("mxps");
1180
1181   else
1182     return 0;
1183 }
1184
1185 static int
1186 set_machine_model (const char *arg)
1187 {
1188   if (strncmp (arg, "pdp-11/", 7) != 0
1189       && strncmp (arg, "pdp11/", 6) != 0
1190       && strncmp (arg, "11/", 3) != 0)
1191     return 0;
1192
1193   if (strncmp (arg, "pdp", 3) == 0)
1194     arg += 3;
1195   if (arg[0] == '-')
1196     arg++;
1197   if (strncmp (arg, "11/", 3) == 0)
1198     arg += 3;
1199
1200   if (strcmp (arg, "03") == 0)
1201     return set_cpu_model ("kd11f");
1202
1203   else if (strcmp (arg, "04") == 0)
1204     return set_cpu_model ("kd11d");
1205
1206   else if (strcmp (arg, "05") == 0
1207            || strcmp (arg, "10") == 0)
1208     return set_cpu_model ("kd11b");
1209
1210   else if (strcmp (arg, "15") == 0
1211            || strcmp (arg, "20") == 0)
1212     return set_cpu_model ("ka11");
1213
1214   else if (strcmp (arg, "21") == 0)
1215     return set_cpu_model ("t11");
1216
1217   else if (strcmp (arg, "23") == 0
1218            || strcmp (arg, "24") == 0)
1219     return set_cpu_model ("f11");
1220
1221   else if (strcmp (arg, "34") == 0
1222            || strcmp (arg, "34a") == 0)
1223     return set_cpu_model ("kd11e");
1224
1225   else if (strcmp (arg, "35") == 0
1226            || strcmp (arg, "40") == 0)
1227     return set_cpu_model ("kd11da");
1228
1229   else if (strcmp (arg, "44") == 0)
1230     return set_cpu_model ("kd11dz");
1231
1232   else if (strcmp (arg, "45") == 0
1233            || strcmp (arg, "50") == 0
1234            || strcmp (arg, "55") == 0
1235            || strcmp (arg, "70") == 0)
1236     return set_cpu_model ("kb11");
1237
1238   else if (strcmp (arg, "60") == 0)
1239     return set_cpu_model ("kd11k");
1240
1241   else if (strcmp (arg, "53") == 0
1242            || strcmp (arg, "73") == 0
1243            || strcmp (arg, "83") == 0
1244            || strcmp (arg, "84") == 0
1245            || strcmp (arg, "93") == 0
1246            || strcmp (arg, "94") == 0)
1247     return set_cpu_model ("j11")
1248       && set_option ("fpp");
1249
1250   else
1251     return 0;
1252 }
1253
1254 const char *md_shortopts = "m:";
1255
1256 struct option md_longopts[] =
1257 {
1258 #define OPTION_CPU 257
1259   { "cpu", required_argument, NULL, OPTION_CPU },
1260 #define OPTION_MACHINE 258
1261   { "machine", required_argument, NULL, OPTION_MACHINE },
1262 #define OPTION_PIC 259
1263   { "pic", no_argument, NULL, OPTION_PIC },
1264   { NULL, no_argument, NULL, 0 }
1265 };
1266
1267 size_t md_longopts_size = sizeof (md_longopts);
1268
1269 /* Invocation line includes a switch not recognized by the base assembler.
1270    See if it's a processor-specific option.  */
1271
1272 int
1273 md_parse_option (int c, const char *arg)
1274 {
1275   init_defaults ();
1276
1277   switch (c)
1278     {
1279     case 'm':
1280       if (set_option (arg))
1281         return 1;
1282       if (set_cpu_model (arg))
1283         return 1;
1284       if (set_machine_model (arg))
1285         return 1;
1286       break;
1287
1288     case OPTION_CPU:
1289       if (set_cpu_model (arg))
1290         return 1;
1291       break;
1292
1293     case OPTION_MACHINE:
1294       if (set_machine_model (arg))
1295         return 1;
1296       break;
1297
1298     case OPTION_PIC:
1299       if (set_option ("pic"))
1300         return 1;
1301       break;
1302
1303     default:
1304       break;
1305     }
1306
1307   return 0;
1308 }
1309
1310 void
1311 md_show_usage (FILE *stream)
1312 {
1313   fprintf (stream, "\
1314 \n\
1315 PDP-11 instruction set extensions:\n\
1316 \n\
1317 -m(no-)cis              allow (disallow) commercial instruction set\n\
1318 -m(no-)csm              allow (disallow) CSM instruction\n\
1319 -m(no-)eis              allow (disallow) full extended instruction set\n\
1320 -m(no-)fis              allow (disallow) KEV11 floating-point instructions\n\
1321 -m(no-)fpp              allow (disallow) FP-11 floating-point instructions\n\
1322 -m(no-)fpu              allow (disallow) FP-11 floating-point instructions\n\
1323 -m(no-)limited-eis      allow (disallow) limited extended instruction set\n\
1324 -m(no-)mfpt             allow (disallow) processor type instruction\n\
1325 -m(no-)multiproc        allow (disallow) multiprocessor instructions\n\
1326 -m(no-)mxps             allow (disallow) processor status instructions\n\
1327 -m(no-)spl              allow (disallow) SPL instruction\n\
1328 -m(no-)ucode            allow (disallow) microcode instructions\n\
1329 -mall-extensions        allow all instruction set extensions\n\
1330                         (this is the default)\n\
1331 -mno-extensions         disallow all instruction set extensions\n\
1332 -pic                    generate position-independent code\n\
1333 \n\
1334 PDP-11 CPU model options:\n\
1335 \n\
1336 -mka11*                 KA11 CPU.  base line instruction set only\n\
1337 -mkb11*                 KB11 CPU.  enable full EIS and SPL\n\
1338 -mkd11a*                KD11-A CPU.  enable limited EIS\n\
1339 -mkd11b*                KD11-B CPU.  base line instruction set only\n\
1340 -mkd11d*                KD11-D CPU.  base line instruction set only\n\
1341 -mkd11e*                KD11-E CPU.  enable full EIS, MTPS, and MFPS\n\
1342 -mkd11f*                KD11-F CPU.  enable limited EIS, MTPS, and MFPS\n\
1343 -mkd11h*                KD11-H CPU.  enable limited EIS, MTPS, and MFPS\n\
1344 -mkd11q*                KD11-Q CPU.  enable limited EIS, MTPS, and MFPS\n\
1345 -mkd11k*                KD11-K CPU.  enable full EIS, MTPS, MFPS, LDUB, MED,\n\
1346                         XFC, and MFPT\n\
1347 -mkd11z*                KD11-Z CPU.  enable full EIS, MTPS, MFPS, MFPT, SPL,\n\
1348                         and CSM\n\
1349 -mf11*                  F11 CPU.  enable full EIS, MFPS, MTPS, and MFPT\n\
1350 -mj11*                  J11 CPU.  enable full EIS, MTPS, MFPS, MFPT, SPL,\n\
1351                         CSM, TSTSET, and WRTLCK\n\
1352 -mt11*                  T11 CPU.  enable limited EIS, MTPS, and MFPS\n\
1353 \n\
1354 PDP-11 machine model options:\n\
1355 \n\
1356 -m11/03                 same as -mkd11f\n\
1357 -m11/04                 same as -mkd11d\n\
1358 -m11/05                 same as -mkd11b\n\
1359 -m11/10                 same as -mkd11b\n\
1360 -m11/15                 same as -mka11\n\
1361 -m11/20                 same as -mka11\n\
1362 -m11/21                 same as -mt11\n\
1363 -m11/23                 same as -mf11\n\
1364 -m11/24                 same as -mf11\n\
1365 -m11/34                 same as -mkd11e\n\
1366 -m11/34a                same as -mkd11e -mfpp\n\
1367 -m11/35                 same as -mkd11a\n\
1368 -m11/40                 same as -mkd11a\n\
1369 -m11/44                 same as -mkd11z\n\
1370 -m11/45                 same as -mkb11\n\
1371 -m11/50                 same as -mkb11\n\
1372 -m11/53                 same as -mj11\n\
1373 -m11/55                 same as -mkb11\n\
1374 -m11/60                 same as -mkd11k\n\
1375 -m11/70                 same as -mkb11\n\
1376 -m11/73                 same as -mj11\n\
1377 -m11/83                 same as -mj11\n\
1378 -m11/84                 same as -mj11\n\
1379 -m11/93                 same as -mj11\n\
1380 -m11/94                 same as -mj11\n\
1381 ");
1382 }
1383
1384 symbolS *
1385 md_undefined_symbol (char *name ATTRIBUTE_UNUSED)
1386 {
1387   return 0;
1388 }
1389
1390 valueT
1391 md_section_align (segT segment ATTRIBUTE_UNUSED,
1392                   valueT size)
1393 {
1394   return (size + 1) & ~1;
1395 }
1396
1397 long
1398 md_pcrel_from (fixS *fixP)
1399 {
1400   return fixP->fx_frag->fr_address + fixP->fx_where + fixP->fx_size;
1401 }
1402
1403 /* Translate internal representation of relocation info to BFD target
1404    format.  */
1405
1406 arelent *
1407 tc_gen_reloc (asection *section ATTRIBUTE_UNUSED,
1408               fixS *fixp)
1409 {
1410   arelent *reloc;
1411   bfd_reloc_code_real_type code;
1412
1413   reloc = XNEW (arelent);
1414
1415   reloc->sym_ptr_ptr = XNEW (asymbol *);
1416   *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
1417   reloc->address = fixp->fx_frag->fr_address + fixp->fx_where;
1418
1419   /* This is taken account for in md_apply_fix().  */
1420   reloc->addend = -symbol_get_bfdsym (fixp->fx_addsy)->section->vma;
1421
1422   switch (fixp->fx_r_type)
1423     {
1424     case BFD_RELOC_16:
1425       if (fixp->fx_pcrel)
1426         code = BFD_RELOC_16_PCREL;
1427       else
1428         code = BFD_RELOC_16;
1429       break;
1430
1431     case BFD_RELOC_16_PCREL:
1432       code = BFD_RELOC_16_PCREL;
1433       break;
1434
1435     default:
1436       BAD_CASE (fixp->fx_r_type);
1437       return NULL;
1438     }
1439
1440   reloc->howto = bfd_reloc_type_lookup (stdoutput, code);
1441
1442   if (reloc->howto == NULL)
1443     {
1444       as_bad_where (fixp->fx_file, fixp->fx_line,
1445                     _("Can not represent %s relocation in this object file format"),
1446                     bfd_get_reloc_code_name (code));
1447       return NULL;
1448     }
1449
1450   return reloc;
1451 }
1452
1453 void
1454 pseudo_bss (int c ATTRIBUTE_UNUSED)
1455 {
1456   int temp;
1457
1458   temp = get_absolute_expression ();
1459   subseg_set (bss_section, temp);
1460   demand_empty_rest_of_line ();
1461 }
1462
1463 void
1464 pseudo_even (int c ATTRIBUTE_UNUSED)
1465 {
1466   int alignment = 1; /* 2^1 */
1467   frag_align (alignment, 0, 1);
1468   record_alignment (now_seg, alignment);
1469 }
1470
1471 const char *
1472 md_atof (int type, char * litP, int * sizeP)
1473 {
1474   return vax_md_atof (type, litP, sizeP);
1475 }