gas/config/tc-pdp11.c

   1 /* tc-pdp11.c - pdp11-specific -
   2    Copyright 2001, 2002, 2004, 2005, 2007, 2009
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GAS, the GNU Assembler.
   6
   7    GAS is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3, or (at your option)
  10    any later version.
  11
  12    GAS is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with GAS; see the file COPYING.  If not, write to
  19    the Free Software Foundation, 51 Franklin Street - Fifth Floor,
  20    Boston, MA 02110-1301, USA.  */
  21
  22 #include "as.h"
  23 #include "safe-ctype.h"
  24 #include "opcode/pdp11.h"
  25
  26 extern int flonum_gen2vax (int, FLONUM_TYPE * f, LITTLENUM_TYPE *);
  27
  28 #define TRUE  1
  29 #define FALSE 0
  30
  31 /* A representation for PDP-11 machine code.  */
  32 struct pdp11_code
  33 {
  34   char *error;
  35   int code;
  36   int additional;       /* Is there an additional word?  */
  37   int word;             /* Additional word, if any.  */
  38   struct
  39   {
  40     bfd_reloc_code_real_type type;
  41     expressionS exp;
  42     int pc_rel;
  43   } reloc;
  44 };
  45
  46 /* Instruction set extensions.
  47
  48    If you change this from an array to something else, please update
  49    the "PDP-11 instruction set extensions" comment in pdp11.h.  */
  50 int pdp11_extension[PDP11_EXT_NUM];
  51
  52 /* Assembly options.  */
  53
  54 #define ASM_OPT_PIC 1
  55 #define ASM_OPT_NUM 2
  56
  57 int asm_option[ASM_OPT_NUM];
  58
  59 /* These chars start a comment anywhere in a source file (except inside
  60    another comment.  */
  61 const char comment_chars[] = "#/";
  62
  63 /* These chars only start a comment at the beginning of a line.  */
  64 const char line_comment_chars[] = "#/";
  65
  66 const char line_separator_chars[] = ";";
  67
  68 /* Chars that can be used to separate mant from exp in floating point nums.  */
  69 const char EXP_CHARS[] = "eE";
  70
  71 /* Chars that mean this number is a floating point constant.  */
  72 /* as in 0f123.456.  */
  73 /* or    0H1.234E-12 (see exp chars above).  */
  74 const char FLT_CHARS[] = "dDfF";
  75
  76 void pseudo_even (int);
  77 void pseudo_bss (int);
  78
  79 const pseudo_typeS md_pseudo_table[] =
  80 {
  81   { "bss", pseudo_bss, 0 },
  82   { "even", pseudo_even, 0 },
  83   { 0, 0, 0 },
  84 };
  85
  86 static struct hash_control *insn_hash = NULL;
  87 \f
  88 static int
  89 set_option (char *arg)
  90 {
  91   int yes = 1;
  92
  93   if (strcmp (arg, "all-extensions") == 0
  94       || strcmp (arg, "all") == 0)
  95     {
  96       memset (pdp11_extension, ~0, sizeof pdp11_extension);
  97       pdp11_extension[PDP11_NONE] = 0;
  98       return 1;
  99     }
 100   else if (strcmp (arg, "no-extensions") == 0)
 101     {
 102       memset (pdp11_extension, 0, sizeof pdp11_extension);
 103       pdp11_extension[PDP11_BASIC] = 1;
 104       return 1;
 105     }
 106
 107   if (strncmp (arg, "no-", 3) == 0)
 108     {
 109       yes = 0;
 110       arg += 3;
 111     }
 112
 113   /* Commersial instructions.  */
 114   if (strcmp (arg, "cis") == 0)
 115     pdp11_extension[PDP11_CIS] = yes;
 116   /* Call supervisor mode.  */
 117   else if (strcmp (arg, "csm") == 0)
 118     pdp11_extension[PDP11_CSM] = yes;
 119   /* Extended instruction set.  */
 120   else if (strcmp (arg, "eis") == 0)
 121     pdp11_extension[PDP11_EIS] = pdp11_extension[PDP11_LEIS] = yes;
 122   /* KEV11 floating-point.  */
 123   else if (strcmp (arg, "fis") == 0
 124            || strcmp (arg, "kev11") == 0
 125            || strcmp (arg, "kev-11") == 0)
 126     pdp11_extension[PDP11_FIS] = yes;
 127   /* FP-11 floating-point.  */
 128   else if (strcmp (arg, "fpp") == 0
 129            || strcmp (arg, "fpu") == 0
 130            || strcmp (arg, "fp11") == 0
 131            || strcmp (arg, "fp-11") == 0
 132            || strcmp (arg, "fpj11") == 0
 133            || strcmp (arg, "fp-j11") == 0
 134            || strcmp (arg, "fpj-11") == 0)
 135     pdp11_extension[PDP11_FPP] = yes;
 136   /* Limited extended insns.  */
 137   else if (strcmp (arg, "limited-eis") == 0)
 138     {
 139       pdp11_extension[PDP11_LEIS] = yes;
 140       if (!pdp11_extension[PDP11_LEIS])
 141         pdp11_extension[PDP11_EIS] = 0;
 142     }
 143   /* Move from processor type.  */
 144   else if (strcmp (arg, "mfpt") == 0)
 145     pdp11_extension[PDP11_MFPT] = yes;
 146   /* Multiprocessor insns:  */
 147   else if (strncmp (arg, "mproc", 5) == 0
 148            /* TSTSET, WRTLCK */
 149            || strncmp (arg, "multiproc", 9) == 0)
 150     pdp11_extension[PDP11_MPROC] = yes;
 151   /* Move from/to proc status.  */
 152   else if (strcmp (arg, "mxps") == 0)
 153     pdp11_extension[PDP11_MXPS] = yes;
 154   /* Position-independent code.  */
 155   else if (strcmp (arg, "pic") == 0)
 156     asm_option[ASM_OPT_PIC] = yes;
 157   /* Set priority level.  */
 158   else if (strcmp (arg, "spl") == 0)
 159     pdp11_extension[PDP11_SPL] = yes;
 160   /* Microcode instructions:  */
 161   else if (strcmp (arg, "ucode") == 0
 162            /* LDUB, MED, XFC */
 163            || strcmp (arg, "microcode") == 0)
 164     pdp11_extension[PDP11_UCODE] = yes;
 165   else
 166     return 0;
 167
 168   return 1;
 169 }
 170
 171
 172 static void
 173 init_defaults (void)
 174 {
 175   static int first = 1;
 176
 177   if (first)
 178     {
 179       set_option ("all-extensions");
 180       set_option ("pic");
 181       first = 0;
 182     }
 183 }
 184
 185 void
 186 md_begin (void)
 187 {
 188   int i;
 189
 190   init_defaults ();
 191
 192   insn_hash = hash_new ();
 193   if (insn_hash == NULL)
 194     as_fatal ("Virtual memory exhausted");
 195
 196   for (i = 0; i < pdp11_num_opcodes; i++)
 197     hash_insert (insn_hash, pdp11_opcodes[i].name, (void *) (pdp11_opcodes + i));
 198   for (i = 0; i < pdp11_num_aliases; i++)
 199     hash_insert (insn_hash, pdp11_aliases[i].name, (void *) (pdp11_aliases + i));
 200 }
 201
 202 void
 203 md_number_to_chars (char con[], valueT value, int nbytes)
 204 {
 205   /* On a PDP-11, 0x1234 is stored as "\x12\x34", and
 206      0x12345678 is stored as "\x56\x78\x12\x34". It's
 207      anyones guess what 0x123456 would be stored like.  */
 208
 209   switch (nbytes)
 210     {
 211     case 0:
 212       break;
 213     case 1:
 214       con[0] =  value       & 0xff;
 215       break;
 216     case 2:
 217       con[0] =  value        & 0xff;
 218       con[1] = (value >>  8) & 0xff;
 219       break;
 220     case 4:
 221       con[0] = (value >> 16) & 0xff;
 222       con[1] = (value >> 24) & 0xff;
 223       con[2] =  value        & 0xff;
 224       con[3] = (value >>  8) & 0xff;
 225       break;
 226     default:
 227       BAD_CASE (nbytes);
 228     }
 229 }
 230
 231 /* Fix up some data or instructions after we find out the value of a symbol
 232    that they reference.  Knows about order of bytes in address.  */
 233
 234 void
 235 md_apply_fix (fixS *fixP,
 236                valueT * valP,
 237                segT seg ATTRIBUTE_UNUSED)
 238 {
 239   valueT code;
 240   valueT mask;
 241   valueT val = * valP;
 242   char *buf;
 243   int shift;
 244   int size;
 245
 246   buf = fixP->fx_where + fixP->fx_frag->fr_literal;
 247   size = fixP->fx_size;
 248   code = md_chars_to_number ((unsigned char *) buf, size);
 249
 250   switch (fixP->fx_r_type)
 251     {
 252     case BFD_RELOC_16:
 253     case BFD_RELOC_16_PCREL:
 254       mask = 0xffff;
 255       shift = 0;
 256       break;
 257     case BFD_RELOC_PDP11_DISP_8_PCREL:
 258       mask = 0x00ff;
 259       shift = 1;
 260       break;
 261     case BFD_RELOC_PDP11_DISP_6_PCREL:
 262       mask = 0x003f;
 263       shift = 1;
 264       val = -val;
 265       break;
 266     default:
 267       BAD_CASE (fixP->fx_r_type);
 268     }
 269
 270   if (fixP->fx_addsy != NULL)
 271     val += symbol_get_bfdsym (fixP->fx_addsy)->section->vma;
 272     /* *value += fixP->fx_addsy->bsym->section->vma; */
 273
 274   code &= ~mask;
 275   code |= (val >> shift) & mask;
 276   number_to_chars_littleendian (buf, code, size);
 277
 278   if (fixP->fx_addsy == NULL && fixP->fx_pcrel == 0)
 279     fixP->fx_done = 1;
 280 }
 281
 282 long
 283 md_chars_to_number (con, nbytes)
 284      unsigned char con[];       /* Low order byte 1st.  */
 285      int nbytes;                /* Number of bytes in the input.  */
 286 {
 287   /* On a PDP-11, 0x1234 is stored as "\x12\x34", and
 288      0x12345678 is stored as "\x56\x78\x12\x34". It's
 289      anyones guess what 0x123456 would be stored like.  */
 290   switch (nbytes)
 291     {
 292     case 0:
 293       return 0;
 294     case 1:
 295       return con[0];
 296     case 2:
 297       return (con[1] << BITS_PER_CHAR) | con[0];
 298     case 4:
 299       return
 300         (((con[1] << BITS_PER_CHAR) | con[0]) << (2 * BITS_PER_CHAR))
 301         |((con[3] << BITS_PER_CHAR) | con[2]);
 302     default:
 303       BAD_CASE (nbytes);
 304       return 0;
 305     }
 306 }
 307 \f
 308 static char *
 309 skip_whitespace (char *str)
 310 {
 311   while (*str == ' ' || *str == '\t')
 312     str++;
 313   return str;
 314 }
 315
 316 static char *
 317 find_whitespace (char *str)
 318 {
 319   while (*str != ' ' && *str != '\t' && *str != 0)
 320     str++;
 321   return str;
 322 }
 323
 324 static char *
 325 parse_reg (char *str, struct pdp11_code *operand)
 326 {
 327   str = skip_whitespace (str);
 328   if (TOLOWER (*str) == 'r')
 329     {
 330       str++;
 331       switch (*str)
 332         {
 333         case '0': case '1': case '2': case '3':
 334         case '4': case '5': case '6': case '7':
 335           operand->code = *str - '0';
 336           str++;
 337           break;
 338         default:
 339           operand->error = "Bad register name";
 340           return str - 1;
 341         }
 342     }
 343   else if (strncmp (str, "sp", 2) == 0
 344            || strncmp (str, "SP", 2) == 0)
 345     {
 346       operand->code = 6;
 347       str += 2;
 348     }
 349   else if (strncmp (str, "pc", 2) == 0
 350            || strncmp (str, "PC", 2) == 0)
 351     {
 352       operand->code = 7;
 353       str += 2;
 354     }
 355   else
 356     {
 357       operand->error = "Bad register name";
 358       return str;
 359     }
 360
 361   return str;
 362 }
 363
 364 static char *
 365 parse_ac5 (char *str, struct pdp11_code *operand)
 366 {
 367   str = skip_whitespace (str);
 368   if (strncmp (str, "fr", 2) == 0
 369       || strncmp (str, "FR", 2) == 0
 370       || strncmp (str, "ac", 2) == 0
 371       || strncmp (str, "AC", 2) == 0)
 372     {
 373       str += 2;
 374       switch (*str)
 375         {
 376         case '0': case '1': case '2': case '3':
 377         case '4': case '5':
 378           operand->code = *str - '0';
 379           str++;
 380           break;
 381         default:
 382           operand->error = "Bad register name";
 383           return str - 2;
 384         }
 385     }
 386   else
 387     {
 388       operand->error = "Bad register name";
 389       return str;
 390     }
 391
 392   return str;
 393 }
 394
 395 static char *
 396 parse_ac (char *str, struct pdp11_code *operand)
 397 {
 398   str = parse_ac5 (str, operand);
 399   if (!operand->error && operand->code > 3)
 400     {
 401           operand->error = "Bad register name";
 402           return str - 3;
 403     }
 404
 405   return str;
 406 }
 407
 408 static char *
 409 parse_expression (char *str, struct pdp11_code *operand)
 410 {
 411   char *save_input_line_pointer;
 412   segT seg;
 413
 414   save_input_line_pointer = input_line_pointer;
 415   input_line_pointer = str;
 416   seg = expression (&operand->reloc.exp);
 417   if (seg == NULL)
 418     {
 419       input_line_pointer = save_input_line_pointer;
 420       operand->error = "Error in expression";
 421       return str;
 422     }
 423
 424   str = input_line_pointer;
 425   input_line_pointer = save_input_line_pointer;
 426
 427   operand->reloc.pc_rel = 0;
 428
 429   return str;
 430 }
 431
 432 static char *
 433 parse_op_no_deferred (char *str, struct pdp11_code *operand)
 434 {
 435   LITTLENUM_TYPE literal_float[2];
 436
 437   str = skip_whitespace (str);
 438
 439   switch (*str)
 440     {
 441     case '(':                           /* (rn) and (rn)+ */
 442       str = parse_reg (str + 1, operand);
 443       if (operand->error)
 444         return str;
 445       str = skip_whitespace (str);
 446       if (*str != ')')
 447         {
 448           operand->error = "Missing ')'";
 449           return str;
 450         }
 451       str++;
 452       if (*str == '+')
 453         {
 454           operand->code |= 020;
 455           str++;
 456         }
 457       else
 458         {
 459           operand->code |= 010;
 460         }
 461       break;
 462
 463       /* Immediate.  */
 464     case '#':
 465     case '$':
 466       str = parse_expression (str + 1, operand);
 467       if (operand->error)
 468         return str;
 469       operand->additional = TRUE;
 470       operand->word = operand->reloc.exp.X_add_number;
 471       switch (operand->reloc.exp.X_op)
 472         {
 473         case O_constant:
 474           break;
 475         case O_symbol:
 476         case O_add:
 477         case O_subtract:
 478           operand->reloc.type = BFD_RELOC_16;
 479           operand->reloc.pc_rel = 0;
 480           break;
 481         case O_big:
 482           if (operand->reloc.exp.X_add_number > 0)
 483             {
 484               operand->error = "Error in expression";
 485               break;
 486             }
 487           /* It's a floating literal...  */
 488           know (operand->reloc.exp.X_add_number < 0);
 489           flonum_gen2vax ('f', &generic_floating_point_number, literal_float);
 490           operand->word = literal_float[0];
 491           if (literal_float[1] != 0)
 492             as_warn (_("Low order bits truncated in immediate float operand"));
 493           break;
 494         default:
 495           operand->error = "Error in expression";
 496           break;
 497         }
 498       operand->code = 027;
 499       break;
 500
 501       /* label, d(rn), -(rn)  */
 502     default:
 503       {
 504         char *old = str;
 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             if (operand->reloc.exp.X_op != O_symbol)
 531               {
 532                 operand->error = "Label expected";
 533                 return old;
 534               }
 535             operand->code = 067;
 536             operand->additional = 1;
 537             operand->word = 0;
 538             operand->reloc.type = BFD_RELOC_16_PCREL;
 539             operand->reloc.pc_rel = 1;
 540             break;
 541           }
 542
 543         /* d(rn) */
 544         str++;
 545         str = parse_reg (str, operand);
 546         if (operand->error)
 547           return str;
 548
 549         str = skip_whitespace (str);
 550
 551         if (*str != ')')
 552           {
 553             operand->error = "Missing ')'";
 554             return str;
 555           }
 556
 557         str++;
 558         operand->additional = TRUE;
 559         operand->code |= 060;
 560         switch (operand->reloc.exp.X_op)
 561           {
 562           case O_symbol:
 563             operand->reloc.type = BFD_RELOC_16;
 564             operand->reloc.pc_rel = 0;
 565             break;
 566           case O_constant:
 567             if ((operand->code & 7) == 7)
 568               {
 569                 operand->reloc.pc_rel = 1;
 570                 operand->word = operand->reloc.exp.X_add_number;
 571               }
 572             else
 573               operand->word = operand->reloc.exp.X_add_number;
 574
 575             break;
 576           default:
 577             BAD_CASE (operand->reloc.exp.X_op);
 578           }
 579         break;
 580       }
 581     }
 582
 583   return str;
 584 }
 585
 586 static char *
 587 parse_op_noreg (char *str, struct pdp11_code *operand)
 588 {
 589   str = skip_whitespace (str);
 590   operand->error = NULL;
 591
 592   if (*str == '@' || *str == '*')
 593     {
 594       str = parse_op_no_deferred (str + 1, operand);
 595       if (operand->error)
 596         return str;
 597       operand->code |= 010;
 598     }
 599   else
 600     str = parse_op_no_deferred (str, operand);
 601
 602   return str;
 603 }
 604
 605 static char *
 606 parse_op (char *str, struct pdp11_code *operand)
 607 {
 608   str = skip_whitespace (str);
 609
 610   str = parse_reg (str, operand);
 611   if (!operand->error)
 612     return str;
 613
 614   operand->error = NULL;
 615   parse_ac5 (str, operand);
 616   if (!operand->error)
 617     {
 618       operand->error = "Float AC not legal as integer operand";
 619       return str;
 620     }
 621
 622   return parse_op_noreg (str, operand);
 623 }
 624
 625 static char *
 626 parse_fop (char *str, struct pdp11_code *operand)
 627 {
 628   str = skip_whitespace (str);
 629
 630   str = parse_ac5 (str, operand);
 631   if (!operand->error)
 632     return str;
 633
 634   operand->error = NULL;
 635   parse_reg (str, operand);
 636   if (!operand->error)
 637     {
 638       operand->error = "General register not legal as float operand";
 639       return str;
 640     }
 641
 642   return parse_op_noreg (str, operand);
 643 }
 644
 645 static char *
 646 parse_separator (char *str, int *error)
 647 {
 648   str = skip_whitespace (str);
 649   *error = (*str != ',');
 650   if (!*error)
 651     str++;
 652   return str;
 653 }
 654
 655 void
 656 md_assemble (char *instruction_string)
 657 {
 658   const struct pdp11_opcode *op;
 659   struct pdp11_code insn, op1, op2;
 660   int error;
 661   int size;
 662   char *err = NULL;
 663   char *str;
 664   char *p;
 665   char c;
 666
 667   str = skip_whitespace (instruction_string);
 668   p = find_whitespace (str);
 669   if (p - str == 0)
 670     {
 671       as_bad ("No instruction found");
 672       return;
 673     }
 674
 675   c = *p;
 676   *p = '\0';
 677   op = (struct pdp11_opcode *)hash_find (insn_hash, str);
 678   *p = c;
 679   if (op == 0)
 680     {
 681       as_bad (_("Unknown instruction '%s'"), str);
 682       return;
 683     }
 684
 685   if (!pdp11_extension[op->extension])
 686     {
 687       as_warn ("Unsupported instruction set extension: %s", op->name);
 688       return;
 689     }
 690
 691   insn.error = NULL;
 692   insn.code = op->opcode;
 693   insn.reloc.type = BFD_RELOC_NONE;
 694   op1.error = NULL;
 695   op1.additional = FALSE;
 696   op1.reloc.type = BFD_RELOC_NONE;
 697   op2.error = NULL;
 698   op2.additional = FALSE;
 699   op2.reloc.type = BFD_RELOC_NONE;
 700
 701   str = p;
 702   size = 2;
 703
 704   switch (op->type)
 705     {
 706     case PDP11_OPCODE_NO_OPS:
 707       str = skip_whitespace (str);
 708       if (*str == 0)
 709         str = "";
 710       break;
 711
 712     case PDP11_OPCODE_IMM3:
 713     case PDP11_OPCODE_IMM6:
 714     case PDP11_OPCODE_IMM8:
 715       str = skip_whitespace (str);
 716       if (*str == '#' || *str == '$')
 717         str++;
 718       str = parse_expression (str, &op1);
 719       if (op1.error)
 720         break;
 721       if (op1.reloc.exp.X_op != O_constant || op1.reloc.type != BFD_RELOC_NONE)
 722         {
 723           op1.error = "operand is not an absolute constant";
 724           break;
 725         }
 726       switch (op->type)
 727         {
 728         case PDP11_OPCODE_IMM3:
 729           if (op1.reloc.exp.X_add_number & ~7)
 730             {
 731               op1.error = "3-bit immediate out of range";
 732               break;
 733             }
 734           break;
 735         case PDP11_OPCODE_IMM6:
 736           if (op1.reloc.exp.X_add_number & ~0x3f)
 737             {
 738               op1.error = "6-bit immediate out of range";
 739               break;
 740             }
 741           break;
 742         case PDP11_OPCODE_IMM8:
 743           if (op1.reloc.exp.X_add_number & ~0xff)
 744             {
 745               op1.error = "8-bit immediate out of range";
 746               break;
 747             }
 748           break;
 749         }
 750       insn.code |= op1.reloc.exp.X_add_number;
 751       break;
 752
 753     case PDP11_OPCODE_DISPL:
 754       {
 755         char *new;
 756         new = parse_expression (str, &op1);
 757         op1.code = 0;
 758         op1.reloc.pc_rel = 1;
 759         op1.reloc.type = BFD_RELOC_PDP11_DISP_8_PCREL;
 760         if (op1.reloc.exp.X_op != O_symbol)
 761           {
 762             op1.error = "Symbol expected";
 763             break;
 764           }
 765         if (op1.code & ~0xff)
 766           {
 767             err = "8-bit displacement out of range";
 768             break;
 769           }
 770         str = new;
 771         insn.code |= op1.code;
 772         insn.reloc = op1.reloc;
 773       }
 774       break;
 775
 776     case PDP11_OPCODE_REG:
 777       str = parse_reg (str, &op1);
 778       if (op1.error)
 779         break;
 780       insn.code |= op1.code;
 781       break;
 782
 783     case PDP11_OPCODE_OP:
 784       str = parse_op (str, &op1);
 785       if (op1.error)
 786         break;
 787       insn.code |= op1.code;
 788       if (op1.additional)
 789         size += 2;
 790       break;
 791
 792     case PDP11_OPCODE_FOP:
 793       str = parse_fop (str, &op1);
 794       if (op1.error)
 795         break;
 796       insn.code |= op1.code;
 797       if (op1.additional)
 798         size += 2;
 799       break;
 800
 801     case PDP11_OPCODE_REG_OP:
 802       str = parse_reg (str, &op2);
 803       if (op2.error)
 804         break;
 805       insn.code |= op2.code << 6;
 806       str = parse_separator (str, &error);
 807       if (error)
 808         {
 809           op2.error = "Missing ','";
 810           break;
 811         }
 812       str = parse_op (str, &op1);
 813       if (op1.error)
 814         break;
 815       insn.code |= op1.code;
 816       if (op1.additional)
 817         size += 2;
 818       break;
 819
 820     case PDP11_OPCODE_REG_OP_REV:
 821       str = parse_op (str, &op1);
 822       if (op1.error)
 823         break;
 824       insn.code |= op1.code;
 825       if (op1.additional)
 826         size += 2;
 827       str = parse_separator (str, &error);
 828       if (error)
 829         {
 830           op2.error = "Missing ','";
 831           break;
 832         }
 833       str = parse_reg (str, &op2);
 834       if (op2.error)
 835         break;
 836       insn.code |= op2.code << 6;
 837       break;
 838
 839     case PDP11_OPCODE_AC_FOP:
 840       str = parse_ac (str, &op2);
 841       if (op2.error)
 842         break;
 843       insn.code |= op2.code << 6;
 844       str = parse_separator (str, &error);
 845       if (error)
 846         {
 847           op1.error = "Missing ','";
 848           break;
 849         }
 850       str = parse_fop (str, &op1);
 851       if (op1.error)
 852         break;
 853       insn.code |= op1.code;
 854       if (op1.additional)
 855         size += 2;
 856       break;
 857
 858     case PDP11_OPCODE_FOP_AC:
 859       str = parse_fop (str, &op1);
 860       if (op1.error)
 861         break;
 862       insn.code |= op1.code;
 863       if (op1.additional)
 864         size += 2;
 865       str = parse_separator (str, &error);
 866       if (error)
 867         {
 868           op1.error = "Missing ','";
 869           break;
 870         }
 871       str = parse_ac (str, &op2);
 872       if (op2.error)
 873         break;
 874       insn.code |= op2.code << 6;
 875       break;
 876
 877     case PDP11_OPCODE_AC_OP:
 878       str = parse_ac (str, &op2);
 879       if (op2.error)
 880         break;
 881       insn.code |= op2.code << 6;
 882       str = parse_separator (str, &error);
 883       if (error)
 884         {
 885           op1.error = "Missing ','";
 886           break;
 887         }
 888       str = parse_op (str, &op1);
 889       if (op1.error)
 890         break;
 891       insn.code |= op1.code;
 892       if (op1.additional)
 893         size += 2;
 894       break;
 895
 896     case PDP11_OPCODE_OP_AC:
 897       str = parse_op (str, &op1);
 898       if (op1.error)
 899         break;
 900       insn.code |= op1.code;
 901       if (op1.additional)
 902         size += 2;
 903       str = parse_separator (str, &error);
 904       if (error)
 905         {
 906           op1.error = "Missing ','";
 907           break;
 908         }
 909       str = parse_ac (str, &op2);
 910       if (op2.error)
 911         break;
 912       insn.code |= op2.code << 6;
 913       break;
 914
 915     case PDP11_OPCODE_OP_OP:
 916       str = parse_op (str, &op1);
 917       if (op1.error)
 918         break;
 919       insn.code |= op1.code << 6;
 920       if (op1.additional)
 921         size += 2;
 922       str = parse_separator (str, &error);
 923       if (error)
 924         {
 925           op2.error = "Missing ','";
 926           break;
 927         }
 928       str = parse_op (str, &op2);
 929       if (op2.error)
 930         break;
 931       insn.code |= op2.code;
 932       if (op2.additional)
 933         size += 2;
 934       break;
 935
 936     case PDP11_OPCODE_REG_DISPL:
 937       {
 938         char *new;
 939         str = parse_reg (str, &op2);
 940         if (op2.error)
 941           break;
 942         insn.code |= op2.code << 6;
 943         str = parse_separator (str, &error);
 944         if (error)
 945           {
 946             op1.error = "Missing ','";
 947             break;
 948           }
 949         new = parse_expression (str, &op1);
 950         op1.code = 0;
 951         op1.reloc.pc_rel = 1;
 952         op1.reloc.type = BFD_RELOC_PDP11_DISP_6_PCREL;
 953         if (op1.reloc.exp.X_op != O_symbol)
 954           {
 955             op1.error = "Symbol expected";
 956             break;
 957           }
 958         if (op1.code & ~0x3f)
 959           {
 960             err = "6-bit displacement out of range";
 961             break;
 962           }
 963         str = new;
 964         insn.code |= op1.code;
 965         insn.reloc = op1.reloc;
 966       }
 967       break;
 968
 969     default:
 970       BAD_CASE (op->type);
 971     }
 972
 973   if (op1.error)
 974     err = op1.error;
 975   else if (op2.error)
 976     err = op2.error;
 977   else
 978     {
 979       str = skip_whitespace (str);
 980       if (*str)
 981         err = "Too many operands";
 982     }
 983
 984   {
 985     char *to = NULL;
 986
 987     if (err)
 988       {
 989         as_bad (err);
 990         return;
 991       }
 992
 993     to = frag_more (size);
 994
 995     md_number_to_chars (to, insn.code, 2);
 996     if (insn.reloc.type != BFD_RELOC_NONE)
 997       fix_new_exp (frag_now, to - frag_now->fr_literal, 2,
 998                    &insn.reloc.exp, insn.reloc.pc_rel, insn.reloc.type);
 999     to += 2;
1000
1001     if (op1.additional)
1002       {
1003         md_number_to_chars (to, op1.word, 2);
1004         if (op1.reloc.type != BFD_RELOC_NONE)
1005           fix_new_exp (frag_now, to - frag_now->fr_literal, 2,
1006                        &op1.reloc.exp, op1.reloc.pc_rel, op1.reloc.type);
1007         to += 2;
1008       }
1009
1010     if (op2.additional)
1011       {
1012         md_number_to_chars (to, op2.word, 2);
1013         if (op2.reloc.type != BFD_RELOC_NONE)
1014           fix_new_exp (frag_now, to - frag_now->fr_literal, 2,
1015                        &op2.reloc.exp, op2.reloc.pc_rel, op2.reloc.type);
1016       }
1017   }
1018 }
1019
1020 int
1021 md_estimate_size_before_relax (fragS *fragP ATTRIBUTE_UNUSED,
1022                                segT segment ATTRIBUTE_UNUSED)
1023 {
1024   return 0;
1025 }
1026
1027 void
1028 md_convert_frag (bfd *headers ATTRIBUTE_UNUSED,
1029                  segT seg ATTRIBUTE_UNUSED,
1030                  fragS *fragP ATTRIBUTE_UNUSED)
1031 {
1032 }
1033
1034 int md_short_jump_size = 2;
1035 int md_long_jump_size = 4;
1036
1037 void
1038 md_create_short_jump (char *ptr ATTRIBUTE_UNUSED,
1039                       addressT from_addr ATTRIBUTE_UNUSED,
1040                       addressT to_addr ATTRIBUTE_UNUSED,
1041                       fragS *frag ATTRIBUTE_UNUSED,
1042                       symbolS *to_symbol ATTRIBUTE_UNUSED)
1043 {
1044 }
1045
1046 void
1047 md_create_long_jump (char *ptr ATTRIBUTE_UNUSED,
1048                      addressT from_addr ATTRIBUTE_UNUSED,
1049                      addressT to_addr ATTRIBUTE_UNUSED,
1050                      fragS *frag ATTRIBUTE_UNUSED,
1051                      symbolS *to_symbol ATTRIBUTE_UNUSED)
1052 {
1053 }
1054
1055 static int
1056 set_cpu_model (char *arg)
1057 {
1058   char buf[4];
1059   char *model = buf;
1060
1061   if (arg[0] == 'k')
1062     arg++;
1063
1064   *model++ = *arg++;
1065
1066   if (strchr ("abdx", model[-1]) == NULL)
1067     return 0;
1068
1069   if (model[-1] == 'd')
1070     {
1071       if (arg[0] == 'f' || arg[0] == 'j')
1072         model[-1] = *arg++;
1073     }
1074   else if (model[-1] == 'x')
1075     {
1076       if (arg[0] == 't')
1077         model[-1] = *arg++;
1078     }
1079
1080   if (arg[0] == '-')
1081     arg++;
1082
1083   if (strncmp (arg, "11", 2) != 0)
1084     return 0;
1085   arg += 2;
1086
1087   if (arg[0] == '-')
1088     {
1089       if (*++arg == 0)
1090         return 0;
1091     }
1092
1093   /* Allow up to two revision letters.  */
1094   if (arg[0] != 0)
1095     *model++ = *arg++;
1096   if (arg[0] != 0)
1097     *model++ = *arg++;
1098
1099   *model++ = 0;
1100
1101   set_option ("no-extensions");
1102
1103   /* KA11 (11/15/20).  */
1104   if (strncmp (buf, "a", 1) == 0)
1105     return 1; /* No extensions.  */
1106
1107   /* KB11 (11/45/50/55/70).  */
1108   else if (strncmp (buf, "b", 1) == 0)
1109     return set_option ("eis") && set_option ("spl");
1110
1111   /* KD11-A (11/35/40).  */
1112   else if (strncmp (buf, "da", 2) == 0)
1113     return set_option ("limited-eis");
1114
1115   /* KD11-B (11/05/10).  */
1116   else if (strncmp (buf, "db", 2) == 0
1117            /* KD11-D (11/04).  */
1118            || strncmp (buf, "dd", 2) == 0)
1119     return 1; /* no extensions */
1120
1121   /* KD11-E (11/34).  */
1122   else if (strncmp (buf, "de", 2) == 0)
1123     return set_option ("eis") && set_option ("mxps");
1124
1125   /* KD11-F (11/03).  */
1126   else if (strncmp (buf, "df", 2) == 0
1127            /* KD11-H (11/03).  */
1128            || strncmp (buf, "dh", 2) == 0
1129            /* KD11-Q (11/03).  */
1130            || strncmp (buf, "dq", 2) == 0)
1131     return set_option ("limited-eis") && set_option ("mxps");
1132
1133   /* KD11-K (11/60).  */
1134   else if (strncmp (buf, "dk", 2) == 0)
1135     return set_option ("eis")
1136       && set_option ("mxps")
1137       && set_option ("ucode");
1138
1139   /* KD11-Z (11/44).  */
1140   else if (strncmp (buf, "dz", 2) == 0)
1141     return set_option ("csm")
1142       && set_option ("eis")
1143       && set_option ("mfpt")
1144       && set_option ("mxps")
1145       && set_option ("spl");
1146
1147   /* F11 (11/23/24).  */
1148   else if (strncmp (buf, "f", 1) == 0)
1149     return set_option ("eis")
1150       && set_option ("mfpt")
1151       && set_option ("mxps");
1152
1153   /* J11 (11/53/73/83/84/93/94).  */
1154   else if (strncmp (buf, "j", 1) == 0)
1155     return set_option ("csm")
1156       && set_option ("eis")
1157       && set_option ("mfpt")
1158       && set_option ("multiproc")
1159       && set_option ("mxps")
1160       && set_option ("spl");
1161
1162   /* T11 (11/21).  */
1163   else if (strncmp (buf, "t", 1) == 0)
1164     return set_option ("limited-eis")
1165       && set_option ("mxps");
1166
1167   else
1168     return 0;
1169 }
1170
1171 static int
1172 set_machine_model (char *arg)
1173 {
1174   if (strncmp (arg, "pdp-11/", 7) != 0
1175       && strncmp (arg, "pdp11/", 6) != 0
1176       && strncmp (arg, "11/", 3) != 0)
1177     return 0;
1178
1179   if (strncmp (arg, "pdp", 3) == 0)
1180     arg += 3;
1181   if (arg[0] == '-')
1182     arg++;
1183   if (strncmp (arg, "11/", 3) == 0)
1184     arg += 3;
1185
1186   if (strcmp (arg, "03") == 0)
1187     return set_cpu_model ("kd11f");
1188
1189   else if (strcmp (arg, "04") == 0)
1190     return set_cpu_model ("kd11d");
1191
1192   else if (strcmp (arg, "05") == 0
1193            || strcmp (arg, "10") == 0)
1194     return set_cpu_model ("kd11b");
1195
1196   else if (strcmp (arg, "15") == 0
1197            || strcmp (arg, "20") == 0)
1198     return set_cpu_model ("ka11");
1199
1200   else if (strcmp (arg, "21") == 0)
1201     return set_cpu_model ("t11");
1202
1203   else if (strcmp (arg, "23") == 0
1204            || strcmp (arg, "24") == 0)
1205     return set_cpu_model ("f11");
1206
1207   else if (strcmp (arg, "34") == 0
1208            || strcmp (arg, "34a") == 0)
1209     return set_cpu_model ("kd11e");
1210
1211   else if (strcmp (arg, "35") == 0
1212            || strcmp (arg, "40") == 0)
1213     return set_cpu_model ("kd11da");
1214
1215   else if (strcmp (arg, "44") == 0)
1216     return set_cpu_model ("kd11dz");
1217
1218   else if (strcmp (arg, "45") == 0
1219            || strcmp (arg, "50") == 0
1220            || strcmp (arg, "55") == 0
1221            || strcmp (arg, "70") == 0)
1222     return set_cpu_model ("kb11");
1223
1224   else if (strcmp (arg, "60") == 0)
1225     return set_cpu_model ("kd11k");
1226
1227   else if (strcmp (arg, "53") == 0
1228            || strcmp (arg, "73") == 0
1229            || strcmp (arg, "83") == 0
1230            || strcmp (arg, "84") == 0
1231            || strcmp (arg, "93") == 0
1232            || strcmp (arg, "94") == 0)
1233     return set_cpu_model ("j11")
1234       && set_option ("fpp");
1235
1236   else
1237     return 0;
1238 }
1239
1240 const char *md_shortopts = "m:";
1241
1242 struct option md_longopts[] =
1243 {
1244 #define OPTION_CPU 257
1245   { "cpu", required_argument, NULL, OPTION_CPU },
1246 #define OPTION_MACHINE 258
1247   { "machine", required_argument, NULL, OPTION_MACHINE },
1248 #define OPTION_PIC 259
1249   { "pic", no_argument, NULL, OPTION_PIC },
1250   { NULL, no_argument, NULL, 0 }
1251 };
1252
1253 size_t md_longopts_size = sizeof (md_longopts);
1254
1255 /* Invocation line includes a switch not recognized by the base assembler.
1256    See if it's a processor-specific option.  */
1257
1258 int
1259 md_parse_option (int c, char *arg)
1260 {
1261   init_defaults ();
1262
1263   switch (c)
1264     {
1265     case 'm':
1266       if (set_option (arg))
1267         return 1;
1268       if (set_cpu_model (arg))
1269         return 1;
1270       if (set_machine_model (arg))
1271         return 1;
1272       break;
1273
1274     case OPTION_CPU:
1275       if (set_cpu_model (arg))
1276         return 1;
1277       break;
1278
1279     case OPTION_MACHINE:
1280       if (set_machine_model (arg))
1281         return 1;
1282       break;
1283
1284     case OPTION_PIC:
1285       if (set_option ("pic"))
1286         return 1;
1287       break;
1288
1289     default:
1290       break;
1291     }
1292
1293   return 0;
1294 }
1295
1296 void
1297 md_show_usage (FILE *stream)
1298 {
1299   fprintf (stream, "\
1300 \n\
1301 PDP-11 instruction set extentions:\n\
1302 \n\
1303 -m(no-)cis              allow (disallow) commersial instruction set\n\
1304 -m(no-)csm              allow (disallow) CSM instruction\n\
1305 -m(no-)eis              allow (disallow) full extended instruction set\n\
1306 -m(no-)fis              allow (disallow) KEV11 floating-point instructions\n\
1307 -m(no-)fpp              allow (disallow) FP-11 floating-point instructions\n\
1308 -m(no-)fpu              allow (disallow) FP-11 floating-point instructions\n\
1309 -m(no-)limited-eis      allow (disallow) limited extended instruction set\n\
1310 -m(no-)mfpt             allow (disallow) processor type instruction\n\
1311 -m(no-)multiproc        allow (disallow) multiprocessor instructions\n\
1312 -m(no-)mxps             allow (disallow) processor status instructions\n\
1313 -m(no-)spl              allow (disallow) SPL instruction\n\
1314 -m(no-)ucode            allow (disallow) microcode instructions\n\
1315 -mall-extensions        allow all instruction set extensions\n\
1316                         (this is the default)\n\
1317 -mno-extentions         disallow all instruction set extensions\n\
1318 -pic                    generate position-indepenent code\n\
1319 \n\
1320 PDP-11 CPU model options:\n\
1321 \n\
1322 -mka11*                 KA11 CPU.  base line instruction set only\n\
1323 -mkb11*                 KB11 CPU.  enable full EIS and SPL\n\
1324 -mkd11a*                KD11-A CPU.  enable limited EIS\n\
1325 -mkd11b*                KD11-B CPU.  base line instruction set only\n\
1326 -mkd11d*                KD11-D CPU.  base line instruction set only\n\
1327 -mkd11e*                KD11-E CPU.  enable full EIS, MTPS, and MFPS\n\
1328 -mkd11f*                KD11-F CPU.  enable limited EIS, MTPS, and MFPS\n\
1329 -mkd11h*                KD11-H CPU.  enable limited EIS, MTPS, and MFPS\n\
1330 -mkd11q*                KD11-Q CPU.  enable limited EIS, MTPS, and MFPS\n\
1331 -mkd11k*                KD11-K CPU.  enable full EIS, MTPS, MFPS, LDUB, MED,\n\
1332                         XFC, and MFPT\n\
1333 -mkd11z*                KD11-Z CPU.  enable full EIS, MTPS, MFPS, MFPT, SPL,\n\
1334                         and CSM\n\
1335 -mf11*                  F11 CPU.  enable full EIS, MFPS, MTPS, and MFPT\n\
1336 -mj11*                  J11 CPU.  enable full EIS, MTPS, MFPS, MFPT, SPL,\n\
1337                         CSM, TSTSET, and WRTLCK\n\
1338 -mt11*                  T11 CPU.  enable limited EIS, MTPS, and MFPS\n\
1339 \n\
1340 PDP-11 machine model options:\n\
1341 \n\
1342 -m11/03                 same as -mkd11f\n\
1343 -m11/04                 same as -mkd11d\n\
1344 -m11/05                 same as -mkd11b\n\
1345 -m11/10                 same as -mkd11b\n\
1346 -m11/15                 same as -mka11\n\
1347 -m11/20                 same as -mka11\n\
1348 -m11/21                 same as -mt11\n\
1349 -m11/23                 same as -mf11\n\
1350 -m11/24                 same as -mf11\n\
1351 -m11/34                 same as -mkd11e\n\
1352 -m11/34a                same as -mkd11e -mfpp\n\
1353 -m11/35                 same as -mkd11a\n\
1354 -m11/40                 same as -mkd11a\n\
1355 -m11/44                 same as -mkd11z\n\
1356 -m11/45                 same as -mkb11\n\
1357 -m11/50                 same as -mkb11\n\
1358 -m11/53                 same as -mj11\n\
1359 -m11/55                 same as -mkb11\n\
1360 -m11/60                 same as -mkd11k\n\
1361 -m11/70                 same as -mkb11\n\
1362 -m11/73                 same as -mj11\n\
1363 -m11/83                 same as -mj11\n\
1364 -m11/84                 same as -mj11\n\
1365 -m11/93                 same as -mj11\n\
1366 -m11/94                 same as -mj11\n\
1367 ");
1368 }
1369
1370 symbolS *
1371 md_undefined_symbol (char *name ATTRIBUTE_UNUSED)
1372 {
1373   return 0;
1374 }
1375
1376 valueT
1377 md_section_align (segT segment ATTRIBUTE_UNUSED,
1378                   valueT size)
1379 {
1380   return (size + 1) & ~1;
1381 }
1382
1383 long
1384 md_pcrel_from (fixS *fixP)
1385 {
1386   return fixP->fx_frag->fr_address + fixP->fx_where + fixP->fx_size;
1387 }
1388
1389 /* Translate internal representation of relocation info to BFD target
1390    format.  */
1391
1392 arelent *
1393 tc_gen_reloc (asection *section ATTRIBUTE_UNUSED,
1394               fixS *fixp)
1395 {
1396   arelent *reloc;
1397   bfd_reloc_code_real_type code;
1398
1399   reloc = xmalloc (sizeof (* reloc));
1400
1401   reloc->sym_ptr_ptr = xmalloc (sizeof (asymbol *));
1402   *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
1403   reloc->address = fixp->fx_frag->fr_address + fixp->fx_where;
1404
1405   /* This is taken account for in md_apply_fix().  */
1406   reloc->addend = -symbol_get_bfdsym (fixp->fx_addsy)->section->vma;
1407
1408   switch (fixp->fx_r_type)
1409     {
1410     case BFD_RELOC_16:
1411       if (fixp->fx_pcrel)
1412         code = BFD_RELOC_16_PCREL;
1413       else
1414         code = BFD_RELOC_16;
1415       break;
1416
1417     case BFD_RELOC_16_PCREL:
1418       code = BFD_RELOC_16_PCREL;
1419       break;
1420
1421     default:
1422       BAD_CASE (fixp->fx_r_type);
1423       return NULL;
1424     }
1425
1426   reloc->howto = bfd_reloc_type_lookup (stdoutput, code);
1427
1428   if (reloc->howto == NULL)
1429     {
1430       as_bad_where (fixp->fx_file, fixp->fx_line,
1431                     "Can not represent %s relocation in this object file format",
1432                     bfd_get_reloc_code_name (code));
1433       return NULL;
1434     }
1435
1436   return reloc;
1437 }
1438
1439 void
1440 pseudo_bss (int c ATTRIBUTE_UNUSED)
1441 {
1442   int temp;
1443
1444   temp = get_absolute_expression ();
1445   subseg_set (bss_section, temp);
1446   demand_empty_rest_of_line ();
1447 }
1448
1449 void
1450 pseudo_even (int c ATTRIBUTE_UNUSED)
1451 {
1452   int alignment = 1; /* 2^1 */
1453   frag_align (alignment, 0, 1);
1454   record_alignment (now_seg, alignment);
1455 }
1456
1457 char *
1458 md_atof (int type, char * litP, int * sizeP)
1459 {
1460   return vax_md_atof (type, litP, sizeP);
1461 }