gas/config/tc-pdp11.c

   1 /* tc-pdp11.c - pdp11-specific -
   2    Copyright 2001, 2002, 2004, 2005 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 2, 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, Boston, MA 02110-1301, USA.  */
  19
  20 #include "as.h"
  21 #include "safe-ctype.h"
  22 #include "opcode/pdp11.h"
  23
  24 extern int flonum_gen2vax (int, FLONUM_TYPE * f, LITTLENUM_TYPE *);
  25
  26 #define TRUE  1
  27 #define FALSE 0
  28
  29 /* A representation for PDP-11 machine code.  */
  30 struct pdp11_code
  31 {
  32   char *error;
  33   int code;
  34   int additional;       /* Is there an additional word?  */
  35   int word;             /* Additional word, if any.  */
  36   struct
  37   {
  38     bfd_reloc_code_real_type type;
  39     expressionS exp;
  40     int pc_rel;
  41   } reloc;
  42 };
  43
  44 /* Instruction set extensions.
  45
  46    If you change this from an array to something else, please update
  47    the "PDP-11 instruction set extensions" comment in pdp11.h.  */
  48 int pdp11_extension[PDP11_EXT_NUM];
  49
  50 /* Assembly options.  */
  51
  52 #define ASM_OPT_PIC 1
  53 #define ASM_OPT_NUM 2
  54
  55 int asm_option[ASM_OPT_NUM];
  56
  57 /* These chars start a comment anywhere in a source file (except inside
  58    another comment.  */
  59 const char comment_chars[] = "#/";
  60
  61 /* These chars only start a comment at the beginning of a line.  */
  62 const char line_comment_chars[] = "#/";
  63
  64 const char line_separator_chars[] = ";";
  65
  66 /* Chars that can be used to separate mant from exp in floating point nums.  */
  67 const char EXP_CHARS[] = "eE";
  68
  69 /* Chars that mean this number is a floating point constant.  */
  70 /* as in 0f123.456.  */
  71 /* or    0H1.234E-12 (see exp chars above).  */
  72 const char FLT_CHARS[] = "dDfF";
  73
  74 void pseudo_even (int);
  75 void pseudo_bss (int);
  76
  77 const pseudo_typeS md_pseudo_table[] =
  78 {
  79   { "bss", pseudo_bss, 0 },
  80   { "even", pseudo_even, 0 },
  81   { 0, 0, 0 },
  82 };
  83
  84 static struct hash_control *insn_hash = NULL;
  85 \f
  86 static int
  87 set_option (char *arg)
  88 {
  89   int yes = 1;
  90
  91   if (strcmp (arg, "all-extensions") == 0
  92       || strcmp (arg, "all") == 0)
  93     {
  94       memset (pdp11_extension, ~0, sizeof pdp11_extension);
  95       pdp11_extension[PDP11_NONE] = 0;
  96       return 1;
  97     }
  98   else if (strcmp (arg, "no-extensions") == 0)
  99     {
 100       memset (pdp11_extension, 0, sizeof pdp11_extension);
 101       pdp11_extension[PDP11_BASIC] = 1;
 102       return 1;
 103     }
 104
 105   if (strncmp (arg, "no-", 3) == 0)
 106     {
 107       yes = 0;
 108       arg += 3;
 109     }
 110
 111   /* Commersial instructions.  */
 112   if (strcmp (arg, "cis") == 0)
 113     pdp11_extension[PDP11_CIS] = yes;
 114   /* Call supervisor mode.  */
 115   else if (strcmp (arg, "csm") == 0)
 116     pdp11_extension[PDP11_CSM] = yes;
 117   /* Extended instruction set.  */
 118   else if (strcmp (arg, "eis") == 0)
 119     pdp11_extension[PDP11_EIS] = pdp11_extension[PDP11_LEIS] = yes;
 120   /* KEV11 floating-point.  */
 121   else if (strcmp (arg, "fis") == 0
 122            || strcmp (arg, "kev11") == 0
 123            || strcmp (arg, "kev-11") == 0)
 124     pdp11_extension[PDP11_FIS] = yes;
 125   /* FP-11 floating-point.  */
 126   else if (strcmp (arg, "fpp") == 0
 127            || strcmp (arg, "fpu") == 0
 128            || strcmp (arg, "fp11") == 0
 129            || strcmp (arg, "fp-11") == 0
 130            || strcmp (arg, "fpj11") == 0
 131            || strcmp (arg, "fp-j11") == 0
 132            || strcmp (arg, "fpj-11") == 0)
 133     pdp11_extension[PDP11_FPP] = yes;
 134   /* Limited extended insns.  */
 135   else if (strcmp (arg, "limited-eis") == 0)
 136     {
 137       pdp11_extension[PDP11_LEIS] = yes;
 138       if (!pdp11_extension[PDP11_LEIS])
 139         pdp11_extension[PDP11_EIS] = 0;
 140     }
 141   /* Move from processor type.  */
 142   else if (strcmp (arg, "mfpt") == 0)
 143     pdp11_extension[PDP11_MFPT] = yes;
 144   /* Multiprocessor insns:  */
 145   else if (strncmp (arg, "mproc", 5) == 0
 146            /* TSTSET, WRTLCK */
 147            || strncmp (arg, "multiproc", 9) == 0)
 148     pdp11_extension[PDP11_MPROC] = yes;
 149   /* Move from/to proc status.  */
 150   else if (strcmp (arg, "mxps") == 0)
 151     pdp11_extension[PDP11_MXPS] = yes;
 152   /* Position-independent code.  */
 153   else if (strcmp (arg, "pic") == 0)
 154     asm_option[ASM_OPT_PIC] = yes;
 155   /* Set priority level.  */
 156   else if (strcmp (arg, "spl") == 0)
 157     pdp11_extension[PDP11_SPL] = yes;
 158   /* Microcode instructions:  */
 159   else if (strcmp (arg, "ucode") == 0
 160            /* LDUB, MED, XFC */
 161            || strcmp (arg, "microcode") == 0)
 162     pdp11_extension[PDP11_UCODE] = yes;
 163   else
 164     return 0;
 165
 166   return 1;
 167 }
 168
 169
 170 static void
 171 init_defaults (void)
 172 {
 173   static int first = 1;
 174
 175   if (first)
 176     {
 177       set_option ("all-extensions");
 178       set_option ("pic");
 179       first = 0;
 180     }
 181 }
 182
 183 void
 184 md_begin (void)
 185 {
 186   int i;
 187
 188   init_defaults ();
 189
 190   insn_hash = hash_new ();
 191   if (insn_hash == NULL)
 192     as_fatal ("Virtual memory exhausted");
 193
 194   for (i = 0; i < pdp11_num_opcodes; i++)
 195     hash_insert (insn_hash, pdp11_opcodes[i].name, (void *) (pdp11_opcodes + i));
 196   for (i = 0; i < pdp11_num_aliases; i++)
 197     hash_insert (insn_hash, pdp11_aliases[i].name, (void *) (pdp11_aliases + i));
 198 }
 199
 200 void
 201 md_number_to_chars (char con[], valueT value, int nbytes)
 202 {
 203   /* On a PDP-11, 0x1234 is stored as "\x12\x34", and
 204      0x12345678 is stored as "\x56\x78\x12\x34". It's
 205      anyones guess what 0x123456 would be stored like.  */
 206
 207   switch (nbytes)
 208     {
 209     case 0:
 210       break;
 211     case 1:
 212       con[0] =  value       & 0xff;
 213       break;
 214     case 2:
 215       con[0] =  value        & 0xff;
 216       con[1] = (value >>  8) & 0xff;
 217       break;
 218     case 4:
 219       con[0] = (value >> 16) & 0xff;
 220       con[1] = (value >> 24) & 0xff;
 221       con[2] =  value        & 0xff;
 222       con[3] = (value >>  8) & 0xff;
 223       break;
 224     default:
 225       BAD_CASE (nbytes);
 226     }
 227 }
 228
 229 /* Fix up some data or instructions after we find out the value of a symbol
 230    that they reference.  Knows about order of bytes in address.  */
 231
 232 void
 233 md_apply_fix3 (fixS *fixP,
 234                valueT * valP,
 235                segT seg ATTRIBUTE_UNUSED)
 236 {
 237   valueT code;
 238   valueT mask;
 239   valueT val = * valP;
 240   char *buf;
 241   int shift;
 242   int size;
 243
 244   buf = fixP->fx_where + fixP->fx_frag->fr_literal;
 245   size = fixP->fx_size;
 246   code = md_chars_to_number (buf, size);
 247
 248   switch (fixP->fx_r_type)
 249     {
 250     case BFD_RELOC_16:
 251     case BFD_RELOC_16_PCREL:
 252       mask = 0xffff;
 253       shift = 0;
 254       break;
 255     case BFD_RELOC_PDP11_DISP_8_PCREL:
 256       mask = 0x00ff;
 257       shift = 1;
 258       break;
 259     case BFD_RELOC_PDP11_DISP_6_PCREL:
 260       mask = 0x003f;
 261       shift = 1;
 262       val = -val;
 263       break;
 264     default:
 265       BAD_CASE (fixP->fx_r_type);
 266     }
 267
 268   if (fixP->fx_addsy != NULL)
 269     val += symbol_get_bfdsym (fixP->fx_addsy)->section->vma;
 270     /* *value += fixP->fx_addsy->bsym->section->vma; */
 271
 272   code &= ~mask;
 273   code |= (val >> shift) & mask;
 274   number_to_chars_littleendian (buf, code, size);
 275
 276   if (fixP->fx_addsy == NULL && fixP->fx_pcrel == 0)
 277     fixP->fx_done = 1;
 278 }
 279
 280 long
 281 md_chars_to_number (con, nbytes)
 282      unsigned char con[];       /* Low order byte 1st.  */
 283      int nbytes;                /* Number of bytes in the input.  */
 284 {
 285   /* On a PDP-11, 0x1234 is stored as "\x12\x34", and
 286      0x12345678 is stored as "\x56\x78\x12\x34". It's
 287      anyones guess what 0x123456 would be stored like.  */
 288   switch (nbytes)
 289     {
 290     case 0:
 291       return 0;
 292     case 1:
 293       return con[0];
 294     case 2:
 295       return (con[1] << BITS_PER_CHAR) | con[0];
 296     case 4:
 297       return
 298         (((con[1] << BITS_PER_CHAR) | con[0]) << (2 * BITS_PER_CHAR))
 299         |((con[3] << BITS_PER_CHAR) | con[2]);
 300     default:
 301       BAD_CASE (nbytes);
 302       return 0;
 303     }
 304 }
 305 \f
 306 static char *
 307 skip_whitespace (char *str)
 308 {
 309   while (*str == ' ' || *str == '\t')
 310     str++;
 311   return str;
 312 }
 313
 314 static char *
 315 find_whitespace (char *str)
 316 {
 317   while (*str != ' ' && *str != '\t' && *str != 0)
 318     str++;
 319   return str;
 320 }
 321
 322 static char *
 323 parse_reg (char *str, struct pdp11_code *operand)
 324 {
 325   str = skip_whitespace (str);
 326   if (TOLOWER (*str) == 'r')
 327     {
 328       str++;
 329       switch (*str)
 330         {
 331         case '0': case '1': case '2': case '3':
 332         case '4': case '5': case '6': case '7':
 333           operand->code = *str - '0';
 334           str++;
 335           break;
 336         default:
 337           operand->error = "Bad register name";
 338           return str - 1;
 339         }
 340     }
 341   else if (strncmp (str, "sp", 2) == 0
 342            || strncmp (str, "SP", 2) == 0)
 343     {
 344       operand->code = 6;
 345       str += 2;
 346     }
 347   else if (strncmp (str, "pc", 2) == 0
 348            || strncmp (str, "PC", 2) == 0)
 349     {
 350       operand->code = 7;
 351       str += 2;
 352     }
 353   else
 354     {
 355       operand->error = "Bad register name";
 356       return str;
 357     }
 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         char *old = str;
 503
 504         if (strncmp (str, "-(", 2) == 0)        /* -(rn) */
 505           {
 506             str = parse_reg (str + 2, operand);
 507             if (operand->error)
 508               return str;
 509             str = skip_whitespace (str);
 510             if (*str != ')')
 511               {
 512                 operand->error = "Missing ')'";
 513                 return str;
 514               }
 515             operand->code |= 040;
 516             str++;
 517             break;
 518           }
 519
 520         str = parse_expression (str, operand);
 521         if (operand->error)
 522           return str;
 523
 524         str = skip_whitespace (str);
 525
 526         if (*str != '(')
 527           {
 528             if (operand->reloc.exp.X_op != O_symbol)
 529               {
 530                 operand->error = "Label expected";
 531                 return old;
 532               }
 533             operand->code = 067;
 534             operand->additional = 1;
 535             operand->word = 0;
 536             operand->reloc.type = BFD_RELOC_16_PCREL;
 537             operand->reloc.pc_rel = 1;
 538             break;
 539           }
 540
 541         /* d(rn) */
 542         str++;
 543         str = parse_reg (str, operand);
 544         if (operand->error)
 545           return str;
 546
 547         str = skip_whitespace (str);
 548
 549         if (*str != ')')
 550           {
 551             operand->error = "Missing ')'";
 552             return str;
 553           }
 554
 555         str++;
 556         operand->additional = TRUE;
 557         operand->code |= 060;
 558         switch (operand->reloc.exp.X_op)
 559           {
 560           case O_symbol:
 561             operand->word = 0;
 562             operand->reloc.pc_rel = 1;
 563             break;
 564           case O_constant:
 565             if ((operand->code & 7) == 7)
 566               {
 567                 operand->reloc.pc_rel = 1;
 568                 operand->word = operand->reloc.exp.X_add_number;
 569               }
 570             else
 571               operand->word = operand->reloc.exp.X_add_number;
 572
 573             break;
 574           default:
 575             BAD_CASE (operand->reloc.exp.X_op);
 576           }
 577         break;
 578       }
 579     }
 580
 581   return str;
 582 }
 583
 584 static char *
 585 parse_op_noreg (char *str, struct pdp11_code *operand)
 586 {
 587   str = skip_whitespace (str);
 588   operand->error = NULL;
 589
 590   if (*str == '@' || *str == '*')
 591     {
 592       str = parse_op_no_deferred (str + 1, operand);
 593       if (operand->error)
 594         return str;
 595       operand->code |= 010;
 596     }
 597   else
 598     str = parse_op_no_deferred (str, operand);
 599
 600   return str;
 601 }
 602
 603 static char *
 604 parse_op (char *str, struct pdp11_code *operand)
 605 {
 606   str = skip_whitespace (str);
 607
 608   str = parse_reg (str, operand);
 609   if (!operand->error)
 610     return str;
 611
 612   operand->error = NULL;
 613   parse_ac5 (str, operand);
 614   if (!operand->error)
 615     {
 616       operand->error = "Float AC not legal as integer operand";
 617       return str;
 618     }
 619
 620   return parse_op_noreg (str, operand);
 621 }
 622
 623 static char *
 624 parse_fop (char *str, struct pdp11_code *operand)
 625 {
 626   str = skip_whitespace (str);
 627
 628   str = parse_ac5 (str, operand);
 629   if (!operand->error)
 630     return str;
 631
 632   operand->error = NULL;
 633   parse_reg (str, operand);
 634   if (!operand->error)
 635     {
 636       operand->error = "General register not legal as float operand";
 637       return str;
 638     }
 639
 640   return parse_op_noreg (str, operand);
 641 }
 642
 643 static char *
 644 parse_separator (char *str, int *error)
 645 {
 646   str = skip_whitespace (str);
 647   *error = (*str != ',');
 648   if (!*error)
 649     str++;
 650   return str;
 651 }
 652
 653 void
 654 md_assemble (char *instruction_string)
 655 {
 656   const struct pdp11_opcode *op;
 657   struct pdp11_code insn, op1, op2;
 658   int error;
 659   int size;
 660   char *err = NULL;
 661   char *str;
 662   char *p;
 663   char c;
 664
 665   str = skip_whitespace (instruction_string);
 666   p = find_whitespace (str);
 667   if (p - str == 0)
 668     {
 669       as_bad ("No instruction found");
 670       return;
 671     }
 672
 673   c = *p;
 674   *p = '\0';
 675   op = (struct pdp11_opcode *)hash_find (insn_hash, str);
 676   *p = c;
 677   if (op == 0)
 678     {
 679       as_bad (_("Unknown instruction '%s'"), str);
 680       return;
 681     }
 682
 683   if (!pdp11_extension[op->extension])
 684     {
 685       as_warn ("Unsupported instruction set extension: %s", op->name);
 686       return;
 687     }
 688
 689   insn.error = NULL;
 690   insn.code = op->opcode;
 691   insn.reloc.type = BFD_RELOC_NONE;
 692   op1.error = NULL;
 693   op1.additional = FALSE;
 694   op1.reloc.type = BFD_RELOC_NONE;
 695   op2.error = NULL;
 696   op2.additional = FALSE;
 697   op2.reloc.type = BFD_RELOC_NONE;
 698
 699   str = p;
 700   size = 2;
 701
 702   switch (op->type)
 703     {
 704     case PDP11_OPCODE_NO_OPS:
 705       str = skip_whitespace (str);
 706       if (*str == 0)
 707         str = "";
 708       break;
 709
 710     case PDP11_OPCODE_IMM3:
 711     case PDP11_OPCODE_IMM6:
 712     case PDP11_OPCODE_IMM8:
 713       str = skip_whitespace (str);
 714       if (*str == '#' || *str == '$')
 715         str++;
 716       str = parse_expression (str, &op1);
 717       if (op1.error)
 718         break;
 719       if (op1.reloc.exp.X_op != O_constant || op1.reloc.type != BFD_RELOC_NONE)
 720         {
 721           op1.error = "operand is not an absolute constant";
 722           break;
 723         }
 724       switch (op->type)
 725         {
 726         case PDP11_OPCODE_IMM3:
 727           if (op1.reloc.exp.X_add_number & ~7)
 728             {
 729               op1.error = "3-bit immediate out of range";
 730               break;
 731             }
 732           break;
 733         case PDP11_OPCODE_IMM6:
 734           if (op1.reloc.exp.X_add_number & ~0x3f)
 735             {
 736               op1.error = "6-bit immediate out of range";
 737               break;
 738             }
 739           break;
 740         case PDP11_OPCODE_IMM8:
 741           if (op1.reloc.exp.X_add_number & ~0xff)
 742             {
 743               op1.error = "8-bit immediate out of range";
 744               break;
 745             }
 746           break;
 747         }
 748       insn.code |= op1.reloc.exp.X_add_number;
 749       break;
 750
 751     case PDP11_OPCODE_DISPL:
 752       {
 753         char *new;
 754         new = parse_expression (str, &op1);
 755         op1.code = 0;
 756         op1.reloc.pc_rel = 1;
 757         op1.reloc.type = BFD_RELOC_PDP11_DISP_8_PCREL;
 758         if (op1.reloc.exp.X_op != O_symbol)
 759           {
 760             op1.error = "Symbol expected";
 761             break;
 762           }
 763         if (op1.code & ~0xff)
 764           {
 765             err = "8-bit displacement out of range";
 766             break;
 767           }
 768         str = new;
 769         insn.code |= op1.code;
 770         insn.reloc = op1.reloc;
 771       }
 772       break;
 773
 774     case PDP11_OPCODE_REG:
 775       str = parse_reg (str, &op1);
 776       if (op1.error)
 777         break;
 778       insn.code |= op1.code;
 779       break;
 780
 781     case PDP11_OPCODE_OP:
 782       str = parse_op (str, &op1);
 783       if (op1.error)
 784         break;
 785       insn.code |= op1.code;
 786       if (op1.additional)
 787         size += 2;
 788       break;
 789
 790     case PDP11_OPCODE_FOP:
 791       str = parse_fop (str, &op1);
 792       if (op1.error)
 793         break;
 794       insn.code |= op1.code;
 795       if (op1.additional)
 796         size += 2;
 797       break;
 798
 799     case PDP11_OPCODE_REG_OP:
 800       str = parse_reg (str, &op2);
 801       if (op2.error)
 802         break;
 803       insn.code |= op2.code << 6;
 804       str = parse_separator (str, &error);
 805       if (error)
 806         {
 807           op2.error = "Missing ','";
 808           break;
 809         }
 810       str = parse_op (str, &op1);
 811       if (op1.error)
 812         break;
 813       insn.code |= op1.code;
 814       if (op1.additional)
 815         size += 2;
 816       break;
 817
 818     case PDP11_OPCODE_REG_OP_REV:
 819       str = parse_op (str, &op1);
 820       if (op1.error)
 821         break;
 822       insn.code |= op1.code;
 823       if (op1.additional)
 824         size += 2;
 825       str = parse_separator (str, &error);
 826       if (error)
 827         {
 828           op2.error = "Missing ','";
 829           break;
 830         }
 831       str = parse_reg (str, &op2);
 832       if (op2.error)
 833         break;
 834       insn.code |= op2.code << 6;
 835       break;
 836
 837     case PDP11_OPCODE_AC_FOP:
 838       str = parse_ac (str, &op2);
 839       if (op2.error)
 840         break;
 841       insn.code |= op2.code << 6;
 842       str = parse_separator (str, &error);
 843       if (error)
 844         {
 845           op1.error = "Missing ','";
 846           break;
 847         }
 848       str = parse_fop (str, &op1);
 849       if (op1.error)
 850         break;
 851       insn.code |= op1.code;
 852       if (op1.additional)
 853         size += 2;
 854       break;
 855
 856     case PDP11_OPCODE_FOP_AC:
 857       str = parse_fop (str, &op1);
 858       if (op1.error)
 859         break;
 860       insn.code |= op1.code;
 861       if (op1.additional)
 862         size += 2;
 863       str = parse_separator (str, &error);
 864       if (error)
 865         {
 866           op1.error = "Missing ','";
 867           break;
 868         }
 869       str = parse_ac (str, &op2);
 870       if (op2.error)
 871         break;
 872       insn.code |= op2.code << 6;
 873       break;
 874
 875     case PDP11_OPCODE_AC_OP:
 876       str = parse_ac (str, &op2);
 877       if (op2.error)
 878         break;
 879       insn.code |= op2.code << 6;
 880       str = parse_separator (str, &error);
 881       if (error)
 882         {
 883           op1.error = "Missing ','";
 884           break;
 885         }
 886       str = parse_op (str, &op1);
 887       if (op1.error)
 888         break;
 889       insn.code |= op1.code;
 890       if (op1.additional)
 891         size += 2;
 892       break;
 893
 894     case PDP11_OPCODE_OP_AC:
 895       str = parse_op (str, &op1);
 896       if (op1.error)
 897         break;
 898       insn.code |= op1.code;
 899       if (op1.additional)
 900         size += 2;
 901       str = parse_separator (str, &error);
 902       if (error)
 903         {
 904           op1.error = "Missing ','";
 905           break;
 906         }
 907       str = parse_ac (str, &op2);
 908       if (op2.error)
 909         break;
 910       insn.code |= op2.code << 6;
 911       break;
 912
 913     case PDP11_OPCODE_OP_OP:
 914       str = parse_op (str, &op1);
 915       if (op1.error)
 916         break;
 917       insn.code |= op1.code << 6;
 918       if (op1.additional)
 919         size += 2;
 920       str = parse_separator (str, &error);
 921       if (error)
 922         {
 923           op2.error = "Missing ','";
 924           break;
 925         }
 926       str = parse_op (str, &op2);
 927       if (op2.error)
 928         break;
 929       insn.code |= op2.code;
 930       if (op2.additional)
 931         size += 2;
 932       break;
 933
 934     case PDP11_OPCODE_REG_DISPL:
 935       {
 936         char *new;
 937         str = parse_reg (str, &op2);
 938         if (op2.error)
 939           break;
 940         insn.code |= op2.code << 6;
 941         str = parse_separator (str, &error);
 942         if (error)
 943           {
 944             op1.error = "Missing ','";
 945             break;
 946           }
 947         new = parse_expression (str, &op1);
 948         op1.code = 0;
 949         op1.reloc.pc_rel = 1;
 950         op1.reloc.type = BFD_RELOC_PDP11_DISP_6_PCREL;
 951         if (op1.reloc.exp.X_op != O_symbol)
 952           {
 953             op1.error = "Symbol expected";
 954             break;
 955           }
 956         if (op1.code & ~0x3f)
 957           {
 958             err = "6-bit displacement out of range";
 959             break;
 960           }
 961         str = new;
 962         insn.code |= op1.code;
 963         insn.reloc = op1.reloc;
 964       }
 965       break;
 966
 967     default:
 968       BAD_CASE (op->type);
 969     }
 970
 971   if (op1.error)
 972     err = op1.error;
 973   else if (op2.error)
 974     err = op2.error;
 975   else
 976     {
 977       str = skip_whitespace (str);
 978       if (*str)
 979         err = "Too many operands";
 980     }
 981
 982   {
 983     char *to = NULL;
 984
 985     if (err)
 986       {
 987         as_bad (err);
 988         return;
 989       }
 990
 991     to = frag_more (size);
 992
 993     md_number_to_chars (to, insn.code, 2);
 994     if (insn.reloc.type != BFD_RELOC_NONE)
 995       fix_new_exp (frag_now, to - frag_now->fr_literal, 2,
 996                    &insn.reloc.exp, insn.reloc.pc_rel, insn.reloc.type);
 997     to += 2;
 998
 999     if (op1.additional)
1000       {
1001         md_number_to_chars (to, op1.word, 2);
1002         if (op1.reloc.type != BFD_RELOC_NONE)
1003           fix_new_exp (frag_now, to - frag_now->fr_literal, 2,
1004                        &op1.reloc.exp, op1.reloc.pc_rel, op1.reloc.type);
1005         to += 2;
1006       }
1007
1008     if (op2.additional)
1009       {
1010         md_number_to_chars (to, op2.word, 2);
1011         if (op2.reloc.type != BFD_RELOC_NONE)
1012           fix_new_exp (frag_now, to - frag_now->fr_literal, 2,
1013                        &op2.reloc.exp, op2.reloc.pc_rel, op2.reloc.type);
1014       }
1015   }
1016 }
1017
1018 int
1019 md_estimate_size_before_relax (fragS *fragP ATTRIBUTE_UNUSED,
1020                                segT segment ATTRIBUTE_UNUSED)
1021 {
1022   return 0;
1023 }
1024
1025 void
1026 md_convert_frag (bfd *headers ATTRIBUTE_UNUSED,
1027                  segT seg ATTRIBUTE_UNUSED,
1028                  fragS *fragP ATTRIBUTE_UNUSED)
1029 {
1030 }
1031
1032 int md_short_jump_size = 2;
1033 int md_long_jump_size = 4;
1034
1035 void
1036 md_create_short_jump (char *ptr ATTRIBUTE_UNUSED,
1037                       addressT from_addr ATTRIBUTE_UNUSED,
1038                       addressT to_addr ATTRIBUTE_UNUSED,
1039                       fragS *frag ATTRIBUTE_UNUSED,
1040                       symbolS *to_symbol ATTRIBUTE_UNUSED)
1041 {
1042 }
1043
1044 void
1045 md_create_long_jump (char *ptr ATTRIBUTE_UNUSED,
1046                      addressT from_addr ATTRIBUTE_UNUSED,
1047                      addressT to_addr ATTRIBUTE_UNUSED,
1048                      fragS *frag ATTRIBUTE_UNUSED,
1049                      symbolS *to_symbol ATTRIBUTE_UNUSED)
1050 {
1051 }
1052
1053 static int
1054 set_cpu_model (char *arg)
1055 {
1056   char buf[4];
1057   char *model = buf;
1058
1059   if (arg[0] == 'k')
1060     arg++;
1061
1062   *model++ = *arg++;
1063
1064   if (strchr ("abdx", model[-1]) == NULL)
1065     return 0;
1066
1067   if (model[-1] == 'd')
1068     {
1069       if (arg[0] == 'f' || arg[0] == 'j')
1070         model[-1] = *arg++;
1071     }
1072   else if (model[-1] == 'x')
1073     {
1074       if (arg[0] == 't')
1075         model[-1] = *arg++;
1076     }
1077
1078   if (arg[0] == '-')
1079     arg++;
1080
1081   if (strncmp (arg, "11", 2) != 0)
1082     return 0;
1083   arg += 2;
1084
1085   if (arg[0] == '-')
1086     {
1087       if (*++arg == 0)
1088         return 0;
1089     }
1090
1091   /* Allow up to two revision letters.  */
1092   if (arg[0] != 0)
1093     *model++ = *arg++;
1094   if (arg[0] != 0)
1095     *model++ = *arg++;
1096
1097   *model++ = 0;
1098
1099   set_option ("no-extensions");
1100
1101   /* KA11 (11/15/20).  */
1102   if (strncmp (buf, "a", 1) == 0)
1103     return 1; /* No extensions.  */
1104
1105   /* KB11 (11/45/50/55/70).  */
1106   else if (strncmp (buf, "b", 1) == 0)
1107     return set_option ("eis") && set_option ("spl");
1108
1109   /* KD11-A (11/35/40).  */
1110   else if (strncmp (buf, "da", 2) == 0)
1111     return set_option ("limited-eis");
1112
1113   /* KD11-B (11/05/10).  */
1114   else if (strncmp (buf, "db", 2) == 0
1115            /* KD11-D (11/04).  */
1116            || strncmp (buf, "dd", 2) == 0)
1117     return 1; /* no extensions */
1118
1119   /* KD11-E (11/34).  */
1120   else if (strncmp (buf, "de", 2) == 0)
1121     return set_option ("eis") && set_option ("mxps");
1122
1123   /* KD11-F (11/03).  */
1124   else if (strncmp (buf, "df", 2) == 0
1125            /* KD11-H (11/03).  */
1126            || strncmp (buf, "dh", 2) == 0
1127            /* KD11-Q (11/03).  */
1128            || strncmp (buf, "dq", 2) == 0)
1129     return set_option ("limited-eis") && set_option ("mxps");
1130
1131   /* KD11-K (11/60).  */
1132   else if (strncmp (buf, "dk", 2) == 0)
1133     return set_option ("eis")
1134       && set_option ("mxps")
1135       && set_option ("ucode");
1136
1137   /* KD11-Z (11/44).  */
1138   else if (strncmp (buf, "dz", 2) == 0)
1139     return set_option ("csm")
1140       && set_option ("eis")
1141       && set_option ("mfpt")
1142       && set_option ("mxps")
1143       && set_option ("spl");
1144
1145   /* F11 (11/23/24).  */
1146   else if (strncmp (buf, "f", 1) == 0)
1147     return set_option ("eis")
1148       && set_option ("mfpt")
1149       && set_option ("mxps");
1150
1151   /* J11 (11/53/73/83/84/93/94).  */
1152   else if (strncmp (buf, "j", 1) == 0)
1153     return set_option ("csm")
1154       && set_option ("eis")
1155       && set_option ("mfpt")
1156       && set_option ("multiproc")
1157       && set_option ("mxps")
1158       && set_option ("spl");
1159
1160   /* T11 (11/21).  */
1161   else if (strncmp (buf, "t", 1) == 0)
1162     return set_option ("limited-eis")
1163       && set_option ("mxps");
1164
1165   else
1166     return 0;
1167 }
1168
1169 static int
1170 set_machine_model (char *arg)
1171 {
1172   if (strncmp (arg, "pdp-11/", 7) != 0
1173       && strncmp (arg, "pdp11/", 6) != 0
1174       && strncmp (arg, "11/", 3) != 0)
1175     return 0;
1176
1177   if (strncmp (arg, "pdp", 3) == 0)
1178     arg += 3;
1179   if (arg[0] == '-')
1180     arg++;
1181   if (strncmp (arg, "11/", 3) == 0)
1182     arg += 3;
1183
1184   if (strcmp (arg, "03") == 0)
1185     return set_cpu_model ("kd11f");
1186
1187   else if (strcmp (arg, "04") == 0)
1188     return set_cpu_model ("kd11d");
1189
1190   else if (strcmp (arg, "05") == 0
1191            || strcmp (arg, "10") == 0)
1192     return set_cpu_model ("kd11b");
1193
1194   else if (strcmp (arg, "15") == 0
1195            || strcmp (arg, "20") == 0)
1196     return set_cpu_model ("ka11");
1197
1198   else if (strcmp (arg, "21") == 0)
1199     return set_cpu_model ("t11");
1200
1201   else if (strcmp (arg, "23") == 0
1202            || strcmp (arg, "24") == 0)
1203     return set_cpu_model ("f11");
1204
1205   else if (strcmp (arg, "34") == 0
1206            || strcmp (arg, "34a") == 0)
1207     return set_cpu_model ("kd11e");
1208
1209   else if (strcmp (arg, "35") == 0
1210            || strcmp (arg, "40") == 0)
1211     return set_cpu_model ("kd11da");
1212
1213   else if (strcmp (arg, "44") == 0)
1214     return set_cpu_model ("kd11dz");
1215
1216   else if (strcmp (arg, "45") == 0
1217            || strcmp (arg, "50") == 0
1218            || strcmp (arg, "55") == 0
1219            || strcmp (arg, "70") == 0)
1220     return set_cpu_model ("kb11");
1221
1222   else if (strcmp (arg, "60") == 0)
1223     return set_cpu_model ("kd11k");
1224
1225   else if (strcmp (arg, "53") == 0
1226            || strcmp (arg, "73") == 0
1227            || strcmp (arg, "83") == 0
1228            || strcmp (arg, "84") == 0
1229            || strcmp (arg, "93") == 0
1230            || strcmp (arg, "94") == 0)
1231     return set_cpu_model ("j11")
1232       && set_option ("fpp");
1233
1234   else
1235     return 0;
1236 }
1237
1238 const char *md_shortopts = "m:";
1239
1240 struct option md_longopts[] =
1241 {
1242 #define OPTION_CPU 257
1243   { "cpu", required_argument, NULL, OPTION_CPU },
1244 #define OPTION_MACHINE 258
1245   { "machine", required_argument, NULL, OPTION_MACHINE },
1246 #define OPTION_PIC 259
1247   { "pic", no_argument, NULL, OPTION_PIC },
1248   { NULL, no_argument, NULL, 0 }
1249 };
1250
1251 size_t md_longopts_size = sizeof (md_longopts);
1252
1253 /* Invocation line includes a switch not recognized by the base assembler.
1254    See if it's a processor-specific option.  */
1255
1256 int
1257 md_parse_option (int c, char *arg)
1258 {
1259   init_defaults ();
1260
1261   switch (c)
1262     {
1263     case 'm':
1264       if (set_option (arg))
1265         return 1;
1266       if (set_cpu_model (arg))
1267         return 1;
1268       if (set_machine_model (arg))
1269         return 1;
1270       break;
1271
1272     case OPTION_CPU:
1273       if (set_cpu_model (arg))
1274         return 1;
1275       break;
1276
1277     case OPTION_MACHINE:
1278       if (set_machine_model (arg))
1279         return 1;
1280       break;
1281
1282     case OPTION_PIC:
1283       if (set_option ("pic"))
1284         return 1;
1285       break;
1286
1287     default:
1288       break;
1289     }
1290
1291   return 0;
1292 }
1293
1294 void
1295 md_show_usage (FILE *stream)
1296 {
1297   fprintf (stream, "\
1298 \n\
1299 PDP-11 instruction set extentions:\n\
1300 \n\
1301 -m(no-)cis              allow (disallow) commersial instruction set\n\
1302 -m(no-)csm              allow (disallow) CSM instruction\n\
1303 -m(no-)eis              allow (disallow) full extended instruction set\n\
1304 -m(no-)fis              allow (disallow) KEV11 floating-point instructions\n\
1305 -m(no-)fpp              allow (disallow) FP-11 floating-point instructions\n\
1306 -m(no-)fpu              allow (disallow) FP-11 floating-point instructions\n\
1307 -m(no-)limited-eis      allow (disallow) limited extended instruction set\n\
1308 -m(no-)mfpt             allow (disallow) processor type instruction\n\
1309 -m(no-)multiproc        allow (disallow) multiprocessor instructions\n\
1310 -m(no-)mxps             allow (disallow) processor status instructions\n\
1311 -m(no-)spl              allow (disallow) SPL instruction\n\
1312 -m(no-)ucode            allow (disallow) microcode instructions\n\
1313 -mall-extensions        allow all instruction set extensions\n\
1314                         (this is the default)\n\
1315 -mno-extentions         disallow all instruction set extensions\n\
1316 -pic                    generate position-indepenent code\n\
1317 \n\
1318 PDP-11 CPU model options:\n\
1319 \n\
1320 -mka11*                 KA11 CPU.  base line instruction set only\n\
1321 -mkb11*                 KB11 CPU.  enable full EIS and SPL\n\
1322 -mkd11a*                KD11-A CPU.  enable limited EIS\n\
1323 -mkd11b*                KD11-B CPU.  base line instruction set only\n\
1324 -mkd11d*                KD11-D CPU.  base line instruction set only\n\
1325 -mkd11e*                KD11-E CPU.  enable full EIS, MTPS, and MFPS\n\
1326 -mkd11f*                KD11-F CPU.  enable limited EIS, MTPS, and MFPS\n\
1327 -mkd11h*                KD11-H CPU.  enable limited EIS, MTPS, and MFPS\n\
1328 -mkd11q*                KD11-Q CPU.  enable limited EIS, MTPS, and MFPS\n\
1329 -mkd11k*                KD11-K CPU.  enable full EIS, MTPS, MFPS, LDUB, MED,\n\
1330                         XFC, and MFPT\n\
1331 -mkd11z*                KD11-Z CPU.  enable full EIS, MTPS, MFPS, MFPT, SPL,\n\
1332                         and CSM\n\
1333 -mf11*                  F11 CPU.  enable full EIS, MFPS, MTPS, and MFPT\n\
1334 -mj11*                  J11 CPU.  enable full EIS, MTPS, MFPS, MFPT, SPL,\n\
1335                         CSM, TSTSET, and WRTLCK\n\
1336 -mt11*                  T11 CPU.  enable limited EIS, MTPS, and MFPS\n\
1337 \n\
1338 PDP-11 machine model options:\n\
1339 \n\
1340 -m11/03                 same as -mkd11f\n\
1341 -m11/04                 same as -mkd11d\n\
1342 -m11/05                 same as -mkd11b\n\
1343 -m11/10                 same as -mkd11b\n\
1344 -m11/15                 same as -mka11\n\
1345 -m11/20                 same as -mka11\n\
1346 -m11/21                 same as -mt11\n\
1347 -m11/23                 same as -mf11\n\
1348 -m11/24                 same as -mf11\n\
1349 -m11/34                 same as -mkd11e\n\
1350 -m11/34a                same as -mkd11e -mfpp\n\
1351 -m11/35                 same as -mkd11a\n\
1352 -m11/40                 same as -mkd11a\n\
1353 -m11/44                 same as -mkd11z\n\
1354 -m11/45                 same as -mkb11\n\
1355 -m11/50                 same as -mkb11\n\
1356 -m11/53                 same as -mj11\n\
1357 -m11/55                 same as -mkb11\n\
1358 -m11/60                 same as -mkd11k\n\
1359 -m11/70                 same as -mkb11\n\
1360 -m11/73                 same as -mj11\n\
1361 -m11/83                 same as -mj11\n\
1362 -m11/84                 same as -mj11\n\
1363 -m11/93                 same as -mj11\n\
1364 -m11/94                 same as -mj11\n\
1365 ");
1366 }
1367
1368 symbolS *
1369 md_undefined_symbol (char *name ATTRIBUTE_UNUSED)
1370 {
1371   return 0;
1372 }
1373
1374 valueT
1375 md_section_align (segT segment ATTRIBUTE_UNUSED,
1376                   valueT size)
1377 {
1378   return (size + 1) & ~1;
1379 }
1380
1381 long
1382 md_pcrel_from (fixS *fixP)
1383 {
1384   return fixP->fx_frag->fr_address + fixP->fx_where + fixP->fx_size;
1385 }
1386
1387 /* Translate internal representation of relocation info to BFD target
1388    format.  */
1389
1390 arelent *
1391 tc_gen_reloc (asection *section ATTRIBUTE_UNUSED,
1392               fixS *fixp)
1393 {
1394   arelent *reloc;
1395   bfd_reloc_code_real_type code;
1396
1397   reloc = xmalloc (sizeof (* reloc));
1398
1399   reloc->sym_ptr_ptr = xmalloc (sizeof (asymbol *));
1400   *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
1401   reloc->address = fixp->fx_frag->fr_address + fixp->fx_where;
1402
1403   /* This is taken account for in md_apply_fix3().  */
1404   reloc->addend = -symbol_get_bfdsym (fixp->fx_addsy)->section->vma;
1405
1406   switch (fixp->fx_r_type)
1407     {
1408     case BFD_RELOC_16:
1409       if (fixp->fx_pcrel)
1410         code = BFD_RELOC_16_PCREL;
1411       else
1412         code = BFD_RELOC_16;
1413       break;
1414
1415     case BFD_RELOC_16_PCREL:
1416       code = BFD_RELOC_16_PCREL;
1417       break;
1418
1419     default:
1420       BAD_CASE (fixp->fx_r_type);
1421       return NULL;
1422     }
1423
1424   reloc->howto = bfd_reloc_type_lookup (stdoutput, code);
1425
1426   if (reloc->howto == NULL)
1427     {
1428       as_bad_where (fixp->fx_file, fixp->fx_line,
1429                     "Can not represent %s relocation in this object file format",
1430                     bfd_get_reloc_code_name (code));
1431       return NULL;
1432     }
1433
1434   return reloc;
1435 }
1436
1437 void
1438 pseudo_bss (int c ATTRIBUTE_UNUSED)
1439 {
1440   int temp;
1441
1442   temp = get_absolute_expression ();
1443   subseg_set (bss_section, temp);
1444   demand_empty_rest_of_line ();
1445 }
1446
1447 void
1448 pseudo_even (int c ATTRIBUTE_UNUSED)
1449 {
1450   int alignment = 1; /* 2^1 */
1451   frag_align (alignment, 0, 1);
1452   record_alignment (now_seg, alignment);
1453 }