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         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             operand->code = 067;
 529             operand->additional = 1;
 530             operand->word = 0;
 531             operand->reloc.type = BFD_RELOC_16_PCREL;
 532             operand->reloc.pc_rel = 1;
 533             break;
 534           }
 535
 536         /* d(rn) */
 537         str++;
 538         str = parse_reg (str, operand);
 539         if (operand->error)
 540           return str;
 541
 542         str = skip_whitespace (str);
 543
 544         if (*str != ')')
 545           {
 546             operand->error = _("Missing ')'");
 547             return str;
 548           }
 549
 550         str++;
 551         operand->additional = TRUE;
 552         operand->code |= 060;
 553         switch (operand->reloc.exp.X_op)
 554           {
 555           case O_symbol:
 556             operand->reloc.type = BFD_RELOC_16;
 557             operand->reloc.pc_rel = 0;
 558             break;
 559           case O_constant:
 560             if ((operand->code & 7) == 7)
 561               {
 562                 operand->reloc.pc_rel = 1;
 563                 operand->word = operand->reloc.exp.X_add_number;
 564               }
 565             else
 566               operand->word = operand->reloc.exp.X_add_number;
 567
 568             break;
 569           default:
 570             BAD_CASE (operand->reloc.exp.X_op);
 571           }
 572         break;
 573       }
 574     }
 575
 576   return str;
 577 }
 578
 579 static char *
 580 parse_op_noreg (char *str, struct pdp11_code *operand)
 581 {
 582   str = skip_whitespace (str);
 583   operand->error = NULL;
 584
 585   if (*str == '@' || *str == '*')
 586     {
 587       str = parse_op_no_deferred (str + 1, operand);
 588       if (operand->error)
 589         return str;
 590       operand->code |= 010;
 591     }
 592   else
 593     str = parse_op_no_deferred (str, operand);
 594
 595   return str;
 596 }
 597
 598 static char *
 599 parse_op (char *str, struct pdp11_code *operand)
 600 {
 601   str = skip_whitespace (str);
 602
 603   str = parse_reg (str, operand);
 604   if (!operand->error)
 605     return str;
 606
 607   operand->error = NULL;
 608   parse_ac5 (str, operand);
 609   if (!operand->error)
 610     {
 611       operand->error = _("Float AC not legal as integer operand");
 612       return str;
 613     }
 614
 615   return parse_op_noreg (str, operand);
 616 }
 617
 618 static char *
 619 parse_fop (char *str, struct pdp11_code *operand)
 620 {
 621   str = skip_whitespace (str);
 622
 623   str = parse_ac5 (str, operand);
 624   if (!operand->error)
 625     return str;
 626
 627   operand->error = NULL;
 628   parse_reg (str, operand);
 629   if (!operand->error)
 630     {
 631       operand->error = _("General register not legal as float operand");
 632       return str;
 633     }
 634
 635   return parse_op_noreg (str, operand);
 636 }
 637
 638 static char *
 639 parse_separator (char *str, int *error)
 640 {
 641   str = skip_whitespace (str);
 642   *error = (*str != ',');
 643   if (!*error)
 644     str++;
 645   return str;
 646 }
 647
 648 void
 649 md_assemble (char *instruction_string)
 650 {
 651   const struct pdp11_opcode *op;
 652   struct pdp11_code insn, op1, op2;
 653   int error;
 654   int size;
 655   char *err = NULL;
 656   char *str;
 657   char *p;
 658   char c;
 659
 660   str = skip_whitespace (instruction_string);
 661   p = find_whitespace (str);
 662   if (p - str == 0)
 663     {
 664       as_bad (_("No instruction found"));
 665       return;
 666     }
 667
 668   c = *p;
 669   *p = '\0';
 670   op = (struct pdp11_opcode *)hash_find (insn_hash, str);
 671   *p = c;
 672   if (op == 0)
 673     {
 674       as_bad (_("Unknown instruction '%s'"), str);
 675       return;
 676     }
 677
 678   if (!pdp11_extension[op->extension])
 679     {
 680       as_warn (_("Unsupported instruction set extension: %s"), op->name);
 681       return;
 682     }
 683
 684   insn.error = NULL;
 685   insn.code = op->opcode;
 686   insn.reloc.type = BFD_RELOC_NONE;
 687   op1.error = NULL;
 688   op1.additional = FALSE;
 689   op1.reloc.type = BFD_RELOC_NONE;
 690   op2.error = NULL;
 691   op2.additional = FALSE;
 692   op2.reloc.type = BFD_RELOC_NONE;
 693
 694   str = p;
 695   size = 2;
 696
 697   switch (op->type)
 698     {
 699     case PDP11_OPCODE_NO_OPS:
 700       str = skip_whitespace (str);
 701       if (*str == 0)
 702         str = "";
 703       break;
 704
 705     case PDP11_OPCODE_IMM3:
 706     case PDP11_OPCODE_IMM6:
 707     case PDP11_OPCODE_IMM8:
 708       str = skip_whitespace (str);
 709       if (*str == '#' || *str == '$')
 710         str++;
 711       str = parse_expression (str, &op1);
 712       if (op1.error)
 713         break;
 714       if (op1.reloc.exp.X_op != O_constant || op1.reloc.type != BFD_RELOC_NONE)
 715         {
 716           op1.error = _("operand is not an absolute constant");
 717           break;
 718         }
 719       switch (op->type)
 720         {
 721         case PDP11_OPCODE_IMM3:
 722           if (op1.reloc.exp.X_add_number & ~7)
 723             {
 724               op1.error = _("3-bit immediate out of range");
 725               break;
 726             }
 727           break;
 728         case PDP11_OPCODE_IMM6:
 729           if (op1.reloc.exp.X_add_number & ~0x3f)
 730             {
 731               op1.error = _("6-bit immediate out of range");
 732               break;
 733             }
 734           break;
 735         case PDP11_OPCODE_IMM8:
 736           if (op1.reloc.exp.X_add_number & ~0xff)
 737             {
 738               op1.error = _("8-bit immediate out of range");
 739               break;
 740             }
 741           break;
 742         }
 743       insn.code |= op1.reloc.exp.X_add_number;
 744       break;
 745
 746     case PDP11_OPCODE_DISPL:
 747       {
 748         char *new_pointer;
 749         new_pointer = parse_expression (str, &op1);
 750         op1.code = 0;
 751         op1.reloc.pc_rel = 1;
 752         op1.reloc.type = BFD_RELOC_PDP11_DISP_8_PCREL;
 753         if (op1.reloc.exp.X_op != O_symbol)
 754           {
 755             op1.error = _("Symbol expected");
 756             break;
 757           }
 758         if (op1.code & ~0xff)
 759           {
 760             err = _("8-bit displacement out of range");
 761             break;
 762           }
 763         str = new_pointer;
 764         insn.code |= op1.code;
 765         insn.reloc = op1.reloc;
 766       }
 767       break;
 768
 769     case PDP11_OPCODE_REG:
 770       str = parse_reg (str, &op1);
 771       if (op1.error)
 772         break;
 773       insn.code |= op1.code;
 774       break;
 775
 776     case PDP11_OPCODE_OP:
 777       str = parse_op (str, &op1);
 778       if (op1.error)
 779         break;
 780       insn.code |= op1.code;
 781       if (op1.additional)
 782         size += 2;
 783       break;
 784
 785     case PDP11_OPCODE_FOP:
 786       str = parse_fop (str, &op1);
 787       if (op1.error)
 788         break;
 789       insn.code |= op1.code;
 790       if (op1.additional)
 791         size += 2;
 792       break;
 793
 794     case PDP11_OPCODE_REG_OP:
 795       str = parse_reg (str, &op2);
 796       if (op2.error)
 797         break;
 798       insn.code |= op2.code << 6;
 799       str = parse_separator (str, &error);
 800       if (error)
 801         {
 802           op2.error = _("Missing ','");
 803           break;
 804         }
 805       str = parse_op (str, &op1);
 806       if (op1.error)
 807         break;
 808       insn.code |= op1.code;
 809       if (op1.additional)
 810         size += 2;
 811       break;
 812
 813     case PDP11_OPCODE_REG_OP_REV:
 814       str = parse_op (str, &op1);
 815       if (op1.error)
 816         break;
 817       insn.code |= op1.code;
 818       if (op1.additional)
 819         size += 2;
 820       str = parse_separator (str, &error);
 821       if (error)
 822         {
 823           op2.error = _("Missing ','");
 824           break;
 825         }
 826       str = parse_reg (str, &op2);
 827       if (op2.error)
 828         break;
 829       insn.code |= op2.code << 6;
 830       break;
 831
 832     case PDP11_OPCODE_AC_FOP:
 833       str = parse_ac (str, &op2);
 834       if (op2.error)
 835         break;
 836       insn.code |= op2.code << 6;
 837       str = parse_separator (str, &error);
 838       if (error)
 839         {
 840           op1.error = _("Missing ','");
 841           break;
 842         }
 843       str = parse_fop (str, &op1);
 844       if (op1.error)
 845         break;
 846       insn.code |= op1.code;
 847       if (op1.additional)
 848         size += 2;
 849       break;
 850
 851     case PDP11_OPCODE_FOP_AC:
 852       str = parse_fop (str, &op1);
 853       if (op1.error)
 854         break;
 855       insn.code |= op1.code;
 856       if (op1.additional)
 857         size += 2;
 858       str = parse_separator (str, &error);
 859       if (error)
 860         {
 861           op1.error = _("Missing ','");
 862           break;
 863         }
 864       str = parse_ac (str, &op2);
 865       if (op2.error)
 866         break;
 867       insn.code |= op2.code << 6;
 868       break;
 869
 870     case PDP11_OPCODE_AC_OP:
 871       str = parse_ac (str, &op2);
 872       if (op2.error)
 873         break;
 874       insn.code |= op2.code << 6;
 875       str = parse_separator (str, &error);
 876       if (error)
 877         {
 878           op1.error = _("Missing ','");
 879           break;
 880         }
 881       str = parse_op (str, &op1);
 882       if (op1.error)
 883         break;
 884       insn.code |= op1.code;
 885       if (op1.additional)
 886         size += 2;
 887       break;
 888
 889     case PDP11_OPCODE_OP_AC:
 890       str = parse_op (str, &op1);
 891       if (op1.error)
 892         break;
 893       insn.code |= op1.code;
 894       if (op1.additional)
 895         size += 2;
 896       str = parse_separator (str, &error);
 897       if (error)
 898         {
 899           op1.error = _("Missing ','");
 900           break;
 901         }
 902       str = parse_ac (str, &op2);
 903       if (op2.error)
 904         break;
 905       insn.code |= op2.code << 6;
 906       break;
 907
 908     case PDP11_OPCODE_OP_OP:
 909       str = parse_op (str, &op1);
 910       if (op1.error)
 911         break;
 912       insn.code |= op1.code << 6;
 913       if (op1.additional)
 914         size += 2;
 915       str = parse_separator (str, &error);
 916       if (error)
 917         {
 918           op2.error = _("Missing ','");
 919           break;
 920         }
 921       str = parse_op (str, &op2);
 922       if (op2.error)
 923         break;
 924       insn.code |= op2.code;
 925       if (op2.additional)
 926         size += 2;
 927       break;
 928
 929     case PDP11_OPCODE_REG_DISPL:
 930       {
 931         char *new_pointer;
 932         str = parse_reg (str, &op2);
 933         if (op2.error)
 934           break;
 935         insn.code |= op2.code << 6;
 936         str = parse_separator (str, &error);
 937         if (error)
 938           {
 939             op1.error = _("Missing ','");
 940             break;
 941           }
 942         new_pointer = parse_expression (str, &op1);
 943         op1.code = 0;
 944         op1.reloc.pc_rel = 1;
 945         op1.reloc.type = BFD_RELOC_PDP11_DISP_6_PCREL;
 946         if (op1.reloc.exp.X_op != O_symbol)
 947           {
 948             op1.error = _("Symbol expected");
 949             break;
 950           }
 951         if (op1.code & ~0x3f)
 952           {
 953             err = _("6-bit displacement out of range");
 954             break;
 955           }
 956         str = new_pointer;
 957         insn.code |= op1.code;
 958         insn.reloc = op1.reloc;
 959       }
 960       break;
 961
 962     default:
 963       BAD_CASE (op->type);
 964     }
 965
 966   if (op1.error)
 967     err = op1.error;
 968   else if (op2.error)
 969     err = op2.error;
 970   else
 971     {
 972       str = skip_whitespace (str);
 973       if (*str)
 974         err = _("Too many operands");
 975     }
 976
 977   {
 978     char *to = NULL;
 979
 980     if (err)
 981       {
 982         as_bad ("%s", err);
 983         return;
 984       }
 985
 986     to = frag_more (size);
 987
 988     md_number_to_chars (to, insn.code, 2);
 989     if (insn.reloc.type != BFD_RELOC_NONE)
 990       fix_new_exp (frag_now, to - frag_now->fr_literal, 2,
 991                    &insn.reloc.exp, insn.reloc.pc_rel, insn.reloc.type);
 992     to += 2;
 993
 994     if (op1.additional)
 995       {
 996         md_number_to_chars (to, op1.word, 2);
 997         if (op1.reloc.type != BFD_RELOC_NONE)
 998           fix_new_exp (frag_now, to - frag_now->fr_literal, 2,
 999                        &op1.reloc.exp, op1.reloc.pc_rel, op1.reloc.type);
1000         to += 2;
1001       }
1002
1003     if (op2.additional)
1004       {
1005         md_number_to_chars (to, op2.word, 2);
1006         if (op2.reloc.type != BFD_RELOC_NONE)
1007           fix_new_exp (frag_now, to - frag_now->fr_literal, 2,
1008                        &op2.reloc.exp, op2.reloc.pc_rel, op2.reloc.type);
1009       }
1010   }
1011 }
1012
1013 int
1014 md_estimate_size_before_relax (fragS *fragP ATTRIBUTE_UNUSED,
1015                                segT segment ATTRIBUTE_UNUSED)
1016 {
1017   return 0;
1018 }
1019
1020 void
1021 md_convert_frag (bfd *headers ATTRIBUTE_UNUSED,
1022                  segT seg ATTRIBUTE_UNUSED,
1023                  fragS *fragP ATTRIBUTE_UNUSED)
1024 {
1025 }
1026
1027 int md_short_jump_size = 2;
1028 int md_long_jump_size = 4;
1029
1030 void
1031 md_create_short_jump (char *ptr ATTRIBUTE_UNUSED,
1032                       addressT from_addr ATTRIBUTE_UNUSED,
1033                       addressT to_addr ATTRIBUTE_UNUSED,
1034                       fragS *frag ATTRIBUTE_UNUSED,
1035                       symbolS *to_symbol ATTRIBUTE_UNUSED)
1036 {
1037 }
1038
1039 void
1040 md_create_long_jump (char *ptr ATTRIBUTE_UNUSED,
1041                      addressT from_addr ATTRIBUTE_UNUSED,
1042                      addressT to_addr ATTRIBUTE_UNUSED,
1043                      fragS *frag ATTRIBUTE_UNUSED,
1044                      symbolS *to_symbol ATTRIBUTE_UNUSED)
1045 {
1046 }
1047
1048 static int
1049 set_cpu_model (char *arg)
1050 {
1051   char buf[4];
1052   char *model = buf;
1053
1054   if (arg[0] == 'k')
1055     arg++;
1056
1057   *model++ = *arg++;
1058
1059   if (strchr ("abdx", model[-1]) == NULL)
1060     return 0;
1061
1062   if (model[-1] == 'd')
1063     {
1064       if (arg[0] == 'f' || arg[0] == 'j')
1065         model[-1] = *arg++;
1066     }
1067   else if (model[-1] == 'x')
1068     {
1069       if (arg[0] == 't')
1070         model[-1] = *arg++;
1071     }
1072
1073   if (arg[0] == '-')
1074     arg++;
1075
1076   if (strncmp (arg, "11", 2) != 0)
1077     return 0;
1078   arg += 2;
1079
1080   if (arg[0] == '-')
1081     {
1082       if (*++arg == 0)
1083         return 0;
1084     }
1085
1086   /* Allow up to two revision letters.  */
1087   if (arg[0] != 0)
1088     *model++ = *arg++;
1089   if (arg[0] != 0)
1090     *model++ = *arg++;
1091
1092   *model++ = 0;
1093
1094   set_option ("no-extensions");
1095
1096   /* KA11 (11/15/20).  */
1097   if (strncmp (buf, "a", 1) == 0)
1098     return 1; /* No extensions.  */
1099
1100   /* KB11 (11/45/50/55/70).  */
1101   else if (strncmp (buf, "b", 1) == 0)
1102     return set_option ("eis") && set_option ("spl");
1103
1104   /* KD11-A (11/35/40).  */
1105   else if (strncmp (buf, "da", 2) == 0)
1106     return set_option ("limited-eis");
1107
1108   /* KD11-B (11/05/10).  */
1109   else if (strncmp (buf, "db", 2) == 0
1110            /* KD11-D (11/04).  */
1111            || strncmp (buf, "dd", 2) == 0)
1112     return 1; /* no extensions */
1113
1114   /* KD11-E (11/34).  */
1115   else if (strncmp (buf, "de", 2) == 0)
1116     return set_option ("eis") && set_option ("mxps");
1117
1118   /* KD11-F (11/03).  */
1119   else if (strncmp (buf, "df", 2) == 0
1120            /* KD11-H (11/03).  */
1121            || strncmp (buf, "dh", 2) == 0
1122            /* KD11-Q (11/03).  */
1123            || strncmp (buf, "dq", 2) == 0)
1124     return set_option ("limited-eis") && set_option ("mxps");
1125
1126   /* KD11-K (11/60).  */
1127   else if (strncmp (buf, "dk", 2) == 0)
1128     return set_option ("eis")
1129       && set_option ("mxps")
1130       && set_option ("ucode");
1131
1132   /* KD11-Z (11/44).  */
1133   else if (strncmp (buf, "dz", 2) == 0)
1134     return set_option ("csm")
1135       && set_option ("eis")
1136       && set_option ("mfpt")
1137       && set_option ("mxps")
1138       && set_option ("spl");
1139
1140   /* F11 (11/23/24).  */
1141   else if (strncmp (buf, "f", 1) == 0)
1142     return set_option ("eis")
1143       && set_option ("mfpt")
1144       && set_option ("mxps");
1145
1146   /* J11 (11/53/73/83/84/93/94).  */
1147   else if (strncmp (buf, "j", 1) == 0)
1148     return set_option ("csm")
1149       && set_option ("eis")
1150       && set_option ("mfpt")
1151       && set_option ("multiproc")
1152       && set_option ("mxps")
1153       && set_option ("spl");
1154
1155   /* T11 (11/21).  */
1156   else if (strncmp (buf, "t", 1) == 0)
1157     return set_option ("limited-eis")
1158       && set_option ("mxps");
1159
1160   else
1161     return 0;
1162 }
1163
1164 static int
1165 set_machine_model (char *arg)
1166 {
1167   if (strncmp (arg, "pdp-11/", 7) != 0
1168       && strncmp (arg, "pdp11/", 6) != 0
1169       && strncmp (arg, "11/", 3) != 0)
1170     return 0;
1171
1172   if (strncmp (arg, "pdp", 3) == 0)
1173     arg += 3;
1174   if (arg[0] == '-')
1175     arg++;
1176   if (strncmp (arg, "11/", 3) == 0)
1177     arg += 3;
1178
1179   if (strcmp (arg, "03") == 0)
1180     return set_cpu_model ("kd11f");
1181
1182   else if (strcmp (arg, "04") == 0)
1183     return set_cpu_model ("kd11d");
1184
1185   else if (strcmp (arg, "05") == 0
1186            || strcmp (arg, "10") == 0)
1187     return set_cpu_model ("kd11b");
1188
1189   else if (strcmp (arg, "15") == 0
1190            || strcmp (arg, "20") == 0)
1191     return set_cpu_model ("ka11");
1192
1193   else if (strcmp (arg, "21") == 0)
1194     return set_cpu_model ("t11");
1195
1196   else if (strcmp (arg, "23") == 0
1197            || strcmp (arg, "24") == 0)
1198     return set_cpu_model ("f11");
1199
1200   else if (strcmp (arg, "34") == 0
1201            || strcmp (arg, "34a") == 0)
1202     return set_cpu_model ("kd11e");
1203
1204   else if (strcmp (arg, "35") == 0
1205            || strcmp (arg, "40") == 0)
1206     return set_cpu_model ("kd11da");
1207
1208   else if (strcmp (arg, "44") == 0)
1209     return set_cpu_model ("kd11dz");
1210
1211   else if (strcmp (arg, "45") == 0
1212            || strcmp (arg, "50") == 0
1213            || strcmp (arg, "55") == 0
1214            || strcmp (arg, "70") == 0)
1215     return set_cpu_model ("kb11");
1216
1217   else if (strcmp (arg, "60") == 0)
1218     return set_cpu_model ("kd11k");
1219
1220   else if (strcmp (arg, "53") == 0
1221            || strcmp (arg, "73") == 0
1222            || strcmp (arg, "83") == 0
1223            || strcmp (arg, "84") == 0
1224            || strcmp (arg, "93") == 0
1225            || strcmp (arg, "94") == 0)
1226     return set_cpu_model ("j11")
1227       && set_option ("fpp");
1228
1229   else
1230     return 0;
1231 }
1232
1233 const char *md_shortopts = "m:";
1234
1235 struct option md_longopts[] =
1236 {
1237 #define OPTION_CPU 257
1238   { "cpu", required_argument, NULL, OPTION_CPU },
1239 #define OPTION_MACHINE 258
1240   { "machine", required_argument, NULL, OPTION_MACHINE },
1241 #define OPTION_PIC 259
1242   { "pic", no_argument, NULL, OPTION_PIC },
1243   { NULL, no_argument, NULL, 0 }
1244 };
1245
1246 size_t md_longopts_size = sizeof (md_longopts);
1247
1248 /* Invocation line includes a switch not recognized by the base assembler.
1249    See if it's a processor-specific option.  */
1250
1251 int
1252 md_parse_option (int c, char *arg)
1253 {
1254   init_defaults ();
1255
1256   switch (c)
1257     {
1258     case 'm':
1259       if (set_option (arg))
1260         return 1;
1261       if (set_cpu_model (arg))
1262         return 1;
1263       if (set_machine_model (arg))
1264         return 1;
1265       break;
1266
1267     case OPTION_CPU:
1268       if (set_cpu_model (arg))
1269         return 1;
1270       break;
1271
1272     case OPTION_MACHINE:
1273       if (set_machine_model (arg))
1274         return 1;
1275       break;
1276
1277     case OPTION_PIC:
1278       if (set_option ("pic"))
1279         return 1;
1280       break;
1281
1282     default:
1283       break;
1284     }
1285
1286   return 0;
1287 }
1288
1289 void
1290 md_show_usage (FILE *stream)
1291 {
1292   fprintf (stream, "\
1293 \n\
1294 PDP-11 instruction set extentions:\n\
1295 \n\
1296 -m(no-)cis              allow (disallow) commersial instruction set\n\
1297 -m(no-)csm              allow (disallow) CSM instruction\n\
1298 -m(no-)eis              allow (disallow) full extended instruction set\n\
1299 -m(no-)fis              allow (disallow) KEV11 floating-point instructions\n\
1300 -m(no-)fpp              allow (disallow) FP-11 floating-point instructions\n\
1301 -m(no-)fpu              allow (disallow) FP-11 floating-point instructions\n\
1302 -m(no-)limited-eis      allow (disallow) limited extended instruction set\n\
1303 -m(no-)mfpt             allow (disallow) processor type instruction\n\
1304 -m(no-)multiproc        allow (disallow) multiprocessor instructions\n\
1305 -m(no-)mxps             allow (disallow) processor status instructions\n\
1306 -m(no-)spl              allow (disallow) SPL instruction\n\
1307 -m(no-)ucode            allow (disallow) microcode instructions\n\
1308 -mall-extensions        allow all instruction set extensions\n\
1309                         (this is the default)\n\
1310 -mno-extentions         disallow all instruction set extensions\n\
1311 -pic                    generate position-indepenent code\n\
1312 \n\
1313 PDP-11 CPU model options:\n\
1314 \n\
1315 -mka11*                 KA11 CPU.  base line instruction set only\n\
1316 -mkb11*                 KB11 CPU.  enable full EIS and SPL\n\
1317 -mkd11a*                KD11-A CPU.  enable limited EIS\n\
1318 -mkd11b*                KD11-B CPU.  base line instruction set only\n\
1319 -mkd11d*                KD11-D CPU.  base line instruction set only\n\
1320 -mkd11e*                KD11-E CPU.  enable full EIS, MTPS, and MFPS\n\
1321 -mkd11f*                KD11-F CPU.  enable limited EIS, MTPS, and MFPS\n\
1322 -mkd11h*                KD11-H CPU.  enable limited EIS, MTPS, and MFPS\n\
1323 -mkd11q*                KD11-Q CPU.  enable limited EIS, MTPS, and MFPS\n\
1324 -mkd11k*                KD11-K CPU.  enable full EIS, MTPS, MFPS, LDUB, MED,\n\
1325                         XFC, and MFPT\n\
1326 -mkd11z*                KD11-Z CPU.  enable full EIS, MTPS, MFPS, MFPT, SPL,\n\
1327                         and CSM\n\
1328 -mf11*                  F11 CPU.  enable full EIS, MFPS, MTPS, and MFPT\n\
1329 -mj11*                  J11 CPU.  enable full EIS, MTPS, MFPS, MFPT, SPL,\n\
1330                         CSM, TSTSET, and WRTLCK\n\
1331 -mt11*                  T11 CPU.  enable limited EIS, MTPS, and MFPS\n\
1332 \n\
1333 PDP-11 machine model options:\n\
1334 \n\
1335 -m11/03                 same as -mkd11f\n\
1336 -m11/04                 same as -mkd11d\n\
1337 -m11/05                 same as -mkd11b\n\
1338 -m11/10                 same as -mkd11b\n\
1339 -m11/15                 same as -mka11\n\
1340 -m11/20                 same as -mka11\n\
1341 -m11/21                 same as -mt11\n\
1342 -m11/23                 same as -mf11\n\
1343 -m11/24                 same as -mf11\n\
1344 -m11/34                 same as -mkd11e\n\
1345 -m11/34a                same as -mkd11e -mfpp\n\
1346 -m11/35                 same as -mkd11a\n\
1347 -m11/40                 same as -mkd11a\n\
1348 -m11/44                 same as -mkd11z\n\
1349 -m11/45                 same as -mkb11\n\
1350 -m11/50                 same as -mkb11\n\
1351 -m11/53                 same as -mj11\n\
1352 -m11/55                 same as -mkb11\n\
1353 -m11/60                 same as -mkd11k\n\
1354 -m11/70                 same as -mkb11\n\
1355 -m11/73                 same as -mj11\n\
1356 -m11/83                 same as -mj11\n\
1357 -m11/84                 same as -mj11\n\
1358 -m11/93                 same as -mj11\n\
1359 -m11/94                 same as -mj11\n\
1360 ");
1361 }
1362
1363 symbolS *
1364 md_undefined_symbol (char *name ATTRIBUTE_UNUSED)
1365 {
1366   return 0;
1367 }
1368
1369 valueT
1370 md_section_align (segT segment ATTRIBUTE_UNUSED,
1371                   valueT size)
1372 {
1373   return (size + 1) & ~1;
1374 }
1375
1376 long
1377 md_pcrel_from (fixS *fixP)
1378 {
1379   return fixP->fx_frag->fr_address + fixP->fx_where + fixP->fx_size;
1380 }
1381
1382 /* Translate internal representation of relocation info to BFD target
1383    format.  */
1384
1385 arelent *
1386 tc_gen_reloc (asection *section ATTRIBUTE_UNUSED,
1387               fixS *fixp)
1388 {
1389   arelent *reloc;
1390   bfd_reloc_code_real_type code;
1391
1392   reloc = xmalloc (sizeof (* reloc));
1393
1394   reloc->sym_ptr_ptr = xmalloc (sizeof (asymbol *));
1395   *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
1396   reloc->address = fixp->fx_frag->fr_address + fixp->fx_where;
1397
1398   /* This is taken account for in md_apply_fix().  */
1399   reloc->addend = -symbol_get_bfdsym (fixp->fx_addsy)->section->vma;
1400
1401   switch (fixp->fx_r_type)
1402     {
1403     case BFD_RELOC_16:
1404       if (fixp->fx_pcrel)
1405         code = BFD_RELOC_16_PCREL;
1406       else
1407         code = BFD_RELOC_16;
1408       break;
1409
1410     case BFD_RELOC_16_PCREL:
1411       code = BFD_RELOC_16_PCREL;
1412       break;
1413
1414     default:
1415       BAD_CASE (fixp->fx_r_type);
1416       return NULL;
1417     }
1418
1419   reloc->howto = bfd_reloc_type_lookup (stdoutput, code);
1420
1421   if (reloc->howto == NULL)
1422     {
1423       as_bad_where (fixp->fx_file, fixp->fx_line,
1424                     _("Can not represent %s relocation in this object file format"),
1425                     bfd_get_reloc_code_name (code));
1426       return NULL;
1427     }
1428
1429   return reloc;
1430 }
1431
1432 void
1433 pseudo_bss (int c ATTRIBUTE_UNUSED)
1434 {
1435   int temp;
1436
1437   temp = get_absolute_expression ();
1438   subseg_set (bss_section, temp);
1439   demand_empty_rest_of_line ();
1440 }
1441
1442 void
1443 pseudo_even (int c ATTRIBUTE_UNUSED)
1444 {
1445   int alignment = 1; /* 2^1 */
1446   frag_align (alignment, 0, 1);
1447   record_alignment (now_seg, alignment);
1448 }
1449
1450 char *
1451 md_atof (int type, char * litP, int * sizeP)
1452 {
1453   return vax_md_atof (type, litP, sizeP);
1454 }