gas/config/tc-pdp11.c

   1 /* tc-pdp11.c - pdp11-specific -
   2    Copyright (C) 2001-2021 Free Software Foundation, Inc.
   3
   4    This file is part of GAS, the GNU Assembler.
   5
   6    GAS is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3, or (at your option)
   9    any later version.
  10
  11    GAS is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with GAS; see the file COPYING.  If not, write to
  18    the Free Software Foundation, 51 Franklin Street - Fifth Floor,
  19    Boston, MA 02110-1301, USA.  */
  20
  21 #include "as.h"
  22 #include "safe-ctype.h"
  23 #include "opcode/pdp11.h"
  24
  25 extern int flonum_gen2vax (int, FLONUM_TYPE * f, LITTLENUM_TYPE *);
  26
  27 #define TRUE  1
  28 #define FALSE 0
  29
  30 /* A representation for PDP-11 machine code.  */
  31 struct pdp11_code
  32 {
  33   const char *error;
  34   int code;
  35   int additional;       /* Is there an additional word?  */
  36   int word;             /* Additional word, if any.  */
  37   struct
  38   {
  39     bfd_reloc_code_real_type type;
  40     expressionS exp;
  41     int pc_rel;
  42   } reloc;
  43 };
  44
  45 /* Instruction set extensions.
  46
  47    If you change this from an array to something else, please update
  48    the "PDP-11 instruction set extensions" comment in pdp11.h.  */
  49 int pdp11_extension[PDP11_EXT_NUM];
  50
  51 /* Assembly options.  */
  52
  53 #define ASM_OPT_PIC 1
  54 #define ASM_OPT_NUM 2
  55
  56 int asm_option[ASM_OPT_NUM];
  57
  58 /* These chars start a comment anywhere in a source file (except inside
  59    another comment.  */
  60 const char comment_chars[] = "#/";
  61
  62 /* These chars only start a comment at the beginning of a line.  */
  63 const char line_comment_chars[] = "#/";
  64
  65 const char line_separator_chars[] = ";";
  66
  67 /* Chars that can be used to separate mant from exp in floating point nums.  */
  68 const char EXP_CHARS[] = "eE";
  69
  70 /* Chars that mean this number is a floating point constant.  */
  71 /* as in 0f123.456.  */
  72 /* or    0H1.234E-12 (see exp chars above).  */
  73 const char FLT_CHARS[] = "dDfF";
  74
  75 void pseudo_even (int);
  76 void pseudo_bss (int);
  77
  78 const pseudo_typeS md_pseudo_table[] =
  79 {
  80   { "bss", pseudo_bss, 0 },
  81   { "even", pseudo_even, 0 },
  82   { 0, 0, 0 },
  83 };
  84
  85 static htab_t insn_hash = NULL;
  86 \f
  87 static int
  88 set_option (const char *arg)
  89 {
  90   int yes = 1;
  91
  92   if (strcmp (arg, "all-extensions") == 0
  93       || strcmp (arg, "all") == 0)
  94     {
  95       memset (pdp11_extension, ~0, sizeof pdp11_extension);
  96       pdp11_extension[PDP11_NONE] = 0;
  97       return 1;
  98     }
  99   else if (strcmp (arg, "no-extensions") == 0)
 100     {
 101       memset (pdp11_extension, 0, sizeof pdp11_extension);
 102       pdp11_extension[PDP11_BASIC] = 1;
 103       return 1;
 104     }
 105
 106   if (strncmp (arg, "no-", 3) == 0)
 107     {
 108       yes = 0;
 109       arg += 3;
 110     }
 111
 112   /* Commercial instructions.  */
 113   if (strcmp (arg, "cis") == 0)
 114     pdp11_extension[PDP11_CIS] = yes;
 115   /* Call supervisor mode.  */
 116   else if (strcmp (arg, "csm") == 0)
 117     pdp11_extension[PDP11_CSM] = yes;
 118   /* Extended instruction set.  */
 119   else if (strcmp (arg, "eis") == 0)
 120     pdp11_extension[PDP11_EIS] = pdp11_extension[PDP11_LEIS] = yes;
 121   /* KEV11 floating-point.  */
 122   else if (strcmp (arg, "fis") == 0
 123            || strcmp (arg, "kev11") == 0
 124            || strcmp (arg, "kev-11") == 0)
 125     pdp11_extension[PDP11_FIS] = yes;
 126   /* FP-11 floating-point.  */
 127   else if (strcmp (arg, "fpp") == 0
 128            || strcmp (arg, "fpu") == 0
 129            || strcmp (arg, "fp11") == 0
 130            || strcmp (arg, "fp-11") == 0
 131            || strcmp (arg, "fpj11") == 0
 132            || strcmp (arg, "fp-j11") == 0
 133            || strcmp (arg, "fpj-11") == 0)
 134     pdp11_extension[PDP11_FPP] = yes;
 135   /* Limited extended insns.  */
 136   else if (strcmp (arg, "limited-eis") == 0)
 137     {
 138       pdp11_extension[PDP11_LEIS] = yes;
 139       if (!pdp11_extension[PDP11_LEIS])
 140         pdp11_extension[PDP11_EIS] = 0;
 141     }
 142   /* Move from processor type.  */
 143   else if (strcmp (arg, "mfpt") == 0)
 144     pdp11_extension[PDP11_MFPT] = yes;
 145   /* Multiprocessor insns:  */
 146   else if (strncmp (arg, "mproc", 5) == 0
 147            /* TSTSET, WRTLCK */
 148            || strncmp (arg, "multiproc", 9) == 0)
 149     pdp11_extension[PDP11_MPROC] = yes;
 150   /* Move from/to proc status.  */
 151   else if (strcmp (arg, "mxps") == 0)
 152     pdp11_extension[PDP11_MXPS] = yes;
 153   /* Position-independent code.  */
 154   else if (strcmp (arg, "pic") == 0)
 155     asm_option[ASM_OPT_PIC] = yes;
 156   /* Set priority level.  */
 157   else if (strcmp (arg, "spl") == 0)
 158     pdp11_extension[PDP11_SPL] = yes;
 159   /* Microcode instructions:  */
 160   else if (strcmp (arg, "ucode") == 0
 161            /* LDUB, MED, XFC */
 162            || strcmp (arg, "microcode") == 0)
 163     pdp11_extension[PDP11_UCODE] = yes;
 164   else
 165     return 0;
 166
 167   return 1;
 168 }
 169
 170
 171 static void
 172 init_defaults (void)
 173 {
 174   static int first = 1;
 175
 176   if (first)
 177     {
 178       set_option ("all-extensions");
 179       set_option ("pic");
 180       first = 0;
 181     }
 182 }
 183
 184 void
 185 md_begin (void)
 186 {
 187   int i;
 188
 189   init_defaults ();
 190
 191   insn_hash = str_htab_create ();
 192
 193   for (i = 0; i < pdp11_num_opcodes; i++)
 194     str_hash_insert (insn_hash, pdp11_opcodes[i].name, pdp11_opcodes + i, 0);
 195   for (i = 0; i < pdp11_num_aliases; i++)
 196     str_hash_insert (insn_hash, pdp11_aliases[i].name, pdp11_aliases + i, 0);
 197 }
 198
 199 void
 200 md_number_to_chars (char con[], valueT value, int nbytes)
 201 {
 202   /* On a PDP-11, 0x1234 is stored as "\x12\x34", and
 203      0x12345678 is stored as "\x56\x78\x12\x34". It's
 204      anyone's guess what 0x123456 would be stored like.  */
 205
 206   switch (nbytes)
 207     {
 208     case 0:
 209       break;
 210     case 1:
 211       con[0] =  value       & 0xff;
 212       break;
 213     case 2:
 214       con[0] =  value        & 0xff;
 215       con[1] = (value >>  8) & 0xff;
 216       break;
 217     case 4:
 218       con[0] = (value >> 16) & 0xff;
 219       con[1] = (value >> 24) & 0xff;
 220       con[2] =  value        & 0xff;
 221       con[3] = (value >>  8) & 0xff;
 222       break;
 223 #ifdef BFD64
 224     case 8:
 225       con[0] = (value >> 48) & 0xff;
 226       con[1] = (value >> 56) & 0xff;
 227       con[2] = (value >> 32) & 0xff;
 228       con[3] = (value >> 40) & 0xff;
 229       con[4] = (value >> 16) & 0xff;
 230       con[5] = (value >> 24) & 0xff;
 231       con[6] =  value        & 0xff;
 232       con[7] = (value >>  8) & 0xff;
 233       break;
 234 #endif
 235     default:
 236       BAD_CASE (nbytes);
 237     }
 238 }
 239
 240 /* Fix up some data or instructions after we find out the value of a symbol
 241    that they reference.  Knows about order of bytes in address.  */
 242
 243 void
 244 md_apply_fix (fixS *fixP,
 245                valueT * valP,
 246                segT seg ATTRIBUTE_UNUSED)
 247 {
 248   valueT code;
 249   valueT mask;
 250   valueT val = * valP;
 251   char *buf;
 252   int shift;
 253   int size;
 254
 255   buf = fixP->fx_where + fixP->fx_frag->fr_literal;
 256   size = fixP->fx_size;
 257   code = md_chars_to_number ((unsigned char *) buf, size);
 258
 259   switch (fixP->fx_r_type)
 260     {
 261     case BFD_RELOC_8:
 262       mask = 0xff;
 263       shift = 0;
 264       break;
 265     case BFD_RELOC_16:
 266     case BFD_RELOC_16_PCREL:
 267       mask = 0xffff;
 268       shift = 0;
 269       break;
 270     case BFD_RELOC_32:
 271       mask = 0xffffffff;
 272       shift = 0;
 273       break;
 274     case BFD_RELOC_PDP11_DISP_8_PCREL:
 275       mask = 0x00ff;
 276       shift = 1;
 277       break;
 278     case BFD_RELOC_PDP11_DISP_6_PCREL:
 279       mask = 0x003f;
 280       shift = 1;
 281       val = -val;
 282       break;
 283     default:
 284       BAD_CASE (fixP->fx_r_type);
 285     }
 286
 287   if (fixP->fx_addsy != NULL)
 288     val += symbol_get_bfdsym (fixP->fx_addsy)->section->vma;
 289     /* *value += fixP->fx_addsy->bsym->section->vma; */
 290
 291   code &= ~mask;
 292   code |= (val >> shift) & mask;
 293   number_to_chars_littleendian (buf, code, size);
 294
 295   if (fixP->fx_addsy == NULL && fixP->fx_pcrel == 0)
 296     fixP->fx_done = 1;
 297 }
 298
 299 long
 300 md_chars_to_number (unsigned char *con, int nbytes)
 301 {
 302   /* On a PDP-11, 0x1234 is stored as "\x12\x34", and
 303      0x12345678 is stored as "\x56\x78\x12\x34". It's
 304      anyone's guess what 0x123456 would be stored like.  */
 305   switch (nbytes)
 306     {
 307     case 0:
 308       return 0;
 309     case 1:
 310       return con[0];
 311     case 2:
 312       return (con[1] << BITS_PER_CHAR) | con[0];
 313     case 4:
 314       return
 315         (((con[1] << BITS_PER_CHAR) | con[0]) << (2 * BITS_PER_CHAR))
 316         |((con[3] << BITS_PER_CHAR) | con[2]);
 317     default:
 318       BAD_CASE (nbytes);
 319       return 0;
 320     }
 321 }
 322 \f
 323 static char *
 324 skip_whitespace (char *str)
 325 {
 326   while (*str == ' ' || *str == '\t')
 327     str++;
 328   return str;
 329 }
 330
 331 static char *
 332 find_whitespace (char *str)
 333 {
 334   while (*str != ' ' && *str != '\t' && *str != 0)
 335     str++;
 336   return str;
 337 }
 338
 339 static char *
 340 parse_reg (char *str, struct pdp11_code *operand)
 341 {
 342   str = skip_whitespace (str);
 343   if (TOLOWER (*str) == 'r')
 344     {
 345       str++;
 346       switch (*str)
 347         {
 348         case '0': case '1': case '2': case '3':
 349         case '4': case '5': case '6': case '7':
 350           operand->code = *str - '0';
 351           str++;
 352           break;
 353         default:
 354           operand->error = _("Bad register name");
 355           return str - 1;
 356         }
 357     }
 358   else if (strncmp (str, "sp", 2) == 0
 359            || strncmp (str, "SP", 2) == 0)
 360     {
 361       operand->code = 6;
 362       str += 2;
 363     }
 364   else if (strncmp (str, "pc", 2) == 0
 365            || strncmp (str, "PC", 2) == 0)
 366     {
 367       operand->code = 7;
 368       str += 2;
 369     }
 370   else
 371     {
 372       operand->error = _("Bad register name");
 373       return str;
 374     }
 375
 376   if (ISALNUM (*str) || *str == '_' || *str == '.')
 377     {
 378       operand->error = _("Bad register name");
 379       str -= 2;
 380     }
 381
 382   return str;
 383 }
 384
 385 static char *
 386 parse_ac5 (char *str, struct pdp11_code *operand)
 387 {
 388   str = skip_whitespace (str);
 389   if (strncmp (str, "fr", 2) == 0
 390       || strncmp (str, "FR", 2) == 0
 391       || strncmp (str, "ac", 2) == 0
 392       || strncmp (str, "AC", 2) == 0)
 393     {
 394       str += 2;
 395       switch (*str)
 396         {
 397         case '0': case '1': case '2': case '3':
 398         case '4': case '5':
 399           operand->code = *str - '0';
 400           str++;
 401           break;
 402         default:
 403           operand->error = _("Bad register name");
 404           return str - 2;
 405         }
 406     }
 407   else
 408     {
 409       operand->error = _("Bad register name");
 410       return str;
 411     }
 412
 413   return str;
 414 }
 415
 416 static char *
 417 parse_ac (char *str, struct pdp11_code *operand)
 418 {
 419   str = parse_ac5 (str, operand);
 420   if (!operand->error && operand->code > 3)
 421     {
 422       operand->error = _("Bad register name");
 423           return str - 3;
 424     }
 425
 426   return str;
 427 }
 428
 429 static char *
 430 parse_expression (char *str, struct pdp11_code *operand)
 431 {
 432   char *save_input_line_pointer;
 433   segT seg;
 434
 435   save_input_line_pointer = input_line_pointer;
 436   input_line_pointer = str;
 437   seg = expression (&operand->reloc.exp);
 438   if (seg == NULL)
 439     {
 440       input_line_pointer = save_input_line_pointer;
 441       operand->error = _("Error in expression");
 442       return str;
 443     }
 444
 445   str = input_line_pointer;
 446   input_line_pointer = save_input_line_pointer;
 447
 448   operand->reloc.pc_rel = 0;
 449
 450   return str;
 451 }
 452
 453 static char *
 454 parse_op_no_deferred (char *str, struct pdp11_code *operand)
 455 {
 456   LITTLENUM_TYPE literal_float[2];
 457
 458   str = skip_whitespace (str);
 459
 460   switch (*str)
 461     {
 462     case '(':                           /* (rn) and (rn)+ */
 463       str = parse_reg (str + 1, operand);
 464       if (operand->error)
 465         return str;
 466       str = skip_whitespace (str);
 467       if (*str != ')')
 468         {
 469           operand->error = _("Missing ')'");
 470           return str;
 471         }
 472       str++;
 473       if (*str == '+')
 474         {
 475           operand->code |= 020;
 476           str++;
 477         }
 478       else
 479         {
 480           operand->code |= 010;
 481         }
 482       break;
 483
 484       /* Immediate.  */
 485     case '#':
 486     case '$':
 487       str = parse_expression (str + 1, operand);
 488       if (operand->error)
 489         return str;
 490       operand->additional = TRUE;
 491       operand->word = operand->reloc.exp.X_add_number;
 492       switch (operand->reloc.exp.X_op)
 493         {
 494         case O_constant:
 495           break;
 496         case O_symbol:
 497         case O_add:
 498         case O_subtract:
 499           operand->reloc.type = BFD_RELOC_16;
 500           operand->reloc.pc_rel = 0;
 501           break;
 502         case O_big:
 503           if (operand->reloc.exp.X_add_number > 0)
 504             {
 505               operand->error = _("Error in expression");
 506               break;
 507             }
 508           /* It's a floating literal...  */
 509           know (operand->reloc.exp.X_add_number < 0);
 510           flonum_gen2vax ('f', &generic_floating_point_number, literal_float);
 511           operand->word = literal_float[0];
 512           if (literal_float[1] != 0)
 513             as_warn (_("Low order bits truncated in immediate float operand"));
 514           break;
 515         default:
 516           operand->error = _("Error in expression");
 517           break;
 518         }
 519       operand->code = 027;
 520       break;
 521
 522       /* label, d(rn), -(rn)  */
 523     default:
 524       {
 525         if (strncmp (str, "-(", 2) == 0)        /* -(rn) */
 526           {
 527             str = parse_reg (str + 2, operand);
 528             if (operand->error)
 529               return str;
 530             str = skip_whitespace (str);
 531             if (*str != ')')
 532               {
 533                 operand->error = _("Missing ')'");
 534                 return str;
 535               }
 536             operand->code |= 040;
 537             str++;
 538             break;
 539           }
 540
 541         str = parse_expression (str, operand);
 542         if (operand->error)
 543           return str;
 544
 545         str = skip_whitespace (str);
 546
 547         if (*str != '(')
 548           {
 549             operand->code = 067;
 550             operand->additional = 1;
 551             operand->word = 0;
 552             operand->reloc.type = BFD_RELOC_16_PCREL;
 553             operand->reloc.pc_rel = 1;
 554             break;
 555           }
 556
 557         /* d(rn) */
 558         str++;
 559         str = parse_reg (str, operand);
 560         if (operand->error)
 561           return str;
 562
 563         str = skip_whitespace (str);
 564
 565         if (*str != ')')
 566           {
 567             operand->error = _("Missing ')'");
 568             return str;
 569           }
 570
 571         str++;
 572         operand->additional = TRUE;
 573         operand->code |= 060;
 574         switch (operand->reloc.exp.X_op)
 575           {
 576           case O_symbol:
 577             operand->reloc.type = BFD_RELOC_16;
 578             operand->reloc.pc_rel = 0;
 579             break;
 580           case O_constant:
 581             if ((operand->code & 7) == 7)
 582               {
 583                 operand->reloc.pc_rel = 1;
 584                 operand->word = operand->reloc.exp.X_add_number;
 585               }
 586             else
 587               operand->word = operand->reloc.exp.X_add_number;
 588
 589             break;
 590           default:
 591             BAD_CASE (operand->reloc.exp.X_op);
 592           }
 593         break;
 594       }
 595     }
 596
 597   return str;
 598 }
 599
 600 static char *
 601 parse_op_noreg (char *str, struct pdp11_code *operand)
 602 {
 603   str = skip_whitespace (str);
 604   operand->error = NULL;
 605
 606   if (*str == '@' || *str == '*')
 607     {
 608       /* @(Rn) == @0(Rn): Mode 7, Indexed deferred.
 609          Check for auto-increment deferred.  */
 610       if (str[1] == '('
 611           && str[2] != 0
 612           && str[3] != 0
 613           && str[4] != 0
 614           && str[5] != '+')
 615         {
 616           /* Change implied to explicit index deferred.  */
 617           *str = '0';
 618           str = parse_op_no_deferred (str, operand);
 619         }
 620       else
 621         {
 622           /* @Rn == (Rn): Register deferred.  */
 623           str = parse_reg (str + 1, operand);
 624
 625           /* Not @Rn */
 626           if (operand->error)
 627             {
 628               operand->error = NULL;
 629               str = parse_op_no_deferred (str, operand);
 630             }
 631         }
 632
 633       if (operand->error)
 634         return str;
 635
 636       operand->code |= 010;
 637     }
 638   else
 639     str = parse_op_no_deferred (str, operand);
 640
 641   return str;
 642 }
 643
 644 static char *
 645 parse_op (char *str, struct pdp11_code *operand)
 646 {
 647   str = skip_whitespace (str);
 648
 649   str = parse_reg (str, operand);
 650   if (!operand->error)
 651     return str;
 652
 653   operand->error = NULL;
 654   parse_ac5 (str, operand);
 655   if (!operand->error)
 656     {
 657       operand->error = _("Float AC not legal as integer operand");
 658       return str;
 659     }
 660
 661   return parse_op_noreg (str, operand);
 662 }
 663
 664 static char *
 665 parse_fop (char *str, struct pdp11_code *operand)
 666 {
 667   str = skip_whitespace (str);
 668
 669   str = parse_ac5 (str, operand);
 670   if (!operand->error)
 671     return str;
 672
 673   operand->error = NULL;
 674   parse_reg (str, operand);
 675   if (!operand->error)
 676     {
 677       operand->error = _("General register not legal as float operand");
 678       return str;
 679     }
 680
 681   return parse_op_noreg (str, operand);
 682 }
 683
 684 static char *
 685 parse_separator (char *str, int *error)
 686 {
 687   str = skip_whitespace (str);
 688   *error = (*str != ',');
 689   if (!*error)
 690     str++;
 691   return str;
 692 }
 693
 694 void
 695 md_assemble (char *instruction_string)
 696 {
 697   const struct pdp11_opcode *op;
 698   struct pdp11_code insn, op1, op2;
 699   int error;
 700   int size;
 701   const char *err = NULL;
 702   char *str;
 703   char *p;
 704   char c;
 705
 706   str = skip_whitespace (instruction_string);
 707   p = find_whitespace (str);
 708   if (p - str == 0)
 709     {
 710       as_bad (_("No instruction found"));
 711       return;
 712     }
 713
 714   c = *p;
 715   *p = '\0';
 716   op = (struct pdp11_opcode *)str_hash_find (insn_hash, str);
 717   *p = c;
 718   if (op == 0)
 719     {
 720       as_bad (_("Unknown instruction '%s'"), str);
 721       return;
 722     }
 723
 724   if (!pdp11_extension[op->extension])
 725     {
 726       as_warn (_("Unsupported instruction set extension: %s"), op->name);
 727       return;
 728     }
 729
 730   insn.error = NULL;
 731   insn.code = op->opcode;
 732   insn.reloc.type = BFD_RELOC_NONE;
 733   op1.error = NULL;
 734   op1.additional = FALSE;
 735   op1.reloc.type = BFD_RELOC_NONE;
 736   op2.error = NULL;
 737   op2.additional = FALSE;
 738   op2.reloc.type = BFD_RELOC_NONE;
 739
 740   str = p;
 741   size = 2;
 742
 743   switch (op->type)
 744     {
 745     case PDP11_OPCODE_NO_OPS:
 746       str = skip_whitespace (str);
 747       break;
 748
 749     case PDP11_OPCODE_IMM3:
 750     case PDP11_OPCODE_IMM6:
 751     case PDP11_OPCODE_IMM8:
 752       str = skip_whitespace (str);
 753       if (*str == '#' || *str == '$')
 754         str++;
 755       str = parse_expression (str, &op1);
 756       if (op1.error)
 757         break;
 758       if (op1.reloc.exp.X_op != O_constant || op1.reloc.type != BFD_RELOC_NONE)
 759         {
 760           op1.error = _("operand is not an absolute constant");
 761           break;
 762         }
 763       switch (op->type)
 764         {
 765         case PDP11_OPCODE_IMM3:
 766           if (op1.reloc.exp.X_add_number & ~7)
 767             {
 768               op1.error = _("3-bit immediate out of range");
 769               break;
 770             }
 771           break;
 772         case PDP11_OPCODE_IMM6:
 773           if (op1.reloc.exp.X_add_number & ~0x3f)
 774             {
 775               op1.error = _("6-bit immediate out of range");
 776               break;
 777             }
 778           break;
 779         case PDP11_OPCODE_IMM8:
 780           if (op1.reloc.exp.X_add_number & ~0xff)
 781             {
 782               op1.error = _("8-bit immediate out of range");
 783               break;
 784             }
 785           break;
 786         }
 787       insn.code |= op1.reloc.exp.X_add_number;
 788       break;
 789
 790     case PDP11_OPCODE_DISPL:
 791       {
 792         char *new_pointer;
 793         new_pointer = parse_expression (str, &op1);
 794         op1.code = 0;
 795         op1.reloc.pc_rel = 1;
 796         op1.reloc.type = BFD_RELOC_PDP11_DISP_8_PCREL;
 797         if (op1.reloc.exp.X_op != O_symbol)
 798           {
 799             op1.error = _("Symbol expected");
 800             break;
 801           }
 802         if (op1.code & ~0xff)
 803           {
 804             err = _("8-bit displacement out of range");
 805             break;
 806           }
 807         str = new_pointer;
 808         insn.code |= op1.code;
 809         insn.reloc = op1.reloc;
 810       }
 811       break;
 812
 813     case PDP11_OPCODE_REG:
 814       str = parse_reg (str, &op1);
 815       if (op1.error)
 816         break;
 817       insn.code |= op1.code;
 818       break;
 819
 820     case PDP11_OPCODE_OP:
 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       break;
 828
 829     case PDP11_OPCODE_FOP:
 830       str = parse_fop (str, &op1);
 831       if (op1.error)
 832         break;
 833       insn.code |= op1.code;
 834       if (op1.additional)
 835         size += 2;
 836       break;
 837
 838     case PDP11_OPCODE_REG_OP:
 839       str = parse_reg (str, &op2);
 840       if (op2.error)
 841         break;
 842       insn.code |= op2.code << 6;
 843       str = parse_separator (str, &error);
 844       if (error)
 845         {
 846           op2.error = _("Missing ','");
 847           break;
 848         }
 849       str = parse_op (str, &op1);
 850       if (op1.error)
 851         break;
 852       insn.code |= op1.code;
 853       if (op1.additional)
 854         size += 2;
 855       break;
 856
 857     case PDP11_OPCODE_REG_OP_REV:
 858       str = parse_op (str, &op1);
 859       if (op1.error)
 860         break;
 861       insn.code |= op1.code;
 862       if (op1.additional)
 863         size += 2;
 864       str = parse_separator (str, &error);
 865       if (error)
 866         {
 867           op2.error = _("Missing ','");
 868           break;
 869         }
 870       str = parse_reg (str, &op2);
 871       if (op2.error)
 872         break;
 873       insn.code |= op2.code << 6;
 874       break;
 875
 876     case PDP11_OPCODE_AC_FOP:
 877       str = parse_ac (str, &op2);
 878       if (op2.error)
 879         break;
 880       insn.code |= op2.code << 6;
 881       str = parse_separator (str, &error);
 882       if (error)
 883         {
 884           op1.error = _("Missing ','");
 885           break;
 886         }
 887       str = parse_fop (str, &op1);
 888       if (op1.error)
 889         break;
 890       insn.code |= op1.code;
 891       if (op1.additional)
 892         size += 2;
 893       break;
 894
 895     case PDP11_OPCODE_FOP_AC:
 896       str = parse_fop (str, &op1);
 897       if (op1.error)
 898         break;
 899       insn.code |= op1.code;
 900       if (op1.additional)
 901         size += 2;
 902       str = parse_separator (str, &error);
 903       if (error)
 904         {
 905           op1.error = _("Missing ','");
 906           break;
 907         }
 908       str = parse_ac (str, &op2);
 909       if (op2.error)
 910         break;
 911       insn.code |= op2.code << 6;
 912       break;
 913
 914     case PDP11_OPCODE_AC_OP:
 915       str = parse_ac (str, &op2);
 916       if (op2.error)
 917         break;
 918       insn.code |= op2.code << 6;
 919       str = parse_separator (str, &error);
 920       if (error)
 921         {
 922           op1.error = _("Missing ','");
 923           break;
 924         }
 925       str = parse_op (str, &op1);
 926       if (op1.error)
 927         break;
 928       insn.code |= op1.code;
 929       if (op1.additional)
 930         size += 2;
 931       break;
 932
 933     case PDP11_OPCODE_OP_AC:
 934       str = parse_op (str, &op1);
 935       if (op1.error)
 936         break;
 937       insn.code |= op1.code;
 938       if (op1.additional)
 939         size += 2;
 940       str = parse_separator (str, &error);
 941       if (error)
 942         {
 943           op1.error = _("Missing ','");
 944           break;
 945         }
 946       str = parse_ac (str, &op2);
 947       if (op2.error)
 948         break;
 949       insn.code |= op2.code << 6;
 950       break;
 951
 952     case PDP11_OPCODE_OP_OP:
 953       str = parse_op (str, &op1);
 954       if (op1.error)
 955         break;
 956       insn.code |= op1.code << 6;
 957       if (op1.additional)
 958         size += 2;
 959       str = parse_separator (str, &error);
 960       if (error)
 961         {
 962           op2.error = _("Missing ','");
 963           break;
 964         }
 965       str = parse_op (str, &op2);
 966       if (op2.error)
 967         break;
 968       insn.code |= op2.code;
 969       if (op2.additional)
 970         size += 2;
 971       break;
 972
 973     case PDP11_OPCODE_REG_DISPL:
 974       {
 975         char *new_pointer;
 976         str = parse_reg (str, &op2);
 977         if (op2.error)
 978           break;
 979         insn.code |= op2.code << 6;
 980         str = parse_separator (str, &error);
 981         if (error)
 982           {
 983             op1.error = _("Missing ','");
 984             break;
 985           }
 986         new_pointer = parse_expression (str, &op1);
 987         op1.code = 0;
 988         op1.reloc.pc_rel = 1;
 989         op1.reloc.type = BFD_RELOC_PDP11_DISP_6_PCREL;
 990         if (op1.reloc.exp.X_op != O_symbol)
 991           {
 992             op1.error = _("Symbol expected");
 993             break;
 994           }
 995         if (op1.code & ~0x3f)
 996           {
 997             err = _("6-bit displacement out of range");
 998             break;
 999           }
1000         str = new_pointer;
1001         insn.code |= op1.code;
1002         insn.reloc = op1.reloc;
1003       }
1004       break;
1005
1006     default:
1007       BAD_CASE (op->type);
1008     }
1009
1010   if (op1.error)
1011     err = op1.error;
1012   else if (op2.error)
1013     err = op2.error;
1014   else
1015     {
1016       str = skip_whitespace (str);
1017       if (*str)
1018         err = _("Too many operands");
1019     }
1020
1021   {
1022     char *to = NULL;
1023
1024     if (err)
1025       {
1026         as_bad ("%s", err);
1027         return;
1028       }
1029
1030     to = frag_more (size);
1031
1032     md_number_to_chars (to, insn.code, 2);
1033     if (insn.reloc.type != BFD_RELOC_NONE)
1034       fix_new_exp (frag_now, to - frag_now->fr_literal, 2,
1035                    &insn.reloc.exp, insn.reloc.pc_rel, insn.reloc.type);
1036     to += 2;
1037
1038     if (op1.additional)
1039       {
1040         md_number_to_chars (to, op1.word, 2);
1041         if (op1.reloc.type != BFD_RELOC_NONE)
1042           fix_new_exp (frag_now, to - frag_now->fr_literal, 2,
1043                        &op1.reloc.exp, op1.reloc.pc_rel, op1.reloc.type);
1044         to += 2;
1045       }
1046
1047     if (op2.additional)
1048       {
1049         md_number_to_chars (to, op2.word, 2);
1050         if (op2.reloc.type != BFD_RELOC_NONE)
1051           fix_new_exp (frag_now, to - frag_now->fr_literal, 2,
1052                        &op2.reloc.exp, op2.reloc.pc_rel, op2.reloc.type);
1053       }
1054   }
1055 }
1056
1057 int
1058 md_estimate_size_before_relax (fragS *fragP ATTRIBUTE_UNUSED,
1059                                segT segment ATTRIBUTE_UNUSED)
1060 {
1061   return 0;
1062 }
1063
1064 void
1065 md_convert_frag (bfd *headers ATTRIBUTE_UNUSED,
1066                  segT seg ATTRIBUTE_UNUSED,
1067                  fragS *fragP ATTRIBUTE_UNUSED)
1068 {
1069 }
1070
1071 int md_short_jump_size = 2;
1072 int md_long_jump_size = 4;
1073
1074 void
1075 md_create_short_jump (char *ptr ATTRIBUTE_UNUSED,
1076                       addressT from_addr ATTRIBUTE_UNUSED,
1077                       addressT to_addr ATTRIBUTE_UNUSED,
1078                       fragS *frag ATTRIBUTE_UNUSED,
1079                       symbolS *to_symbol ATTRIBUTE_UNUSED)
1080 {
1081 }
1082
1083 void
1084 md_create_long_jump (char *ptr ATTRIBUTE_UNUSED,
1085                      addressT from_addr ATTRIBUTE_UNUSED,
1086                      addressT to_addr ATTRIBUTE_UNUSED,
1087                      fragS *frag ATTRIBUTE_UNUSED,
1088                      symbolS *to_symbol ATTRIBUTE_UNUSED)
1089 {
1090 }
1091
1092 static int
1093 set_cpu_model (const char *arg)
1094 {
1095   char buf[4];
1096   char *model = buf;
1097
1098   if (arg[0] == 'k')
1099     arg++;
1100
1101   *model++ = *arg++;
1102
1103   if (strchr ("abdx", model[-1]) == NULL)
1104     return 0;
1105
1106   if (model[-1] == 'd')
1107     {
1108       if (arg[0] == 'f' || arg[0] == 'j')
1109         model[-1] = *arg++;
1110     }
1111   else if (model[-1] == 'x')
1112     {
1113       if (arg[0] == 't')
1114         model[-1] = *arg++;
1115     }
1116
1117   if (arg[0] == '-')
1118     arg++;
1119
1120   if (strncmp (arg, "11", 2) != 0)
1121     return 0;
1122   arg += 2;
1123
1124   if (arg[0] == '-')
1125     {
1126       if (*++arg == 0)
1127         return 0;
1128     }
1129
1130   /* Allow up to two revision letters.  */
1131   if (arg[0] != 0)
1132     *model++ = *arg++;
1133   if (arg[0] != 0)
1134     *model++ = *arg++;
1135
1136   *model++ = 0;
1137
1138   set_option ("no-extensions");
1139
1140   /* KA11 (11/15/20).  */
1141   if (strncmp (buf, "a", 1) == 0)
1142     return 1; /* No extensions.  */
1143
1144   /* KB11 (11/45/50/55/70).  */
1145   else if (strncmp (buf, "b", 1) == 0)
1146     return set_option ("eis") && set_option ("spl");
1147
1148   /* KD11-A (11/35/40).  */
1149   else if (strncmp (buf, "da", 2) == 0)
1150     return set_option ("limited-eis");
1151
1152   /* KD11-B (11/05/10).  */
1153   else if (strncmp (buf, "db", 2) == 0
1154            /* KD11-D (11/04).  */
1155            || strncmp (buf, "dd", 2) == 0)
1156     return 1; /* no extensions */
1157
1158   /* KD11-E (11/34).  */
1159   else if (strncmp (buf, "de", 2) == 0)
1160     return set_option ("eis") && set_option ("mxps");
1161
1162   /* KD11-F (11/03).  */
1163   else if (strncmp (buf, "df", 2) == 0
1164            /* KD11-H (11/03).  */
1165            || strncmp (buf, "dh", 2) == 0
1166            /* KD11-Q (11/03).  */
1167            || strncmp (buf, "dq", 2) == 0)
1168     return set_option ("limited-eis") && set_option ("mxps");
1169
1170   /* KD11-K (11/60).  */
1171   else if (strncmp (buf, "dk", 2) == 0)
1172     return set_option ("eis")
1173       && set_option ("mxps")
1174       && set_option ("ucode");
1175
1176   /* KD11-Z (11/44).  */
1177   else if (strncmp (buf, "dz", 2) == 0)
1178     return set_option ("csm")
1179       && set_option ("eis")
1180       && set_option ("mfpt")
1181       && set_option ("mxps")
1182       && set_option ("spl");
1183
1184   /* F11 (11/23/24).  */
1185   else if (strncmp (buf, "f", 1) == 0)
1186     return set_option ("eis")
1187       && set_option ("mfpt")
1188       && set_option ("mxps");
1189
1190   /* J11 (11/53/73/83/84/93/94).  */
1191   else if (strncmp (buf, "j", 1) == 0)
1192     return set_option ("csm")
1193       && set_option ("eis")
1194       && set_option ("mfpt")
1195       && set_option ("multiproc")
1196       && set_option ("mxps")
1197       && set_option ("spl");
1198
1199   /* T11 (11/21).  */
1200   else if (strncmp (buf, "t", 1) == 0)
1201     return set_option ("limited-eis")
1202       && set_option ("mxps");
1203
1204   else
1205     return 0;
1206 }
1207
1208 static int
1209 set_machine_model (const char *arg)
1210 {
1211   if (strncmp (arg, "pdp-11/", 7) != 0
1212       && strncmp (arg, "pdp11/", 6) != 0
1213       && strncmp (arg, "11/", 3) != 0)
1214     return 0;
1215
1216   if (strncmp (arg, "pdp", 3) == 0)
1217     arg += 3;
1218   if (arg[0] == '-')
1219     arg++;
1220   if (strncmp (arg, "11/", 3) == 0)
1221     arg += 3;
1222
1223   if (strcmp (arg, "03") == 0)
1224     return set_cpu_model ("kd11f");
1225
1226   else if (strcmp (arg, "04") == 0)
1227     return set_cpu_model ("kd11d");
1228
1229   else if (strcmp (arg, "05") == 0
1230            || strcmp (arg, "10") == 0)
1231     return set_cpu_model ("kd11b");
1232
1233   else if (strcmp (arg, "15") == 0
1234            || strcmp (arg, "20") == 0)
1235     return set_cpu_model ("ka11");
1236
1237   else if (strcmp (arg, "21") == 0)
1238     return set_cpu_model ("t11");
1239
1240   else if (strcmp (arg, "23") == 0
1241            || strcmp (arg, "24") == 0)
1242     return set_cpu_model ("f11");
1243
1244   else if (strcmp (arg, "34") == 0
1245            || strcmp (arg, "34a") == 0)
1246     return set_cpu_model ("kd11e");
1247
1248   else if (strcmp (arg, "35") == 0
1249            || strcmp (arg, "40") == 0)
1250     return set_cpu_model ("kd11da");
1251
1252   else if (strcmp (arg, "44") == 0)
1253     return set_cpu_model ("kd11dz");
1254
1255   else if (strcmp (arg, "45") == 0
1256            || strcmp (arg, "50") == 0
1257            || strcmp (arg, "55") == 0
1258            || strcmp (arg, "70") == 0)
1259     return set_cpu_model ("kb11");
1260
1261   else if (strcmp (arg, "60") == 0)
1262     return set_cpu_model ("kd11k");
1263
1264   else if (strcmp (arg, "53") == 0
1265            || strcmp (arg, "73") == 0
1266            || strcmp (arg, "83") == 0
1267            || strcmp (arg, "84") == 0
1268            || strcmp (arg, "93") == 0
1269            || strcmp (arg, "94") == 0)
1270     return set_cpu_model ("j11")
1271       && set_option ("fpp");
1272
1273   else
1274     return 0;
1275 }
1276
1277 const char *md_shortopts = "m:";
1278
1279 struct option md_longopts[] =
1280 {
1281 #define OPTION_CPU 257
1282   { "cpu", required_argument, NULL, OPTION_CPU },
1283 #define OPTION_MACHINE 258
1284   { "machine", required_argument, NULL, OPTION_MACHINE },
1285 #define OPTION_PIC 259
1286   { "pic", no_argument, NULL, OPTION_PIC },
1287   { NULL, no_argument, NULL, 0 }
1288 };
1289
1290 size_t md_longopts_size = sizeof (md_longopts);
1291
1292 /* Invocation line includes a switch not recognized by the base assembler.
1293    See if it's a processor-specific option.  */
1294
1295 int
1296 md_parse_option (int c, const char *arg)
1297 {
1298   init_defaults ();
1299
1300   switch (c)
1301     {
1302     case 'm':
1303       if (set_option (arg))
1304         return 1;
1305       if (set_cpu_model (arg))
1306         return 1;
1307       if (set_machine_model (arg))
1308         return 1;
1309       break;
1310
1311     case OPTION_CPU:
1312       if (set_cpu_model (arg))
1313         return 1;
1314       break;
1315
1316     case OPTION_MACHINE:
1317       if (set_machine_model (arg))
1318         return 1;
1319       break;
1320
1321     case OPTION_PIC:
1322       if (set_option ("pic"))
1323         return 1;
1324       break;
1325
1326     default:
1327       break;
1328     }
1329
1330   return 0;
1331 }
1332
1333 void
1334 md_show_usage (FILE *stream)
1335 {
1336   fprintf (stream, "\
1337 \n\
1338 PDP-11 instruction set extensions:\n\
1339 \n\
1340 -m(no-)cis              allow (disallow) commercial instruction set\n\
1341 -m(no-)csm              allow (disallow) CSM instruction\n\
1342 -m(no-)eis              allow (disallow) full extended instruction set\n\
1343 -m(no-)fis              allow (disallow) KEV11 floating-point instructions\n\
1344 -m(no-)fpp              allow (disallow) FP-11 floating-point instructions\n\
1345 -m(no-)fpu              allow (disallow) FP-11 floating-point instructions\n\
1346 -m(no-)limited-eis      allow (disallow) limited extended instruction set\n\
1347 -m(no-)mfpt             allow (disallow) processor type instruction\n\
1348 -m(no-)multiproc        allow (disallow) multiprocessor instructions\n\
1349 -m(no-)mxps             allow (disallow) processor status instructions\n\
1350 -m(no-)spl              allow (disallow) SPL instruction\n\
1351 -m(no-)ucode            allow (disallow) microcode instructions\n\
1352 -mall-extensions        allow all instruction set extensions\n\
1353                         (this is the default)\n\
1354 -mno-extensions         disallow all instruction set extensions\n\
1355 -pic                    generate position-independent code\n\
1356 \n\
1357 PDP-11 CPU model options:\n\
1358 \n\
1359 -mka11*                 KA11 CPU.  base line instruction set only\n\
1360 -mkb11*                 KB11 CPU.  enable full EIS and SPL\n\
1361 -mkd11a*                KD11-A CPU.  enable limited EIS\n\
1362 -mkd11b*                KD11-B CPU.  base line instruction set only\n\
1363 -mkd11d*                KD11-D CPU.  base line instruction set only\n\
1364 -mkd11e*                KD11-E CPU.  enable full EIS, MTPS, and MFPS\n\
1365 -mkd11f*                KD11-F CPU.  enable limited EIS, MTPS, and MFPS\n\
1366 -mkd11h*                KD11-H CPU.  enable limited EIS, MTPS, and MFPS\n\
1367 -mkd11q*                KD11-Q CPU.  enable limited EIS, MTPS, and MFPS\n\
1368 -mkd11k*                KD11-K CPU.  enable full EIS, MTPS, MFPS, LDUB, MED,\n\
1369                         XFC, and MFPT\n\
1370 -mkd11z*                KD11-Z CPU.  enable full EIS, MTPS, MFPS, MFPT, SPL,\n\
1371                         and CSM\n\
1372 -mf11*                  F11 CPU.  enable full EIS, MFPS, MTPS, and MFPT\n\
1373 -mj11*                  J11 CPU.  enable full EIS, MTPS, MFPS, MFPT, SPL,\n\
1374                         CSM, TSTSET, and WRTLCK\n\
1375 -mt11*                  T11 CPU.  enable limited EIS, MTPS, and MFPS\n\
1376 \n\
1377 PDP-11 machine model options:\n\
1378 \n\
1379 -m11/03                 same as -mkd11f\n\
1380 -m11/04                 same as -mkd11d\n\
1381 -m11/05                 same as -mkd11b\n\
1382 -m11/10                 same as -mkd11b\n\
1383 -m11/15                 same as -mka11\n\
1384 -m11/20                 same as -mka11\n\
1385 -m11/21                 same as -mt11\n\
1386 -m11/23                 same as -mf11\n\
1387 -m11/24                 same as -mf11\n\
1388 -m11/34                 same as -mkd11e\n\
1389 -m11/34a                same as -mkd11e -mfpp\n\
1390 -m11/35                 same as -mkd11a\n\
1391 -m11/40                 same as -mkd11a\n\
1392 -m11/44                 same as -mkd11z\n\
1393 -m11/45                 same as -mkb11\n\
1394 -m11/50                 same as -mkb11\n\
1395 -m11/53                 same as -mj11\n\
1396 -m11/55                 same as -mkb11\n\
1397 -m11/60                 same as -mkd11k\n\
1398 -m11/70                 same as -mkb11\n\
1399 -m11/73                 same as -mj11\n\
1400 -m11/83                 same as -mj11\n\
1401 -m11/84                 same as -mj11\n\
1402 -m11/93                 same as -mj11\n\
1403 -m11/94                 same as -mj11\n\
1404 ");
1405 }
1406
1407 symbolS *
1408 md_undefined_symbol (char *name ATTRIBUTE_UNUSED)
1409 {
1410   return 0;
1411 }
1412
1413 valueT
1414 md_section_align (segT segment ATTRIBUTE_UNUSED,
1415                   valueT size)
1416 {
1417   return (size + 1) & ~1;
1418 }
1419
1420 long
1421 md_pcrel_from (fixS *fixP)
1422 {
1423   return fixP->fx_frag->fr_address + fixP->fx_where + fixP->fx_size;
1424 }
1425
1426 /* Translate internal representation of relocation info to BFD target
1427    format.  */
1428
1429 arelent *
1430 tc_gen_reloc (asection *section ATTRIBUTE_UNUSED,
1431               fixS *fixp)
1432 {
1433   arelent *reloc;
1434   bfd_reloc_code_real_type code;
1435
1436   reloc = XNEW (arelent);
1437
1438   reloc->sym_ptr_ptr = XNEW (asymbol *);
1439   *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
1440   reloc->address = fixp->fx_frag->fr_address + fixp->fx_where;
1441
1442   /* This is taken account for in md_apply_fix().  */
1443   reloc->addend = -symbol_get_bfdsym (fixp->fx_addsy)->section->vma;
1444
1445   code = fixp->fx_r_type;
1446   if (fixp->fx_pcrel)
1447     {
1448       switch (code)
1449         {
1450         case BFD_RELOC_16:
1451           code = BFD_RELOC_16_PCREL;
1452           break;
1453
1454         case BFD_RELOC_16_PCREL:
1455           break;
1456
1457         default:
1458           BAD_CASE (code);
1459           return NULL;
1460         }
1461     }
1462
1463   reloc->howto = bfd_reloc_type_lookup (stdoutput, code);
1464
1465   if (reloc->howto == NULL)
1466     {
1467       as_bad_where (fixp->fx_file, fixp->fx_line,
1468                     _("Can not represent %s relocation in this object file format"),
1469                     bfd_get_reloc_code_name (code));
1470       return NULL;
1471     }
1472
1473   return reloc;
1474 }
1475
1476 void
1477 pseudo_bss (int c ATTRIBUTE_UNUSED)
1478 {
1479   int temp;
1480
1481   temp = get_absolute_expression ();
1482   subseg_set (bss_section, temp);
1483   demand_empty_rest_of_line ();
1484 }
1485
1486 void
1487 pseudo_even (int c ATTRIBUTE_UNUSED)
1488 {
1489   int alignment = 1; /* 2^1 */
1490   frag_align (alignment, 0, 1);
1491   record_alignment (now_seg, alignment);
1492 }
1493
1494 const char *
1495 md_atof (int type, char * litP, int * sizeP)
1496 {
1497   return vax_md_atof (type, litP, sizeP);
1498 }