gas/config/tc-pdp11.c

   1 /* tc-pdp11.c - pdp11-specific -
   2    Copyright (C) 2001-2020 Free Software Foundation, Inc.
   3
   4    This file is part of GAS, the GNU Assembler.
   5
   6    GAS is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3, or (at your option)
   9    any later version.
  10
  11    GAS is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with GAS; see the file COPYING.  If not, write to
  18    the Free Software Foundation, 51 Franklin Street - Fifth Floor,
  19    Boston, MA 02110-1301, USA.  */
  20
  21 #include "as.h"
  22 #include "safe-ctype.h"
  23 #include "opcode/pdp11.h"
  24
  25 extern int flonum_gen2vax (int, FLONUM_TYPE * f, LITTLENUM_TYPE *);
  26
  27 #define TRUE  1
  28 #define FALSE 0
  29
  30 /* A representation for PDP-11 machine code.  */
  31 struct pdp11_code
  32 {
  33   const char *error;
  34   int code;
  35   int additional;       /* Is there an additional word?  */
  36   int word;             /* Additional word, if any.  */
  37   struct
  38   {
  39     bfd_reloc_code_real_type type;
  40     expressionS exp;
  41     int pc_rel;
  42   } reloc;
  43 };
  44
  45 /* Instruction set extensions.
  46
  47    If you change this from an array to something else, please update
  48    the "PDP-11 instruction set extensions" comment in pdp11.h.  */
  49 int pdp11_extension[PDP11_EXT_NUM];
  50
  51 /* Assembly options.  */
  52
  53 #define ASM_OPT_PIC 1
  54 #define ASM_OPT_NUM 2
  55
  56 int asm_option[ASM_OPT_NUM];
  57
  58 /* These chars start a comment anywhere in a source file (except inside
  59    another comment.  */
  60 const char comment_chars[] = "#/";
  61
  62 /* These chars only start a comment at the beginning of a line.  */
  63 const char line_comment_chars[] = "#/";
  64
  65 const char line_separator_chars[] = ";";
  66
  67 /* Chars that can be used to separate mant from exp in floating point nums.  */
  68 const char EXP_CHARS[] = "eE";
  69
  70 /* Chars that mean this number is a floating point constant.  */
  71 /* as in 0f123.456.  */
  72 /* or    0H1.234E-12 (see exp chars above).  */
  73 const char FLT_CHARS[] = "dDfF";
  74
  75 void pseudo_even (int);
  76 void pseudo_bss (int);
  77
  78 const pseudo_typeS md_pseudo_table[] =
  79 {
  80   { "bss", pseudo_bss, 0 },
  81   { "even", pseudo_even, 0 },
  82   { 0, 0, 0 },
  83 };
  84
  85 static struct hash_control *insn_hash = NULL;
  86 \f
  87 static int
  88 set_option (const char *arg)
  89 {
  90   int yes = 1;
  91
  92   if (strcmp (arg, "all-extensions") == 0
  93       || strcmp (arg, "all") == 0)
  94     {
  95       memset (pdp11_extension, ~0, sizeof pdp11_extension);
  96       pdp11_extension[PDP11_NONE] = 0;
  97       return 1;
  98     }
  99   else if (strcmp (arg, "no-extensions") == 0)
 100     {
 101       memset (pdp11_extension, 0, sizeof pdp11_extension);
 102       pdp11_extension[PDP11_BASIC] = 1;
 103       return 1;
 104     }
 105
 106   if (strncmp (arg, "no-", 3) == 0)
 107     {
 108       yes = 0;
 109       arg += 3;
 110     }
 111
 112   /* Commercial instructions.  */
 113   if (strcmp (arg, "cis") == 0)
 114     pdp11_extension[PDP11_CIS] = yes;
 115   /* Call supervisor mode.  */
 116   else if (strcmp (arg, "csm") == 0)
 117     pdp11_extension[PDP11_CSM] = yes;
 118   /* Extended instruction set.  */
 119   else if (strcmp (arg, "eis") == 0)
 120     pdp11_extension[PDP11_EIS] = pdp11_extension[PDP11_LEIS] = yes;
 121   /* KEV11 floating-point.  */
 122   else if (strcmp (arg, "fis") == 0
 123            || strcmp (arg, "kev11") == 0
 124            || strcmp (arg, "kev-11") == 0)
 125     pdp11_extension[PDP11_FIS] = yes;
 126   /* FP-11 floating-point.  */
 127   else if (strcmp (arg, "fpp") == 0
 128            || strcmp (arg, "fpu") == 0
 129            || strcmp (arg, "fp11") == 0
 130            || strcmp (arg, "fp-11") == 0
 131            || strcmp (arg, "fpj11") == 0
 132            || strcmp (arg, "fp-j11") == 0
 133            || strcmp (arg, "fpj-11") == 0)
 134     pdp11_extension[PDP11_FPP] = yes;
 135   /* Limited extended insns.  */
 136   else if (strcmp (arg, "limited-eis") == 0)
 137     {
 138       pdp11_extension[PDP11_LEIS] = yes;
 139       if (!pdp11_extension[PDP11_LEIS])
 140         pdp11_extension[PDP11_EIS] = 0;
 141     }
 142   /* Move from processor type.  */
 143   else if (strcmp (arg, "mfpt") == 0)
 144     pdp11_extension[PDP11_MFPT] = yes;
 145   /* Multiprocessor insns:  */
 146   else if (strncmp (arg, "mproc", 5) == 0
 147            /* TSTSET, WRTLCK */
 148            || strncmp (arg, "multiproc", 9) == 0)
 149     pdp11_extension[PDP11_MPROC] = yes;
 150   /* Move from/to proc status.  */
 151   else if (strcmp (arg, "mxps") == 0)
 152     pdp11_extension[PDP11_MXPS] = yes;
 153   /* Position-independent code.  */
 154   else if (strcmp (arg, "pic") == 0)
 155     asm_option[ASM_OPT_PIC] = yes;
 156   /* Set priority level.  */
 157   else if (strcmp (arg, "spl") == 0)
 158     pdp11_extension[PDP11_SPL] = yes;
 159   /* Microcode instructions:  */
 160   else if (strcmp (arg, "ucode") == 0
 161            /* LDUB, MED, XFC */
 162            || strcmp (arg, "microcode") == 0)
 163     pdp11_extension[PDP11_UCODE] = yes;
 164   else
 165     return 0;
 166
 167   return 1;
 168 }
 169
 170
 171 static void
 172 init_defaults (void)
 173 {
 174   static int first = 1;
 175
 176   if (first)
 177     {
 178       set_option ("all-extensions");
 179       set_option ("pic");
 180       first = 0;
 181     }
 182 }
 183
 184 void
 185 md_begin (void)
 186 {
 187   int i;
 188
 189   init_defaults ();
 190
 191   insn_hash = hash_new ();
 192   if (insn_hash == NULL)
 193     as_fatal (_("Virtual memory exhausted"));
 194
 195   for (i = 0; i < pdp11_num_opcodes; i++)
 196     hash_insert (insn_hash, pdp11_opcodes[i].name, (void *) (pdp11_opcodes + i));
 197   for (i = 0; i < pdp11_num_aliases; i++)
 198     hash_insert (insn_hash, pdp11_aliases[i].name, (void *) (pdp11_aliases + i));
 199 }
 200
 201 void
 202 md_number_to_chars (char con[], valueT value, int nbytes)
 203 {
 204   /* On a PDP-11, 0x1234 is stored as "\x12\x34", and
 205      0x12345678 is stored as "\x56\x78\x12\x34". It's
 206      anyone's guess what 0x123456 would be stored like.  */
 207
 208   switch (nbytes)
 209     {
 210     case 0:
 211       break;
 212     case 1:
 213       con[0] =  value       & 0xff;
 214       break;
 215     case 2:
 216       con[0] =  value        & 0xff;
 217       con[1] = (value >>  8) & 0xff;
 218       break;
 219     case 4:
 220       con[0] = (value >> 16) & 0xff;
 221       con[1] = (value >> 24) & 0xff;
 222       con[2] =  value        & 0xff;
 223       con[3] = (value >>  8) & 0xff;
 224       break;
 225     default:
 226       BAD_CASE (nbytes);
 227     }
 228 }
 229
 230 /* Fix up some data or instructions after we find out the value of a symbol
 231    that they reference.  Knows about order of bytes in address.  */
 232
 233 void
 234 md_apply_fix (fixS *fixP,
 235                valueT * valP,
 236                segT seg ATTRIBUTE_UNUSED)
 237 {
 238   valueT code;
 239   valueT mask;
 240   valueT val = * valP;
 241   char *buf;
 242   int shift;
 243   int size;
 244
 245   buf = fixP->fx_where + fixP->fx_frag->fr_literal;
 246   size = fixP->fx_size;
 247   code = md_chars_to_number ((unsigned char *) buf, size);
 248
 249   switch (fixP->fx_r_type)
 250     {
 251     case BFD_RELOC_8:
 252       mask = 0xff;
 253       shift = 0;
 254       break;
 255     case BFD_RELOC_16:
 256     case BFD_RELOC_16_PCREL:
 257       mask = 0xffff;
 258       shift = 0;
 259       break;
 260     case BFD_RELOC_32:
 261       mask = 0xffffffff;
 262       shift = 0;
 263       break;
 264     case BFD_RELOC_PDP11_DISP_8_PCREL:
 265       mask = 0x00ff;
 266       shift = 1;
 267       break;
 268     case BFD_RELOC_PDP11_DISP_6_PCREL:
 269       mask = 0x003f;
 270       shift = 1;
 271       val = -val;
 272       break;
 273     default:
 274       BAD_CASE (fixP->fx_r_type);
 275     }
 276
 277   if (fixP->fx_addsy != NULL)
 278     val += symbol_get_bfdsym (fixP->fx_addsy)->section->vma;
 279     /* *value += fixP->fx_addsy->bsym->section->vma; */
 280
 281   code &= ~mask;
 282   code |= (val >> shift) & mask;
 283   number_to_chars_littleendian (buf, code, size);
 284
 285   if (fixP->fx_addsy == NULL && fixP->fx_pcrel == 0)
 286     fixP->fx_done = 1;
 287 }
 288
 289 long
 290 md_chars_to_number (unsigned char *con, int nbytes)
 291 {
 292   /* On a PDP-11, 0x1234 is stored as "\x12\x34", and
 293      0x12345678 is stored as "\x56\x78\x12\x34". It's
 294      anyone's guess what 0x123456 would be stored like.  */
 295   switch (nbytes)
 296     {
 297     case 0:
 298       return 0;
 299     case 1:
 300       return con[0];
 301     case 2:
 302       return (con[1] << BITS_PER_CHAR) | con[0];
 303     case 4:
 304       return
 305         (((con[1] << BITS_PER_CHAR) | con[0]) << (2 * BITS_PER_CHAR))
 306         |((con[3] << BITS_PER_CHAR) | con[2]);
 307     default:
 308       BAD_CASE (nbytes);
 309       return 0;
 310     }
 311 }
 312 \f
 313 static char *
 314 skip_whitespace (char *str)
 315 {
 316   while (*str == ' ' || *str == '\t')
 317     str++;
 318   return str;
 319 }
 320
 321 static char *
 322 find_whitespace (char *str)
 323 {
 324   while (*str != ' ' && *str != '\t' && *str != 0)
 325     str++;
 326   return str;
 327 }
 328
 329 static char *
 330 parse_reg (char *str, struct pdp11_code *operand)
 331 {
 332   str = skip_whitespace (str);
 333   if (TOLOWER (*str) == 'r')
 334     {
 335       str++;
 336       switch (*str)
 337         {
 338         case '0': case '1': case '2': case '3':
 339         case '4': case '5': case '6': case '7':
 340           operand->code = *str - '0';
 341           str++;
 342           break;
 343         default:
 344           operand->error = _("Bad register name");
 345           return str - 1;
 346         }
 347     }
 348   else if (strncmp (str, "sp", 2) == 0
 349            || strncmp (str, "SP", 2) == 0)
 350     {
 351       operand->code = 6;
 352       str += 2;
 353     }
 354   else if (strncmp (str, "pc", 2) == 0
 355            || strncmp (str, "PC", 2) == 0)
 356     {
 357       operand->code = 7;
 358       str += 2;
 359     }
 360   else
 361     {
 362       operand->error = _("Bad register name");
 363       return str;
 364     }
 365
 366   if (ISALNUM (*str) || *str == '_' || *str == '.')
 367     {
 368       operand->error = _("Bad register name");
 369       str -= 2;
 370     }
 371
 372   return str;
 373 }
 374
 375 static char *
 376 parse_ac5 (char *str, struct pdp11_code *operand)
 377 {
 378   str = skip_whitespace (str);
 379   if (strncmp (str, "fr", 2) == 0
 380       || strncmp (str, "FR", 2) == 0
 381       || strncmp (str, "ac", 2) == 0
 382       || strncmp (str, "AC", 2) == 0)
 383     {
 384       str += 2;
 385       switch (*str)
 386         {
 387         case '0': case '1': case '2': case '3':
 388         case '4': case '5':
 389           operand->code = *str - '0';
 390           str++;
 391           break;
 392         default:
 393           operand->error = _("Bad register name");
 394           return str - 2;
 395         }
 396     }
 397   else
 398     {
 399       operand->error = _("Bad register name");
 400       return str;
 401     }
 402
 403   return str;
 404 }
 405
 406 static char *
 407 parse_ac (char *str, struct pdp11_code *operand)
 408 {
 409   str = parse_ac5 (str, operand);
 410   if (!operand->error && operand->code > 3)
 411     {
 412       operand->error = _("Bad register name");
 413           return str - 3;
 414     }
 415
 416   return str;
 417 }
 418
 419 static char *
 420 parse_expression (char *str, struct pdp11_code *operand)
 421 {
 422   char *save_input_line_pointer;
 423   segT seg;
 424
 425   save_input_line_pointer = input_line_pointer;
 426   input_line_pointer = str;
 427   seg = expression (&operand->reloc.exp);
 428   if (seg == NULL)
 429     {
 430       input_line_pointer = save_input_line_pointer;
 431       operand->error = _("Error in expression");
 432       return str;
 433     }
 434
 435   str = input_line_pointer;
 436   input_line_pointer = save_input_line_pointer;
 437
 438   operand->reloc.pc_rel = 0;
 439
 440   return str;
 441 }
 442
 443 static char *
 444 parse_op_no_deferred (char *str, struct pdp11_code *operand)
 445 {
 446   LITTLENUM_TYPE literal_float[2];
 447
 448   str = skip_whitespace (str);
 449
 450   switch (*str)
 451     {
 452     case '(':                           /* (rn) and (rn)+ */
 453       str = parse_reg (str + 1, operand);
 454       if (operand->error)
 455         return str;
 456       str = skip_whitespace (str);
 457       if (*str != ')')
 458         {
 459           operand->error = _("Missing ')'");
 460           return str;
 461         }
 462       str++;
 463       if (*str == '+')
 464         {
 465           operand->code |= 020;
 466           str++;
 467         }
 468       else
 469         {
 470           operand->code |= 010;
 471         }
 472       break;
 473
 474       /* Immediate.  */
 475     case '#':
 476     case '$':
 477       str = parse_expression (str + 1, operand);
 478       if (operand->error)
 479         return str;
 480       operand->additional = TRUE;
 481       operand->word = operand->reloc.exp.X_add_number;
 482       switch (operand->reloc.exp.X_op)
 483         {
 484         case O_constant:
 485           break;
 486         case O_symbol:
 487         case O_add:
 488         case O_subtract:
 489           operand->reloc.type = BFD_RELOC_16;
 490           operand->reloc.pc_rel = 0;
 491           break;
 492         case O_big:
 493           if (operand->reloc.exp.X_add_number > 0)
 494             {
 495               operand->error = _("Error in expression");
 496               break;
 497             }
 498           /* It's a floating literal...  */
 499           know (operand->reloc.exp.X_add_number < 0);
 500           flonum_gen2vax ('f', &generic_floating_point_number, literal_float);
 501           operand->word = literal_float[0];
 502           if (literal_float[1] != 0)
 503             as_warn (_("Low order bits truncated in immediate float operand"));
 504           break;
 505         default:
 506           operand->error = _("Error in expression");
 507           break;
 508         }
 509       operand->code = 027;
 510       break;
 511
 512       /* label, d(rn), -(rn)  */
 513     default:
 514       {
 515         if (strncmp (str, "-(", 2) == 0)        /* -(rn) */
 516           {
 517             str = parse_reg (str + 2, operand);
 518             if (operand->error)
 519               return str;
 520             str = skip_whitespace (str);
 521             if (*str != ')')
 522               {
 523                 operand->error = _("Missing ')'");
 524                 return str;
 525               }
 526             operand->code |= 040;
 527             str++;
 528             break;
 529           }
 530
 531         str = parse_expression (str, operand);
 532         if (operand->error)
 533           return str;
 534
 535         str = skip_whitespace (str);
 536
 537         if (*str != '(')
 538           {
 539             operand->code = 067;
 540             operand->additional = 1;
 541             operand->word = 0;
 542             operand->reloc.type = BFD_RELOC_16_PCREL;
 543             operand->reloc.pc_rel = 1;
 544             break;
 545           }
 546
 547         /* d(rn) */
 548         str++;
 549         str = parse_reg (str, operand);
 550         if (operand->error)
 551           return str;
 552
 553         str = skip_whitespace (str);
 554
 555         if (*str != ')')
 556           {
 557             operand->error = _("Missing ')'");
 558             return str;
 559           }
 560
 561         str++;
 562         operand->additional = TRUE;
 563         operand->code |= 060;
 564         switch (operand->reloc.exp.X_op)
 565           {
 566           case O_symbol:
 567             operand->reloc.type = BFD_RELOC_16;
 568             operand->reloc.pc_rel = 0;
 569             break;
 570           case O_constant:
 571             if ((operand->code & 7) == 7)
 572               {
 573                 operand->reloc.pc_rel = 1;
 574                 operand->word = operand->reloc.exp.X_add_number;
 575               }
 576             else
 577               operand->word = operand->reloc.exp.X_add_number;
 578
 579             break;
 580           default:
 581             BAD_CASE (operand->reloc.exp.X_op);
 582           }
 583         break;
 584       }
 585     }
 586
 587   return str;
 588 }
 589
 590 static char *
 591 parse_op_noreg (char *str, struct pdp11_code *operand)
 592 {
 593   str = skip_whitespace (str);
 594   operand->error = NULL;
 595
 596   if (*str == '@' || *str == '*')
 597     {
 598       /* @(Rn) == @0(Rn): Mode 7, Indexed deferred.
 599          Check for auto-increment deferred.  */
 600       if (str[1] == '('
 601           && str[2] != 0
 602           && str[3] != 0
 603           && str[4] != 0
 604           && str[5] != '+')
 605         {
 606           /* Change implied to explicit index deferred.  */
 607           *str = '0';
 608           str = parse_op_no_deferred (str, operand);
 609         }
 610       else
 611         {
 612           /* @Rn == (Rn): Register deferred.  */
 613           str = parse_reg (str + 1, operand);
 614
 615           /* Not @Rn */
 616           if (operand->error)
 617             {
 618               operand->error = NULL;
 619               str = parse_op_no_deferred (str, operand);
 620             }
 621         }
 622
 623       if (operand->error)
 624         return str;
 625
 626       operand->code |= 010;
 627     }
 628   else
 629     str = parse_op_no_deferred (str, operand);
 630
 631   return str;
 632 }
 633
 634 static char *
 635 parse_op (char *str, struct pdp11_code *operand)
 636 {
 637   str = skip_whitespace (str);
 638
 639   str = parse_reg (str, operand);
 640   if (!operand->error)
 641     return str;
 642
 643   operand->error = NULL;
 644   parse_ac5 (str, operand);
 645   if (!operand->error)
 646     {
 647       operand->error = _("Float AC not legal as integer operand");
 648       return str;
 649     }
 650
 651   return parse_op_noreg (str, operand);
 652 }
 653
 654 static char *
 655 parse_fop (char *str, struct pdp11_code *operand)
 656 {
 657   str = skip_whitespace (str);
 658
 659   str = parse_ac5 (str, operand);
 660   if (!operand->error)
 661     return str;
 662
 663   operand->error = NULL;
 664   parse_reg (str, operand);
 665   if (!operand->error)
 666     {
 667       operand->error = _("General register not legal as float operand");
 668       return str;
 669     }
 670
 671   return parse_op_noreg (str, operand);
 672 }
 673
 674 static char *
 675 parse_separator (char *str, int *error)
 676 {
 677   str = skip_whitespace (str);
 678   *error = (*str != ',');
 679   if (!*error)
 680     str++;
 681   return str;
 682 }
 683
 684 void
 685 md_assemble (char *instruction_string)
 686 {
 687   const struct pdp11_opcode *op;
 688   struct pdp11_code insn, op1, op2;
 689   int error;
 690   int size;
 691   const char *err = NULL;
 692   char *str;
 693   char *p;
 694   char c;
 695
 696   str = skip_whitespace (instruction_string);
 697   p = find_whitespace (str);
 698   if (p - str == 0)
 699     {
 700       as_bad (_("No instruction found"));
 701       return;
 702     }
 703
 704   c = *p;
 705   *p = '\0';
 706   op = (struct pdp11_opcode *)hash_find (insn_hash, str);
 707   *p = c;
 708   if (op == 0)
 709     {
 710       as_bad (_("Unknown instruction '%s'"), str);
 711       return;
 712     }
 713
 714   if (!pdp11_extension[op->extension])
 715     {
 716       as_warn (_("Unsupported instruction set extension: %s"), op->name);
 717       return;
 718     }
 719
 720   insn.error = NULL;
 721   insn.code = op->opcode;
 722   insn.reloc.type = BFD_RELOC_NONE;
 723   op1.error = NULL;
 724   op1.additional = FALSE;
 725   op1.reloc.type = BFD_RELOC_NONE;
 726   op2.error = NULL;
 727   op2.additional = FALSE;
 728   op2.reloc.type = BFD_RELOC_NONE;
 729
 730   str = p;
 731   size = 2;
 732
 733   switch (op->type)
 734     {
 735     case PDP11_OPCODE_NO_OPS:
 736       str = skip_whitespace (str);
 737       break;
 738
 739     case PDP11_OPCODE_IMM3:
 740     case PDP11_OPCODE_IMM6:
 741     case PDP11_OPCODE_IMM8:
 742       str = skip_whitespace (str);
 743       if (*str == '#' || *str == '$')
 744         str++;
 745       str = parse_expression (str, &op1);
 746       if (op1.error)
 747         break;
 748       if (op1.reloc.exp.X_op != O_constant || op1.reloc.type != BFD_RELOC_NONE)
 749         {
 750           op1.error = _("operand is not an absolute constant");
 751           break;
 752         }
 753       switch (op->type)
 754         {
 755         case PDP11_OPCODE_IMM3:
 756           if (op1.reloc.exp.X_add_number & ~7)
 757             {
 758               op1.error = _("3-bit immediate out of range");
 759               break;
 760             }
 761           break;
 762         case PDP11_OPCODE_IMM6:
 763           if (op1.reloc.exp.X_add_number & ~0x3f)
 764             {
 765               op1.error = _("6-bit immediate out of range");
 766               break;
 767             }
 768           break;
 769         case PDP11_OPCODE_IMM8:
 770           if (op1.reloc.exp.X_add_number & ~0xff)
 771             {
 772               op1.error = _("8-bit immediate out of range");
 773               break;
 774             }
 775           break;
 776         }
 777       insn.code |= op1.reloc.exp.X_add_number;
 778       break;
 779
 780     case PDP11_OPCODE_DISPL:
 781       {
 782         char *new_pointer;
 783         new_pointer = parse_expression (str, &op1);
 784         op1.code = 0;
 785         op1.reloc.pc_rel = 1;
 786         op1.reloc.type = BFD_RELOC_PDP11_DISP_8_PCREL;
 787         if (op1.reloc.exp.X_op != O_symbol)
 788           {
 789             op1.error = _("Symbol expected");
 790             break;
 791           }
 792         if (op1.code & ~0xff)
 793           {
 794             err = _("8-bit displacement out of range");
 795             break;
 796           }
 797         str = new_pointer;
 798         insn.code |= op1.code;
 799         insn.reloc = op1.reloc;
 800       }
 801       break;
 802
 803     case PDP11_OPCODE_REG:
 804       str = parse_reg (str, &op1);
 805       if (op1.error)
 806         break;
 807       insn.code |= op1.code;
 808       break;
 809
 810     case PDP11_OPCODE_OP:
 811       str = parse_op (str, &op1);
 812       if (op1.error)
 813         break;
 814       insn.code |= op1.code;
 815       if (op1.additional)
 816         size += 2;
 817       break;
 818
 819     case PDP11_OPCODE_FOP:
 820       str = parse_fop (str, &op1);
 821       if (op1.error)
 822         break;
 823       insn.code |= op1.code;
 824       if (op1.additional)
 825         size += 2;
 826       break;
 827
 828     case PDP11_OPCODE_REG_OP:
 829       str = parse_reg (str, &op2);
 830       if (op2.error)
 831         break;
 832       insn.code |= op2.code << 6;
 833       str = parse_separator (str, &error);
 834       if (error)
 835         {
 836           op2.error = _("Missing ','");
 837           break;
 838         }
 839       str = parse_op (str, &op1);
 840       if (op1.error)
 841         break;
 842       insn.code |= op1.code;
 843       if (op1.additional)
 844         size += 2;
 845       break;
 846
 847     case PDP11_OPCODE_REG_OP_REV:
 848       str = parse_op (str, &op1);
 849       if (op1.error)
 850         break;
 851       insn.code |= op1.code;
 852       if (op1.additional)
 853         size += 2;
 854       str = parse_separator (str, &error);
 855       if (error)
 856         {
 857           op2.error = _("Missing ','");
 858           break;
 859         }
 860       str = parse_reg (str, &op2);
 861       if (op2.error)
 862         break;
 863       insn.code |= op2.code << 6;
 864       break;
 865
 866     case PDP11_OPCODE_AC_FOP:
 867       str = parse_ac (str, &op2);
 868       if (op2.error)
 869         break;
 870       insn.code |= op2.code << 6;
 871       str = parse_separator (str, &error);
 872       if (error)
 873         {
 874           op1.error = _("Missing ','");
 875           break;
 876         }
 877       str = parse_fop (str, &op1);
 878       if (op1.error)
 879         break;
 880       insn.code |= op1.code;
 881       if (op1.additional)
 882         size += 2;
 883       break;
 884
 885     case PDP11_OPCODE_FOP_AC:
 886       str = parse_fop (str, &op1);
 887       if (op1.error)
 888         break;
 889       insn.code |= op1.code;
 890       if (op1.additional)
 891         size += 2;
 892       str = parse_separator (str, &error);
 893       if (error)
 894         {
 895           op1.error = _("Missing ','");
 896           break;
 897         }
 898       str = parse_ac (str, &op2);
 899       if (op2.error)
 900         break;
 901       insn.code |= op2.code << 6;
 902       break;
 903
 904     case PDP11_OPCODE_AC_OP:
 905       str = parse_ac (str, &op2);
 906       if (op2.error)
 907         break;
 908       insn.code |= op2.code << 6;
 909       str = parse_separator (str, &error);
 910       if (error)
 911         {
 912           op1.error = _("Missing ','");
 913           break;
 914         }
 915       str = parse_op (str, &op1);
 916       if (op1.error)
 917         break;
 918       insn.code |= op1.code;
 919       if (op1.additional)
 920         size += 2;
 921       break;
 922
 923     case PDP11_OPCODE_OP_AC:
 924       str = parse_op (str, &op1);
 925       if (op1.error)
 926         break;
 927       insn.code |= op1.code;
 928       if (op1.additional)
 929         size += 2;
 930       str = parse_separator (str, &error);
 931       if (error)
 932         {
 933           op1.error = _("Missing ','");
 934           break;
 935         }
 936       str = parse_ac (str, &op2);
 937       if (op2.error)
 938         break;
 939       insn.code |= op2.code << 6;
 940       break;
 941
 942     case PDP11_OPCODE_OP_OP:
 943       str = parse_op (str, &op1);
 944       if (op1.error)
 945         break;
 946       insn.code |= op1.code << 6;
 947       if (op1.additional)
 948         size += 2;
 949       str = parse_separator (str, &error);
 950       if (error)
 951         {
 952           op2.error = _("Missing ','");
 953           break;
 954         }
 955       str = parse_op (str, &op2);
 956       if (op2.error)
 957         break;
 958       insn.code |= op2.code;
 959       if (op2.additional)
 960         size += 2;
 961       break;
 962
 963     case PDP11_OPCODE_REG_DISPL:
 964       {
 965         char *new_pointer;
 966         str = parse_reg (str, &op2);
 967         if (op2.error)
 968           break;
 969         insn.code |= op2.code << 6;
 970         str = parse_separator (str, &error);
 971         if (error)
 972           {
 973             op1.error = _("Missing ','");
 974             break;
 975           }
 976         new_pointer = parse_expression (str, &op1);
 977         op1.code = 0;
 978         op1.reloc.pc_rel = 1;
 979         op1.reloc.type = BFD_RELOC_PDP11_DISP_6_PCREL;
 980         if (op1.reloc.exp.X_op != O_symbol)
 981           {
 982             op1.error = _("Symbol expected");
 983             break;
 984           }
 985         if (op1.code & ~0x3f)
 986           {
 987             err = _("6-bit displacement out of range");
 988             break;
 989           }
 990         str = new_pointer;
 991         insn.code |= op1.code;
 992         insn.reloc = op1.reloc;
 993       }
 994       break;
 995
 996     default:
 997       BAD_CASE (op->type);
 998     }
 999
1000   if (op1.error)
1001     err = op1.error;
1002   else if (op2.error)
1003     err = op2.error;
1004   else
1005     {
1006       str = skip_whitespace (str);
1007       if (*str)
1008         err = _("Too many operands");
1009     }
1010
1011   {
1012     char *to = NULL;
1013
1014     if (err)
1015       {
1016         as_bad ("%s", err);
1017         return;
1018       }
1019
1020     to = frag_more (size);
1021
1022     md_number_to_chars (to, insn.code, 2);
1023     if (insn.reloc.type != BFD_RELOC_NONE)
1024       fix_new_exp (frag_now, to - frag_now->fr_literal, 2,
1025                    &insn.reloc.exp, insn.reloc.pc_rel, insn.reloc.type);
1026     to += 2;
1027
1028     if (op1.additional)
1029       {
1030         md_number_to_chars (to, op1.word, 2);
1031         if (op1.reloc.type != BFD_RELOC_NONE)
1032           fix_new_exp (frag_now, to - frag_now->fr_literal, 2,
1033                        &op1.reloc.exp, op1.reloc.pc_rel, op1.reloc.type);
1034         to += 2;
1035       }
1036
1037     if (op2.additional)
1038       {
1039         md_number_to_chars (to, op2.word, 2);
1040         if (op2.reloc.type != BFD_RELOC_NONE)
1041           fix_new_exp (frag_now, to - frag_now->fr_literal, 2,
1042                        &op2.reloc.exp, op2.reloc.pc_rel, op2.reloc.type);
1043       }
1044   }
1045 }
1046
1047 int
1048 md_estimate_size_before_relax (fragS *fragP ATTRIBUTE_UNUSED,
1049                                segT segment ATTRIBUTE_UNUSED)
1050 {
1051   return 0;
1052 }
1053
1054 void
1055 md_convert_frag (bfd *headers ATTRIBUTE_UNUSED,
1056                  segT seg ATTRIBUTE_UNUSED,
1057                  fragS *fragP ATTRIBUTE_UNUSED)
1058 {
1059 }
1060
1061 int md_short_jump_size = 2;
1062 int md_long_jump_size = 4;
1063
1064 void
1065 md_create_short_jump (char *ptr ATTRIBUTE_UNUSED,
1066                       addressT from_addr ATTRIBUTE_UNUSED,
1067                       addressT to_addr ATTRIBUTE_UNUSED,
1068                       fragS *frag ATTRIBUTE_UNUSED,
1069                       symbolS *to_symbol ATTRIBUTE_UNUSED)
1070 {
1071 }
1072
1073 void
1074 md_create_long_jump (char *ptr ATTRIBUTE_UNUSED,
1075                      addressT from_addr ATTRIBUTE_UNUSED,
1076                      addressT to_addr ATTRIBUTE_UNUSED,
1077                      fragS *frag ATTRIBUTE_UNUSED,
1078                      symbolS *to_symbol ATTRIBUTE_UNUSED)
1079 {
1080 }
1081
1082 static int
1083 set_cpu_model (const char *arg)
1084 {
1085   char buf[4];
1086   char *model = buf;
1087
1088   if (arg[0] == 'k')
1089     arg++;
1090
1091   *model++ = *arg++;
1092
1093   if (strchr ("abdx", model[-1]) == NULL)
1094     return 0;
1095
1096   if (model[-1] == 'd')
1097     {
1098       if (arg[0] == 'f' || arg[0] == 'j')
1099         model[-1] = *arg++;
1100     }
1101   else if (model[-1] == 'x')
1102     {
1103       if (arg[0] == 't')
1104         model[-1] = *arg++;
1105     }
1106
1107   if (arg[0] == '-')
1108     arg++;
1109
1110   if (strncmp (arg, "11", 2) != 0)
1111     return 0;
1112   arg += 2;
1113
1114   if (arg[0] == '-')
1115     {
1116       if (*++arg == 0)
1117         return 0;
1118     }
1119
1120   /* Allow up to two revision letters.  */
1121   if (arg[0] != 0)
1122     *model++ = *arg++;
1123   if (arg[0] != 0)
1124     *model++ = *arg++;
1125
1126   *model++ = 0;
1127
1128   set_option ("no-extensions");
1129
1130   /* KA11 (11/15/20).  */
1131   if (strncmp (buf, "a", 1) == 0)
1132     return 1; /* No extensions.  */
1133
1134   /* KB11 (11/45/50/55/70).  */
1135   else if (strncmp (buf, "b", 1) == 0)
1136     return set_option ("eis") && set_option ("spl");
1137
1138   /* KD11-A (11/35/40).  */
1139   else if (strncmp (buf, "da", 2) == 0)
1140     return set_option ("limited-eis");
1141
1142   /* KD11-B (11/05/10).  */
1143   else if (strncmp (buf, "db", 2) == 0
1144            /* KD11-D (11/04).  */
1145            || strncmp (buf, "dd", 2) == 0)
1146     return 1; /* no extensions */
1147
1148   /* KD11-E (11/34).  */
1149   else if (strncmp (buf, "de", 2) == 0)
1150     return set_option ("eis") && set_option ("mxps");
1151
1152   /* KD11-F (11/03).  */
1153   else if (strncmp (buf, "df", 2) == 0
1154            /* KD11-H (11/03).  */
1155            || strncmp (buf, "dh", 2) == 0
1156            /* KD11-Q (11/03).  */
1157            || strncmp (buf, "dq", 2) == 0)
1158     return set_option ("limited-eis") && set_option ("mxps");
1159
1160   /* KD11-K (11/60).  */
1161   else if (strncmp (buf, "dk", 2) == 0)
1162     return set_option ("eis")
1163       && set_option ("mxps")
1164       && set_option ("ucode");
1165
1166   /* KD11-Z (11/44).  */
1167   else if (strncmp (buf, "dz", 2) == 0)
1168     return set_option ("csm")
1169       && set_option ("eis")
1170       && set_option ("mfpt")
1171       && set_option ("mxps")
1172       && set_option ("spl");
1173
1174   /* F11 (11/23/24).  */
1175   else if (strncmp (buf, "f", 1) == 0)
1176     return set_option ("eis")
1177       && set_option ("mfpt")
1178       && set_option ("mxps");
1179
1180   /* J11 (11/53/73/83/84/93/94).  */
1181   else if (strncmp (buf, "j", 1) == 0)
1182     return set_option ("csm")
1183       && set_option ("eis")
1184       && set_option ("mfpt")
1185       && set_option ("multiproc")
1186       && set_option ("mxps")
1187       && set_option ("spl");
1188
1189   /* T11 (11/21).  */
1190   else if (strncmp (buf, "t", 1) == 0)
1191     return set_option ("limited-eis")
1192       && set_option ("mxps");
1193
1194   else
1195     return 0;
1196 }
1197
1198 static int
1199 set_machine_model (const char *arg)
1200 {
1201   if (strncmp (arg, "pdp-11/", 7) != 0
1202       && strncmp (arg, "pdp11/", 6) != 0
1203       && strncmp (arg, "11/", 3) != 0)
1204     return 0;
1205
1206   if (strncmp (arg, "pdp", 3) == 0)
1207     arg += 3;
1208   if (arg[0] == '-')
1209     arg++;
1210   if (strncmp (arg, "11/", 3) == 0)
1211     arg += 3;
1212
1213   if (strcmp (arg, "03") == 0)
1214     return set_cpu_model ("kd11f");
1215
1216   else if (strcmp (arg, "04") == 0)
1217     return set_cpu_model ("kd11d");
1218
1219   else if (strcmp (arg, "05") == 0
1220            || strcmp (arg, "10") == 0)
1221     return set_cpu_model ("kd11b");
1222
1223   else if (strcmp (arg, "15") == 0
1224            || strcmp (arg, "20") == 0)
1225     return set_cpu_model ("ka11");
1226
1227   else if (strcmp (arg, "21") == 0)
1228     return set_cpu_model ("t11");
1229
1230   else if (strcmp (arg, "23") == 0
1231            || strcmp (arg, "24") == 0)
1232     return set_cpu_model ("f11");
1233
1234   else if (strcmp (arg, "34") == 0
1235            || strcmp (arg, "34a") == 0)
1236     return set_cpu_model ("kd11e");
1237
1238   else if (strcmp (arg, "35") == 0
1239            || strcmp (arg, "40") == 0)
1240     return set_cpu_model ("kd11da");
1241
1242   else if (strcmp (arg, "44") == 0)
1243     return set_cpu_model ("kd11dz");
1244
1245   else if (strcmp (arg, "45") == 0
1246            || strcmp (arg, "50") == 0
1247            || strcmp (arg, "55") == 0
1248            || strcmp (arg, "70") == 0)
1249     return set_cpu_model ("kb11");
1250
1251   else if (strcmp (arg, "60") == 0)
1252     return set_cpu_model ("kd11k");
1253
1254   else if (strcmp (arg, "53") == 0
1255            || strcmp (arg, "73") == 0
1256            || strcmp (arg, "83") == 0
1257            || strcmp (arg, "84") == 0
1258            || strcmp (arg, "93") == 0
1259            || strcmp (arg, "94") == 0)
1260     return set_cpu_model ("j11")
1261       && set_option ("fpp");
1262
1263   else
1264     return 0;
1265 }
1266
1267 const char *md_shortopts = "m:";
1268
1269 struct option md_longopts[] =
1270 {
1271 #define OPTION_CPU 257
1272   { "cpu", required_argument, NULL, OPTION_CPU },
1273 #define OPTION_MACHINE 258
1274   { "machine", required_argument, NULL, OPTION_MACHINE },
1275 #define OPTION_PIC 259
1276   { "pic", no_argument, NULL, OPTION_PIC },
1277   { NULL, no_argument, NULL, 0 }
1278 };
1279
1280 size_t md_longopts_size = sizeof (md_longopts);
1281
1282 /* Invocation line includes a switch not recognized by the base assembler.
1283    See if it's a processor-specific option.  */
1284
1285 int
1286 md_parse_option (int c, const char *arg)
1287 {
1288   init_defaults ();
1289
1290   switch (c)
1291     {
1292     case 'm':
1293       if (set_option (arg))
1294         return 1;
1295       if (set_cpu_model (arg))
1296         return 1;
1297       if (set_machine_model (arg))
1298         return 1;
1299       break;
1300
1301     case OPTION_CPU:
1302       if (set_cpu_model (arg))
1303         return 1;
1304       break;
1305
1306     case OPTION_MACHINE:
1307       if (set_machine_model (arg))
1308         return 1;
1309       break;
1310
1311     case OPTION_PIC:
1312       if (set_option ("pic"))
1313         return 1;
1314       break;
1315
1316     default:
1317       break;
1318     }
1319
1320   return 0;
1321 }
1322
1323 void
1324 md_show_usage (FILE *stream)
1325 {
1326   fprintf (stream, "\
1327 \n\
1328 PDP-11 instruction set extensions:\n\
1329 \n\
1330 -m(no-)cis              allow (disallow) commercial instruction set\n\
1331 -m(no-)csm              allow (disallow) CSM instruction\n\
1332 -m(no-)eis              allow (disallow) full extended instruction set\n\
1333 -m(no-)fis              allow (disallow) KEV11 floating-point instructions\n\
1334 -m(no-)fpp              allow (disallow) FP-11 floating-point instructions\n\
1335 -m(no-)fpu              allow (disallow) FP-11 floating-point instructions\n\
1336 -m(no-)limited-eis      allow (disallow) limited extended instruction set\n\
1337 -m(no-)mfpt             allow (disallow) processor type instruction\n\
1338 -m(no-)multiproc        allow (disallow) multiprocessor instructions\n\
1339 -m(no-)mxps             allow (disallow) processor status instructions\n\
1340 -m(no-)spl              allow (disallow) SPL instruction\n\
1341 -m(no-)ucode            allow (disallow) microcode instructions\n\
1342 -mall-extensions        allow all instruction set extensions\n\
1343                         (this is the default)\n\
1344 -mno-extensions         disallow all instruction set extensions\n\
1345 -pic                    generate position-independent code\n\
1346 \n\
1347 PDP-11 CPU model options:\n\
1348 \n\
1349 -mka11*                 KA11 CPU.  base line instruction set only\n\
1350 -mkb11*                 KB11 CPU.  enable full EIS and SPL\n\
1351 -mkd11a*                KD11-A CPU.  enable limited EIS\n\
1352 -mkd11b*                KD11-B CPU.  base line instruction set only\n\
1353 -mkd11d*                KD11-D CPU.  base line instruction set only\n\
1354 -mkd11e*                KD11-E CPU.  enable full EIS, MTPS, and MFPS\n\
1355 -mkd11f*                KD11-F CPU.  enable limited EIS, MTPS, and MFPS\n\
1356 -mkd11h*                KD11-H CPU.  enable limited EIS, MTPS, and MFPS\n\
1357 -mkd11q*                KD11-Q CPU.  enable limited EIS, MTPS, and MFPS\n\
1358 -mkd11k*                KD11-K CPU.  enable full EIS, MTPS, MFPS, LDUB, MED,\n\
1359                         XFC, and MFPT\n\
1360 -mkd11z*                KD11-Z CPU.  enable full EIS, MTPS, MFPS, MFPT, SPL,\n\
1361                         and CSM\n\
1362 -mf11*                  F11 CPU.  enable full EIS, MFPS, MTPS, and MFPT\n\
1363 -mj11*                  J11 CPU.  enable full EIS, MTPS, MFPS, MFPT, SPL,\n\
1364                         CSM, TSTSET, and WRTLCK\n\
1365 -mt11*                  T11 CPU.  enable limited EIS, MTPS, and MFPS\n\
1366 \n\
1367 PDP-11 machine model options:\n\
1368 \n\
1369 -m11/03                 same as -mkd11f\n\
1370 -m11/04                 same as -mkd11d\n\
1371 -m11/05                 same as -mkd11b\n\
1372 -m11/10                 same as -mkd11b\n\
1373 -m11/15                 same as -mka11\n\
1374 -m11/20                 same as -mka11\n\
1375 -m11/21                 same as -mt11\n\
1376 -m11/23                 same as -mf11\n\
1377 -m11/24                 same as -mf11\n\
1378 -m11/34                 same as -mkd11e\n\
1379 -m11/34a                same as -mkd11e -mfpp\n\
1380 -m11/35                 same as -mkd11a\n\
1381 -m11/40                 same as -mkd11a\n\
1382 -m11/44                 same as -mkd11z\n\
1383 -m11/45                 same as -mkb11\n\
1384 -m11/50                 same as -mkb11\n\
1385 -m11/53                 same as -mj11\n\
1386 -m11/55                 same as -mkb11\n\
1387 -m11/60                 same as -mkd11k\n\
1388 -m11/70                 same as -mkb11\n\
1389 -m11/73                 same as -mj11\n\
1390 -m11/83                 same as -mj11\n\
1391 -m11/84                 same as -mj11\n\
1392 -m11/93                 same as -mj11\n\
1393 -m11/94                 same as -mj11\n\
1394 ");
1395 }
1396
1397 symbolS *
1398 md_undefined_symbol (char *name ATTRIBUTE_UNUSED)
1399 {
1400   return 0;
1401 }
1402
1403 valueT
1404 md_section_align (segT segment ATTRIBUTE_UNUSED,
1405                   valueT size)
1406 {
1407   return (size + 1) & ~1;
1408 }
1409
1410 long
1411 md_pcrel_from (fixS *fixP)
1412 {
1413   return fixP->fx_frag->fr_address + fixP->fx_where + fixP->fx_size;
1414 }
1415
1416 /* Translate internal representation of relocation info to BFD target
1417    format.  */
1418
1419 arelent *
1420 tc_gen_reloc (asection *section ATTRIBUTE_UNUSED,
1421               fixS *fixp)
1422 {
1423   arelent *reloc;
1424   bfd_reloc_code_real_type code;
1425
1426   reloc = XNEW (arelent);
1427
1428   reloc->sym_ptr_ptr = XNEW (asymbol *);
1429   *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
1430   reloc->address = fixp->fx_frag->fr_address + fixp->fx_where;
1431
1432   /* This is taken account for in md_apply_fix().  */
1433   reloc->addend = -symbol_get_bfdsym (fixp->fx_addsy)->section->vma;
1434
1435   code = fixp->fx_r_type;
1436   if (fixp->fx_pcrel)
1437     {
1438       switch (code)
1439         {
1440         case BFD_RELOC_16:
1441           code = BFD_RELOC_16_PCREL;
1442           break;
1443
1444         case BFD_RELOC_16_PCREL:
1445           break;
1446
1447         default:
1448           BAD_CASE (code);
1449           return NULL;
1450         }
1451     }
1452
1453   reloc->howto = bfd_reloc_type_lookup (stdoutput, code);
1454
1455   if (reloc->howto == NULL)
1456     {
1457       as_bad_where (fixp->fx_file, fixp->fx_line,
1458                     _("Can not represent %s relocation in this object file format"),
1459                     bfd_get_reloc_code_name (code));
1460       return NULL;
1461     }
1462
1463   return reloc;
1464 }
1465
1466 void
1467 pseudo_bss (int c ATTRIBUTE_UNUSED)
1468 {
1469   int temp;
1470
1471   temp = get_absolute_expression ();
1472   subseg_set (bss_section, temp);
1473   demand_empty_rest_of_line ();
1474 }
1475
1476 void
1477 pseudo_even (int c ATTRIBUTE_UNUSED)
1478 {
1479   int alignment = 1; /* 2^1 */
1480   frag_align (alignment, 0, 1);
1481   record_alignment (now_seg, alignment);
1482 }
1483
1484 const char *
1485 md_atof (int type, char * litP, int * sizeP)
1486 {
1487   return vax_md_atof (type, litP, sizeP);
1488 }