gas/config/tc-z8k.c

   1 /* tc-z8k.c -- Assemble code for the Zilog Z800n
   2    Copyright 1992, 1993, 1994, 1995, 1996, 1998, 2000, 2001, 2002
   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 2, 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 the Free
  19    Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20    02111-1307, USA.  */
  21
  22 /* Written By Steve Chamberlain <sac@cygnus.com>.  */
  23
  24 #define DEFINE_TABLE
  25 #include <stdio.h>
  26
  27 #include "as.h"
  28 #include "bfd.h"
  29 #include "safe-ctype.h"
  30 #include "opcodes/z8k-opc.h"
  31
  32 const char comment_chars[] = "!";
  33 const char line_comment_chars[] = "#";
  34 const char line_separator_chars[] = ";";
  35
  36 extern int machine;
  37 extern int coff_flags;
  38 int segmented_mode;
  39 const int md_reloc_size;
  40
  41 void cons ();
  42
  43 void
  44 s_segm ()
  45 {
  46   segmented_mode = 1;
  47   machine = bfd_mach_z8001;
  48   coff_flags = F_Z8001;
  49 }
  50
  51 void
  52 s_unseg ()
  53 {
  54   segmented_mode = 0;
  55   machine = bfd_mach_z8002;
  56   coff_flags = F_Z8002;
  57 }
  58
  59 static void
  60 even ()
  61 {
  62   frag_align (1, 0, 0);
  63   record_alignment (now_seg, 1);
  64 }
  65
  66 void obj_coff_section ();
  67
  68 int
  69 tohex (c)
  70      int c;
  71 {
  72   if (ISDIGIT (c))
  73     return c - '0';
  74   if (ISLOWER (c))
  75     return c - 'a' + 10;
  76   return c - 'A' + 10;
  77 }
  78
  79 void
  80 sval ()
  81 {
  82   SKIP_WHITESPACE ();
  83   if (*input_line_pointer == '\'')
  84     {
  85       int c;
  86       input_line_pointer++;
  87       c = *input_line_pointer++;
  88       while (c != '\'')
  89         {
  90           if (c == '%')
  91             {
  92               c = (tohex (input_line_pointer[0]) << 4)
  93                 | tohex (input_line_pointer[1]);
  94               input_line_pointer += 2;
  95             }
  96           FRAG_APPEND_1_CHAR (c);
  97           c = *input_line_pointer++;
  98         }
  99       demand_empty_rest_of_line ();
 100     }
 101 }
 102
 103 /* This table describes all the machine specific pseudo-ops the assembler
 104    has to support.  The fields are:
 105    pseudo-op name without dot
 106    function to call to execute this pseudo-op
 107    Integer arg to pass to the function
 108    */
 109
 110 const pseudo_typeS md_pseudo_table[] = {
 111   {"int"    , cons            , 2},
 112   {"data.b" , cons            , 1},
 113   {"data.w" , cons            , 2},
 114   {"data.l" , cons            , 4},
 115   {"form"   , listing_psize   , 0},
 116   {"heading", listing_title   , 0},
 117   {"import" , s_ignore        , 0},
 118   {"page"   , listing_eject   , 0},
 119   {"program", s_ignore        , 0},
 120   {"z8001"  , s_segm          , 0},
 121   {"z8002"  , s_unseg         , 0},
 122
 123   {"segm"   , s_segm          , 0},
 124   {"unsegm" , s_unseg         , 0},
 125   {"unseg"  , s_unseg         , 0},
 126   {"name"   , s_app_file      , 0},
 127   {"global" , s_globl         , 0},
 128   {"wval"   , cons            , 2},
 129   {"lval"   , cons            , 4},
 130   {"bval"   , cons            , 1},
 131   {"sval"   , sval            , 0},
 132   {"rsect"  , obj_coff_section, 0},
 133   {"sect"   , obj_coff_section, 0},
 134   {"block"  , s_space         , 0},
 135   {"even"   , even            , 0},
 136   {0        , 0               , 0}
 137 };
 138
 139 const char EXP_CHARS[] = "eE";
 140
 141 /* Chars that mean this number is a floating point constant.
 142    As in 0f12.456
 143    or    0d1.2345e12  */
 144 const char FLT_CHARS[] = "rRsSfFdDxXpP";
 145
 146 /* Opcode mnemonics.  */
 147 static struct hash_control *opcode_hash_control;
 148
 149 void
 150 md_begin ()
 151 {
 152   opcode_entry_type *opcode;
 153   char *prev_name = "";
 154   int idx = 0;
 155
 156   opcode_hash_control = hash_new ();
 157
 158   for (opcode = z8k_table; opcode->name; opcode++)
 159     {
 160       /* Only enter unique codes into the table.  */
 161       if (strcmp (opcode->name, prev_name))
 162         {
 163           hash_insert (opcode_hash_control, opcode->name, (char *) opcode);
 164           idx++;
 165         }
 166       opcode->idx = idx;
 167       prev_name = opcode->name;
 168     }
 169
 170   /* Default to z8002.  */
 171   s_unseg ();
 172
 173   /* Insert the pseudo ops, too.  */
 174   for (idx = 0; md_pseudo_table[idx].poc_name; idx++)
 175     {
 176       opcode_entry_type *fake_opcode;
 177       fake_opcode = (opcode_entry_type *) malloc (sizeof (opcode_entry_type));
 178       fake_opcode->name = md_pseudo_table[idx].poc_name;
 179       fake_opcode->func = (void *) (md_pseudo_table + idx);
 180       fake_opcode->opcode = 250;
 181       hash_insert (opcode_hash_control, fake_opcode->name, fake_opcode);
 182     }
 183
 184   linkrelax = 1;
 185 }
 186
 187 struct z8k_exp {
 188   char *e_beg;
 189   char *e_end;
 190   expressionS e_exp;
 191 };
 192
 193 typedef struct z8k_op {
 194   /* 'b','w','r','q'.  */
 195   char regsize;
 196
 197   /* 0 .. 15.  */
 198   unsigned int reg;
 199
 200   int mode;
 201
 202   /* Any other register associated with the mode.  */
 203   unsigned int x_reg;
 204
 205   /* Any expression.  */
 206   expressionS exp;
 207 } op_type;
 208
 209 static expressionS *da_operand;
 210 static expressionS *imm_operand;
 211
 212 int reg[16];
 213 int the_cc;
 214 int the_ctrl;
 215 int the_flags;
 216 int the_interrupt;
 217
 218 char *
 219 whatreg (reg, src)
 220      int *reg;
 221      char *src;
 222 {
 223   if (ISDIGIT (src[1]))
 224     {
 225       *reg = (src[0] - '0') * 10 + src[1] - '0';
 226       return src + 2;
 227     }
 228   else
 229     {
 230       *reg = (src[0] - '0');
 231       return src + 1;
 232     }
 233 }
 234
 235 /* Parse operands
 236
 237    rh0-rh7, rl0-rl7
 238    r0-r15
 239    rr0-rr14
 240    rq0--rq12
 241    WREG r0,r1,r2,r3,r4,r5,r6,r7,fp,sp
 242    r0l,r0h,..r7l,r7h
 243    @WREG
 244    @WREG+
 245    @-WREG
 246    #const
 247 */
 248
 249 /* Try to parse a reg name.  Return a pointer to the first character
 250    in SRC after the reg name.  */
 251
 252 char *
 253 parse_reg (src, mode, reg)
 254      char *src;
 255      int *mode;
 256      unsigned int *reg;
 257 {
 258   char *res = 0;
 259   char regno;
 260
 261   if (src[0] == 's' && src[1] == 'p' && (src[2] == 0 || src[2] == ','))
 262     {
 263       if (segmented_mode)
 264         {
 265           *mode = CLASS_REG_LONG;
 266           *reg = 14;
 267         }
 268       else
 269         {
 270           *mode = CLASS_REG_WORD;
 271           *reg = 15;
 272         }
 273       return src + 2;
 274     }
 275   if (src[0] == 'r')
 276     {
 277       if (src[1] == 'r')
 278         {
 279           if (src[2] < '0' || src[2] > '9')
 280             return res;  /* Assume no register name but a label starting with 'rr'.  */
 281           *mode = CLASS_REG_LONG;
 282           res = whatreg (reg, src + 2);
 283           regno = *reg;
 284           if (regno > 14)
 285             as_warn (_("register rr%d, out of range."), regno);
 286         }
 287       else if (src[1] == 'h')
 288         {
 289           if (src[2] < '0' || src[2] > '9')
 290             return res;  /* Assume no register name but a label starting with 'rh'.  */
 291           *mode = CLASS_REG_BYTE;
 292           res = whatreg (reg, src + 2);
 293           regno = *reg;
 294           if (regno > 7)
 295             as_warn (_("register rh%d, out of range."), regno);
 296         }
 297       else if (src[1] == 'l')
 298         {
 299           if (src[2] < '0' || src[2] > '9')
 300             return res;  /* Assume no register name but a label starting with 'rl'.  */
 301           *mode = CLASS_REG_BYTE;
 302           res = whatreg (reg, src + 2);
 303           regno = *reg;
 304           if (regno > 7)
 305             as_warn (_("register rl%d, out of range."), regno);
 306           *reg += 8;
 307         }
 308       else if (src[1] == 'q')
 309         {
 310           if (src[2] < '0' || src[2] > '9')
 311             return res;  /* Assume no register name but a label starting with 'rq'.  */
 312           *mode = CLASS_REG_QUAD;
 313           res = whatreg (reg, src + 2);
 314           regno = *reg;
 315           if (regno > 12)
 316             as_warn (_("register rq%d, out of range."), regno);
 317         }
 318       else
 319         {
 320           if (src[1] < '0' || src[1] > '9')
 321             return res;  /* Assume no register name but a label starting with 'r'.  */
 322           *mode = CLASS_REG_WORD;
 323           res = whatreg (reg, src + 1);
 324           regno = *reg;
 325           if (regno > 15)
 326             as_warn (_("register r%d, out of range."), regno);
 327         }
 328     }
 329   return res;
 330 }
 331
 332 char *
 333 parse_exp (s, op)
 334      char *s;
 335      expressionS *op;
 336 {
 337   char *save = input_line_pointer;
 338   char *new;
 339
 340   input_line_pointer = s;
 341   expression (op);
 342   if (op->X_op == O_absent)
 343     as_bad (_("missing operand"));
 344   new = input_line_pointer;
 345   input_line_pointer = save;
 346   return new;
 347 }
 348
 349 /* The many forms of operand:
 350
 351    <rb>
 352    <r>
 353    <rr>
 354    <rq>
 355    @r
 356    #exp
 357    exp
 358    exp(r)
 359    r(#exp)
 360    r(r)
 361    */
 362
 363 static char *
 364 checkfor (ptr, what)
 365      char *ptr;
 366      char what;
 367 {
 368   if (*ptr == what)
 369     ptr++;
 370   else
 371     as_bad (_("expected %c"), what);
 372
 373   return ptr;
 374 }
 375
 376 /* Make sure the mode supplied is the size of a word.  */
 377
 378 static void
 379 regword (mode, string)
 380      int mode;
 381      char *string;
 382 {
 383   int ok;
 384
 385   ok = CLASS_REG_WORD;
 386   if (ok != mode)
 387     {
 388       as_bad (_("register is wrong size for a word %s"), string);
 389     }
 390 }
 391
 392 /* Make sure the mode supplied is the size of an address.  */
 393
 394 static void
 395 regaddr (mode, string)
 396      int mode;
 397      char *string;
 398 {
 399   int ok;
 400
 401   ok = segmented_mode ? CLASS_REG_LONG : CLASS_REG_WORD;
 402   if (ok != mode)
 403     {
 404       as_bad (_("register is wrong size for address %s"), string);
 405     }
 406 }
 407
 408 struct ctrl_names {
 409   int value;
 410   char *name;
 411 };
 412
 413 struct ctrl_names ctrl_table[] = {
 414   { 0x2, "fcw" },
 415   { 0x3, "refresh" },
 416   { 0x4, "psapseg" },
 417   { 0x5, "psapoff" },
 418   { 0x5, "psap" },
 419   { 0x6, "nspseg" },
 420   { 0x7, "nspoff" },
 421   { 0x7, "nsp" },
 422   { 0  , 0 }
 423 };
 424
 425 static void
 426 get_ctrl_operand (ptr, mode, dst)
 427      char **ptr;
 428      struct z8k_op *mode;
 429      unsigned int dst ATTRIBUTE_UNUSED;
 430 {
 431   char *src = *ptr;
 432   int i;
 433
 434   while (*src == ' ')
 435     src++;
 436
 437   mode->mode = CLASS_CTRL;
 438   for (i = 0; ctrl_table[i].name; i++)
 439     {
 440       int j;
 441
 442       for (j = 0; ctrl_table[i].name[j]; j++)
 443         {
 444           if (ctrl_table[i].name[j] != src[j])
 445             goto fail;
 446         }
 447       the_ctrl = ctrl_table[i].value;
 448       *ptr = src + j;
 449       return;
 450     fail:
 451       ;
 452     }
 453   the_ctrl = 0;
 454   return;
 455 }
 456
 457 struct flag_names {
 458   int value;
 459   char *name;
 460
 461 };
 462
 463 struct flag_names flag_table[] = {
 464   { 0x1, "p" },
 465   { 0x1, "v" },
 466   { 0x2, "s" },
 467   { 0x4, "z" },
 468   { 0x8, "c" },
 469   { 0x0, "+" },
 470   { 0, 0 }
 471 };
 472
 473 static void
 474 get_flags_operand (ptr, mode, dst)
 475      char **ptr;
 476      struct z8k_op *mode;
 477      unsigned int dst ATTRIBUTE_UNUSED;
 478 {
 479   char *src = *ptr;
 480   int i;
 481   int j;
 482
 483   while (*src == ' ')
 484     src++;
 485
 486   mode->mode = CLASS_FLAGS;
 487   the_flags = 0;
 488   for (j = 0; j <= 9; j++)
 489     {
 490       if (!src[j])
 491         goto done;
 492       for (i = 0; flag_table[i].name; i++)
 493         {
 494           if (flag_table[i].name[0] == src[j])
 495             {
 496               the_flags = the_flags | flag_table[i].value;
 497               goto match;
 498             }
 499         }
 500       goto done;
 501     match:
 502       ;
 503     }
 504  done:
 505   *ptr = src + j;
 506   return;
 507 }
 508
 509 struct interrupt_names {
 510   int value;
 511   char *name;
 512
 513 };
 514
 515 struct interrupt_names intr_table[] = {
 516   { 0x1, "nvi" },
 517   { 0x2, "vi" },
 518   { 0x3, "both" },
 519   { 0x3, "all" },
 520   { 0, 0 }
 521 };
 522
 523 static void
 524 get_interrupt_operand (ptr, mode, dst)
 525      char **ptr;
 526      struct z8k_op *mode;
 527      unsigned int dst ATTRIBUTE_UNUSED;
 528 {
 529   char *src = *ptr;
 530   int i;
 531
 532   while (*src == ' ')
 533     src++;
 534
 535   mode->mode = CLASS_IMM;
 536   for (i = 0; intr_table[i].name; i++)
 537     {
 538       int j;
 539
 540       for (j = 0; intr_table[i].name[j]; j++)
 541         {
 542           if (intr_table[i].name[j] != src[j])
 543             goto fail;
 544         }
 545       the_interrupt = intr_table[i].value;
 546       *ptr = src + j;
 547       return;
 548     fail:
 549       ;
 550     }
 551   the_interrupt = 0x0;
 552   return;
 553 }
 554
 555 struct cc_names {
 556   int value;
 557   char *name;
 558
 559 };
 560
 561 struct cc_names table[] = {
 562   { 0x0, "f" },
 563   { 0x1, "lt" },
 564   { 0x2, "le" },
 565   { 0x3, "ule" },
 566   { 0x4, "ov" },
 567   { 0x4, "pe" },
 568   { 0x5, "mi" },
 569   { 0x6, "eq" },
 570   { 0x6, "z" },
 571   { 0x7, "c" },
 572   { 0x7, "ult" },
 573   { 0x8, "t" },
 574   { 0x9, "ge" },
 575   { 0xa, "gt" },
 576   { 0xb, "ugt" },
 577   { 0xc, "nov" },
 578   { 0xc, "po" },
 579   { 0xd, "pl" },
 580   { 0xe, "ne" },
 581   { 0xe, "nz" },
 582   { 0xf, "nc" },
 583   { 0xf, "uge" },
 584   { 0  ,  0 }
 585 };
 586
 587 static void
 588 get_cc_operand (ptr, mode, dst)
 589      char **ptr;
 590      struct z8k_op *mode;
 591      unsigned int dst ATTRIBUTE_UNUSED;
 592 {
 593   char *src = *ptr;
 594   int i;
 595
 596   while (*src == ' ')
 597     src++;
 598
 599   mode->mode = CLASS_CC;
 600   for (i = 0; table[i].name; i++)
 601     {
 602       int j;
 603
 604       for (j = 0; table[i].name[j]; j++)
 605         {
 606           if (table[i].name[j] != src[j])
 607             goto fail;
 608         }
 609       the_cc = table[i].value;
 610       *ptr = src + j;
 611       return;
 612     fail:
 613       ;
 614     }
 615   the_cc = 0x8;
 616 }
 617
 618 static void
 619 get_operand (ptr, mode, dst)
 620      char **ptr;
 621      struct z8k_op *mode;
 622      unsigned int dst ATTRIBUTE_UNUSED;
 623 {
 624   char *src = *ptr;
 625   char *end;
 626
 627   mode->mode = 0;
 628
 629   while (*src == ' ')
 630     src++;
 631   if (*src == '#')
 632     {
 633       mode->mode = CLASS_IMM;
 634       imm_operand = &(mode->exp);
 635       src = parse_exp (src + 1, &(mode->exp));
 636     }
 637   else if (*src == '@')
 638     {
 639       int d;
 640
 641       mode->mode = CLASS_IR;
 642       src = parse_reg (src + 1, &d, &mode->reg);
 643     }
 644   else
 645     {
 646       int regn;
 647
 648       end = parse_reg (src, &mode->mode, &regn);
 649
 650       if (end)
 651         {
 652           int nw, nr;
 653
 654           src = end;
 655           if (*src == '(')
 656             {
 657               src++;
 658               end = parse_reg (src, &nw, &nr);
 659               if (end)
 660                 {
 661                   /* Got Ra(Rb).  */
 662                   src = end;
 663
 664                   if (*src != ')')
 665                     as_bad (_("Missing ) in ra(rb)"));
 666                   else
 667                     src++;
 668
 669                   regaddr (mode->mode, "ra(rb) ra");
 670 #if 0
 671                   regword (mode->mode, "ra(rb) rb");
 672 #endif
 673                   mode->mode = CLASS_BX;
 674                   mode->reg = regn;
 675                   mode->x_reg = nr;
 676                   reg[ARG_RX] = nr;
 677                 }
 678               else
 679                 {
 680                   /* Got Ra(disp).  */
 681                   if (*src == '#')
 682                     src++;
 683                   src = parse_exp (src, &(mode->exp));
 684                   src = checkfor (src, ')');
 685                   mode->mode = CLASS_BA;
 686                   mode->reg = regn;
 687                   mode->x_reg = 0;
 688                   imm_operand = &(mode->exp);
 689                 }
 690             }
 691           else
 692             {
 693               mode->reg = regn;
 694               mode->x_reg = 0;
 695             }
 696         }
 697       else
 698         {
 699           /* No initial reg.  */
 700           src = parse_exp (src, &(mode->exp));
 701           if (*src == '(')
 702             {
 703               src++;
 704               end = parse_reg (src, &(mode->mode), &regn);
 705               regword (mode->mode, "addr(Ra) ra");
 706               mode->mode = CLASS_X;
 707               mode->reg = regn;
 708               mode->x_reg = 0;
 709               da_operand = &(mode->exp);
 710               src = checkfor (end, ')');
 711             }
 712           else
 713             {
 714               /* Just an address.  */
 715               mode->mode = CLASS_DA;
 716               mode->reg = 0;
 717               mode->x_reg = 0;
 718               da_operand = &(mode->exp);
 719             }
 720         }
 721     }
 722   *ptr = src;
 723 }
 724
 725 static char *
 726 get_operands (opcode, op_end, operand)
 727      opcode_entry_type *opcode;
 728      char *op_end;
 729      op_type *operand;
 730 {
 731   char *ptr = op_end;
 732   char *savptr;
 733
 734   ptr++;
 735   switch (opcode->noperands)
 736     {
 737     case 0:
 738       operand[0].mode = 0;
 739       operand[1].mode = 0;
 740       break;
 741
 742     case 1:
 743       if (opcode->arg_info[0] == CLASS_CC)
 744         get_cc_operand (&ptr, operand + 0, 0);
 745
 746       else if (opcode->arg_info[0] == CLASS_FLAGS)
 747         get_flags_operand (&ptr, operand + 0, 0);
 748
 749       else if (opcode->arg_info[0] == (CLASS_IMM + (ARG_IMM2)))
 750         get_interrupt_operand (&ptr, operand + 0, 0);
 751
 752       else
 753         get_operand (&ptr, operand + 0, 0);
 754
 755       operand[1].mode = 0;
 756       break;
 757
 758     case 2:
 759       savptr = ptr;
 760       if (opcode->arg_info[0] == CLASS_CC)
 761         get_cc_operand (&ptr, operand + 0, 0);
 762
 763       else if (opcode->arg_info[0] == CLASS_CTRL)
 764         {
 765           get_ctrl_operand (&ptr, operand + 0, 0);
 766
 767           if (the_ctrl == 0)
 768             {
 769               ptr = savptr;
 770               get_operand (&ptr, operand + 0, 0);
 771
 772               if (ptr == 0)
 773                 return NULL;
 774               if (*ptr == ',')
 775                 ptr++;
 776               get_ctrl_operand (&ptr, operand + 1, 1);
 777               return ptr;
 778             }
 779         }
 780       else
 781         get_operand (&ptr, operand + 0, 0);
 782
 783       if (ptr == 0)
 784         return NULL;
 785       if (*ptr == ',')
 786         ptr++;
 787       get_operand (&ptr, operand + 1, 1);
 788       break;
 789
 790     case 3:
 791       get_operand (&ptr, operand + 0, 0);
 792       if (*ptr == ',')
 793         ptr++;
 794       get_operand (&ptr, operand + 1, 1);
 795       if (*ptr == ',')
 796         ptr++;
 797       get_operand (&ptr, operand + 2, 2);
 798       break;
 799
 800     case 4:
 801       get_operand (&ptr, operand + 0, 0);
 802       if (*ptr == ',')
 803         ptr++;
 804       get_operand (&ptr, operand + 1, 1);
 805       if (*ptr == ',')
 806         ptr++;
 807       get_operand (&ptr, operand + 2, 2);
 808       if (*ptr == ',')
 809         ptr++;
 810       get_cc_operand (&ptr, operand + 3, 3);
 811       break;
 812
 813     default:
 814       abort ();
 815     }
 816
 817   return ptr;
 818 }
 819
 820 /* Passed a pointer to a list of opcodes which use different
 821    addressing modes.  Return the opcode which matches the opcodes
 822    provided.  */
 823
 824 static opcode_entry_type *
 825 get_specific (opcode, operands)
 826      opcode_entry_type *opcode;
 827      op_type *operands;
 828
 829 {
 830   opcode_entry_type *this_try = opcode;
 831   int found = 0;
 832   unsigned int noperands = opcode->noperands;
 833
 834   int this_index = opcode->idx;
 835
 836   while (this_index == opcode->idx && !found)
 837     {
 838       unsigned int i;
 839
 840       this_try = opcode++;
 841       for (i = 0; i < noperands; i++)
 842         {
 843           unsigned int mode = operands[i].mode;
 844
 845           if ((mode & CLASS_MASK) != (this_try->arg_info[i] & CLASS_MASK))
 846             {
 847               /* It could be an pc rel operand, if this is a da mode
 848                  and we like disps, then insert it.  */
 849
 850               if (mode == CLASS_DA && this_try->arg_info[i] == CLASS_DISP)
 851                 {
 852                   /* This is the case.  */
 853                   operands[i].mode = CLASS_DISP;
 854                 }
 855               else if (mode == CLASS_BA && this_try->arg_info[i])
 856                 {
 857                   /* Can't think of a way to turn what we've been
 858                      given into something that's OK.  */
 859                   goto fail;
 860                 }
 861               else if (this_try->arg_info[i] & CLASS_PR)
 862                 {
 863                   if (mode == CLASS_REG_LONG && segmented_mode)
 864                     {
 865                       /* OK.  */
 866                     }
 867                   else if (mode == CLASS_REG_WORD && !segmented_mode)
 868                     {
 869                       /* OK.  */
 870                     }
 871                   else
 872                     goto fail;
 873                 }
 874               else
 875                 goto fail;
 876             }
 877           switch (mode & CLASS_MASK)
 878             {
 879             default:
 880               break;
 881             case CLASS_X:
 882             case CLASS_IR:
 883             case CLASS_BA:
 884             case CLASS_BX:
 885             case CLASS_DISP:
 886             case CLASS_REG:
 887             case CLASS_REG_WORD:
 888             case CLASS_REG_BYTE:
 889             case CLASS_REG_QUAD:
 890             case CLASS_REG_LONG:
 891             case CLASS_REGN0:
 892               reg[this_try->arg_info[i] & ARG_MASK] = operands[i].reg;
 893               break;
 894             }
 895         }
 896
 897       found = 1;
 898     fail:
 899       ;
 900     }
 901   if (found)
 902     return this_try;
 903   else
 904     return 0;
 905 }
 906
 907 #if 0 /* Not used.  */
 908 static void
 909 check_operand (operand, width, string)
 910      struct z8k_op *operand;
 911      unsigned int width;
 912      char *string;
 913 {
 914   if (operand->exp.X_add_symbol == 0
 915       && operand->exp.X_op_symbol == 0)
 916     {
 917
 918       /* No symbol involved, let's look at offset, it's dangerous if
 919          any of the high bits are not 0 or ff's, find out by oring or
 920          anding with the width and seeing if the answer is 0 or all
 921          fs.  */
 922       if ((operand->exp.X_add_number & ~width) != 0 &&
 923           (operand->exp.X_add_number | width) != (~0))
 924         {
 925           as_warn (_("operand %s0x%x out of range."),
 926                    string, operand->exp.X_add_number);
 927         }
 928     }
 929
 930 }
 931 #endif
 932
 933 static char buffer[20];
 934
 935 static void
 936 newfix (ptr, type, operand)
 937      int ptr;
 938      int type;
 939      expressionS *operand;
 940 {
 941   if (operand->X_add_symbol
 942       || operand->X_op_symbol
 943       || operand->X_add_number)
 944     {
 945       fix_new_exp (frag_now,
 946                    ptr,
 947                    1,
 948                    operand,
 949                    0,
 950                    type);
 951     }
 952 }
 953
 954 static char *
 955 apply_fix (ptr, type, operand, size)
 956      char *ptr;
 957      int type;
 958      expressionS *operand;
 959      int size;
 960 {
 961   int n = operand->X_add_number;
 962
 963   newfix ((ptr - buffer) / 2, type, operand);
 964   switch (size)
 965     {
 966     case 8:                     /* 8 nibbles == 32 bits.  */
 967       *ptr++ = n >> 28;
 968       *ptr++ = n >> 24;
 969       *ptr++ = n >> 20;
 970       *ptr++ = n >> 16;
 971     case 4:                     /* 4 nibbles == 16 bits.  */
 972       *ptr++ = n >> 12;
 973       *ptr++ = n >> 8;
 974     case 2:
 975       *ptr++ = n >> 4;
 976     case 1:
 977       *ptr++ = n >> 0;
 978       break;
 979     }
 980   return ptr;
 981 }
 982
 983 /* Now we know what sort of opcodes it is.  Let's build the bytes.  */
 984
 985 #define INSERT(x,y) *x++ = y>>24; *x++ = y>> 16; *x++=y>>8; *x++ =y;
 986
 987 static void
 988 build_bytes (this_try, operand)
 989      opcode_entry_type *this_try;
 990      struct z8k_op *operand ATTRIBUTE_UNUSED;
 991 {
 992   char *output_ptr = buffer;
 993   int c;
 994   int nib;
 995   int nibble;
 996   unsigned int *class_ptr;
 997
 998   frag_wane (frag_now);
 999   frag_new (0);
1000
1001   memset (buffer, 0, sizeof (buffer));
1002   class_ptr = this_try->byte_info;
1003
1004   for (nibble = 0; (c = *class_ptr++); nibble++)
1005     {
1006
1007       switch (c & CLASS_MASK)
1008         {
1009         default:
1010           abort ();
1011
1012         case CLASS_ADDRESS:
1013           /* Direct address, we don't cope with the SS mode right now.  */
1014           if (segmented_mode)
1015             {
1016               /* da_operand->X_add_number |= 0x80000000;  --  Now set at relocation time.  */
1017               output_ptr = apply_fix (output_ptr, R_IMM32, da_operand, 8);
1018             }
1019           else
1020             {
1021               output_ptr = apply_fix (output_ptr, R_IMM16, da_operand, 4);
1022             }
1023           da_operand = 0;
1024           break;
1025         case CLASS_DISP8:
1026           /* pc rel 8 bit  */
1027           output_ptr = apply_fix (output_ptr, R_JR, da_operand, 2);
1028           da_operand = 0;
1029           break;
1030
1031         case CLASS_0DISP7:
1032           /* pc rel 7 bit  */
1033           *output_ptr = 0;
1034           output_ptr = apply_fix (output_ptr, R_DISP7, da_operand, 2);
1035           da_operand = 0;
1036           break;
1037
1038         case CLASS_1DISP7:
1039           /* pc rel 7 bit  */
1040           *output_ptr = 0x80;
1041           output_ptr = apply_fix (output_ptr, R_DISP7, da_operand, 2);
1042           output_ptr[-2] = 0x8;
1043           da_operand = 0;
1044           break;
1045
1046         case CLASS_BIT_1OR2:
1047           *output_ptr = c & 0xf;
1048           if (imm_operand)
1049             {
1050               if (imm_operand->X_add_number == 2)
1051                 *output_ptr |= 2;
1052               else if (imm_operand->X_add_number != 1)
1053                 as_bad (_("immediate must be 1 or 2"));
1054             }
1055           else
1056             as_bad (_("immediate 1 or 2 expected"));
1057           output_ptr++;
1058           break;
1059         case CLASS_CC:
1060           *output_ptr++ = the_cc;
1061           break;
1062         case CLASS_0CCC:
1063           *output_ptr++ = the_ctrl;
1064           break;
1065         case CLASS_1CCC:
1066           *output_ptr++ = the_ctrl | 0x8;
1067           break;
1068         case CLASS_00II:
1069           *output_ptr++ = (~the_interrupt & 0x3);
1070           break;
1071         case CLASS_01II:
1072           *output_ptr++ = (~the_interrupt & 0x3) | 0x4;
1073           break;
1074         case CLASS_FLAGS:
1075           *output_ptr++ = the_flags;
1076           break;
1077         case CLASS_IGNORE:
1078         case CLASS_BIT:
1079           *output_ptr++ = c & 0xf;
1080           break;
1081         case CLASS_REGN0:
1082           if (reg[c & 0xf] == 0)
1083             as_bad (_("can't use R0 here"));
1084           /* Fall through.  */
1085         case CLASS_REG:
1086         case CLASS_REG_BYTE:
1087         case CLASS_REG_WORD:
1088         case CLASS_REG_LONG:
1089         case CLASS_REG_QUAD:
1090           /* Insert bit mattern of right reg.  */
1091           *output_ptr++ = reg[c & 0xf];
1092           break;
1093         case CLASS_DISP:
1094           switch (c & ARG_MASK)
1095             {
1096             case ARG_DISP12:
1097               output_ptr = apply_fix (output_ptr, R_CALLR, da_operand, 4);
1098               break;
1099             case ARG_DISP16:
1100               output_ptr = apply_fix (output_ptr, R_REL16, da_operand, 4);
1101               break;
1102             default:
1103               output_ptr = apply_fix (output_ptr, R_IMM16, da_operand, 4);
1104             }
1105           da_operand = 0;
1106           break;
1107
1108         case CLASS_IMM:
1109           {
1110             nib = 0;
1111             switch (c & ARG_MASK)
1112               {
1113               case ARG_NIM4:
1114                 imm_operand->X_add_number = -imm_operand->X_add_number;
1115                 /* Drop through.  */
1116               case ARG_IMM4:
1117                 output_ptr = apply_fix (output_ptr, R_IMM4L, imm_operand, 1);
1118                 break;
1119               case ARG_IMM4M1:
1120                 imm_operand->X_add_number--;
1121                 output_ptr = apply_fix (output_ptr, R_IMM4L, imm_operand, 1);
1122                 break;
1123               case ARG_IMMNMINUS1:
1124                 imm_operand->X_add_number--;
1125                 output_ptr = apply_fix (output_ptr, R_IMM4L, imm_operand, 1);
1126                 break;
1127               case ARG_NIM8:
1128                 imm_operand->X_add_number = -imm_operand->X_add_number;
1129               case ARG_IMM8:
1130                 output_ptr = apply_fix (output_ptr, R_IMM8, imm_operand, 2);
1131                 break;
1132               case ARG_IMM16:
1133                 output_ptr = apply_fix (output_ptr, R_IMM16, imm_operand, 4);
1134                 break;
1135
1136               case ARG_IMM32:
1137                 output_ptr = apply_fix (output_ptr, R_IMM32, imm_operand, 8);
1138                 break;
1139
1140               default:
1141                 abort ();
1142               }
1143           }
1144         }
1145     }
1146
1147   /* Copy from the nibble buffer into the frag.  */
1148   {
1149     int length = (output_ptr - buffer) / 2;
1150     char *src = buffer;
1151     char *fragp = frag_more (length);
1152
1153     while (src < output_ptr)
1154       {
1155         *fragp = (src[0] << 4) | src[1];
1156         src += 2;
1157         fragp++;
1158       }
1159   }
1160 }
1161
1162 /* This is the guts of the machine-dependent assembler.  STR points to a
1163    machine dependent instruction.  This function is supposed to emit
1164    the frags/bytes it assembles to.  */
1165
1166 void
1167 md_assemble (str)
1168      char *str;
1169 {
1170   char c;
1171   char *op_start;
1172   char *op_end;
1173   struct z8k_op operand[3];
1174   opcode_entry_type *opcode;
1175   opcode_entry_type *prev_opcode;
1176
1177   /* Drop leading whitespace.  */
1178   while (*str == ' ')
1179     str++;
1180
1181   /* Find the op code end.  */
1182   for (op_start = op_end = str;
1183        *op_end != 0 && *op_end != ' ';
1184        op_end++)
1185     ;
1186
1187   if (op_end == op_start)
1188     {
1189       as_bad (_("can't find opcode "));
1190     }
1191   c = *op_end;
1192
1193   *op_end = 0;
1194
1195   opcode = (opcode_entry_type *) hash_find (opcode_hash_control, op_start);
1196
1197   if (opcode == NULL)
1198     {
1199       as_bad (_("unknown opcode"));
1200       return;
1201     }
1202
1203   if (opcode->opcode == 250)
1204     {
1205       pseudo_typeS *p;
1206       char oc;
1207       char *old = input_line_pointer;
1208       *op_end = c;
1209
1210       /* Was really a pseudo op.  */
1211
1212       input_line_pointer = op_end;
1213
1214       oc = *old;
1215       *old = '\n';
1216       while (*input_line_pointer == ' ')
1217         input_line_pointer++;
1218       p = (pseudo_typeS *) (opcode->func);
1219
1220       (p->poc_handler) (p->poc_val);
1221       input_line_pointer = old;
1222       *old = oc;
1223     }
1224   else
1225     {
1226       char *new_input_line_pointer;
1227
1228       new_input_line_pointer = get_operands (opcode, op_end, operand);
1229       if (new_input_line_pointer)
1230         input_line_pointer = new_input_line_pointer;
1231       prev_opcode = opcode;
1232
1233       opcode = get_specific (opcode, operand);
1234
1235       if (opcode == 0)
1236         {
1237           /* Couldn't find an opcode which matched the operands.  */
1238           char *where = frag_more (2);
1239
1240           where[0] = 0x0;
1241           where[1] = 0x0;
1242
1243           as_bad (_("Can't find opcode to match operands"));
1244           return;
1245         }
1246
1247       build_bytes (opcode, operand);
1248     }
1249 }
1250
1251 void
1252 tc_crawl_symbol_chain (headers)
1253      object_headers *headers ATTRIBUTE_UNUSED;
1254 {
1255   printf (_("call to tc_crawl_symbol_chain \n"));
1256 }
1257
1258 symbolS *
1259 md_undefined_symbol (name)
1260      char *name ATTRIBUTE_UNUSED;
1261 {
1262   return 0;
1263 }
1264
1265 void
1266 tc_headers_hook (headers)
1267      object_headers *headers ATTRIBUTE_UNUSED;
1268 {
1269   printf (_("call to tc_headers_hook \n"));
1270 }
1271
1272 /* Various routines to kill one day.  */
1273 /* Equal to MAX_PRECISION in atof-ieee.c.  */
1274 #define MAX_LITTLENUMS 6
1275
1276 /* Turn a string in input_line_pointer into a floating point constant
1277    of type TYPE, and store the appropriate bytes in *LITP.  The number
1278    of LITTLENUMS emitted is stored in *SIZEP.  An error message is
1279    returned, or NULL on OK.  */
1280
1281 char *
1282 md_atof (type, litP, sizeP)
1283      char type;
1284      char *litP;
1285      int *sizeP;
1286 {
1287   int prec;
1288   LITTLENUM_TYPE words[MAX_LITTLENUMS];
1289   LITTLENUM_TYPE *wordP;
1290   char *t;
1291   char *atof_ieee ();
1292
1293   switch (type)
1294     {
1295     case 'f':
1296     case 'F':
1297     case 's':
1298     case 'S':
1299       prec = 2;
1300       break;
1301
1302     case 'd':
1303     case 'D':
1304     case 'r':
1305     case 'R':
1306       prec = 4;
1307       break;
1308
1309     case 'x':
1310     case 'X':
1311       prec = 6;
1312       break;
1313
1314     case 'p':
1315     case 'P':
1316       prec = 6;
1317       break;
1318
1319     default:
1320       *sizeP = 0;
1321       return _("Bad call to MD_ATOF()");
1322     }
1323   t = atof_ieee (input_line_pointer, type, words);
1324   if (t)
1325     input_line_pointer = t;
1326
1327   *sizeP = prec * sizeof (LITTLENUM_TYPE);
1328   for (wordP = words; prec--;)
1329     {
1330       md_number_to_chars (litP, (long) (*wordP++), sizeof (LITTLENUM_TYPE));
1331       litP += sizeof (LITTLENUM_TYPE);
1332     }
1333   return 0;
1334 }
1335 \f
1336 const char *md_shortopts = "z:";
1337
1338 struct option md_longopts[] =
1339   {
1340     {NULL, no_argument, NULL, 0}
1341   };
1342
1343 size_t md_longopts_size = sizeof (md_longopts);
1344
1345 int
1346 md_parse_option (c, arg)
1347      int c;
1348      char *arg;
1349 {
1350   switch (c)
1351     {
1352     case 'z':
1353       if (!strcmp (arg, "8001"))
1354         s_segm ();
1355       else if (!strcmp (arg, "8002"))
1356         s_unseg ();
1357       else
1358         {
1359           as_bad (_("invalid architecture -z%s"), arg);
1360           return 0;
1361         }
1362       break;
1363
1364     default:
1365       return 0;
1366     }
1367
1368   return 1;
1369 }
1370
1371 void
1372 md_show_usage (stream)
1373      FILE *stream;
1374 {
1375   fprintf (stream, _("\
1376 Z8K options:\n\
1377 -z8001                  generate segmented code\n\
1378 -z8002                  generate unsegmented code\n"));
1379 }
1380 \f
1381 void
1382 tc_aout_fix_to_chars ()
1383 {
1384   printf (_("call to tc_aout_fix_to_chars \n"));
1385   abort ();
1386 }
1387
1388 void
1389 md_convert_frag (headers, seg, fragP)
1390      object_headers *headers ATTRIBUTE_UNUSED;
1391      segT seg ATTRIBUTE_UNUSED;
1392      fragS *fragP ATTRIBUTE_UNUSED;
1393 {
1394   printf (_("call to md_convert_frag \n"));
1395   abort ();
1396 }
1397
1398 valueT
1399 md_section_align (seg, size)
1400      segT seg;
1401      valueT size;
1402 {
1403   return ((size + (1 << section_alignment[(int) seg]) - 1)
1404           & (-1 << section_alignment[(int) seg]));
1405 }
1406
1407 void
1408 md_apply_fix3 (fixP, valP, segment)
1409      fixS * fixP;
1410      valueT * valP;
1411      segT segment ATTRIBUTE_UNUSED;
1412 {
1413   long val = * (long *) valP;
1414   char *buf = fixP->fx_where + fixP->fx_frag->fr_literal;
1415
1416   switch (fixP->fx_r_type)
1417     {
1418     case R_IMM4L:
1419       buf[0] = (buf[0] & 0xf0) | ((buf[0] + val) & 0xf);
1420       break;
1421
1422     case R_JR:
1423
1424       *buf++ = val;
1425 #if 0
1426       if (val != 0)
1427         abort ();
1428 #endif
1429       break;
1430
1431     case R_DISP7:
1432
1433       *buf++ += val;
1434 #if 0
1435       if (val != 0)
1436         abort ();
1437 #endif
1438       break;
1439
1440     case R_IMM8:
1441       buf[0] += val;
1442       break;
1443     case R_IMM16:
1444       *buf++ = (val >> 8);
1445       *buf++ = val;
1446       break;
1447     case R_IMM32:
1448       *buf++ = (val >> 24);
1449       *buf++ = (val >> 16);
1450       *buf++ = (val >> 8);
1451       *buf++ = val;
1452       break;
1453 #if 0
1454     case R_DA | R_SEG:
1455       *buf++ = (val >> 16);
1456       *buf++ = 0x00;
1457       *buf++ = (val >> 8);
1458       *buf++ = val;
1459       break;
1460 #endif
1461
1462     case 0:
1463       md_number_to_chars (buf, val, fixP->fx_size);
1464       break;
1465
1466     default:
1467       abort ();
1468     }
1469
1470   if (fixP->fx_addsy == NULL && fixP->fx_pcrel == 0)
1471     fixP->fx_done = 1;
1472 }
1473
1474 int
1475 md_estimate_size_before_relax (fragP, segment_type)
1476      register fragS *fragP ATTRIBUTE_UNUSED;
1477      register segT segment_type ATTRIBUTE_UNUSED;
1478 {
1479   printf (_("call tomd_estimate_size_before_relax\n"));
1480   abort ();
1481 }
1482
1483 /* Put number into target byte order.  */
1484
1485 void
1486 md_number_to_chars (ptr, use, nbytes)
1487      char *ptr;
1488      valueT use;
1489      int nbytes;
1490 {
1491   number_to_chars_bigendian (ptr, use, nbytes);
1492 }
1493
1494 long
1495 md_pcrel_from (fixP)
1496      fixS *fixP ATTRIBUTE_UNUSED;
1497 {
1498   abort ();
1499 }
1500
1501 void
1502 tc_coff_symbol_emit_hook (s)
1503      symbolS *s ATTRIBUTE_UNUSED;
1504 {
1505 }
1506
1507 void
1508 tc_reloc_mangle (fix_ptr, intr, base)
1509      fixS *fix_ptr;
1510      struct internal_reloc *intr;
1511      bfd_vma base;
1512
1513 {
1514   symbolS *symbol_ptr;
1515
1516   if (fix_ptr->fx_addsy
1517       && fix_ptr->fx_subsy)
1518     {
1519       symbolS *add = fix_ptr->fx_addsy;
1520       symbolS *sub = fix_ptr->fx_subsy;
1521
1522       if (S_GET_SEGMENT (add) != S_GET_SEGMENT (sub))
1523         as_bad (_("Can't subtract symbols in different sections %s %s"),
1524                 S_GET_NAME (add), S_GET_NAME (sub));
1525       else
1526         {
1527           int diff = S_GET_VALUE (add) - S_GET_VALUE (sub);
1528
1529           fix_ptr->fx_addsy = 0;
1530           fix_ptr->fx_subsy = 0;
1531           fix_ptr->fx_offset += diff;
1532         }
1533     }
1534   symbol_ptr = fix_ptr->fx_addsy;
1535
1536   /* If this relocation is attached to a symbol then it's ok
1537      to output it.  */
1538   if (fix_ptr->fx_r_type == 0)
1539     {
1540       /* cons likes to create reloc32's whatever the size of the reloc.  */
1541       switch (fix_ptr->fx_size)
1542         {
1543         case 2:
1544           intr->r_type = R_IMM16;
1545           break;
1546         case 1:
1547           intr->r_type = R_IMM8;
1548           break;
1549         case 4:
1550           intr->r_type = R_IMM32;
1551           break;
1552         default:
1553           abort ();
1554         }
1555     }
1556   else
1557     intr->r_type = fix_ptr->fx_r_type;
1558
1559   intr->r_vaddr = fix_ptr->fx_frag->fr_address + fix_ptr->fx_where + base;
1560   intr->r_offset = fix_ptr->fx_offset;
1561
1562   if (symbol_ptr)
1563     intr->r_symndx = symbol_ptr->sy_number;
1564   else
1565     intr->r_symndx = -1;
1566 }