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
   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   switch (opcode->noperands)
 735     {
 736     case 0:
 737       operand[0].mode = 0;
 738       operand[1].mode = 0;
 739       break;
 740
 741     case 1:
 742       ptr++;
 743       if (opcode->arg_info[0] == CLASS_CC)
 744         {
 745           get_cc_operand (&ptr, operand + 0, 0);
 746         }
 747       else if (opcode->arg_info[0] == CLASS_FLAGS)
 748         {
 749           get_flags_operand (&ptr, operand + 0, 0);
 750         }
 751       else if (opcode->arg_info[0] == (CLASS_IMM + (ARG_IMM2)))
 752         {
 753           get_interrupt_operand (&ptr, operand + 0, 0);
 754         }
 755       else
 756         {
 757           get_operand (&ptr, operand + 0, 0);
 758         }
 759       operand[1].mode = 0;
 760       break;
 761
 762     case 2:
 763       ptr++;
 764       savptr = ptr;
 765       if (opcode->arg_info[0] == CLASS_CC)
 766         {
 767           get_cc_operand (&ptr, operand + 0, 0);
 768         }
 769       else if (opcode->arg_info[0] == CLASS_CTRL)
 770         {
 771           get_ctrl_operand (&ptr, operand + 0, 0);
 772           if (the_ctrl == 0)
 773             {
 774               ptr = savptr;
 775               get_operand (&ptr, operand + 0, 0);
 776               if (ptr == 0)
 777                 return NULL;
 778               if (*ptr == ',')
 779                 ptr++;
 780               get_ctrl_operand (&ptr, operand + 1, 1);
 781               return ptr;
 782             }
 783         }
 784       else
 785         {
 786           get_operand (&ptr, operand + 0, 0);
 787         }
 788       if (ptr == 0)
 789         return NULL;
 790       if (*ptr == ',')
 791         ptr++;
 792       get_operand (&ptr, operand + 1, 1);
 793       break;
 794
 795     case 3:
 796       ptr++;
 797       get_operand (&ptr, operand + 0, 0);
 798       if (*ptr == ',')
 799         ptr++;
 800       get_operand (&ptr, operand + 1, 1);
 801       if (*ptr == ',')
 802         ptr++;
 803       get_operand (&ptr, operand + 2, 2);
 804       break;
 805
 806     case 4:
 807       ptr++;
 808       get_operand (&ptr, operand + 0, 0);
 809       if (*ptr == ',')
 810         ptr++;
 811       get_operand (&ptr, operand + 1, 1);
 812       if (*ptr == ',')
 813         ptr++;
 814       get_operand (&ptr, operand + 2, 2);
 815       if (*ptr == ',')
 816         ptr++;
 817       get_cc_operand (&ptr, operand + 3, 3);
 818       break;
 819
 820     default:
 821       abort ();
 822     }
 823
 824   return ptr;
 825 }
 826
 827 /* Passed a pointer to a list of opcodes which use different
 828    addressing modes.  Return the opcode which matches the opcodes
 829    provided.  */
 830
 831 static opcode_entry_type *
 832 get_specific (opcode, operands)
 833      opcode_entry_type *opcode;
 834      op_type *operands;
 835
 836 {
 837   opcode_entry_type *this_try = opcode;
 838   int found = 0;
 839   unsigned int noperands = opcode->noperands;
 840
 841   int this_index = opcode->idx;
 842
 843   while (this_index == opcode->idx && !found)
 844     {
 845       unsigned int i;
 846
 847       this_try = opcode++;
 848       for (i = 0; i < noperands; i++)
 849         {
 850           unsigned int mode = operands[i].mode;
 851
 852           if ((mode & CLASS_MASK) != (this_try->arg_info[i] & CLASS_MASK))
 853             {
 854               /* It could be an pc rel operand, if this is a da mode
 855                  and we like disps, then insert it.  */
 856
 857               if (mode == CLASS_DA && this_try->arg_info[i] == CLASS_DISP)
 858                 {
 859                   /* This is the case.  */
 860                   operands[i].mode = CLASS_DISP;
 861                 }
 862               else if (mode == CLASS_BA && this_try->arg_info[i])
 863                 {
 864                   /* Can't think of a way to turn what we've been
 865                      given into something that's OK.  */
 866                   goto fail;
 867                 }
 868               else if (this_try->arg_info[i] & CLASS_PR)
 869                 {
 870                   if (mode == CLASS_REG_LONG && segmented_mode)
 871                     {
 872                       /* OK.  */
 873                     }
 874                   else if (mode == CLASS_REG_WORD && !segmented_mode)
 875                     {
 876                       /* OK.  */
 877                     }
 878                   else
 879                     goto fail;
 880                 }
 881               else
 882                 goto fail;
 883             }
 884           switch (mode & CLASS_MASK)
 885             {
 886             default:
 887               break;
 888             case CLASS_X:
 889             case CLASS_IR:
 890             case CLASS_BA:
 891             case CLASS_BX:
 892             case CLASS_DISP:
 893             case CLASS_REG:
 894             case CLASS_REG_WORD:
 895             case CLASS_REG_BYTE:
 896             case CLASS_REG_QUAD:
 897             case CLASS_REG_LONG:
 898             case CLASS_REGN0:
 899               reg[this_try->arg_info[i] & ARG_MASK] = operands[i].reg;
 900               break;
 901             }
 902         }
 903
 904       found = 1;
 905     fail:
 906       ;
 907     }
 908   if (found)
 909     return this_try;
 910   else
 911     return 0;
 912 }
 913
 914 #if 0 /* Not used.  */
 915 static void
 916 check_operand (operand, width, string)
 917      struct z8k_op *operand;
 918      unsigned int width;
 919      char *string;
 920 {
 921   if (operand->exp.X_add_symbol == 0
 922       && operand->exp.X_op_symbol == 0)
 923     {
 924
 925       /* No symbol involved, let's look at offset, it's dangerous if
 926          any of the high bits are not 0 or ff's, find out by oring or
 927          anding with the width and seeing if the answer is 0 or all
 928          fs.  */
 929       if ((operand->exp.X_add_number & ~width) != 0 &&
 930           (operand->exp.X_add_number | width) != (~0))
 931         {
 932           as_warn (_("operand %s0x%x out of range."),
 933                    string, operand->exp.X_add_number);
 934         }
 935     }
 936
 937 }
 938 #endif
 939
 940 static char buffer[20];
 941
 942 static void
 943 newfix (ptr, type, operand)
 944      int ptr;
 945      int type;
 946      expressionS *operand;
 947 {
 948   if (operand->X_add_symbol
 949       || operand->X_op_symbol
 950       || operand->X_add_number)
 951     {
 952       fix_new_exp (frag_now,
 953                    ptr,
 954                    1,
 955                    operand,
 956                    0,
 957                    type);
 958     }
 959 }
 960
 961 static char *
 962 apply_fix (ptr, type, operand, size)
 963      char *ptr;
 964      int type;
 965      expressionS *operand;
 966      int size;
 967 {
 968   int n = operand->X_add_number;
 969
 970   newfix ((ptr - buffer) / 2, type, operand);
 971   switch (size)
 972     {
 973     case 8:                     /* 8 nibbles == 32 bits.  */
 974       *ptr++ = n >> 28;
 975       *ptr++ = n >> 24;
 976       *ptr++ = n >> 20;
 977       *ptr++ = n >> 16;
 978     case 4:                     /* 4 nibbles == 16 bits.  */
 979       *ptr++ = n >> 12;
 980       *ptr++ = n >> 8;
 981     case 2:
 982       *ptr++ = n >> 4;
 983     case 1:
 984       *ptr++ = n >> 0;
 985       break;
 986     }
 987   return ptr;
 988 }
 989
 990 /* Now we know what sort of opcodes it is.  Let's build the bytes.  */
 991
 992 #define INSERT(x,y) *x++ = y>>24; *x++ = y>> 16; *x++=y>>8; *x++ =y;
 993
 994 static void
 995 build_bytes (this_try, operand)
 996      opcode_entry_type *this_try;
 997      struct z8k_op *operand ATTRIBUTE_UNUSED;
 998 {
 999   char *output_ptr = buffer;
1000   int c;
1001   int nib;
1002   int nibble;
1003   unsigned int *class_ptr;
1004
1005   frag_wane (frag_now);
1006   frag_new (0);
1007
1008   memset (buffer, 20, 0);
1009   class_ptr = this_try->byte_info;
1010
1011   for (nibble = 0; (c = *class_ptr++); nibble++)
1012     {
1013
1014       switch (c & CLASS_MASK)
1015         {
1016         default:
1017           abort ();
1018
1019         case CLASS_ADDRESS:
1020           /* Direct address, we don't cope with the SS mode right now.  */
1021           if (segmented_mode)
1022             {
1023               /* da_operand->X_add_number |= 0x80000000;  --  Now set at relocation time.  */
1024               output_ptr = apply_fix (output_ptr, R_IMM32, da_operand, 8);
1025             }
1026           else
1027             {
1028               output_ptr = apply_fix (output_ptr, R_IMM16, da_operand, 4);
1029             }
1030           da_operand = 0;
1031           break;
1032         case CLASS_DISP8:
1033           /* pc rel 8 bit  */
1034           output_ptr = apply_fix (output_ptr, R_JR, da_operand, 2);
1035           da_operand = 0;
1036           break;
1037
1038         case CLASS_0DISP7:
1039           /* pc rel 7 bit  */
1040           *output_ptr = 0;
1041           output_ptr = apply_fix (output_ptr, R_DISP7, da_operand, 2);
1042           da_operand = 0;
1043           break;
1044
1045         case CLASS_1DISP7:
1046           /* pc rel 7 bit  */
1047           *output_ptr = 0x80;
1048           output_ptr = apply_fix (output_ptr, R_DISP7, da_operand, 2);
1049           output_ptr[-2] = 0x8;
1050           da_operand = 0;
1051           break;
1052
1053         case CLASS_BIT_1OR2:
1054           *output_ptr = c & 0xf;
1055           if (imm_operand)
1056             {
1057               if (imm_operand->X_add_number == 2)
1058                 *output_ptr |= 2;
1059               else if (imm_operand->X_add_number != 1)
1060                 as_bad (_("immediate must be 1 or 2"));
1061             }
1062           else
1063             as_bad (_("immediate 1 or 2 expected"));
1064           output_ptr++;
1065           break;
1066         case CLASS_CC:
1067           *output_ptr++ = the_cc;
1068           break;
1069         case CLASS_0CCC:
1070           *output_ptr++ = the_ctrl;
1071           break;
1072         case CLASS_1CCC:
1073           *output_ptr++ = the_ctrl | 0x8;
1074           break;
1075         case CLASS_00II:
1076           *output_ptr++ = (~the_interrupt & 0x3);
1077           break;
1078         case CLASS_01II:
1079           *output_ptr++ = (~the_interrupt & 0x3) | 0x4;
1080           break;
1081         case CLASS_FLAGS:
1082           *output_ptr++ = the_flags;
1083           break;
1084         case CLASS_BIT:
1085           *output_ptr++ = c & 0xf;
1086           break;
1087         case CLASS_REGN0:
1088           if (reg[c & 0xf] == 0)
1089             as_bad (_("can't use R0 here"));
1090           /* Fall through.  */
1091         case CLASS_REG:
1092         case CLASS_REG_BYTE:
1093         case CLASS_REG_WORD:
1094         case CLASS_REG_LONG:
1095         case CLASS_REG_QUAD:
1096           /* Insert bit mattern of right reg.  */
1097           *output_ptr++ = reg[c & 0xf];
1098           break;
1099         case CLASS_DISP:
1100           switch (c & ARG_MASK)
1101             {
1102             case ARG_DISP12:
1103               output_ptr = apply_fix (output_ptr, R_CALLR, da_operand, 4);
1104               break;
1105             case ARG_DISP16:
1106               output_ptr = apply_fix (output_ptr, R_REL16, da_operand, 4);
1107               break;
1108             default:
1109               output_ptr = apply_fix (output_ptr, R_IMM16, da_operand, 4);
1110             }
1111           da_operand = 0;
1112           break;
1113
1114         case CLASS_IMM:
1115           {
1116             nib = 0;
1117             switch (c & ARG_MASK)
1118               {
1119               case ARG_IMM4:
1120                 output_ptr = apply_fix (output_ptr, R_IMM4L, imm_operand, 1);
1121                 break;
1122               case ARG_IMM4M1:
1123                 imm_operand->X_add_number--;
1124                 output_ptr = apply_fix (output_ptr, R_IMM4L, imm_operand, 1);
1125                 break;
1126               case ARG_IMMNMINUS1:
1127                 imm_operand->X_add_number--;
1128                 output_ptr = apply_fix (output_ptr, R_IMM4L, imm_operand, 1);
1129                 break;
1130               case ARG_NIM8:
1131                 imm_operand->X_add_number = -imm_operand->X_add_number;
1132               case ARG_IMM8:
1133                 output_ptr = apply_fix (output_ptr, R_IMM8, imm_operand, 2);
1134                 break;
1135               case ARG_IMM16:
1136                 output_ptr = apply_fix (output_ptr, R_IMM16, imm_operand, 4);
1137                 break;
1138
1139               case ARG_IMM32:
1140                 output_ptr = apply_fix (output_ptr, R_IMM32, imm_operand, 8);
1141                 break;
1142
1143               default:
1144                 abort ();
1145               }
1146           }
1147         }
1148     }
1149
1150   /* Copy from the nibble buffer into the frag.  */
1151   {
1152     int length = (output_ptr - buffer) / 2;
1153     char *src = buffer;
1154     char *fragp = frag_more (length);
1155
1156     while (src < output_ptr)
1157       {
1158         *fragp = (src[0] << 4) | src[1];
1159         src += 2;
1160         fragp++;
1161       }
1162   }
1163 }
1164
1165 /* This is the guts of the machine-dependent assembler.  STR points to a
1166    machine dependent instruction.  This function is supposed to emit
1167    the frags/bytes it assembles to.  */
1168
1169 void
1170 md_assemble (str)
1171      char *str;
1172 {
1173   char c;
1174   char *op_start;
1175   char *op_end;
1176   struct z8k_op operand[3];
1177   opcode_entry_type *opcode;
1178   opcode_entry_type *prev_opcode;
1179
1180   /* Drop leading whitespace.  */
1181   while (*str == ' ')
1182     str++;
1183
1184   /* Find the op code end.  */
1185   for (op_start = op_end = str;
1186        *op_end != 0 && *op_end != ' ';
1187        op_end++)
1188     ;
1189
1190   if (op_end == op_start)
1191     {
1192       as_bad (_("can't find opcode "));
1193     }
1194   c = *op_end;
1195
1196   *op_end = 0;
1197
1198   opcode = (opcode_entry_type *) hash_find (opcode_hash_control, op_start);
1199
1200   if (opcode == NULL)
1201     {
1202       as_bad (_("unknown opcode"));
1203       return;
1204     }
1205
1206   if (opcode->opcode == 250)
1207     {
1208       /* Was really a pseudo op.  */
1209
1210       pseudo_typeS *p;
1211       char oc;
1212
1213       char *old = input_line_pointer;
1214       *op_end = c;
1215
1216       input_line_pointer = op_end;
1217
1218       oc = *old;
1219       *old = '\n';
1220       while (*input_line_pointer == ' ')
1221         input_line_pointer++;
1222       p = (pseudo_typeS *) (opcode->func);
1223
1224       (p->poc_handler) (p->poc_val);
1225       input_line_pointer = old;
1226       *old = oc;
1227     }
1228   else
1229     {
1230       input_line_pointer = get_operands (opcode, op_end, operand);
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   {NULL, no_argument, NULL, 0}
1340 };
1341
1342 size_t md_longopts_size = sizeof (md_longopts);
1343
1344 int
1345 md_parse_option (c, arg)
1346      int c;
1347      char *arg;
1348 {
1349   switch (c)
1350     {
1351     case 'z':
1352       if (!strcmp (arg, "8001"))
1353         s_segm ();
1354       else if (!strcmp (arg, "8002"))
1355         s_unseg ();
1356       else
1357         {
1358           as_bad (_("invalid architecture -z%s"), arg);
1359           return 0;
1360         }
1361       break;
1362
1363     default:
1364       return 0;
1365     }
1366
1367   return 1;
1368 }
1369
1370 void
1371 md_show_usage (stream)
1372      FILE *stream;
1373 {
1374   fprintf (stream, _("\
1375 Z8K options:\n\
1376 -z8001                  generate segmented code\n\
1377 -z8002                  generate unsegmented code\n"));
1378 }
1379 \f
1380 void
1381 tc_aout_fix_to_chars ()
1382 {
1383   printf (_("call to tc_aout_fix_to_chars \n"));
1384   abort ();
1385 }
1386
1387 void
1388 md_convert_frag (headers, seg, fragP)
1389      object_headers *headers ATTRIBUTE_UNUSED;
1390      segT seg ATTRIBUTE_UNUSED;
1391      fragS *fragP ATTRIBUTE_UNUSED;
1392 {
1393   printf (_("call to md_convert_frag \n"));
1394   abort ();
1395 }
1396
1397 valueT
1398 md_section_align (seg, size)
1399      segT seg;
1400      valueT size;
1401 {
1402   return ((size + (1 << section_alignment[(int) seg]) - 1)
1403           & (-1 << section_alignment[(int) seg]));
1404
1405 }
1406
1407 void
1408 md_apply_fix (fixP, val)
1409      fixS *fixP;
1410      long val;
1411 {
1412   char *buf = fixP->fx_where + fixP->fx_frag->fr_literal;
1413
1414   switch (fixP->fx_r_type)
1415     {
1416     case R_IMM4L:
1417       buf[0] = (buf[0] & 0xf0) | ((buf[0] + val) & 0xf);
1418       break;
1419
1420     case R_JR:
1421
1422       *buf++ = val;
1423 #if 0
1424       if (val != 0)
1425         abort ();
1426 #endif
1427       break;
1428
1429     case R_DISP7:
1430
1431       *buf++ += val;
1432 #if 0
1433       if (val != 0)
1434         abort ();
1435 #endif
1436       break;
1437
1438     case R_IMM8:
1439       buf[0] += val;
1440       break;
1441     case R_IMM16:
1442       *buf++ = (val >> 8);
1443       *buf++ = val;
1444       break;
1445     case R_IMM32:
1446       *buf++ = (val >> 24);
1447       *buf++ = (val >> 16);
1448       *buf++ = (val >> 8);
1449       *buf++ = val;
1450       break;
1451 #if 0
1452     case R_DA | R_SEG:
1453       *buf++ = (val >> 16);
1454       *buf++ = 0x00;
1455       *buf++ = (val >> 8);
1456       *buf++ = val;
1457       break;
1458 #endif
1459
1460     case 0:
1461       md_number_to_chars (buf, val, fixP->fx_size);
1462       break;
1463
1464     default:
1465       abort ();
1466     }
1467 }
1468
1469 int
1470 md_estimate_size_before_relax (fragP, segment_type)
1471      register fragS *fragP ATTRIBUTE_UNUSED;
1472      register segT segment_type ATTRIBUTE_UNUSED;
1473 {
1474   printf (_("call tomd_estimate_size_before_relax \n"));
1475   abort ();
1476 }
1477
1478 /* Put number into target byte order.  */
1479
1480 void
1481 md_number_to_chars (ptr, use, nbytes)
1482      char *ptr;
1483      valueT use;
1484      int nbytes;
1485 {
1486   number_to_chars_bigendian (ptr, use, nbytes);
1487 }
1488
1489 long
1490 md_pcrel_from (fixP)
1491      fixS *fixP ATTRIBUTE_UNUSED;
1492 {
1493   abort ();
1494 }
1495
1496 void
1497 tc_coff_symbol_emit_hook (s)
1498      symbolS *s ATTRIBUTE_UNUSED;
1499 {
1500 }
1501
1502 void
1503 tc_reloc_mangle (fix_ptr, intr, base)
1504      fixS *fix_ptr;
1505      struct internal_reloc *intr;
1506      bfd_vma base;
1507
1508 {
1509   symbolS *symbol_ptr;
1510
1511   if (fix_ptr->fx_addsy
1512       && fix_ptr->fx_subsy)
1513     {
1514       symbolS *add = fix_ptr->fx_addsy;
1515       symbolS *sub = fix_ptr->fx_subsy;
1516
1517       if (S_GET_SEGMENT (add) != S_GET_SEGMENT (sub))
1518         as_bad (_("Can't subtract symbols in different sections %s %s"),
1519                 S_GET_NAME (add), S_GET_NAME (sub));
1520       else
1521         {
1522           int diff = S_GET_VALUE (add) - S_GET_VALUE (sub);
1523
1524           fix_ptr->fx_addsy = 0;
1525           fix_ptr->fx_subsy = 0;
1526           fix_ptr->fx_offset += diff;
1527         }
1528     }
1529   symbol_ptr = fix_ptr->fx_addsy;
1530
1531   /* If this relocation is attached to a symbol then it's ok
1532      to output it.  */
1533   if (fix_ptr->fx_r_type == 0)
1534     {
1535       /* cons likes to create reloc32's whatever the size of the reloc.  */
1536       switch (fix_ptr->fx_size)
1537         {
1538         case 2:
1539           intr->r_type = R_IMM16;
1540           break;
1541         case 1:
1542           intr->r_type = R_IMM8;
1543           break;
1544         case 4:
1545           intr->r_type = R_IMM32;
1546           break;
1547         default:
1548           abort ();
1549         }
1550     }
1551   else
1552     intr->r_type = fix_ptr->fx_r_type;
1553
1554   intr->r_vaddr = fix_ptr->fx_frag->fr_address + fix_ptr->fx_where + base;
1555   intr->r_offset = fix_ptr->fx_offset;
1556
1557   if (symbol_ptr)
1558     intr->r_symndx = symbol_ptr->sy_number;
1559   else
1560     intr->r_symndx = -1;
1561 }