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   1 /* asmain.c */
   2
   3 /*
   4  * (C) Copyright 1989-1995
   5  * All Rights Reserved
   6  *
   7  * Alan R. Baldwin
   8  * 721 Berkeley St.
   9  * Kent, Ohio  44240
  10  */
  11
  12 /*
  13  * Extensions: P. Felber
  14  */
  15
  16 #include <stdio.h>
  17 #include <setjmp.h>
  18 #include <string.h>
  19 #include <alloc.h>
  20 #ifdef SDK
  21 #include <stdlib.h>
  22 #include <math.h>
  23 #undef HUGE
  24 #endif
  25 #include "asm.h"
  26
  27 /*)Module       asmain.c
  28  *
  29  *      The module asmain.c includes the command argument parser,
  30  *      the three pass sequencer, and the machine independent
  31  *      assembler parsing code.
  32  *
  33  *      asmain.c contains the following functions:
  34  *              VOID    main(argc, argv)
  35  *              VOID    asexit()
  36  *              VOID    asmbl()
  37  *              FILE *  afile(fn, ft, wf)
  38  *              VOID    newdot(nap)
  39  *              VOID    phase(ap, a)
  40  *              VOID    usage()
  41  *
  42  *      asmain.c contains the array char *usetxt[] which
  43  *      references the usage text strings printed by usage().
  44  */
  45
  46 /*)Function     VOID    main(argc, argv)
  47  *
  48  *              int     argc            argument count
  49  *              char *  argv            array of pointers to argument strings
  50  *
  51  *      The function main() is the entry point to the assembler.
  52  *      The purpose of main() is to (1) parse the command line
  53  *      arguments for options and source file specifications and
  54  *      (2) to process the source files through the 3 pass assembler.
  55  *      Before each assembler pass various variables are initialized
  56  *      and source files are rewound to their beginning.  During each
  57  *      assembler pass each assembler-source text line is processed.
  58  *      After each assembler pass the assembler information is flushed
  59  *      to any opened output files and the if-else-endif processing
  60  *      is checked for proper termination.
  61  *
  62  *      The function main() is also responsible for opening all
  63  *      output files (REL, LST, and SYM), sequencing the global (-g)
  64  *      and all-global (-a) variable definitions, and dumping the
  65  *      REL file header information.
  66  *
  67  *      local variables:
  68  *              char *  p               pointer to argument string
  69  *              int     c               character from argument string
  70  *              int     i               argument loop counter
  71  *              area *  ap              pointer to area structure
  72  *
  73  *      global variables:
  74  *              int     aflag           -a, make all symbols global flag
  75  *              char    afn[]           afile() constructed filespec
  76  *              area *  areap           pointer to an area structure
  77  *              int     cb[]            array of assembler output values
  78  *              int     cbt[]           array of assembler relocation types
  79  *                                      describing the data in cb[]
  80  *              int     cfile           current file handle index
  81  *                                      of input assembly files
  82  *              int *   cp              pointer to assembler output array cb[]
  83  *              int *   cpt             pointer to assembler relocation type
  84  *                                      output array cbt[]
  85  *              char    eb[]            array of generated error codes
  86  *              char *  ep              pointer into error list array eb[]
  87  *              int     fflag           -f(f), relocations flagged flag
  88  *              int     flevel          IF-ELSE-ENDIF flag will be non
  89  *                                      zero for false conditional case
  90  *              addr_t  fuzz            tracks pass to pass changes in the
  91  *                                      address of symbols caused by
  92  *                                      variable length instruction formats
  93  *              int     gflag           -g, make undefined symbols global flag
  94  *              char    ib[]            assembler-source text line
  95  *              int     inpfil          count of assembler
  96  *                                      input files specified
  97  *              int     ifcnd[]         array of IF statement condition
  98  *                                      values (0 = FALSE) indexed by tlevel
  99  *              int     iflvl[]         array of IF-ELSE-ENDIF flevel
 100  *                                      values indexed by tlevel
 101  *              int     incfil          current file handle index
 102  *                                      for include files
 103  *              char *  ip              pointer into the assembler-source
 104  *                                      text line in ib[]
 105  *              jmp_buf jump_env        compiler dependent structure
 106  *                                      used by setjmp() and longjmp()
 107  *              int     lflag           -l, generate listing flag
 108  *              int     line            current assembler source
 109  *                                      line number
 110  *              int     lop             current line number on page
 111  *              int     oflag           -o, generate relocatable output flag
 112  *              int     page            current page number
 113  *              int     pflag           enable listing pagination
 114  *              int     pass            assembler pass number
 115  *              int     radix           current number conversion radix:
 116  *                                      2 (binary), 8 (octal), 10 (decimal),
 117  *                                      16 (hexadecimal)
 118  *              int     sflag           -s, generate symbol table flag
 119  *              char    srcfn[][]       array of source file names
 120  *              int     srcline[]       current source file line
 121  *              char    stb[]           Subtitle string buffer
 122  *              sym *   symp            pointer to a symbol structure
 123  *              int     tlevel          current conditional level
 124  *              int     xflag           -x, listing radix flag
 125  *              FILE *  lfp             list output file handle
 126  *              FILE *  ofp             relocation output file handle
 127  *              FILE *  tfp             symbol table output file handle
 128  *              FILE *  sfp[]           array of assembler-source file handles
 129  *
 130  *      called functions:
 131  *              FILE *  afile()         asmain.c
 132  *              VOID    allglob()       assym.c
 133  *              VOID    asexit()        asmain.c
 134  *              VOID    diag()          assubr.c
 135  *              VOID    err()           assubr.c
 136  *              int     fprintf()       c-library
 137  *              int     getline()       aslex.c
 138  *              VOID    list()          aslist.c
 139  *              VOID    lstsym()        aslist.c
 140  *              VOID    minit()         ___mch.c
 141  *              VOID    newdot()        asmain.c
 142  *              VOID    outchk()        asout.c
 143  *              VOID    outgsd()        asout.c
 144  *              int     rewind()        c-library
 145  *              int     setjmp()        c-library
 146  *              VOID    symglob()       assym.c
 147  *              VOID    syminit()       assym.c
 148  *              VOID    usage()         asmain.c
 149  *
 150  *      side effects:
 151  *              Completion of main() completes the assembly process.
 152  *              REL, LST, and/or SYM files may be generated.
 153  */
 154
 155 int
 156 main(int argc, char **argv)
 157 {
 158         register char *p;
 159         register int c, i;
 160         struct area *ap;
 161
 162 #ifdef SDK
 163         inpfil = -2;
 164 #else /* SDK */
 165         fprintf(stdout, "\n");
 166         inpfil = -1;
 167 #endif /* SDK */
 168         pflag = 1;
 169         for (i=1; i<argc; ++i) {
 170                 p = argv[i];
 171                 if (*p == '-') {
 172                         if (inpfil >= 0)
 173                                 usage();
 174                         ++p;
 175                         while ((c = *p++) != 0)
 176                                 switch(c) {
 177
 178                                 case 'a':
 179                                 case 'A':
 180                                         ++aflag;
 181                                         break;
 182
 183                                 case 'g':
 184                                 case 'G':
 185                                         ++gflag;
 186                                         break;
 187
 188                                 case 'l':
 189                                 case 'L':
 190                                         ++lflag;
 191                                         break;
 192
 193                                 case 'o':
 194                                 case 'O':
 195                                         ++oflag;
 196                                         break;
 197
 198                                 case 's':
 199                                 case 'S':
 200                                         ++sflag;
 201                                         break;
 202
 203                                 case 'p':
 204                                 case 'P':
 205                                         pflag = 0;
 206                                         break;
 207
 208                                 case 'x':
 209                                 case 'X':
 210                                         xflag = 0;
 211                                         break;
 212
 213                                 case 'q':
 214                                 case 'Q':
 215                                         xflag = 1;
 216                                         break;
 217
 218                                 case 'd':
 219                                 case 'D':
 220                                         xflag = 2;
 221                                         break;
 222
 223                                 case 'f':
 224                                 case 'F':
 225                                         ++fflag;
 226                                         break;
 227
 228                                 default:
 229                                         usage();
 230                                 }
 231                 } else {
 232 #ifdef SDK
 233                         if(inpfil != -2) {
 234 #endif /* SDK */
 235                         if (++inpfil == MAXFIL) {
 236                                 fprintf(stderr, "too many input files\n");
 237                                 asexit(1);
 238                         }
 239                         sfp[inpfil] = afile(p, "", 0);
 240                         strcpy(srcfn[inpfil],afn);
 241 #ifdef SDK
 242                         } else
 243                                 inpfil++;
 244                         if (inpfil == -1) {
 245                                 if (lflag)
 246                                         lfp = afile(p, "lst", 1);
 247                                 if (oflag)
 248                                         ofp = afile(p, "", 1);
 249                                 if (sflag)
 250                                         tfp = afile(p, "sym", 1);
 251                         }
 252 #else /* SDK */
 253                         if (inpfil == 0) {
 254                                 if (lflag)
 255                                         lfp = afile(p, "LST", 1);
 256                                 if (oflag)
 257                                         ofp = afile(p, "REL", 1);
 258                                 if (sflag)
 259                                         tfp = afile(p, "SYM", 1);
 260                         }
 261 #endif /* SDK */
 262                 }
 263         }
 264         if (inpfil < 0)
 265                 usage();
 266         syminit();
 267         for (pass=0; pass<3; ++pass) {
 268                 if (gflag && pass == 1)
 269                         symglob();
 270                 if (aflag && pass == 1)
 271                         allglob();
 272                 if (oflag && pass == 2)
 273                         outgsd();
 274                 flevel = 0;
 275                 tlevel = 0;
 276                 ifcnd[0] = 0;
 277                 iflvl[0] = 0;
 278                 radix = 10;
 279                 srcline[0] = 0;
 280                 page = 0;
 281                 stb[0] = 0;
 282                 lop  = NLPP;
 283                 cfile = 0;
 284                 incfil = -1;
 285                 for (i = 0; i <= inpfil; i++)
 286                         rewind(sfp[i]);
 287                 ap = areap;
 288                 while (ap) {
 289                         ap->a_fuzz = 0;
 290                         ap->a_size = 0;
 291                         ap = ap->a_ap;
 292                 }
 293                 fuzz = 0;
 294                 dot.s_addr = 0;
 295                 dot.s_area = &dca;
 296                 symp = &dot;
 297                 minit();
 298                 while (getline()) {
 299                         cp = cb;
 300                         cpt = cbt;
 301                         ep = eb;
 302                         ip = ib;
 303                         if (setjmp(jump_env) == 0)
 304                                 asmbl();
 305                         if (pass == 2) {
 306                                 diag();
 307                                 list();
 308                         }
 309                 }
 310                 newdot(dot.s_area); /* Flush area info */
 311                 if (flevel || tlevel)
 312                         err('i');
 313         }
 314         if (oflag)
 315                 outchk(HUGE, HUGE);  /* Flush */
 316         if (sflag) {
 317                 lstsym(tfp);
 318         } else
 319         if (lflag) {
 320                 lstsym(lfp);
 321         }
 322         asexit(aserr);
 323         /* Never reached */
 324         return 0;
 325 }
 326
 327 /*)Function     VOID    asexit(i)
 328  *
 329  *                      int     i       exit code
 330  *
 331  *      The function asexit() explicitly closes all open
 332  *      files and then terminates the program.
 333  *
 334  *      local variables:
 335  *              int     j               loop counter
 336  *
 337  *      global variables:
 338  *              FILE *  ifp[]           array of include-file file handles
 339  *              FILE *  lfp             list output file handle
 340  *              FILE *  ofp             relocation output file handle
 341  *              FILE *  tfp             symbol table output file handle
 342  *              FILE *  sfp[]           array of assembler-source file handles
 343  *
 344  *      functions called:
 345  *              int     fclose()        c-library
 346  *              VOID    exit()          c-library
 347  *
 348  *      side effects:
 349  *              All files closed. Program terminates.
 350  */
 351
 352 VOID
 353 asexit(i)
 354 int i;
 355 {
 356         int j;
 357
 358         if (lfp != NULL) fclose(lfp);
 359         if (ofp != NULL) fclose(ofp);
 360         if (tfp != NULL) fclose(tfp);
 361
 362         for (j=0; j<MAXFIL && sfp[j] != NULL; j++) {
 363                 fclose(sfp[j]);
 364         }
 365
 366         for (j=0; j<MAXINC && ifp[j] != NULL; j++) {
 367                 fclose(ifp[j]);
 368         }
 369
 370         exit(i);
 371 }
 372
 373 /*)Function     VOID    asmbl()
 374  *
 375  *      The function asmbl() scans the assembler-source text for
 376  *      (1) labels, global labels, equates, global equates, and local
 377  *      symbols, (2) .if, .else, .endif, and .page directives,
 378  *      (3) machine independent assembler directives, and (4) machine
 379  *      dependent mnemonics.
 380  *
 381  *      local variables:
 382  *              mne *   mp              pointer to a mne structure
 383  *              sym *   sp              pointer to a sym structure
 384  *              tsym *  tp              pointer to a tsym structure
 385  *              int     c               character from assembler-source
 386  *                                      text line
 387  *              area *  ap              pointer to an area structure
 388  *              expr    e1              expression structure
 389  *              char    id[]            id string
 390  *              char    opt[]           options string
 391  *              char    fn[]            filename string
 392  *              char *  p               pointer into a string
 393  *              int     d               temporary value
 394  *              int     n               temporary value
 395  *              int     uaf             user area options flag
 396  *              int     uf              area options
 397  *
 398  *      global variables:
 399  *              area *  areap           pointer to an area structure
 400  *              char    ctype[]         array of character types, one per
 401  *                                      ASCII character
 402  *              int     flevel          IF-ELSE-ENDIF flag will be non
 403  *                                      zero for false conditional case
 404  *              addr_t  fuzz            tracks pass to pass changes in the
 405  *                                      address of symbols caused by
 406  *                                      variable length instruction formats
 407  *              int     ifcnd[]         array of IF statement condition
 408  *                                      values (0 = FALSE) indexed by tlevel
 409  *              int     iflvl[]         array of IF-ELSE-ENDIF flevel
 410  *                                      values indexed by tlevel
 411  *              FILE *  ifp[]           array of include-file file handles
 412  *              char    incfn[][]       array of include file names
 413  *              int     incline[]       current include file line
 414  *              int     incfil          current file handle index
 415  *                                      for include files
 416  *              addr_t  laddr           address of current assembler line
 417  *                                      or value of .if argument
 418  *              int     lmode           listing mode
 419  *              int     lop             current line number on page
 420  *              char    module[]        module name string
 421  *              int     pass            assembler pass number
 422  *              int     radix           current number conversion radix:
 423  *                                      2 (binary), 8 (octal), 10 (decimal),
 424  *                                      16 (hexadecimal)
 425  *              char    stb[]           Subtitle string buffer
 426  *              sym *   symp            pointer to a symbol structure
 427  *              char    tb[]            Title string buffer
 428  *              int     tlevel          current conditional level
 429  *
 430  *      functions called:
 431  *              addr_t  absexpr()       asexpr.c
 432  *              area *  alookup()       assym.c
 433  *              VOID    clrexpr()       asexpr.c
 434  *              int     digit()         asexpr.c
 435  *              char    endline()       aslex.c
 436  *              VOID    err()           assubr.c
 437  *              VOID    expr()          asexpr.c
 438  *              FILE *  fopen()         c-library
 439  *              char    get()           aslex.c
 440  *              VOID    getid()         aslex.c
 441  *              int     getmap()        aslex.c
 442  *              char    getnb()         aslex.c
 443  *              VOID    getst()         aslex.c
 444  *              sym *   lookup()        assym.c
 445  *              VOID    machin()        ___mch.c
 446  *              mne *   mlookup()       assym.c
 447  *              int     more()          aslex.c
 448  *              VOID *  new()           assym.c
 449  *              VOID    newdot()        asmain.c
 450  *              VOID    outall()        asout.c
 451  *              VOID    outab()         asout.c
 452  *              VOID    outchk()        asout.c
 453  *              VOID    outrb()         asout.c
 454  *              VOID    outrw()         asout.c
 455  *              VOID    phase()         asmain.c
 456  *              VOID    qerr()          assubr.c
 457  *              char *  strcpy()        c-library
 458  *              char *  strncpy()       c-library
 459  *              VOID    unget()         aslex.c
 460  */
 461
 462 VOID
 463 asmbl()
 464 {
 465         register struct mne *mp;
 466         register struct sym *sp;
 467         register struct tsym *tp;
 468         register int c;
 469         struct area  *ap;
 470         struct expr e1;
 471         char id[NCPS];
 472         char opt[NCPS];
 473         char fn[FILSPC];
 474         char *p;
 475         int d, n, uaf, uf;
 476
 477 #ifdef SDK
 478         double f1, f2;
 479         unsigned int mantissa, exponent;
 480         const signed char readbuffer[80];
 481 #endif
 482         laddr = dot.s_addr;
 483         lmode = SLIST;
 484 loop:
 485         if ((c=endline()) == 0) { return; }
 486         /*
 487          * If the first character is a digit then assume
 488          * a local symbol is being specified.  The symbol
 489          * must end with $: to be valid.
 490          *      pass 0:
 491          *              Construct a tsym structure at the first
 492          *              occurance of the symbol.  Flag the symbol
 493          *              as multiply defined if not the first occurance.
 494          *      pass 1:
 495          *              Load area, address, and fuzz values
 496          *              into structure tsym.
 497          *      pass 2:
 498          *              Check for assembler phase error and
 499          *              multiply defined error.
 500          */
 501         if (ctype[c] & DIGIT) {
 502                 if (flevel)
 503                         return;
 504                 n = 0;
 505                 while ((d = digit(c, 10)) >= 0) {
 506                         n = 10*n + d;
 507                         c = get();
 508                 }
 509                 if (c != '$' || get() != ':')
 510                         qerr();
 511                 tp = symp->s_tsym;
 512                 if (pass == 0) {
 513                         while (tp) {
 514                                 if (n == tp->t_num) {
 515                                         tp->t_flg |= S_MDF;
 516                                         break;
 517                                 }
 518                                 tp = tp->t_lnk;
 519                         }
 520                         if (tp == NULL) {
 521                                 tp=(struct tsym *) new (sizeof(struct tsym));
 522                                 tp->t_lnk = symp->s_tsym;
 523                                 tp->t_num = n;
 524                                 tp->t_flg = 0;
 525                                 tp->t_area = dot.s_area;
 526                                 tp->t_addr = dot.s_addr;
 527                                 symp->s_tsym = tp;
 528                         }
 529                 } else {
 530                         while (tp) {
 531                                 if (n == tp->t_num) {
 532                                         break;
 533                                 }
 534                                 tp = tp->t_lnk;
 535                         }
 536                         if (tp) {
 537                                 if (pass == 1) {
 538                                         fuzz = tp->t_addr - dot.s_addr;
 539                                         tp->t_area = dot.s_area;
 540                                         tp->t_addr = dot.s_addr;
 541                                 } else {
 542                                         phase(tp->t_area, tp->t_addr);
 543                                         if (tp->t_flg & S_MDF)
 544                                                 err('m');
 545                                 }
 546                         } else {
 547                                 err('u');
 548                         }
 549                 }
 550                 lmode = ALIST;
 551                 goto loop;
 552         }
 553         /*
 554          * If the first character is a letter then assume a lable,
 555          * symbol, assembler directive, or assembler mnemonic is
 556          * being processed.
 557          */
 558         if ((ctype[c] & LETTER) == 0)
 559                 if (flevel) {
 560                         return;
 561                 } else {
 562                         qerr();
 563                 }
 564         getid(id, c);
 565         c = getnb();
 566         /*
 567          * If the next character is a : then a label is being processed.
 568          * A double :: defines a global label.  If this is new label
 569          * then create a symbol structure.
 570          *      pass 0:
 571          *              Flag multiply defined labels.
 572          *      pass 1:
 573          *              Load area, address, and fuzz values
 574          *              into structure symp.
 575          *      pass 2:
 576          *              Check for assembler phase error and
 577          *              multiply defined error.
 578          */
 579         if (c == ':') {
 580                 if (flevel)
 581                         return;
 582                 if ((c = get()) != ':') {
 583                         unget(c);
 584                         c = 0;
 585                 }
 586                 symp = lookup(id);
 587                 if (symp == &dot)
 588                         err('.');
 589                 if (pass == 0)
 590                         if ((symp->s_type != S_NEW) &&
 591                            ((symp->s_flag & S_ASG) == 0))
 592                                 symp->s_flag |= S_MDF;
 593                 if (pass != 2) {
 594                         fuzz = symp->s_addr - dot.s_addr;
 595                         symp->s_type = S_USER;
 596                         symp->s_area = dot.s_area;
 597                         symp->s_addr = dot.s_addr;
 598                 } else {
 599                         if (symp->s_flag & S_MDF)
 600                                 err('m');
 601                         phase(symp->s_area, symp->s_addr);
 602                 }
 603                 if (c) {
 604                         symp->s_flag |= S_GBL;
 605                 }
 606                 lmode = ALIST;
 607                 goto loop;
 608         }
 609         /*
 610          * If the next character is a = then an equate is being processed.
 611          * A double == defines a global equate.  If this is new variable
 612          * then create a symbol structure.
 613          */
 614         if (c == '=') {
 615                 if (flevel)
 616                         return;
 617                 if ((c = get()) != '=') {
 618                         unget(c);
 619                         c = 0;
 620                 }
 621                 clrexpr(&e1);
 622                 expr(&e1, 0);
 623                 sp = lookup(id);
 624                 if (sp == &dot) {
 625                         outall();
 626                         if (e1.e_flag || e1.e_base.e_ap != dot.s_area)
 627                                 err('.');
 628                 } else
 629                 if (sp->s_type != S_NEW && (sp->s_flag & S_ASG) == 0) {
 630                         err('m');
 631                 }
 632                 sp->s_type = S_USER;
 633                 sp->s_area = e1.e_base.e_ap;
 634                 sp->s_addr = laddr = e1.e_addr;
 635                 sp->s_flag |= S_ASG;
 636                 if (c) {
 637                         sp->s_flag |= S_GBL;
 638                 }
 639                 lmode = ELIST;
 640                 goto loop;
 641         }
 642         unget(c);
 643         lmode = flevel ? SLIST : CLIST;
 644         if ((mp = mlookup(id)) == NULL) {
 645                 if (!flevel)
 646                         err('o');
 647                 return;
 648         }
 649         /*
 650          * If we have gotten this far then we have found an
 651          * assembler directive or an assembler mnemonic.
 652          *
 653          * Check for .if, .else, .endif, and .page directives
 654          * which are not controlled by the conditional flags
 655          */
 656         switch (mp->m_type) {
 657
 658         case S_IF:
 659                 n = absexpr();
 660                 if (tlevel < MAXIF) {
 661                         ++tlevel;
 662                         ifcnd[tlevel] = n;
 663                         iflvl[tlevel] = flevel;
 664                         if (n == 0) {
 665                                 ++flevel;
 666                         }
 667                 } else {
 668                         err('i');
 669                 }
 670                 lmode = ELIST;
 671                 laddr = n;
 672                 return;
 673
 674         case S_ELSE:
 675                 if (ifcnd[tlevel]) {
 676                         if (++flevel > (iflvl[tlevel]+1)) {
 677                                 err('i');
 678                         }
 679                 } else {
 680                         if (--flevel < iflvl[tlevel]) {
 681                                 err('i');
 682                         }
 683                 }
 684                 lmode = SLIST;
 685                 return;
 686
 687         case S_ENDIF:
 688                 if (tlevel) {
 689                         flevel = iflvl[tlevel--];
 690                 } else {
 691                         err('i');
 692                 }
 693                 lmode = SLIST;
 694                 return;
 695
 696         case S_PAGE:
 697                 lop = NLPP;
 698                 lmode = NLIST;
 699                 return;
 700
 701         default:
 702                 break;
 703         }
 704         if (flevel)
 705                 return;
 706         /*
 707          * If we are not in a false state for .if/.else then
 708          * process the assembler directives here.
 709          */
 710         switch (mp->m_type) {
 711
 712         case S_EVEN:
 713                 outall();
 714                 laddr = dot.s_addr = (dot.s_addr + 1) & ~1;
 715                 lmode = ALIST;
 716                 break;
 717
 718         case S_ODD:
 719                 outall();
 720                 laddr = dot.s_addr |= 1;
 721                 lmode = ALIST;
 722                 break;
 723
 724         case S_BYTE:
 725         case S_WORD:
 726                 do {
 727                         clrexpr(&e1);
 728                         expr(&e1, 0);
 729                         if (mp->m_type == S_BYTE) {
 730                                 outrb(&e1, R_NORM);
 731                         } else {
 732                                 outrw(&e1, R_NORM);
 733                         }
 734                 } while ((c = getnb()) == ',');
 735                 unget(c);
 736                 break;
 737
 738 #ifdef SDK
 739         case S_FLOAT:
 740                 do {
 741                         getid( readbuffer, ' ' ); /* Hack :) */
 742                         if ((c=getnb())=='.')
 743                           {
 744                                   getid(&readbuffer[strlen(readbuffer)],'.');
 745                           }
 746                         else
 747                             unget(c);
 748
 749                         f1 = strtod( readbuffer, (char **)NULL );
 750                         /* Convert f1 to a gb-lib type fp
 751                          * 24 bit mantissa followed by 7 bit exp and 1 bit sign
 752                         */
 753
 754                         if (f1!=0)
 755                           {
 756
 757                                   f2 = floor(log(fabs(f1))/log(2))+1;
 758                                   mantissa = (0x1000000*fabs(f1))/exp(f2*log(2));
 759                                   mantissa &=0xffffff;
 760                                   exponent = f2 + 0x40;
 761                                   if (f1<0)
 762                                       exponent |=0x80;
 763                           }
 764
 765                         else
 766                           {
 767                                   mantissa=0;
 768                                   exponent=0;
 769                           }
 770
 771                         outab(mantissa&0xff);
 772                         outab((mantissa>>8)&0xff);
 773                         outab((mantissa>>16)&0xff);
 774                         outab(exponent&0xff);
 775
 776                 } while ((c = getnb()) == ',');
 777                 unget(c);
 778                 break;
 779 #endif
 780
 781         case S_ASCII:
 782         case S_ASCIZ:
 783                 if ((d = getnb()) == '\0')
 784                         qerr();
 785                 while ((c = getmap(d)) >= 0)
 786                         outab(c);
 787                 if (mp->m_type == S_ASCIZ)
 788                         outab(0);
 789                 break;
 790
 791         case S_ASCIS:
 792                 if ((d = getnb()) == '\0')
 793                         qerr();
 794                 c = getmap(d);
 795                 while (c >= 0) {
 796                         if ((n = getmap(d)) >= 0) {
 797                                 outab(c);
 798                         } else {
 799                                 outab(c | 0x80);
 800                         }
 801                         c = n;
 802                 }
 803                 break;
 804
 805         case S_BLK:
 806                 clrexpr(&e1);
 807                 expr(&e1, 0);
 808                 dot.s_addr += e1.e_addr*mp->m_valu;
 809                 outchk(HUGE,HUGE);
 810                 lmode = BLIST;
 811                 break;
 812
 813         case S_TITLE:
 814                 p = tb;
 815                 if ((c = getnb()) != 0) {
 816                         do {
 817                                 if (p < &tb[NTITL-1])
 818                                         *p++ = c;
 819                         } while ((c = get()) != 0);
 820                 }
 821                 *p = 0;
 822                 unget(c);
 823                 lmode = SLIST;
 824                 break;
 825
 826         case S_SBTL:
 827                 p = stb;
 828                 if ((c = getnb()) != 0) {
 829                         do {
 830                                 if (p < &stb[NSBTL-1])
 831                                         *p++ = c;
 832                         } while ((c = get()) != 0);
 833                 }
 834                 *p = 0;
 835                 unget(c);
 836                 lmode = SLIST;
 837                 break;
 838
 839         case S_MODUL:
 840                 getst(id, -1);
 841                 if (pass == 0) {
 842                         if (module[0]) {
 843                                 err('m');
 844                         } else {
 845                                 strncpy(module, id, NCPS);
 846                         }
 847                 }
 848                 lmode = SLIST;
 849                 break;
 850
 851         case S_GLOBL:
 852                 do {
 853                         getid(id, -1);
 854                         sp = lookup(id);
 855                         sp->s_flag |= S_GBL;
 856                 } while ((c = getnb()) == ',');
 857                 unget(c);
 858                 lmode = SLIST;
 859                 break;
 860
 861         case S_DAREA:
 862                 getid(id, -1);
 863                 uaf = 0;
 864                 uf  = A_CON|A_REL;
 865                 if ((c = getnb()) == '(') {
 866                         do {
 867                                 getid(opt, -1);
 868                                 mp = mlookup(opt);
 869                                 if (mp && mp->m_type == S_ATYP) {
 870                                         ++uaf;
 871                                         uf |= mp->m_valu;
 872                                 } else {
 873                                         err('u');
 874                                 }
 875                         } while ((c = getnb()) == ',');
 876                         if (c != ')')
 877                                 qerr();
 878                 } else {
 879                         unget(c);
 880                 }
 881                 if ((ap = alookup(id)) != NULL) {
 882                         if (uaf && uf != ap->a_flag)
 883                                 err('m');
 884                 } else {
 885                         ap = (struct area *) new (sizeof(struct area));
 886                         ap->a_ap = areap;
 887                         strncpy(ap->a_id, id, NCPS);
 888                         ap->a_ref = areap->a_ref + 1;
 889                         ap->a_size = 0;
 890                         ap->a_fuzz = 0;
 891                         ap->a_flag = uaf ? uf : (A_CON|A_REL);
 892                         areap = ap;
 893                 }
 894                 newdot(ap);
 895                 lmode = SLIST;
 896                 break;
 897
 898         case S_ORG:
 899                 if (dot.s_area->a_flag & A_ABS) {
 900                         outall();
 901                         laddr = dot.s_addr = absexpr();
 902                 } else {
 903                         err('o');
 904                 }
 905                 outall();
 906                 lmode = ALIST;
 907                 break;
 908
 909         case S_RADIX:
 910                 if (more()) {
 911                         switch (getnb()) {
 912                         case 'b':
 913                         case 'B':
 914                                 radix = 2;
 915                                 break;
 916                         case '@':
 917                         case 'o':
 918                         case 'O':
 919                         case 'q':
 920                         case 'Q':
 921                                 radix = 8;
 922                                 break;
 923                         case 'd':
 924                         case 'D':
 925                                 radix = 10;
 926                                 break;
 927                         case 'h':
 928                         case 'H':
 929                         case 'x':
 930                         case 'X':
 931                                 radix = 16;
 932                                 break;
 933                         default:
 934                                 radix = 10;
 935                                 qerr();
 936                                 break;
 937                         }
 938                 } else {
 939                         radix = 10;
 940                 }
 941                 lmode = SLIST;
 942                 break;
 943
 944         case S_INCL:
 945                 d = getnb();
 946                 p = fn;
 947                 while ((c = get()) != d) {
 948                         if (p < &fn[FILSPC-1]) {
 949                                 *p++ = c;
 950                         } else {
 951                                 break;
 952                         }
 953                 }
 954                 *p = 0;
 955                 if (++incfil == MAXINC ||
 956                    (ifp[incfil] = fopen(fn, "r")) == NULL) {
 957                         --incfil;
 958                         err('i');
 959                 } else {
 960                         lop = NLPP;
 961                         incline[incfil] = 0;
 962                         strcpy(incfn[incfil],fn);
 963                 }
 964                 lmode = SLIST;
 965                 break;
 966
 967         /*
 968          * If not an assembler directive then go to
 969          * the machine dependent function which handles
 970          * all the assembler mnemonics.
 971          */
 972         default:
 973                 machine(mp);
 974         }
 975         goto loop;
 976 }
 977
 978 /*)Function     FILE *  afile(fn, ft, wf)
 979  *
 980  *              char *  fn              file specification string
 981  *              char *  ft              file type string
 982  *              int     wf              read(0)/write(1) flag
 983  *
 984  *      The function afile() opens a file for reading or writing.
 985  *              (1)     If the file type specification string ft
 986  *                      is not NULL then a file specification is
 987  *                      constructed with the file path\name in fn
 988  *                      and the extension in ft.
 989  *              (2)     If the file type specification string ft
 990  *                      is NULL then the file specification is
 991  *                      constructed from fn.  If fn does not have
 992  *                      a file type then the default source file
 993  *                      type dsft is appended to the file specification.
 994  *
 995  *      afile() returns a file handle for the opened file or aborts
 996  *      the assembler on an open error.
 997  *
 998  *      local variables:
 999  *              int     c               character value
1000  *              FILE *  fp              filehandle for opened file
1001  *              char *  p1              pointer to filespec string fn
1002  *              char *  p2              pointer to filespec string fb
1003  *              char *  p3              pointer to filetype string ft
1004  *
1005  *      global variables:
1006  *              char    afn[]           afile() constructed filespec
1007  *              char    dsft[]          default assembler file type string
1008  *              char    afn[]           constructed file specification string
1009  *
1010  *      functions called:
1011  *              VOID    asexit()        asmain.c
1012  *              FILE *  fopen()         c_library
1013  *              int     fprintf()       c_library
1014  *
1015  *      side effects:
1016  *              File is opened for read or write.
1017  */
1018
1019 FILE *
1020 afile(fn, ft, wf)
1021 char *fn;
1022 char *ft;
1023 int wf;
1024 {
1025         register char *p1, *p2, *p3;
1026         register int c;
1027         FILE *fp;
1028
1029         p1 = fn;
1030         p2 = afn;
1031         p3 = ft;
1032         while ((c = *p1++) != 0 && c != FSEPX) {
1033                 if (p2 < &afn[FILSPC-4])
1034                         *p2++ = c;
1035         }
1036         *p2++ = FSEPX;
1037         if (*p3 == 0) {
1038                 if (c == FSEPX) {
1039                         p3 = p1;
1040                 } else {
1041                         p3 = dsft;
1042                 }
1043         }
1044         while ((c = *p3++) != 0) {
1045                 if (p2 < &afn[FILSPC-1])
1046                         *p2++ = c;
1047         }
1048         *p2++ = 0;
1049         if ((fp = fopen(afn, wf?"w":"r")) == NULL) {
1050                 fprintf(stderr, "%s: cannot %s.\n", afn, wf?"create":"open");
1051                 asexit(1);
1052         }
1053         return (fp);
1054 }
1055
1056 /*)Function     VOID    newdot(nap)
1057  *
1058  *              area *  nap             pointer to the new area structure
1059  *
1060  *      The function newdot():
1061  *              (1)     copies the current values of fuzz and the last
1062  *                      address into the current area referenced by dot
1063  *              (2)     loads dot with the pointer to the new area and
1064  *                      loads the fuzz and last address parameters
1065  *              (3)     outall() is called to flush any remaining
1066  *                      bufferred code from the old area to the output
1067  *
1068  *      local variables:
1069  *              area *  oap             pointer to old area
1070  *
1071  *      global variables:
1072  *              sym     dot             defined as sym[0]
1073  *              addr_t  fuzz            tracks pass to pass changes in the
1074  *                                      address of symbols caused by
1075  *                                      variable length instruction formats
1076  *
1077  *      functions called:
1078  *              none
1079  *
1080  *      side effects:
1081  *              Current area saved, new area loaded, buffers flushed.
1082  */
1083
1084 VOID
1085 newdot(nap)
1086 register struct area *nap;
1087 {
1088         register struct area *oap;
1089
1090         oap = dot.s_area;
1091         oap->a_fuzz = fuzz;
1092         oap->a_size = dot.s_addr;
1093         fuzz = nap->a_fuzz;
1094         dot.s_area = nap;
1095         dot.s_addr = nap->a_size;
1096         outall();
1097 }
1098
1099 /*)Function     VOID    phase(ap, a)
1100  *
1101  *              area *  ap              pointer to area
1102  *              addr_t  a               address in area
1103  *
1104  *      Function phase() compares the area ap and address a
1105  *      with the current area dot.s_area and address dot.s_addr
1106  *      to determine if the position of the symbol has changed
1107  *      between assembler passes.
1108  *
1109  *      local variables:
1110  *              none
1111  *
1112  *      global varaibles:
1113  *              sym *   dot             defined as sym[0]
1114  *
1115  *      functions called:
1116  *              none
1117  *
1118  *      side effects:
1119  *              The p error is invoked if the area and/or address
1120  *              has changed.
1121  */
1122
1123 VOID
1124 phase(ap, a)
1125 struct area *ap;
1126 addr_t a;
1127 {
1128         if (ap != dot.s_area || a != dot.s_addr)
1129                 err('p');
1130 }
1131
1132 char *usetxt[] = {
1133 #ifdef SDK
1134         "Usage: [-dqxgalopsf] outfile file1 [file2 file3 ...]",
1135 #else /* SDK */
1136         "Usage: [-dqxgalopsf] file1 [file2 file3 ...]",
1137 #endif /* SDK */
1138         "  d    decimal listing",
1139         "  q    octal   listing",
1140         "  x    hex     listing (default)",
1141         "  g    undefined symbols made global",
1142         "  a    all user symbols made global",
1143 #ifdef SDK
1144         "  l    create list   output outfile[LST]",
1145         "  o    create object output outfile[o]",
1146         "  s    create symbol output outfile[SYM]",
1147 #else /* SDK */
1148         "  l    create list   output file1[LST]",
1149         "  o    create object output file1[REL]",
1150         "  s    create symbol output file1[SYM]",
1151 #endif /* SDK */
1152         "  p    disable listing pagination",
1153         "  f    flag relocatable references by  `   in listing file",
1154         " ff    flag relocatable references by mode in listing file",
1155         "",
1156         0
1157 };
1158
1159 /*)Function     VOID    usage()
1160  *
1161  *      The function usage() outputs to the stderr device the
1162  *      assembler name and version and a list of valid assembler options.
1163  *
1164  *      local variables:
1165  *              char ** dp              pointer to an array of
1166  *                                      text string pointers.
1167  *
1168  *      global variables:
1169  *              char    cpu[]           assembler type string
1170  *              char *  usetxt[]        array of string pointers
1171  *
1172  *      functions called:
1173  *              VOID    asexit()        asmain.c
1174  *              int     fprintf()       c_library
1175  *
1176  *      side effects:
1177  *              program is terminated
1178  */
1179
1180 VOID
1181 usage()
1182 {
1183         register char   **dp;
1184
1185         fprintf(stderr, "\nASxxxx Assembler %s  (%s)\n\n", VERSION, cpu);
1186         for (dp = usetxt; *dp; dp++)
1187                 fprintf(stderr, "%s\n", *dp);
1188         asexit(1);
1189 }