Shamusworld >> Repos - rmac/blob - direct.c

   1 //
   2 // RMAC - Reboot's Macro Assembler for the Atari Jaguar Console System
   3 // DIRECT.C - Directive Handling
   4 // Copyright (C) 199x Landon Dyer, 2011 Reboot and Friends
   5 // RMAC derived from MADMAC v1.07 Written by Landon Dyer, 1986
   6 // Source Utilised with the Kind Permission of Landon Dyer
   7 //
   8
   9 #include "direct.h"
  10 #include "sect.h"
  11 #include "risca.h"
  12 #include "error.h"
  13 #include "token.h"
  14 #include "procln.h"
  15 #include "expr.h"
  16 #include "mach.h"
  17 #include "listing.h"
  18 #include "mark.h"
  19 #include "symbol.h"
  20
  21 #define DEF_KW
  22 #include "kwtab.h"
  23
  24 TOKEN exprbuf[128];                                         // Expression buffer
  25
  26 // Directive handler table
  27 int (*dirtab[])() = {
  28    d_org,                                                   // 0 org
  29    d_even,                                                  // 1 even
  30    d_unimpl,                                                // 2 .6502
  31    d_68000,                                                 // 3 .68000
  32    d_bss,                                                   // 4 bss
  33    d_data,                                                  // 5 data
  34    d_text,                                                  // 6 text
  35    d_abs,                                                   // 7 abs
  36    d_comm,                                                  // 8 comm
  37    d_init,                                                  // 9 init
  38    d_cargs,                                                 // 10 cargs
  39    d_goto,                                                  // 11 goto
  40    d_dc,                                                    // 12 dc
  41    d_ds,                                                    // 13 ds
  42    d_undmac,                                                // 14 undefmac
  43    d_gpu,                                                   // 15 .gpu
  44    d_dsp,                                                   // 16 .dsp
  45    d_dcb,                                                   // 17 dcb
  46    d_unimpl,                                                // 18* set
  47    d_unimpl,                                                // 19* reg
  48    d_unimpl,                                                // 20 dump
  49    d_incbin,                                                // 21 .incbin //load
  50    d_unimpl,                                                // 22 disable
  51    d_unimpl,                                                // 23 enable
  52    d_globl,                                                 // 24 globl
  53    d_regbank0,                                              // 25 .regbank0
  54    d_regbank1,                                              // 26 .regbank1
  55    d_unimpl,                                                // 27 xdef
  56    d_assert,                                                // 28 assert
  57    d_unimpl,                                                // 29* if
  58    d_unimpl,                                                // 30* endif
  59    d_unimpl,                                                // 31* endc
  60    d_unimpl,                                                // 32* iif
  61    d_include,                                               // 33 include
  62    fpop,                                                    // 34 end
  63    d_unimpl,                                                // 35* macro
  64    exitmac,                                                 // 36* exitm
  65    d_unimpl,                                                // 37* endm
  66    d_list,                                                  // 38 list
  67    d_nlist,                                                 // 39 nlist
  68    d_long,                                                  // 40* rept
  69    d_phrase,                                                // 41* endr
  70    d_dphrase,                                               // 42 struct
  71    d_qphrase,                                               // 43 ends
  72    d_title,                                                 // 44 title
  73    d_subttl,                                                // 45 subttl
  74    eject,                                                   // 46 eject
  75    d_unimpl,                                                // 47 error
  76    d_unimpl,                                                // 48 warn
  77    d_noclear,                                               // 49 .noclear
  78    d_equrundef,                                             // 50 .equrundef/.regundef
  79    d_ccundef,                                               // 51 .ccundef
  80    d_print,                                                 // 52 .print
  81    d_gpumain,                                               // 53 .gpumain
  82    d_jpad,                                                  // 54 .jpad
  83    d_nojpad,                                                // 55 .nojpad
  84    d_fail,                                                  // 56 .fail
  85 };
  86
  87
  88 //
  89 // .org - Set origin
  90 //
  91 int d_fail(void)
  92 {
  93         fatal("user abort");
  94         return 0;
  95 }
  96
  97
  98 //
  99 // .org - Set origin
 100 //
 101 int d_org(void)
 102 {
 103         VALUE address;
 104
 105         if (!rgpu && !rdsp)
 106                 return error(".org permitted only in gpu/dsp section");
 107
 108         orgaddr = 0;
 109
 110         if (abs_expr(&address) == ERROR)
 111         {
 112                 error("cannot determine org'd address");
 113                 return ERROR;
 114         }
 115
 116         orgaddr = address;
 117         orgactive = 1;
 118
 119         return 0;
 120 }
 121
 122
 123 //
 124 // NOP Padding Directive
 125 //
 126 int d_jpad(void)
 127 {
 128         jpad = 1;
 129         return 0;
 130 }
 131
 132
 133 int d_nojpad(void)
 134 {
 135         jpad = 0;
 136         return 0;
 137 }
 138
 139
 140 //
 141 // Print Directive
 142 //
 143 int d_print(void)
 144 {
 145         char prntstr[LNSIZ];                                     // String for PRINT directive
 146         char format[LNSIZ];                                      // Format for PRINT directive
 147         int formatting = 0;                                      // Formatting on/off
 148         int wordlong = 0;                                        // WORD = 0, LONG = 1
 149         int outtype = 0;                                         // 0:hex, 1:decimal, 2:unsigned
 150
 151         VALUE eval;                                              // Expression value
 152         WORD eattr;                                              // Expression attributes
 153         SYM * esym;                                              // External symbol involved in expr.
 154         TOKEN r_expr[EXPRSIZE];
 155
 156         while (*tok != EOL)
 157         {
 158                 switch(*tok)
 159                 {
 160                 case STRING:
 161                         sprintf(prntstr, "%s", (char *)tok[1]);
 162                         printf("%s", prntstr);
 163
 164                         if (list_fd)
 165                                 write(list_fd, prntstr, (LONG)strlen(prntstr));
 166
 167                         tok += 2;
 168                         break;
 169                 case '/':
 170                         formatting = 1;
 171
 172                         if (tok[1] != SYMBOL)
 173                                 goto token_err;
 174
 175                         strcpy(prntstr, (char *)tok[2]);
 176
 177                         switch(prntstr[0])
 178                         {
 179                         case 'l': case 'L': wordlong = 1; break;
 180                         case 'w': case 'W': wordlong = 0; break;
 181                         case 'x': case 'X': outtype  = 0; break;
 182                         case 'd': case 'D': outtype  = 1; break;
 183                         case 'u': case 'U': outtype  = 2; break;
 184                         default:
 185                                 error("unknown print format flag");
 186                                 return ERROR;
 187                         }
 188
 189                         tok += 3;
 190                         break;
 191                 case ',':
 192                         tok++;
 193                         break;
 194                 default:
 195                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 196                                 goto token_err;
 197                         else
 198                         {
 199                                 switch(outtype)
 200                                 {
 201                                 case 0: strcpy(format, "%X"); break;
 202                                 case 1: strcpy(format, "%d" ); break;
 203                                 case 2: strcpy(format, "%u" ); break;
 204                                 }
 205
 206                                 if (wordlong)
 207                                         sprintf(prntstr, format, eval);
 208                                 else
 209                                         sprintf(prntstr, format, eval & 0xFFFF);
 210
 211                                 printf("%s", prntstr);
 212
 213                                 if (list_fd)
 214                                         write(list_fd, prntstr, (LONG)strlen(prntstr));
 215
 216                                 formatting = 0;
 217                                 wordlong = 0;
 218                                 outtype = 0;
 219                         }
 220
 221                         break;
 222                 }
 223         }
 224
 225         printf("\n");
 226         println("\n");
 227
 228         return 0;
 229
 230 token_err:
 231         error("illegal print token");
 232         return ERROR;
 233 }
 234
 235
 236 //
 237 // Undefine an Equated Condition Code
 238 //
 239 int d_ccundef(void)
 240 {
 241         SYM * ccname;
 242
 243         // Check that we are in a RISC section
 244         if (!rgpu && !rdsp)
 245         {
 246                 error(".ccundef must be defined in .gpu/.dsp section");
 247                 return ERROR;
 248         }
 249
 250         if (*tok != SYMBOL)
 251         {
 252                 error(syntax_error);
 253                 return ERROR;
 254         }
 255
 256         ccname = lookup((char *)tok[1], LABEL, 0);
 257
 258         // Make sure symbol is a valid ccdef
 259         if (!ccname || !(ccname->sattre & EQUATEDCC))
 260         {
 261                 error("invalid equated condition name specified");
 262                 return ERROR;
 263         }
 264
 265         ccname->sattre |= UNDEF_CC;
 266
 267         return 0;
 268 }
 269
 270
 271 //
 272 // Undefine an Equated Register
 273 //
 274 int d_equrundef(void)
 275 {
 276         SYM * regname;
 277
 278         // Check that we are in a RISC section
 279         if (!rgpu && !rdsp)
 280         {
 281                 error(".equrundef/.regundef must be defined in .gpu/.dsp section");
 282                 return ERROR;
 283         }
 284
 285         while (*tok != EOL)
 286         {
 287                 // Skip preceeding or seperating commas
 288                 if (*tok == ',')
 289                         tok++;
 290
 291                 // Check we are dealing with a symbol
 292                 if (*tok != SYMBOL)
 293                 {
 294                         error(syntax_error);
 295                         return ERROR;
 296                 }
 297
 298                 // Lookup and undef if equated register
 299                 regname = lookup((char *)tok[1], LABEL, 0);
 300
 301                 if (regname && (regname->sattre & EQUATEDREG))
 302                         regname->sattre |= UNDEF_EQUR;
 303
 304                 // Skip over symbol token and address
 305                 tok += 2;
 306         }
 307
 308         return 0;
 309 }
 310
 311
 312 //
 313 // Do Not Allow the Use of the CLR.L Opcode
 314 //
 315 int d_noclear(void)
 316 {
 317         return 0;
 318 }
 319
 320
 321 //
 322 // Include Binary File
 323 //
 324 int d_incbin(void)
 325 {
 326         int i, j;
 327         int bytes = 0;
 328         long pos, size;
 329         char buf;
 330
 331         if (*tok != STRING)
 332         {
 333                 error(syntax_error);
 334                 return ERROR;
 335         }
 336
 337         if ((j = open((char *)tok[1],  _OPEN_INC)) >= 0)
 338         {
 339                 size = lseek(j, 0L, SEEK_END);
 340                 chcheck(size);
 341                 pos = lseek(j, 0L, SEEK_SET);
 342
 343                 for(i=0; i<size; i++)
 344                 {
 345                         buf = '\0';
 346                         bytes = read(j, &buf, 1);
 347                         D_byte(buf);
 348                 }
 349         }
 350         else
 351         {
 352                 errors("cannot open include binary file (%s)", (char *)tok[1]);
 353                 return ERROR;
 354         }
 355
 356         close(j);
 357         return 0;
 358 }
 359
 360
 361 //
 362 // Set RISC Register Banks
 363 //
 364 int d_regbank0(void)
 365 {
 366         regbank = BANK_0;                                        // Set active register bank zero
 367         return 0;
 368 }
 369
 370
 371 int d_regbank1(void)
 372 {
 373         regbank = BANK_1;                                        // Set active register bank one
 374         return 0;
 375 }
 376
 377
 378 //
 379 // Adjust Location to an EVEN Value
 380 //
 381 int d_even(void)
 382 {
 383         if (sloc & 1)
 384         {
 385                 if ((scattr & SBSS) == 0)
 386                 {
 387                         chcheck(1);
 388                         D_byte(0);
 389                 }
 390                 else
 391                 {
 392                         ++sloc;
 393                 }
 394         }
 395
 396         return 0;
 397 }
 398
 399
 400 //
 401 // Adjust Location to an LONG Value
 402 //
 403 int d_long(void)
 404 {
 405         unsigned i;
 406         unsigned val = 4;
 407
 408         i = sloc & ~(val - 1);
 409
 410         if (i != sloc)
 411                 val = val - (sloc - i);
 412         else
 413                 val = 0;
 414
 415         if (val)
 416         {
 417                 if ((scattr & SBSS) == 0)
 418                 {
 419                         chcheck(val);
 420
 421                         for(i=0; i<val; i++)
 422                                 D_byte(0);
 423                 }
 424                 else
 425                 {
 426                         sloc += val;
 427                 }
 428         }
 429
 430         return 0;
 431 }
 432
 433
 434 //
 435 // Adjust Location to an PHRASE Value
 436 //
 437 int d_phrase(void)
 438 {
 439         unsigned i;
 440         unsigned val = 8;
 441
 442         i = sloc & ~(val - 1);
 443
 444         if (i != sloc)
 445                 val = val - (sloc - i);
 446         else
 447                 val = 0;
 448
 449         if (val)
 450         {
 451                 if ((scattr & SBSS) == 0)
 452                 {
 453                         chcheck(val);
 454
 455                         for(i=0; i<val; i++)
 456                                 D_byte(0);
 457                 }
 458                 else
 459                 {
 460                         sloc += val;
 461                 }
 462         }
 463
 464         return 0;
 465 }
 466
 467
 468 //
 469 // Adjust Location to an DPHRASE Value
 470 //
 471 int d_dphrase(void)
 472 {
 473         unsigned i;
 474         unsigned val = 16;
 475
 476         i = sloc & ~(val - 1);
 477
 478         if (i != sloc)
 479                 val = val - (sloc - i);
 480         else
 481                 val = 0;
 482
 483         if (val)
 484         {
 485                 if ((scattr & SBSS) == 0)
 486                 {
 487                         chcheck(val);
 488
 489                         for(i=0; i<val; i++)
 490                                 D_byte(0);
 491                 }
 492                 else
 493                 {
 494                         sloc += val;
 495                 }
 496         }
 497
 498         return 0;
 499 }
 500
 501
 502 //
 503 // Adjust Location to an QPHRASE Value
 504 //
 505 int d_qphrase(void)
 506 {
 507         unsigned i;
 508         unsigned val = 32;
 509
 510         i = sloc & ~(val - 1);
 511
 512         if (i != sloc)
 513                 val = val - (sloc - i);
 514         else
 515                 val = 0;
 516
 517         if (val)
 518         {
 519                 if ((scattr & SBSS) == 0)
 520                 {
 521                         savsect();
 522                         chcheck(val);
 523
 524                         for(i=0; i<val; i++)
 525                                 D_byte(0);
 526                 }
 527                 else
 528                 {
 529                         sloc += val;
 530                 }
 531         }
 532
 533         return 0;
 534 }
 535
 536
 537 //
 538 // Do auto-even.  This must be called ONLY if 'sloc' is odd.
 539 //
 540 // This is made hairy because, if there was a label on the line, we also have
 541 // to adjust its value. This won't work with more than one label on the line,
 542 // which is OK since multiple labels are only allowed in AS68 kludge mode, and
 543 // the C compiler is VERY paranoid and uses ".even" whenever it can
 544 //
 545 void auto_even(void)
 546 {
 547         if (scattr & SBSS)
 548                 ++sloc;                                               // Bump BSS section
 549         else
 550                 D_byte(0)                                             // Deposit 0.b in non-BSS
 551
 552         if (lab_sym != NULL)                                      // Bump label if we have to
 553                 ++lab_sym->svalue;
 554 }
 555
 556
 557 //
 558 // Unimplemened Directive Error
 559 //
 560 int d_unimpl(void)
 561 {
 562         return error("unimplemented directive");
 563 }
 564
 565
 566 //
 567 // Return absolute (not TDB) and defined expression or return an error
 568 //
 569 int abs_expr(VALUE * a_eval)
 570 {
 571         WORD eattr;
 572
 573         if (expr(exprbuf, a_eval, &eattr, NULL) < 0)
 574                 return ERROR;
 575
 576         if (!(eattr & DEFINED))
 577                 return error(undef_error);
 578
 579         if (eattr & TDB)
 580                 return error(rel_error);
 581
 582         return OK;
 583 }
 584
 585
 586 //
 587 // Hand symbols in a symbol-list to a function (kind of like mapcar...)
 588 //
 589 int symlist(int(* func)())
 590 {
 591         char * em = "symbol list syntax";
 592
 593         for(;;)
 594         {
 595                 if (*tok != SYMBOL)
 596                         return error(em);
 597
 598                 if ((*func)(tok[1]) != OK)
 599                         break;
 600
 601                 tok += 2;
 602
 603                 if (*tok == EOL)
 604                         break;
 605
 606                 if (*tok != ',')
 607                         return error(em);
 608
 609                 ++tok;
 610         }
 611
 612         return 0;
 613 }
 614
 615
 616 //
 617 // .include "filename"
 618 //
 619 int d_include(void)
 620 {
 621         int j;
 622         int i;
 623         char * fn;
 624         char buf[128];
 625         char buf1[128];
 626
 627         if (*tok == STRING)                                       // Leave strings ALONE
 628                 fn = (char *)*++tok;
 629         else if (*tok == SYMBOL)                                        // Try to append ".s" to symbols
 630         {
 631                 strcpy(buf, (char *)*++tok);
 632                 fext(buf, ".s", 0);
 633                 fn = &buf[0];
 634         }
 635         else                                                   // Punt if no STRING or SYMBOL
 636                 return error("missing filename");
 637
 638         // Make sure the user didn't try anything like:
 639         // .include equates.s
 640         if (*++tok != EOL)
 641                 return error("extra stuff after filename -- enclose it in quotes");
 642
 643         // Attempt to open the include file in the current directory, then (if that failed) try list
 644         // of include files passed in the enviroment string or by the "-d" option.
 645         if ((j = open(fn, 0)) < 0)
 646         {
 647                 for(i=0; nthpath("RMACPATH", i, buf1)!=0; ++i)
 648                 {
 649                         j = strlen(buf1);
 650
 651                         if (j > 0 && buf1[j-1] != SLASHCHAR)                // Append path char if necessary
 652                                 strcat(buf1, SLASHSTRING);
 653
 654                         strcat(buf1, fn);
 655
 656                         if ((j = open(buf1, 0)) >= 0)
 657                                 goto allright;
 658                 }
 659
 660                 return errors("cannot open: \"%s\"", fn);
 661         }
 662
 663 allright:
 664         include(j, fn);
 665         return 0;
 666 }
 667
 668
 669 //
 670 // .assert expression [, expression...]
 671 //
 672 int d_assert(void)
 673 {
 674         WORD eattr;
 675         VALUE eval;
 676
 677         for(; expr(exprbuf, &eval, &eattr, NULL)==OK; ++tok)
 678         {
 679                 if (!(eattr & DEFINED))
 680                         return error("forward or undefined .assert");
 681
 682                 if (!eval)
 683                         return error("assert failure");
 684
 685                 if (*tok != ',')
 686                         break;
 687         }
 688
 689         at_eol();
 690         return 0;
 691 }
 692
 693
 694 //
 695 // .globl symbol [, symbol] <<<cannot make local symbols global>>>
 696 //
 697 int globl1(char * p)
 698 {
 699         SYM *sy;
 700
 701         if (*p == '.')
 702                 return error("cannot .globl local symbol");
 703
 704         if ((sy = lookup(p, LABEL, 0)) == NULL)
 705         {
 706                 sy = newsym(p, LABEL, 0);
 707                 sy->svalue = 0;
 708                 sy->sattr = GLOBAL;
 709         }
 710         else
 711                 sy->sattr |= GLOBAL;
 712
 713         return OK;
 714 }
 715
 716
 717 int d_globl(void)
 718 {
 719         symlist(globl1);
 720         return 0;
 721 }
 722
 723
 724 //
 725 // .abs [expression]
 726 //
 727 int d_abs(void)
 728 {
 729         VALUE eval;
 730
 731         savsect();
 732
 733         if (*tok == EOL)
 734                 eval = 0;
 735         else if (abs_expr(&eval) != OK)
 736                 return 0;
 737
 738         switchsect(ABS);
 739         sloc = eval;
 740         return 0;
 741 }
 742
 743
 744 //
 745 // Switch Segments
 746 //
 747
 748 int d_text(void)
 749 {
 750         if (rgpu || rdsp)
 751                 return error("directive forbidden in gpu/dsp mode");
 752
 753         if (cursect != TEXT)
 754         {
 755                 savsect();
 756                 switchsect(TEXT);
 757         }
 758
 759         return 0;
 760 }
 761
 762
 763 int d_data(void)
 764 {
 765         if (rgpu || rdsp)
 766                 return error("directive forbidden in gpu/dsp mode");
 767
 768         if (cursect != DATA)
 769         {
 770                 savsect();
 771                 switchsect(DATA);
 772         }
 773
 774         return 0;
 775 }
 776
 777
 778 int d_bss(void)
 779 {
 780         if (rgpu || rdsp)
 781                 return error("directive forbidden in gpu/dsp mode");
 782
 783         if (cursect != BSS)
 784         {
 785                 savsect();
 786                 switchsect(BSS);
 787         }
 788
 789         return 0;
 790 }
 791
 792
 793 //
 794 // .ds[.size] expression
 795 //
 796 int d_ds(WORD siz)
 797 {
 798         VALUE eval;
 799
 800         // This gets kind of stupid.  This directive is disallowed in normal 68000
 801         // mode ("for your own good!"), but is permitted for 6502 and Alcyon-
 802         // compatibility modes. For obvious reasons, no auto-even is done in 8-bit
 803         // processor modes.
 804         if (as68_flag == 0 && (scattr & SBSS) == 0)
 805                 return error(".ds permitted only in BSS");
 806
 807         if (siz != SIZB && (sloc & 1))                            // Automatic .even
 808                 auto_even();
 809
 810         if (abs_expr(&eval) != OK)
 811                 return 0;
 812
 813         // In non-TDB section (BSS, ABS and M6502) just advance the location
 814         // counter appropriately. In TDB sections, deposit (possibly large) chunks
 815         //of zeroed memory....
 816         if ((scattr & SBSS))
 817         {
 818                 listvalue(eval);
 819                 eval *= siz;
 820                 sloc += eval;
 821                 just_bss = 1;                                         // No data deposited (8-bit CPU mode)
 822         }
 823         else
 824         {
 825                 dep_block(eval, siz, (VALUE)0, (WORD)(DEFINED|ABS), NULL);
 826         }
 827
 828         at_eol();
 829         return 0;
 830 }
 831
 832
 833 //
 834 // dc.b, dc.w / dc, dc.l
 835 //
 836 int d_dc(WORD siz)
 837 {
 838         WORD eattr;
 839         VALUE eval;
 840         WORD tdb;
 841         WORD defined;
 842         LONG i;
 843         char * p;
 844         int movei = 0; // movei flag for dc.i
 845
 846         if ((scattr & SBSS) != 0)
 847                 return error("illegal initialization of section");
 848
 849         if ((siz != SIZB) && (sloc & 1))
 850                 auto_even();
 851
 852         for(;; ++tok)
 853         {
 854                 // dc.b 'string' [,] ...
 855                 if (siz == SIZB && *tok == STRING && (tok[2] == ',' || tok[2] == EOL))
 856                 {
 857                         i = strlen((const char*)tok[1]);
 858
 859                         if ((challoc - ch_size) < i)
 860                                 chcheck(i);
 861
 862                         for(p=(char *)tok[1]; *p!=EOS; ++p)
 863                                 D_byte(*p);
 864
 865                         tok += 2;
 866                         goto comma;
 867                 }
 868
 869                 if (*tok == 'I')
 870                 {
 871                         movei = 1;
 872                         tok++;
 873                         siz = SIZL;
 874                 }
 875
 876                 // dc.x <expression>
 877                 if (expr(exprbuf, &eval, &eattr, NULL) != OK)
 878                         return 0;
 879
 880                 tdb = (WORD)(eattr & TDB);
 881                 defined = (WORD)(eattr & DEFINED);
 882
 883                 if ((challoc - ch_size) < 4)
 884                         chcheck(4L);
 885
 886                 switch (siz)
 887                 {
 888                 case SIZB:
 889                         if (!defined)
 890                         {
 891                                 fixup(FU_BYTE|FU_SEXT, sloc, exprbuf);
 892                                 D_byte(0);
 893                         }
 894                         else
 895                         {
 896                                 if (tdb)
 897                                         return error("non-absolute byte value");
 898
 899                                 if (eval + 0x100 >= 0x200)
 900                                         return error(range_error);
 901
 902                                 D_byte(eval);
 903                         }
 904
 905                         break;
 906                 case SIZW:
 907                 case SIZN:
 908                         if (!defined)
 909                         {
 910                                 fixup(FU_WORD|FU_SEXT, sloc, exprbuf);
 911                                 D_word(0);
 912                         }
 913                         else
 914                         {
 915                                 if (tdb)
 916                                         rmark(cursect, sloc, tdb, MWORD, NULL);
 917
 918                                 if (eval + 0x10000 >= 0x20000)
 919                                         return error(range_error);
 920
 921                                 // Deposit 68000 or 6502 (byte-reversed) word
 922                                 D_word(eval);
 923                         }
 924
 925                         break;
 926                 case SIZL:
 927                         if (!defined)
 928                         {
 929                                 if (movei)
 930                                         fixup(FU_LONG|FU_MOVEI, sloc, exprbuf);
 931                                 else
 932                                         fixup(FU_LONG, sloc, exprbuf);
 933
 934                                 D_long(0);
 935                         }
 936                         else
 937                         {
 938                                 if (tdb)
 939                                         rmark(cursect, sloc, tdb, MLONG, NULL);
 940
 941                                 if (movei)
 942                                         eval = ((eval >> 16) & 0x0000FFFF) | ((eval << 16) & 0xFFFF0000);
 943
 944                                 D_long(eval);
 945                         }
 946                         break;
 947                 }
 948
 949 comma:
 950                 if (*tok != ',')
 951                         break;
 952         }
 953
 954         at_eol();
 955         return 0;
 956 }
 957
 958
 959 //
 960 // dcb[.siz] expr1,expr2 - Make 'expr1' copies of 'expr2'
 961 //
 962 int d_dcb(WORD siz)
 963 {
 964         VALUE evalc, eval;
 965         WORD eattr;
 966
 967         if ((scattr & SBSS) != 0)
 968                 return error("illegal initialization of section");
 969
 970         if (abs_expr(&evalc) != OK)
 971                 return 0;
 972
 973         if (*tok++ != ',')
 974                 return error("missing comma");
 975
 976         if (expr(exprbuf, &eval, &eattr, NULL) < 0)
 977                 return 0;
 978
 979         if ((siz != SIZB) && (sloc & 1))
 980                 auto_even();
 981
 982         dep_block(evalc, siz, eval, eattr, exprbuf);
 983         return 0;
 984 }
 985
 986
 987 //
 988 // Generalized initialization directive
 989 //
 990 // .init[.siz] [#count,] expression [.size] , ...
 991 //
 992 // The size suffix on the ".init" directive becomes the default size of the
 993 // objects to deposit. If an item is preceeded with a sharp (immediate) sign
 994 // and an expression, it specifies a repeat count. The value to be deposited
 995 // may be followed by a size suffix, which overrides the default size.
 996 //
 997 int d_init(WORD def_siz)
 998 {
 999         VALUE count;
1000         VALUE eval;
1001         WORD eattr;
1002         WORD siz;
1003
1004         if ((scattr & SBSS) != 0)
1005                 return error(".init not permitted in BSS or ABS");
1006
1007         if (rgpu || rdsp)
1008                 return error("directive forbidden in gpu/dsp mode");
1009
1010         for(;;)
1011         {
1012                 // Get repeat count (defaults to 1)
1013                 if (*tok == '#')
1014                 {
1015                         ++tok;
1016
1017                         if (abs_expr(&count) != OK)
1018                                 return 0;
1019
1020                         if (*tok++ != ',')
1021                                 return error(comma_error);
1022                 }
1023                 else
1024                         count = 1;
1025
1026                 // Evaluate expression to deposit
1027                 if (expr(exprbuf, &eval, &eattr, NULL) < 0)
1028                         return 0;
1029
1030                 switch ((int)*tok++)
1031                 {                                 // Determine size of object to deposit
1032                 case DOTB: siz = SIZB; break;
1033                 case DOTW: siz = SIZB; break;
1034                 case DOTL: siz = SIZL; break;
1035                 default:
1036                         siz = def_siz;
1037                         --tok;
1038                         break;
1039                 }
1040
1041                 dep_block(count, siz, eval, eattr, exprbuf);
1042
1043                 switch ((int)*tok)
1044                 {
1045                 case EOL:
1046                         return 0;
1047                 case ',':
1048                         ++tok;
1049                         continue;
1050                 default:
1051                         return error(comma_error);
1052                 }
1053         }
1054 }
1055
1056
1057 //
1058 // Deposit 'count' values of size 'siz' in the current (non-BSS) segment
1059 //
1060 int dep_block(VALUE count, WORD siz, VALUE eval, WORD eattr, TOKEN * exprbuf)
1061 {
1062         WORD tdb;
1063         WORD defined;
1064
1065         tdb = (WORD)(eattr & TDB);
1066         defined = (WORD)(eattr & DEFINED);
1067
1068         while (count--)
1069         {
1070                 if ((challoc - ch_size) < 4)
1071                         chcheck(4L);
1072
1073                 switch(siz)
1074                 {
1075                 case SIZB:
1076                         if (!defined)
1077                         {
1078                                 fixup(FU_BYTE|FU_SEXT, sloc, exprbuf);
1079                                 D_byte(0);
1080                         }
1081                         else
1082                         {
1083                                 if (tdb)
1084                                         return error("non-absolute byte value");
1085
1086                                 if (eval + 0x100 >= 0x200)
1087                                         return error(range_error);
1088
1089                                 D_byte(eval);
1090                         }
1091
1092                         break;
1093                 case SIZW:
1094                 case SIZN:
1095                         if (!defined)
1096                         {
1097                                 fixup(FU_WORD|FU_SEXT, sloc, exprbuf);
1098                                 D_word(0);
1099                         }
1100                         else
1101                         {
1102                                 if (tdb)
1103                                         rmark(cursect, sloc, tdb, MWORD, NULL);
1104
1105                                 if (eval + 0x10000 >= 0x20000)
1106                                         return error(range_error);
1107
1108                                 // Deposit 68000 or 6502 (byte-reversed) word
1109                                 D_word(eval);
1110                         }
1111
1112                         break;
1113                 case SIZL:
1114                         if (!defined)
1115                         {
1116                                 fixup(FU_LONG, sloc, exprbuf);
1117                                 D_long(0);
1118                         }
1119                         else
1120                         {
1121                                 if (tdb)
1122                                         rmark(cursect, sloc, tdb, MLONG, NULL);
1123
1124                                 D_long(eval);
1125                         }
1126
1127                         break;
1128                 }
1129         }
1130
1131         return 0;
1132 }
1133
1134
1135 //
1136 // .comm symbol, size
1137 //
1138 int d_comm(void)
1139 {
1140         SYM * sym;
1141         char * p;
1142         VALUE eval;
1143
1144         if (*tok != SYMBOL)
1145                 return error("missing symbol");
1146
1147         p = (char *)tok[1];
1148         tok += 2;
1149
1150         if (*p == '.')                                            // Cannot .comm a local symbol
1151                 return error(locgl_error);
1152
1153         if ((sym = lookup(p, LABEL, 0)) == NULL)
1154                 sym = newsym(p, LABEL, 0);
1155         else
1156         {
1157                 if (sym->sattr & DEFINED)
1158                         return error(".comm symbol already defined");
1159         }
1160
1161         sym->sattr = GLOBAL|COMMON|BSS;
1162
1163         if (*tok++ != ',')
1164                 return error(comma_error);
1165
1166         if (abs_expr(&eval) != OK)                                // Parse size of common region
1167                 return 0;
1168
1169         sym->svalue = eval;                                      // Install common symbol's size
1170         at_eol();
1171         return 0;
1172 }
1173
1174
1175 //
1176 // .list - Turn listing on
1177 //
1178 int d_list(void)
1179 {
1180         if (list_flag)
1181                 ++listing;
1182
1183         return 0;
1184 }
1185
1186
1187 //
1188 // .nlist - Turn listing off
1189 //
1190 int d_nlist(void)
1191 {
1192         if (list_flag)
1193                 --listing;
1194
1195         return 0;
1196 }
1197
1198
1199 //
1200 // .68000 - Back to 68000 TEXT segment
1201 //
1202 int d_68000(void)
1203 {
1204         rgpu = rdsp = 0;
1205         in_main = 0;
1206         // Switching from gpu/dsp sections should reset any ORG'd Address
1207         orgactive = 0;
1208         orgwarning = 0;
1209         savsect();
1210         switchsect(TEXT);
1211         return 0;
1212 }
1213
1214
1215 //
1216 // .gpu - Switch to GPU Assembler
1217 //
1218 int d_gpu(void)
1219 {
1220         if ((cursect != TEXT) && (cursect != DATA))
1221         {
1222                 error(".gpu can only be used in the TEXT or DATA segments");
1223                 return ERROR;
1224         }
1225
1226         // If previous section was dsp or 68000 then we need to reset ORG'd Addresses
1227         if (!rgpu)
1228         {
1229                 orgactive = 0;
1230                 orgwarning = 0;
1231         }
1232
1233         rgpu = 1;                                                // Set GPU assembly
1234         rdsp = 0;                                                // Unset DSP assembly
1235         regbank = BANK_N;                                        // Set no default register bank
1236         in_main = 0;
1237         jpad = 0;
1238         return 0;
1239 }
1240
1241
1242 //
1243 // GPU Main Code Directive
1244 //
1245
1246 int d_gpumain(void)
1247 {
1248         if ((cursect != TEXT) && (cursect != DATA))
1249         {
1250                 error(".gpumain can only be used in the TEXT or DATA segments");
1251                 return ERROR;
1252         }
1253
1254         // If previous section was dsp or 68000 then we need to reset ORG'd Addresses
1255         if (!rgpu)
1256         {
1257                 orgactive = 0;
1258                 orgwarning = 0;
1259         }
1260
1261         rgpu = 1;                                                // Set GPU assembly
1262         rdsp = 0;                                                // Unset DSP assembly
1263         regbank = BANK_N;                                        // Set no default register bank
1264         in_main = 1;                                             // Enable main code execution rules
1265         jpad = 0;
1266         return 0;
1267 }
1268
1269
1270 //
1271 // .dsp - Switch to DSP Assembler
1272 //
1273 int d_dsp(void)
1274 {
1275         if ((cursect != TEXT) && (cursect != DATA))
1276         {
1277                 error(".dsp can only be used in the TEXT or DATA segments");
1278                 return ERROR;
1279         }
1280
1281         // If previous section was gpu or 68000 then we need to reset ORG'd Addresses
1282         if (!rdsp)
1283         {
1284                 orgactive = 0;
1285                 orgwarning = 0;
1286         }
1287
1288         rdsp = 1;                                                // Set DSP assembly
1289         rgpu = 0;                                                // Unset GPU assembly
1290         regbank = BANK_N;                                        // Set no default register bank
1291         in_main = 0;
1292         jpad = 0;
1293         return 0;
1294 }
1295
1296
1297 //
1298 // .cargs [#offset], symbol[.size], ...
1299 //
1300 // Lists of registers may also be mentioned; they just take up space. Good for
1301 // "documentation" purposes.
1302 //
1303 // .cargs a6,.arg1, .arg2, .arg3...
1304 //
1305 // The symbols are ABS and EQUATED.
1306 //
1307 int d_cargs(void)
1308 {
1309         VALUE eval;
1310         WORD rlist;
1311         SYM * sy;
1312         char * p;
1313         int env;
1314         int i;
1315
1316         if (rgpu || rdsp)
1317                 return error("directive forbidden in gpu/dsp mode");
1318
1319         if (*tok == '#')
1320         {
1321                 ++tok;
1322
1323                 if (abs_expr(&eval) != OK)
1324                         return 0;
1325
1326                 if (*tok == ',')                                       // Eat comma if it's there
1327                         ++tok;
1328         }
1329         else
1330                 eval = 4;
1331
1332         for(;;)
1333         {
1334                 if (*tok == SYMBOL)
1335                 {
1336                         p = (char *)tok[1];
1337
1338                         if (*p == '.')
1339                                 env = curenv;
1340                         else
1341                                 env = 0;
1342
1343                         sy = lookup(p, LABEL, env);
1344
1345                         if (sy == NULL)
1346                         {
1347                                 sy = newsym(p, LABEL, env);
1348                                 sy->sattr = 0;
1349                         }
1350                         else if (sy->sattr & DEFINED)
1351                                 return errors("multiply-defined label '%s'", p);
1352
1353                         // Put symbol in "order of definition" list
1354                         if (!(sy->sattr & SDECLLIST))
1355                                 sym_decl(sy);
1356
1357                         sy->sattr |= ABS|DEFINED|EQUATED;
1358                         sy->svalue = eval;
1359                         tok += 2;
1360
1361                         switch((int)*tok)
1362                         {
1363                         case DOTL:
1364                                 eval += 2;
1365                         case DOTB:
1366                         case DOTW:
1367                                 ++tok;
1368                         }
1369
1370                         eval += 2;
1371                 }
1372                 else
1373                 {
1374                         if (*tok >= KW_D0 && *tok <= KW_A7)
1375                         {
1376                                 if (reglist(&rlist) < 0)
1377                                         return 0;
1378
1379                                 for(i=0; i++<16; rlist>>=1)
1380                                         if (rlist & 1)
1381                                                 eval += 4;
1382                         }
1383                         else
1384                         {
1385                                 switch((int)*tok)
1386                                 {
1387                                 case KW_USP:
1388                                 case KW_SSP:
1389                                 case KW_PC:
1390                                         eval += 2;
1391                                         // FALLTHROUGH
1392                                 case KW_SR:
1393                                 case KW_CCR:
1394                                         eval += 2;
1395                                         ++tok;
1396                                         break;
1397                                 case EOL:
1398                                         return 0;
1399                                 default:
1400                                         return error(".cargs syntax");
1401                                 }
1402                         }
1403
1404                         if (*tok == ',')
1405                                 ++tok;
1406                 }
1407         }
1408 }
1409
1410
1411 //
1412 // Undefine a macro - .undefmac macname [, macname...]
1413 //
1414 int undmac1(char * p)
1415 {
1416         SYM * sy;
1417
1418         // If the macro symbol exists, cause it to dissappear
1419         if ((sy = lookup(p, MACRO, 0)) != NULL)
1420                 sy->stype = (BYTE)SY_UNDEF;
1421
1422         return OK;
1423 }
1424
1425
1426 int d_undmac(void)
1427 {
1428         symlist(undmac1);
1429         return 0;
1430 }