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 SYM * symbolPtr[1000000];       // Symbol pointers table
  26
  27 // Directive handler table
  28 int (*dirtab[])() = {
  29    d_org,                               // 0 org
  30    d_even,                              // 1 even
  31    d_unimpl,                    // 2 .6502
  32    d_68000,                             // 3 .68000
  33    d_bss,                               // 4 bss
  34    d_data,                              // 5 data
  35    d_text,                              // 6 text
  36    d_abs,                               // 7 abs
  37    d_comm,                              // 8 comm
  38    d_init,                              // 9 init
  39    d_cargs,                             // 10 cargs
  40    d_goto,                              // 11 goto
  41    d_dc,                                // 12 dc
  42    d_ds,                                // 13 ds
  43    d_undmac,                    // 14 undefmac
  44    d_gpu,                               // 15 .gpu
  45    d_dsp,                               // 16 .dsp
  46    d_dcb,                               // 17 dcb
  47    d_unimpl,                    // 18* set
  48    d_unimpl,                    // 19* reg
  49    d_unimpl,                    // 20 dump
  50    d_incbin,                    // 21 .incbin //load
  51    d_unimpl,                    // 22 disable
  52    d_unimpl,                    // 23 enable
  53    d_globl,                             // 24 globl
  54    d_regbank0,                  // 25 .regbank0
  55    d_regbank1,                  // 26 .regbank1
  56    d_unimpl,                    // 27 xdef
  57    d_assert,                    // 28 assert
  58    d_unimpl,                    // 29* if
  59    d_unimpl,                    // 30* endif
  60    d_unimpl,                    // 31* endc
  61    d_unimpl,                    // 32* iif
  62    d_include,                   // 33 include
  63    fpop,                                // 34 end
  64    d_unimpl,                    // 35* macro
  65    ExitMacro,                   // 36* exitm
  66    d_unimpl,                    // 37* endm
  67    d_list,                              // 38 list
  68    d_nlist,                             // 39 nlist
  69    d_long,                              // 40* rept
  70    d_phrase,                    // 41* endr
  71    d_dphrase,                   // 42 struct
  72    d_qphrase,                   // 43 ends
  73    d_title,                             // 44 title
  74    d_subttl,                    // 45 subttl
  75    eject,                               // 46 eject
  76    d_unimpl,                    // 47 error
  77    d_unimpl,                    // 48 warn
  78    d_noclear,                   // 49 .noclear
  79    d_equrundef,                 // 50 .equrundef/.regundef
  80    d_ccundef,                   // 51 .ccundef
  81    d_print,                             // 52 .print
  82 //   d_gpumain,                 // 53 .gpumain
  83 //   d_jpad,                            // 54 .jpad
  84 //   d_nojpad,                  // 55 .nojpad
  85 //   d_fail,                            // 56 .fail
  86 };
  87
  88
  89 //
  90 // .org - Set origin
  91 //
  92 int d_org(void)
  93 {
  94         VALUE address;
  95
  96         if (!rgpu && !rdsp)
  97                 return error(".org permitted only in gpu/dsp section");
  98
  99         orgaddr = 0;
 100
 101         if (abs_expr(&address) == ERROR)
 102         {
 103                 error("cannot determine org'd address");
 104                 return ERROR;
 105         }
 106
 107         orgaddr = address;
 108         orgactive = 1;
 109
 110         return 0;
 111 }
 112
 113
 114 //
 115 // Print Directive
 116 //
 117 int d_print(void)
 118 {
 119         char prntstr[LNSIZ];                                     // String for PRINT directive
 120         char format[LNSIZ];                                      // Format for PRINT directive
 121         int formatting = 0;                                      // Formatting on/off
 122         int wordlong = 0;                                        // WORD = 0, LONG = 1
 123         int outtype = 0;                                         // 0:hex, 1:decimal, 2:unsigned
 124
 125         VALUE eval;                                              // Expression value
 126         WORD eattr;                                              // Expression attributes
 127         SYM * esym;                                              // External symbol involved in expr.
 128         TOKEN r_expr[EXPRSIZE];
 129
 130         while (*tok != EOL)
 131         {
 132                 switch(*tok)
 133                 {
 134                 case STRING:
 135 //                      sprintf(prntstr, "%s", (char *)tok[1]);
 136                         sprintf(prntstr, "%s", string[tok[1]]);
 137                         printf("%s", prntstr);
 138
 139                         if (list_fd)
 140                                 write(list_fd, prntstr, (LONG)strlen(prntstr));
 141
 142                         tok += 2;
 143                         break;
 144                 case '/':
 145                         formatting = 1;
 146
 147                         if (tok[1] != SYMBOL)
 148                                 goto token_err;
 149
 150 //                      strcpy(prntstr, (char *)tok[2]);
 151                         strcpy(prntstr, string[tok[2]]);
 152
 153                         switch(prntstr[0])
 154                         {
 155                         case 'l': case 'L': wordlong = 1; break;
 156                         case 'w': case 'W': wordlong = 0; break;
 157                         case 'x': case 'X': outtype  = 0; break;
 158                         case 'd': case 'D': outtype  = 1; break;
 159                         case 'u': case 'U': outtype  = 2; break;
 160                         default:
 161                                 error("unknown print format flag");
 162                                 return ERROR;
 163                         }
 164
 165                         tok += 3;
 166                         break;
 167                 case ',':
 168                         tok++;
 169                         break;
 170                 default:
 171                         if (expr(r_expr, &eval, &eattr, &esym) != OK)
 172                                 goto token_err;
 173                         else
 174                         {
 175                                 switch(outtype)
 176                                 {
 177                                 case 0: strcpy(format, "%X"); break;
 178                                 case 1: strcpy(format, "%d" ); break;
 179                                 case 2: strcpy(format, "%u" ); break;
 180                                 }
 181
 182                                 if (wordlong)
 183                                         sprintf(prntstr, format, eval);
 184                                 else
 185                                         sprintf(prntstr, format, eval & 0xFFFF);
 186
 187                                 printf("%s", prntstr);
 188
 189                                 if (list_fd)
 190                                         write(list_fd, prntstr, (LONG)strlen(prntstr));
 191
 192                                 formatting = 0;
 193                                 wordlong = 0;
 194                                 outtype = 0;
 195                         }
 196
 197                         break;
 198                 }
 199         }
 200
 201         printf("\n");
 202         println("\n");
 203
 204         return 0;
 205
 206 token_err:
 207         error("illegal print token");
 208         return ERROR;
 209 }
 210
 211
 212 //
 213 // Undefine an Equated Condition Code
 214 //
 215 int d_ccundef(void)
 216 {
 217         SYM * ccname;
 218
 219         // Check that we are in a RISC section
 220         if (!rgpu && !rdsp)
 221         {
 222                 error(".ccundef must be defined in .gpu/.dsp section");
 223                 return ERROR;
 224         }
 225
 226         if (*tok != SYMBOL)
 227         {
 228                 error(syntax_error);
 229                 return ERROR;
 230         }
 231
 232 //      ccname = lookup((char *)tok[1], LABEL, 0);
 233         ccname = lookup(string[tok[1]], LABEL, 0);
 234
 235         // Make sure symbol is a valid ccdef
 236         if (!ccname || !(ccname->sattre & EQUATEDCC))
 237         {
 238                 error("invalid equated condition name specified");
 239                 return ERROR;
 240         }
 241
 242         ccname->sattre |= UNDEF_CC;
 243
 244         return 0;
 245 }
 246
 247
 248 //
 249 // Undefine an Equated Register
 250 //
 251 int d_equrundef(void)
 252 {
 253         SYM * regname;
 254
 255         // Check that we are in a RISC section
 256         if (!rgpu && !rdsp)
 257         {
 258                 error(".equrundef/.regundef must be defined in .gpu/.dsp section");
 259                 return ERROR;
 260         }
 261
 262         while (*tok != EOL)
 263         {
 264                 // Skip preceeding or seperating commas
 265                 if (*tok == ',')
 266                         tok++;
 267
 268                 // Check we are dealing with a symbol
 269                 if (*tok != SYMBOL)
 270                 {
 271                         error(syntax_error);
 272                         return ERROR;
 273                 }
 274
 275                 // Lookup and undef if equated register
 276 //              regname = lookup((char *)tok[1], LABEL, 0);
 277                 regname = lookup(string[tok[1]], LABEL, 0);
 278
 279                 if (regname && (regname->sattre & EQUATEDREG))
 280                         regname->sattre |= UNDEF_EQUR;
 281
 282                 // Skip over symbol token and address
 283                 tok += 2;
 284         }
 285
 286         return 0;
 287 }
 288
 289
 290 //
 291 // Do Not Allow the Use of the CLR.L Opcode
 292 //
 293 int d_noclear(void)
 294 {
 295         return 0;
 296 }
 297
 298
 299 //
 300 // Include Binary File
 301 //
 302 int d_incbin(void)
 303 {
 304         int i, j;
 305         int bytes = 0;
 306         long pos, size;
 307         char buf;
 308
 309         // Check to see if we're in BSS, and, if so, throw an error
 310         if (scattr & SBSS)
 311         {
 312                 errors("Cannot include binary file \"%s\" in BSS section", string[tok[1]]);
 313                 return ERROR;
 314         }
 315
 316         if (*tok != STRING)
 317         {
 318                 error(syntax_error);
 319                 return ERROR;
 320         }
 321
 322 //      if ((j = open((char *)tok[1],  _OPEN_INC)) >= 0)
 323         if ((j = open(string[tok[1]],  _OPEN_INC)) >= 0)
 324         {
 325                 size = lseek(j, 0L, SEEK_END);
 326                 chcheck(size);
 327                 pos = lseek(j, 0L, SEEK_SET);
 328
 329                 DEBUG
 330                 {
 331                         printf("INCBIN: File '%s' is %li bytes.\n", string[tok[1]], size);
 332                 }
 333
 334                 for(i=0; i<size; i++)
 335                 {
 336                         buf = '\0';
 337                         bytes = read(j, &buf, 1);
 338                         D_byte(buf);
 339                 }
 340         }
 341         else
 342         {
 343 //              errors("cannot open include binary file (%s)", (char *)tok[1]);
 344                 errors("cannot open include binary file (%s)", string[tok[1]]);
 345                 return ERROR;
 346         }
 347
 348         close(j);
 349         return 0;
 350 }
 351
 352
 353 //
 354 // Set RISC Register Banks
 355 //
 356 int d_regbank0(void)
 357 {
 358         regbank = BANK_0;                                        // Set active register bank zero
 359         return 0;
 360 }
 361
 362
 363 int d_regbank1(void)
 364 {
 365         regbank = BANK_1;                                        // Set active register bank one
 366         return 0;
 367 }
 368
 369
 370 //
 371 // Adjust Location to an EVEN Value
 372 //
 373 int d_even(void)
 374 {
 375         if (sloc & 1)
 376         {
 377                 if ((scattr & SBSS) == 0)
 378                 {
 379                         chcheck(1);
 380                         D_byte(0);
 381                 }
 382                 else
 383                 {
 384                         ++sloc;
 385                 }
 386         }
 387
 388         return 0;
 389 }
 390
 391
 392 //
 393 // Adjust Location to an LONG Value
 394 //
 395 int d_long(void)
 396 {
 397         unsigned i;
 398         unsigned val = 4;
 399
 400         i = sloc & ~(val - 1);
 401
 402         if (i != sloc)
 403                 val = val - (sloc - i);
 404         else
 405                 val = 0;
 406
 407         if (val)
 408         {
 409                 if ((scattr & SBSS) == 0)
 410                 {
 411                         chcheck(val);
 412
 413                         for(i=0; i<val; i++)
 414                                 D_byte(0);
 415                 }
 416                 else
 417                 {
 418                         sloc += val;
 419                 }
 420         }
 421
 422         return 0;
 423 }
 424
 425
 426 //
 427 // Adjust Location to an PHRASE Value
 428 //
 429 int d_phrase(void)
 430 {
 431         unsigned i;
 432         unsigned val = 8;
 433
 434         i = sloc & ~(val - 1);
 435
 436         if (i != sloc)
 437                 val = val - (sloc - i);
 438         else
 439                 val = 0;
 440
 441         if (val)
 442         {
 443                 if ((scattr & SBSS) == 0)
 444                 {
 445                         chcheck(val);
 446
 447                         for(i=0; i<val; i++)
 448                                 D_byte(0);
 449                 }
 450                 else
 451                 {
 452                         sloc += val;
 453                 }
 454         }
 455
 456         return 0;
 457 }
 458
 459
 460 //
 461 // Adjust Location to an DPHRASE Value
 462 //
 463 int d_dphrase(void)
 464 {
 465         unsigned i;
 466         unsigned val = 16;
 467
 468         i = sloc & ~(val - 1);
 469
 470         if (i != sloc)
 471                 val = val - (sloc - i);
 472         else
 473                 val = 0;
 474
 475         if (val)
 476         {
 477                 if ((scattr & SBSS) == 0)
 478                 {
 479                         chcheck(val);
 480
 481                         for(i=0; i<val; i++)
 482                                 D_byte(0);
 483                 }
 484                 else
 485                 {
 486                         sloc += val;
 487                 }
 488         }
 489
 490         return 0;
 491 }
 492
 493
 494 //
 495 // Adjust Location to an QPHRASE Value
 496 //
 497 int d_qphrase(void)
 498 {
 499         unsigned i;
 500         unsigned val = 32;
 501
 502         i = sloc & ~(val - 1);
 503
 504         if (i != sloc)
 505                 val = val - (sloc - i);
 506         else
 507                 val = 0;
 508
 509         if (val)
 510         {
 511                 if ((scattr & SBSS) == 0)
 512                 {
 513                         savsect();
 514                         chcheck(val);
 515
 516                         for(i=0; i<val; i++)
 517                                 D_byte(0);
 518                 }
 519                 else
 520                 {
 521                         sloc += val;
 522                 }
 523         }
 524
 525         return 0;
 526 }
 527
 528
 529 //
 530 // Do auto-even.  This must be called ONLY if 'sloc' is odd.
 531 //
 532 // This is made hairy because, if there was a label on the line, we also have
 533 // to adjust its value. This won't work with more than one label on the line,
 534 // which is OK since multiple labels are only allowed in AS68 kludge mode, and
 535 // the C compiler is VERY paranoid and uses ".even" whenever it can
 536 //
 537 void auto_even(void)
 538 {
 539         if (scattr & SBSS)
 540                 ++sloc;                                               // Bump BSS section
 541         else
 542                 D_byte(0)                                             // Deposit 0.b in non-BSS
 543
 544         if (lab_sym != NULL)                                      // Bump label if we have to
 545                 ++lab_sym->svalue;
 546 }
 547
 548
 549 //
 550 // Unimplemened Directive Error
 551 //
 552 int d_unimpl(void)
 553 {
 554         return error("unimplemented directive");
 555 }
 556
 557
 558 //
 559 // Return absolute (not TDB) and defined expression or return an error
 560 //
 561 int abs_expr(VALUE * a_eval)
 562 {
 563         WORD eattr;
 564
 565         if (expr(exprbuf, a_eval, &eattr, NULL) < 0)
 566                 return ERROR;
 567
 568         if (!(eattr & DEFINED))
 569                 return error(undef_error);
 570
 571         if (eattr & TDB)
 572                 return error(rel_error);
 573
 574         return OK;
 575 }
 576
 577
 578 //
 579 // Hand symbols in a symbol-list to a function (kind of like mapcar...)
 580 //
 581 int symlist(int(* func)())
 582 {
 583         char * em = "symbol list syntax";
 584
 585         for(;;)
 586         {
 587                 if (*tok != SYMBOL)
 588                         return error(em);
 589
 590 #if 0
 591                 if ((*func)(tok[1]) != OK)
 592 #else
 593                 if ((*func)(string[tok[1]]) != OK)
 594 #endif
 595                         break;
 596
 597                 tok += 2;
 598
 599                 if (*tok == EOL)
 600                         break;
 601
 602                 if (*tok != ',')
 603                         return error(em);
 604
 605                 ++tok;
 606         }
 607
 608         return 0;
 609 }
 610
 611
 612 //
 613 // .include "filename"
 614 //
 615 int d_include(void)
 616 {
 617         int j;
 618         int i;
 619         char * fn;
 620         char buf[128];
 621         char buf1[128];
 622
 623         if (*tok == STRING)                                                     // Leave strings ALONE
 624 #if 0
 625                 fn = (char *)*++tok;
 626 #else
 627                 fn = string[*++tok];
 628 #endif
 629         else if (*tok == SYMBOL)                                        // Try to append ".s" to symbols
 630         {
 631 #if 0
 632                 strcpy(buf, (char *)*++tok);
 633 #else
 634                 strcpy(buf, string[*++tok]);
 635 #endif
 636                 fext(buf, ".s", 0);
 637                 fn = &buf[0];
 638         }
 639         else                                                                            // Punt if no STRING or SYMBOL
 640                 return error("missing filename");
 641
 642         // Make sure the user didn't try anything like:
 643         // .include equates.s
 644         if (*++tok != EOL)
 645                 return error("extra stuff after filename -- enclose it in quotes");
 646
 647         // Attempt to open the include file in the current directory, then (if that
 648         // failed) try list of include files passed in the enviroment string or by
 649         // the "-d" option.
 650         if ((j = open(fn, 0)) < 0)
 651         {
 652                 for(i=0; nthpath("RMACPATH", i, buf1)!=0; ++i)
 653                 {
 654                         j = strlen(buf1);
 655
 656                         if (j > 0 && buf1[j-1] != SLASHCHAR)    // Append path char if necessary
 657                                 strcat(buf1, SLASHSTRING);
 658
 659                         strcat(buf1, fn);
 660
 661                         if ((j = open(buf1, 0)) >= 0)
 662                                 goto allright;
 663                 }
 664
 665                 return errors("cannot open: \"%s\"", fn);
 666         }
 667
 668 allright:
 669         include(j, fn);
 670         return 0;
 671 }
 672
 673
 674 //
 675 // .assert expression [, expression...]
 676 //
 677 int d_assert(void)
 678 {
 679         WORD eattr;
 680         VALUE eval;
 681
 682         for(; expr(exprbuf, &eval, &eattr, NULL)==OK; ++tok)
 683         {
 684                 if (!(eattr & DEFINED))
 685                         return error("forward or undefined .assert");
 686
 687                 if (!eval)
 688                         return error("assert failure");
 689
 690                 if (*tok != ',')
 691                         break;
 692         }
 693
 694         at_eol();
 695         return 0;
 696 }
 697
 698
 699 //
 700 // .globl symbol [, symbol] <<<cannot make local symbols global>>>
 701 //
 702 int globl1(char * p)
 703 {
 704         SYM *sy;
 705
 706         if (*p == '.')
 707                 return error("cannot .globl local symbol");
 708
 709         if ((sy = lookup(p, LABEL, 0)) == NULL)
 710         {
 711                 sy = NewSymbol(p, LABEL, 0);
 712                 sy->svalue = 0;
 713                 sy->sattr = GLOBAL;
 714         }
 715         else
 716                 sy->sattr |= GLOBAL;
 717
 718         return OK;
 719 }
 720
 721
 722 int d_globl(void)
 723 {
 724         symlist(globl1);
 725         return 0;
 726 }
 727
 728
 729 //
 730 // .abs [expression]
 731 //
 732 int d_abs(void)
 733 {
 734         VALUE eval;
 735
 736         savsect();
 737
 738         if (*tok == EOL)
 739                 eval = 0;
 740         else if (abs_expr(&eval) != OK)
 741                 return 0;
 742
 743         switchsect(ABS);
 744         sloc = eval;
 745         return 0;
 746 }
 747
 748
 749 //
 750 // Switch Segments
 751 //
 752
 753 int d_text(void)
 754 {
 755         if (rgpu || rdsp)
 756                 return error("directive forbidden in gpu/dsp mode");
 757
 758         if (cursect != TEXT)
 759         {
 760                 savsect();
 761                 switchsect(TEXT);
 762         }
 763
 764         return 0;
 765 }
 766
 767
 768 int d_data(void)
 769 {
 770         if (rgpu || rdsp)
 771                 return error("directive forbidden in gpu/dsp mode");
 772
 773         if (cursect != DATA)
 774         {
 775                 savsect();
 776                 switchsect(DATA);
 777         }
 778
 779         return 0;
 780 }
 781
 782
 783 int d_bss(void)
 784 {
 785         if (rgpu || rdsp)
 786                 return error("directive forbidden in gpu/dsp mode");
 787
 788         if (cursect != BSS)
 789         {
 790                 savsect();
 791                 switchsect(BSS);
 792         }
 793
 794         return 0;
 795 }
 796
 797
 798 //
 799 // .ds[.size] expression
 800 //
 801 int d_ds(WORD siz)
 802 {
 803         VALUE eval;
 804
 805         // This gets kind of stupid.  This directive is disallowed in normal 68000
 806         // mode ("for your own good!"), but is permitted for 6502 and Alcyon-
 807         // compatibility modes. For obvious reasons, no auto-even is done in 8-bit
 808         // processor modes.
 809         if (as68_flag == 0 && (scattr & SBSS) == 0)
 810                 return error(".ds permitted only in BSS");
 811
 812         if (siz != SIZB && (sloc & 1))                            // Automatic .even
 813                 auto_even();
 814
 815         if (abs_expr(&eval) != OK)
 816                 return 0;
 817
 818         // In non-TDB section (BSS, ABS and M6502) just advance the location
 819         // counter appropriately. In TDB sections, deposit (possibly large) chunks
 820         //of zeroed memory....
 821         if ((scattr & SBSS))
 822         {
 823                 listvalue(eval);
 824                 eval *= siz;
 825                 sloc += eval;
 826                 just_bss = 1;                                         // No data deposited (8-bit CPU mode)
 827         }
 828         else
 829         {
 830                 dep_block(eval, siz, (VALUE)0, (WORD)(DEFINED|ABS), NULL);
 831         }
 832
 833         at_eol();
 834         return 0;
 835 }
 836
 837
 838 //
 839 // dc.b, dc.w / dc, dc.l
 840 //
 841 int d_dc(WORD siz)
 842 {
 843         WORD eattr;
 844         VALUE eval;
 845         WORD tdb;
 846         WORD defined;
 847         LONG i;
 848         char * p;
 849         int movei = 0; // movei flag for dc.i
 850
 851         if ((scattr & SBSS) != 0)
 852                 return error("illegal initialization of section");
 853
 854         if ((siz != SIZB) && (sloc & 1))
 855                 auto_even();
 856
 857         for(;; ++tok)
 858         {
 859                 // dc.b 'string' [,] ...
 860                 if (siz == SIZB && *tok == STRING && (tok[2] == ',' || tok[2] == EOL))
 861                 {
 862 //                      i = strlen((const char*)tok[1]);
 863                         i = strlen(string[tok[1]]);
 864
 865                         if ((challoc - ch_size) < i)
 866                                 chcheck(i);
 867
 868                         for(p=string[tok[1]]; *p!=EOS; ++p)
 869                                 D_byte(*p);
 870
 871                         tok += 2;
 872                         goto comma;
 873                 }
 874
 875                 if (*tok == 'I')
 876                 {
 877                         movei = 1;
 878                         tok++;
 879                         siz = SIZL;
 880                 }
 881
 882                 // dc.x <expression>
 883                 if (expr(exprbuf, &eval, &eattr, NULL) != OK)
 884                         return 0;
 885
 886                 tdb = (WORD)(eattr & TDB);
 887                 defined = (WORD)(eattr & DEFINED);
 888
 889                 if ((challoc - ch_size) < 4)
 890                         chcheck(4);
 891
 892                 switch (siz)
 893                 {
 894                 case SIZB:
 895                         if (!defined)
 896                         {
 897                                 fixup(FU_BYTE|FU_SEXT, sloc, exprbuf);
 898                                 D_byte(0);
 899                         }
 900                         else
 901                         {
 902                                 if (tdb)
 903                                         return error("non-absolute byte value");
 904
 905                                 if (eval + 0x100 >= 0x200)
 906                                         return error(range_error);
 907
 908                                 D_byte(eval);
 909                         }
 910
 911                         break;
 912                 case SIZW:
 913                 case SIZN:
 914                         if (!defined)
 915                         {
 916                                 fixup(FU_WORD|FU_SEXT, sloc, exprbuf);
 917                                 D_word(0);
 918                         }
 919                         else
 920                         {
 921                                 if (tdb)
 922                                         rmark(cursect, sloc, tdb, MWORD, NULL);
 923
 924                                 if (eval + 0x10000 >= 0x20000)
 925                                         return error(range_error);
 926
 927                                 // Deposit 68000 or 6502 (byte-reversed) word
 928                                 D_word(eval);
 929                         }
 930
 931                         break;
 932                 case SIZL:
 933                         if (!defined)
 934                         {
 935                                 if (movei)
 936                                         fixup(FU_LONG|FU_MOVEI, sloc, exprbuf);
 937                                 else
 938                                         fixup(FU_LONG, sloc, exprbuf);
 939
 940                                 D_long(0);
 941                         }
 942                         else
 943                         {
 944                                 if (tdb)
 945                                         rmark(cursect, sloc, tdb, MLONG, NULL);
 946
 947                                 if (movei)
 948                                         eval = ((eval >> 16) & 0x0000FFFF) | ((eval << 16) & 0xFFFF0000);
 949
 950                                 D_long(eval);
 951                         }
 952                         break;
 953                 }
 954
 955 comma:
 956                 if (*tok != ',')
 957                         break;
 958         }
 959
 960         at_eol();
 961         return 0;
 962 }
 963
 964
 965 //
 966 // dcb[.siz] expr1,expr2 - Make 'expr1' copies of 'expr2'
 967 //
 968 int d_dcb(WORD siz)
 969 {
 970         VALUE evalc, eval;
 971         WORD eattr;
 972
 973         if ((scattr & SBSS) != 0)
 974                 return error("illegal initialization of section");
 975
 976         if (abs_expr(&evalc) != OK)
 977                 return 0;
 978
 979         if (*tok++ != ',')
 980                 return error("missing comma");
 981
 982         if (expr(exprbuf, &eval, &eattr, NULL) < 0)
 983                 return 0;
 984
 985         if ((siz != SIZB) && (sloc & 1))
 986                 auto_even();
 987
 988         dep_block(evalc, siz, eval, eattr, exprbuf);
 989         return 0;
 990 }
 991
 992
 993 //
 994 // Generalized initialization directive
 995 //
 996 // .init[.siz] [#count,] expression [.size] , ...
 997 //
 998 // The size suffix on the ".init" directive becomes the default size of the
 999 // objects to deposit. If an item is preceeded with a sharp (immediate) sign
1000 // and an expression, it specifies a repeat count. The value to be deposited
1001 // may be followed by a size suffix, which overrides the default size.
1002 //
1003 int d_init(WORD def_siz)
1004 {
1005         VALUE count;
1006         VALUE eval;
1007         WORD eattr;
1008         WORD siz;
1009
1010         if ((scattr & SBSS) != 0)
1011                 return error(".init not permitted in BSS or ABS");
1012
1013         if (rgpu || rdsp)
1014                 return error("directive forbidden in gpu/dsp mode");
1015
1016         for(;;)
1017         {
1018                 // Get repeat count (defaults to 1)
1019                 if (*tok == '#')
1020                 {
1021                         ++tok;
1022
1023                         if (abs_expr(&count) != OK)
1024                                 return 0;
1025
1026                         if (*tok++ != ',')
1027                                 return error(comma_error);
1028                 }
1029                 else
1030                         count = 1;
1031
1032                 // Evaluate expression to deposit
1033                 if (expr(exprbuf, &eval, &eattr, NULL) < 0)
1034                         return 0;
1035
1036                 switch ((int)*tok++)
1037                 {                                 // Determine size of object to deposit
1038                 case DOTB: siz = SIZB; break;
1039                 case DOTW: siz = SIZB; break;
1040                 case DOTL: siz = SIZL; break;
1041                 default:
1042                         siz = def_siz;
1043                         --tok;
1044                         break;
1045                 }
1046
1047                 dep_block(count, siz, eval, eattr, exprbuf);
1048
1049                 switch ((int)*tok)
1050                 {
1051                 case EOL:
1052                         return 0;
1053                 case ',':
1054                         ++tok;
1055                         continue;
1056                 default:
1057                         return error(comma_error);
1058                 }
1059         }
1060 }
1061
1062
1063 //
1064 // Deposit 'count' values of size 'siz' in the current (non-BSS) segment
1065 //
1066 int dep_block(VALUE count, WORD siz, VALUE eval, WORD eattr, TOKEN * exprbuf)
1067 {
1068         WORD tdb;
1069         WORD defined;
1070
1071         tdb = (WORD)(eattr & TDB);
1072         defined = (WORD)(eattr & DEFINED);
1073
1074         while (count--)
1075         {
1076                 if ((challoc - ch_size) < 4)
1077                         chcheck(4L);
1078
1079                 switch(siz)
1080                 {
1081                 case SIZB:
1082                         if (!defined)
1083                         {
1084                                 fixup(FU_BYTE|FU_SEXT, sloc, exprbuf);
1085                                 D_byte(0);
1086                         }
1087                         else
1088                         {
1089                                 if (tdb)
1090                                         return error("non-absolute byte value");
1091
1092                                 if (eval + 0x100 >= 0x200)
1093                                         return error(range_error);
1094
1095                                 D_byte(eval);
1096                         }
1097
1098                         break;
1099                 case SIZW:
1100                 case SIZN:
1101                         if (!defined)
1102                         {
1103                                 fixup(FU_WORD|FU_SEXT, sloc, exprbuf);
1104                                 D_word(0);
1105                         }
1106                         else
1107                         {
1108                                 if (tdb)
1109                                         rmark(cursect, sloc, tdb, MWORD, NULL);
1110
1111                                 if (eval + 0x10000 >= 0x20000)
1112                                         return error(range_error);
1113
1114                                 // Deposit 68000 or 6502 (byte-reversed) word
1115                                 D_word(eval);
1116                         }
1117
1118                         break;
1119                 case SIZL:
1120                         if (!defined)
1121                         {
1122                                 fixup(FU_LONG, sloc, exprbuf);
1123                                 D_long(0);
1124                         }
1125                         else
1126                         {
1127                                 if (tdb)
1128                                         rmark(cursect, sloc, tdb, MLONG, NULL);
1129
1130                                 D_long(eval);
1131                         }
1132
1133                         break;
1134                 }
1135         }
1136
1137         return 0;
1138 }
1139
1140
1141 //
1142 // .comm symbol, size
1143 //
1144 int d_comm(void)
1145 {
1146         SYM * sym;
1147         char * p;
1148         VALUE eval;
1149
1150         if (*tok != SYMBOL)
1151                 return error("missing symbol");
1152
1153 //      p = (char *)tok[1];
1154         p = string[tok[1]];
1155         tok += 2;
1156
1157         if (*p == '.')                                                  // Cannot .comm a local symbol
1158                 return error(locgl_error);
1159
1160         if ((sym = lookup(p, LABEL, 0)) == NULL)
1161                 sym = NewSymbol(p, LABEL, 0);
1162         else
1163         {
1164                 if (sym->sattr & DEFINED)
1165                         return error(".comm symbol already defined");
1166         }
1167
1168         sym->sattr = GLOBAL | COMMON | BSS;
1169
1170         if (*tok++ != ',')
1171                 return error(comma_error);
1172
1173         if (abs_expr(&eval) != OK)                              // Parse size of common region
1174                 return 0;
1175
1176         sym->svalue = eval;                                             // Install common symbol's size
1177         at_eol();
1178         return 0;
1179 }
1180
1181
1182 //
1183 // .list - Turn listing on
1184 //
1185 int d_list(void)
1186 {
1187         if (list_flag)
1188                 ++listing;
1189
1190         return 0;
1191 }
1192
1193
1194 //
1195 // .nlist - Turn listing off
1196 //
1197 int d_nlist(void)
1198 {
1199         if (list_flag)
1200                 --listing;
1201
1202         return 0;
1203 }
1204
1205
1206 //
1207 // .68000 - Back to 68000 TEXT segment
1208 //
1209 int d_68000(void)
1210 {
1211         rgpu = rdsp = 0;
1212 //      in_main = 0;
1213         // Switching from gpu/dsp sections should reset any ORG'd Address
1214         orgactive = 0;
1215         orgwarning = 0;
1216         savsect();
1217         switchsect(TEXT);
1218         return 0;
1219 }
1220
1221
1222 //
1223 // .gpu - Switch to GPU Assembler
1224 //
1225 int d_gpu(void)
1226 {
1227         if ((cursect != TEXT) && (cursect != DATA))
1228         {
1229                 error(".gpu can only be used in the TEXT or DATA segments");
1230                 return ERROR;
1231         }
1232
1233         // If previous section was dsp or 68000 then we need to reset ORG'd Addresses
1234         if (!rgpu)
1235         {
1236                 orgactive = 0;
1237                 orgwarning = 0;
1238         }
1239
1240         rgpu = 1;                                                // Set GPU assembly
1241         rdsp = 0;                                                // Unset DSP assembly
1242         regbank = BANK_N;                                        // Set no default register bank
1243 //      in_main = 0;
1244 //      jpad = 0;
1245         return 0;
1246 }
1247
1248
1249 //
1250 // .dsp - Switch to DSP Assembler
1251 //
1252 int d_dsp(void)
1253 {
1254         if ((cursect != TEXT) && (cursect != DATA))
1255         {
1256                 error(".dsp can only be used in the TEXT or DATA segments");
1257                 return ERROR;
1258         }
1259
1260         // If previous section was gpu or 68000 then we need to reset ORG'd Addresses
1261         if (!rdsp)
1262         {
1263                 orgactive = 0;
1264                 orgwarning = 0;
1265         }
1266
1267         rdsp = 1;                                                // Set DSP assembly
1268         rgpu = 0;                                                // Unset GPU assembly
1269         regbank = BANK_N;                                        // Set no default register bank
1270 //      in_main = 0;
1271 //      jpad = 0;
1272         return 0;
1273 }
1274
1275
1276 //
1277 // .cargs [#offset], symbol[.size], ...
1278 //
1279 // Lists of registers may also be mentioned; they just take up space. Good for
1280 // "documentation" purposes.
1281 //
1282 // .cargs a6,.arg1, .arg2, .arg3...
1283 //
1284 // The symbols are ABS and EQUATED.
1285 //
1286 int d_cargs(void)
1287 {
1288         VALUE eval;
1289         WORD rlist;
1290         SYM * sy;
1291         char * p;
1292         int env;
1293         int i;
1294
1295         if (rgpu || rdsp)
1296                 return error("directive forbidden in gpu/dsp mode");
1297
1298         if (*tok == '#')
1299         {
1300                 ++tok;
1301
1302                 if (abs_expr(&eval) != OK)
1303                         return 0;
1304
1305                 if (*tok == ',')                                        // Eat comma if it's there
1306                         ++tok;
1307         }
1308         else
1309                 eval = 4;
1310
1311         for(;;)
1312         {
1313                 if (*tok == SYMBOL)
1314                 {
1315 //                      p = (char *)tok[1];
1316                         p = string[tok[1]];
1317
1318                         if (*p == '.')
1319                                 env = curenv;
1320                         else
1321                                 env = 0;
1322
1323                         sy = lookup(p, LABEL, env);
1324
1325                         if (sy == NULL)
1326                         {
1327                                 sy = NewSymbol(p, LABEL, env);
1328                                 sy->sattr = 0;
1329                         }
1330                         else if (sy->sattr & DEFINED)
1331                                 return errors("multiply-defined label '%s'", p);
1332
1333                         // Put symbol in "order of definition" list
1334                         if (!(sy->sattr & SDECLLIST))
1335                                 sym_decl(sy);
1336
1337                         sy->sattr |= ABS|DEFINED|EQUATED;
1338                         sy->svalue = eval;
1339                         tok += 2;
1340
1341                         switch((int)*tok)
1342                         {
1343                         case DOTL:
1344                                 eval += 2;
1345                         case DOTB:
1346                         case DOTW:
1347                                 ++tok;
1348                         }
1349
1350                         eval += 2;
1351                 }
1352                 else
1353                 {
1354                         if (*tok >= KW_D0 && *tok <= KW_A7)
1355                         {
1356                                 if (reglist(&rlist) < 0)
1357                                         return 0;
1358
1359                                 for(i=0; i++<16; rlist>>=1)
1360                                         if (rlist & 1)
1361                                                 eval += 4;
1362                         }
1363                         else
1364                         {
1365                                 switch((int)*tok)
1366                                 {
1367                                 case KW_USP:
1368                                 case KW_SSP:
1369                                 case KW_PC:
1370                                         eval += 2;
1371                                         // FALLTHROUGH
1372                                 case KW_SR:
1373                                 case KW_CCR:
1374                                         eval += 2;
1375                                         ++tok;
1376                                         break;
1377                                 case EOL:
1378                                         return 0;
1379                                 default:
1380                                         return error(".cargs syntax");
1381                                 }
1382                         }
1383
1384                         if (*tok == ',')
1385                                 ++tok;
1386                 }
1387         }
1388 }
1389
1390
1391 //
1392 // Undefine a macro - .undefmac macname [, macname...]
1393 //
1394 int undmac1(char * p)
1395 {
1396         SYM * sy;
1397
1398         // If the macro symbol exists, cause it to dissappear
1399         if ((sy = lookup(p, MACRO, 0)) != NULL)
1400                 sy->stype = (BYTE)SY_UNDEF;
1401
1402         return OK;
1403 }
1404
1405
1406 int d_undmac(void)
1407 {
1408         symlist(undmac1);
1409         return 0;
1410 }