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

   1 //
   2 // RMAC - Renamed Macro Assembler for all Atari computers
   3 // RMAC.C - Main Application Code
   4 // Copyright (C) 199x Landon Dyer, 2011-2021 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 "rmac.h"
  10 #include "6502.h"
  11 #include "debug.h"
  12 #include "direct.h"
  13 #include "dsp56k.h"
  14 #include "error.h"
  15 #include "expr.h"
  16 #include "listing.h"
  17 #include "mark.h"
  18 #include "macro.h"
  19 #include "object.h"
  20 #include "procln.h"
  21 #include "riscasm.h"
  22 #include "sect.h"
  23 #include "symbol.h"
  24 #include "token.h"
  25 #include "version.h"
  26
  27 int perm_verb_flag;                             // Permanently verbose, interactive mode
  28 int list_flag;                                  // "-l" listing flag on command line
  29 int list_pag = 1;                               // Enable listing pagination by default
  30 int verb_flag;                                  // Be verbose about what's going on
  31 int m6502;                                              // 1, assembling 6502 code
  32 int glob_flag;                                  // Assume undefined symbols are global
  33 int lsym_flag;                                  // Include local symbols in object file
  34 int optim_warn_flag;                    // Warn about possible short branches
  35 int prg_flag;                                   // !=0, produce .PRG executable (2=symbols)
  36 int prg_extend;                                 // !=0, output extended .PRG symbols
  37 int legacy_flag;                                // Do stuff like insert code in RISC assembler
  38 int obj_format;                                 // Object format flag
  39 int debug;                                              // [1..9] Enable debugging levels
  40 int err_flag;                                   // '-e' specified
  41 int err_fd;                                             // File to write error messages to
  42 int rgpu, rdsp;                                 // Assembling Jaguar GPU or DSP code
  43 int robjproc;                                   // Assembling Jaguar Object Processor code
  44 int dsp56001;                                   // Assembling DSP 56001 code
  45 int list_fd;                                    // File to write listing to
  46 int regbank;                                    // RISC register bank
  47 int segpadsize;                                 // Segment padding size
  48 int endian;                                             // Host processor endianess (0 = LE, 1 = BE)
  49 char * objfname;                                // Object filename pointer
  50 char * firstfname;                              // First source filename
  51 char * cmdlnexec;                               // Executable name, pointer to ARGV[0]
  52 char searchpatha[512] = { 0 };  // Buffer to hold searchpath when specified
  53 char * searchpath = NULL;               // Search path for include files
  54 char defname[] = "noname.o";    // Default output filename
  55 int optim_flags[OPT_COUNT_ALL] = { 0 }; // Specific optimisations on/off matrix
  56 int activecpu = CPU_68000;              // Active 68k CPU (68000 by default)
  57 int activefpu = FPU_NONE;               // Active FPU (none by default)
  58 int org68k_active = 0;                  // .org switch for 68k (only with RAW output format)
  59 uint32_t org68k_address;                // .org for 68k
  60
  61 //
  62 // Convert a string to uppercase
  63 //
  64 void strtoupper(char * s)
  65 {
  66         while (*s)
  67                 *s++ &= 0xDF;
  68 }
  69
  70 //
  71 // Manipulate file extension.
  72 //
  73 // 'name' must be large enough to hold any possible filename. If 'stripp' is
  74 // nonzero, any old extension is removed. If the file does not already have an
  75 // extension, 'extension' is appended to the filename.
  76 //
  77 char * fext(char * name, char * extension, int stripp)
  78 {
  79         char * s;
  80
  81         // Find beginning of "real" name (strip off path)
  82         char * beg = strrchr(name, SLASHCHAR);
  83
  84         if (beg == NULL)
  85                 beg = name;
  86
  87         // Clobber any old extension, if requested
  88         if (stripp)
  89         {
  90                 for(s=beg; *s && *s!='.'; ++s)
  91                         ;
  92
  93                 *s = '\0';
  94         }
  95
  96         if (strrchr(beg, '.') == NULL)
  97                 strcat(beg, extension);
  98
  99         return name;
 100 }
 101
 102 static int is_sep(char c)
 103 {
 104     const char *seps = PATH_SEPS;
 105
 106     for (seps = PATH_SEPS; *seps; seps++) {
 107         if (*seps == c)
 108             return 1;
 109     }
 110
 111     return 0;
 112 }
 113
 114 //
 115 // Return 'item'nth element of semicolon-seperated pathnames specified in the
 116 // enviroment string 's'. Copy the pathname to 'buf'.  Return 0 if the 'item'
 117 // nth path doesn't exist.
 118 //
 119 // ['item' ranges from 0 to N-1, where N = #elements in search path]
 120 //
 121 int nthpath(char * env_var, int itemno, char * buf)
 122 {
 123         char * s = searchpath;
 124
 125         if (s == NULL)
 126                 s = getenv(env_var);
 127
 128         if (s == NULL)
 129                 return 0;
 130
 131         while (itemno--)
 132                 while (*s != EOS && !is_sep(*s++))
 133                         ;
 134
 135         if (*s == EOS)
 136                 return 0;
 137
 138         while (*s != EOS && !is_sep(*s))
 139                 *buf++ = *s++;
 140
 141         *buf++ = EOS;
 142
 143         return 1;
 144 }
 145
 146 //
 147 // Display command line help
 148 //
 149 void DisplayHelp(void)
 150 {
 151         printf("Usage:\n"
 152                 "    %s [options] srcfile\n"
 153                 "\n"
 154                 "Options:\n"
 155                 "  -? or -h          Display usage information\n"
 156                 "  -dsymbol[=value]  Define symbol (with optional value, default=0)\n"
 157                 "  -e[errorfile]     Send error messages to file, not stdout\n"
 158                 "  -f[format]        Output object file format\n"
 159                 "                    a: ALCYON\n"
 160                 "                    b: BSD (use this for Jaguar)\n"
 161                 "                    e: ELF\n"
 162                 "                    p: P56 (use this for DSP56001 only)\n"
 163                 "                    l: LOD (use this for DSP56001 only)\n"
 164                 "                    x: com/exe/xex (Atari 800)\n"
 165                 "                    r: absolute address\n"
 166                 "  -i[path]          Directory to search for include files\n"
 167                 "  -l[filename]      Create an output listing file\n"
 168                 "  -l*[filename]     Create an output listing file without pagination\n"
 169                 "  -m[cpu]           Select default CPU. Available options:\n"
 170                 "                    68000, 68020, 68030, 68040, 68060, 6502, tom, jerry, 56001\n"
 171                 "  -n                Don't do things behind your back in RISC assembler\n"
 172                 "  -o file           Output file name\n"
 173                 "  +o[value]         Turn a specific optimisation on\n"
 174                 "                    Available optimisation switches:\n"
 175                 "                    o0: Absolute long addresses to word\n"
 176                 "                    o1: move.l #x,dn/an to moveq\n"
 177                 "                    o2: Word branches to short\n"
 178                 "                    o3: Outer displacement 0(an) to (an)\n"
 179                 "                    o4: lea size(An),An to addq #size,An\n"
 180                 "                    o5: 68020+ Absolute long base/outer disp. to word\n"
 181                 "                    o6: Null branches to NOP\n"
 182                 "                    o7: clr.l Dx to moveq #0,Dx\n"
 183                 "                    o8: adda.w/l #x,Dy to addq.w/l #x,Dy\n"
 184                 "                    o9: adda.w/l #x,Ay to lea x(Dy),Ay\n"
 185                 "                    o10: 56001 Use short format for immediate values if possible\n"
 186                 "                    o11: 56001 Auto convert short addressing mode to long (default: on)\n"
 187                 "                    o30: Enforce PC relative (alternative name: op)\n"
 188                 "  ~o[value]         Turn a specific optimisation off\n"
 189                 "  +oall             Turn all optimisations on\n"
 190                 "  ~oall             Turn all optimisations off\n"
 191                 "  -p                Create an ST .prg (without symbols). Forces -fa\n"
 192                 "  -ps               Create an ST .prg (with symbols). Forces -fa\n"
 193                 "  -px               Create an ST .prg (with exsymbols). Forces -fa\n"
 194                 "  -r[size]          Pad segments to boundary size specified\n"
 195                 "                    w: word (2 bytes, default alignment)\n"
 196                 "                    l: long (4 bytes)\n"
 197                 "                    p: phrase (8 bytes)\n"
 198                 "                    d: double phrase (16 bytes)\n"
 199                 "                    q: quad phrase (32 bytes)\n"
 200                 "  -s                Warn about possible short branches\n"
 201                 "                    and applied optimisations\n"
 202                 "  -u                Force referenced and undefined symbols global\n"
 203                 "  -v                Set verbose mode\n"
 204                 "  -x                Turn on debugging mode\n"
 205                 "  -y[pagelen]       Set page line length (default: 61)\n"
 206                 "\n", cmdlnexec);
 207 }
 208
 209
 210 //
 211 // Display version information
 212 //
 213 void DisplayVersion(void)
 214 {
 215         printf("\n"
 216                 " _ __ _ __ ___   __ _  ___ \n"
 217                 "| '__| '_ ` _ \\ / _` |/ __|\n"
 218                 "| |  | | | | | | (_| | (__ \n"
 219                 "|_|  |_| |_| |_|\\__,_|\\___|\n"
 220                 "\nRenamed Macro Assembler\n"
 221                 "Copyright (C) 199x Landon Dyer, 2011-2021 Reboot and Friends\n"
 222                 "V%01i.%01i.%01i %s (%s)\n\n", MAJOR, MINOR, PATCH, __DATE__, PLATFORM);
 223 }
 224
 225 //
 226 // Parse optimisation options
 227 //
 228 int ParseOptimization(char * optstring)
 229 {
 230         int onoff = 0;
 231
 232         while (*optstring)
 233         {
 234                 if (*optstring == '+')
 235                         onoff = 1;
 236                 else if (*optstring != '~')
 237                         return ERROR;
 238
 239         if (optstring[2] == 0)
 240             return error(".opt called with zero arguments");
 241
 242                 if ((optstring[2] == 'a' || optstring[2] == 'A')
 243                         && (optstring[3] == 'l' || optstring[3] == 'L')
 244                         && (optstring[4] == 'l' || optstring[4] == 'L'))
 245                 {
 246                         memset(optim_flags, onoff, OPT_COUNT * sizeof(int));
 247                         optstring += 5;
 248                 }
 249                 else if (optstring[1] == 'o' || optstring[1] == 'O') // Turn on specific optimisation
 250                 {
 251                         if (optstring[2] == 'p' || optstring[2] == 'P')
 252                         {
 253                                 optim_flags[OPT_PC_RELATIVE] = onoff;
 254                                 optstring += 3;
 255                         }
 256                         else
 257                         {
 258                                 int opt_no = atoi(&optstring[2]);
 259
 260                                 if ((opt_no >= 0) && (opt_no < OPT_COUNT))
 261                                 {
 262                                         optim_flags[opt_no] = onoff;
 263                                         optstring += 3;
 264
 265                                         // If opt_no is 2 digits then consume an extra character.
 266                                         // Sounds a bit sleazy but we know we're not going to hit
 267                                         // more than 100 optimisation switches so this should be
 268                                         // fine. If we do hit that number then it'll probably be
 269                                         // time to burn the whole codebase and start from scratch.
 270                                         if (opt_no > 9)
 271                                                 optstring++;
 272                                 }
 273                                 else
 274                                         return ERROR;
 275                         }
 276                 }
 277                 else
 278                 {
 279                         return ERROR;
 280                 }
 281
 282                 if (*optstring == ',')
 283                         optstring++;
 284         }
 285         return OK;
 286 }
 287
 288 //
 289 // Process command line arguments and do an assembly
 290 //
 291 int Process(int argc, char ** argv)
 292 {
 293         int argno;                                              // Argument number
 294         SYM * sy;                                               // Pointer to a symbol record
 295         char * s;                                               // String pointer
 296         int fd;                                                 // File descriptor
 297         char fnbuf[FNSIZ];                              // Filename buffer
 298         int i;                                                  // Iterator
 299         int current_path_index = 0;             // Iterator for search paths
 300
 301         errcnt = 0;                                             // Initialize error count
 302         listing = 0;                                    // Initialize listing level
 303         list_flag = 0;                                  // Initialize listing flag
 304         verb_flag = perm_verb_flag;             // Initialize verbose flag
 305         glob_flag = 0;                                  // Initialize .globl flag
 306         optim_warn_flag = 0;                    // Initialize short branch flag
 307         debug = 0;                                              // Initialize debug flag
 308         objfname = NULL;                                // Initialize object filename
 309         list_fname = NULL;                              // Initialize listing filename
 310         err_fname = NULL;                               // Initialize error filename
 311         obj_format = BSD;                               // Initialize object format
 312         firstfname = NULL;                              // Initialize first filename
 313         err_fd = ERROUT;                                // Initialize error file descriptor
 314         err_flag = 0;                                   // Initialize error flag
 315         rgpu = 0;                                               // Initialize GPU assembly flag
 316         rdsp = 0;                                               // Initialize DSP assembly flag
 317         robjproc = 0;                                   // Initialize OP assembly flag
 318         lsym_flag = 1;                                  // Include local symbols in object file
 319         regbank = BANK_N;                               // No RISC register bank specified
 320         orgactive = 0;                                  // Not in RISC org section
 321         orgwarning = 0;                                 // No ORG warning issued
 322         segpadsize = 2;                                 // Initialize segment padding size
 323     dsp_orgmap[0].start = 0;            // Initialize 56001 org initial address
 324     dsp_orgmap[0].memtype = ORG_P;      // Initialize 56001 org start segment
 325         m6502 = 0;                                              // 6502 mode off by default
 326
 327         // Initialize modules
 328         InitSymbolTable();                              // Symbol table
 329         InitTokenizer();                                // Tokenizer
 330         InitLineProcessor();                    // Line processor
 331         InitExpression();                               // Expression analyzer
 332         InitSection();                                  // Section manager / code generator
 333         InitMark();                                             // Mark tape-recorder
 334         InitMacro();                                    // Macro processor
 335         InitListing();                                  // Listing generator
 336         Init6502();                                             // 6502 assembler
 337
 338         // Process command line arguments and assemble source files
 339         for(argno=0; argno<argc; argno++)
 340         {
 341                 if (*argv[argno] == '-')
 342                 {
 343                         switch (argv[argno][1])
 344                         {
 345                         case 'd':                               // Define symbol
 346                         case 'D':
 347                                 for(s=argv[argno]+2; *s!=EOS;)
 348                                 {
 349                                         if (*s++ == '=')
 350                                         {
 351                                                 s[-1] = EOS;
 352                                                 break;
 353                                         }
 354                                 }
 355
 356                                 if (argv[argno][2] == EOS)
 357                                 {
 358                                         printf("-d: empty symbol\n");
 359                                         errcnt++;
 360                                         return errcnt;
 361                                 }
 362
 363                                 sy = lookup(argv[argno] + 2, 0, 0);
 364
 365                                 if (sy == NULL)
 366                                 {
 367                                         sy = NewSymbol(argv[argno] + 2, LABEL, 0);
 368                                         sy->svalue = 0;
 369                                 }
 370
 371                                 sy->sattr = DEFINED | EQUATED | ABS;
 372                                 sy->svalue = (*s ? (uint64_t)atoi(s) : 0);
 373                                 break;
 374                         case 'e':                               // Redirect error message output
 375                         case 'E':
 376                                 err_fname = argv[argno] + 2;
 377                                 break;
 378                         case 'f':                               // -f<format>
 379                         case 'F':
 380                                 switch (argv[argno][2])
 381                                 {
 382                                 case EOS:
 383                                 case 'a':                       // -fa = Alcyon [the default]
 384                                 case 'A':
 385                                         obj_format = ALCYON;
 386                                         break;
 387                                 case 'b':                       // -fb = BSD (Jaguar Recommended: 3 out 4 jaguars recommend it!)
 388                                 case 'B':
 389                                         obj_format = BSD;
 390                                         break;
 391                                 case 'e':                       // -fe = ELF
 392                                 case 'E':
 393                                         obj_format = ELF;
 394                                         break;
 395                 case 'l':           // -fl = LOD
 396                 case 'L':
 397                     obj_format = LOD;
 398                     break;
 399                 case 'p':           // -fp = P56
 400                 case 'P':
 401                     obj_format = P56;
 402                                         break;
 403                                 case 'x':                       // -fx = COM/EXE/XEX
 404                                 case 'X':
 405                                         obj_format = XEX;
 406                                         break;
 407                 case 'r':           // -fr = Absolute address
 408                 case 'R':
 409                     obj_format = RAW;
 410                     break;
 411                                 default:
 412                                         printf("-f: unknown object format specified\n");
 413                                         errcnt++;
 414                                         return errcnt;
 415                                 }
 416                                 break;
 417                         case 'g':                               // Debugging flag
 418                         case 'G':
 419                                 printf("Debugging flag (-g) not yet implemented\n");
 420                                 break;
 421                         case 'i':                               // Set directory search path
 422                         case 'I':
 423                         {
 424                                 strcat(searchpatha, argv[argno] + 2);
 425                                 strcat(searchpatha, ";");
 426                                 searchpath = searchpatha;
 427
 428                                 // Check to see if include paths actually exist
 429                                 char current_path[256];
 430
 431                                 for(i=current_path_index; nthpath("RMACPATH", i, current_path)!=0; i++)
 432                                 {
 433                                         if (strlen(current_path) > 0)
 434                                         {
 435                                                 DIR * test = opendir(current_path);
 436
 437                                                 if (test == NULL)
 438                                                 {
 439                                                         printf("Invalid include path: %s\n", current_path);
 440                                                         errcnt++;
 441                                                         return errcnt;
 442                                                 }
 443
 444                                                 closedir(test);
 445                                         }
 446                                 }
 447
 448                                 current_path_index = i - 1;
 449                                 break;
 450                         }
 451                         case 'l':                               // Produce listing file
 452                         case 'L':
 453                                 if (*(argv[argno] + 2) == '*')
 454                                 {
 455                                         list_fname = argv[argno] + 3;
 456                                         list_pag = 0;    // Special case - turn off pagination
 457                                 }
 458                                 else
 459                                 {
 460                                         list_fname = argv[argno] + 2;
 461                                 }
 462
 463                                 listing = 1;
 464                                 list_flag = 1;
 465                                 lnsave++;
 466                                 break;
 467                         case 'm':
 468                         case 'M':
 469                                 if (strcmp(argv[argno] + 2, "68000") == 0)
 470                                         d_68000();
 471                                 else if (strcmp(argv[argno] + 2, "68020") == 0)
 472                                         d_68020();
 473                                 else if (strcmp(argv[argno] + 2, "68030") == 0)
 474                                         d_68030();
 475                                 else if (strcmp(argv[argno] + 2, "68040") == 0)
 476                                         d_68040();
 477                                 else if (strcmp(argv[argno] + 2, "68060") == 0)
 478                                         d_68060();
 479                                 else if (strcmp(argv[argno] + 2, "68881") == 0)
 480                                         d_68881();
 481                                 else if (strcmp(argv[argno] + 2, "68882") == 0)
 482                                         d_68882();
 483                                 else if (strcmp(argv[argno] + 2, "56001") == 0)
 484                                         d_56001();
 485                                 else if (strcmp(argv[argno] + 2, "6502") == 0)
 486                                         d_6502();
 487                                 else if (strcmp(argv[argno] + 2, "tom") == 0)
 488                                         d_gpu();
 489                                 else if (strcmp(argv[argno] + 2, "jerry") == 0)
 490                                         d_dsp();
 491                                 else
 492                                 {
 493                                         printf("Unrecognized CPU '%s'\n", argv[argno] + 2);
 494                                         errcnt++;
 495                                         return errcnt;
 496                                 }
 497                                 break;
 498                         case 'o':                               // Direct object file output
 499                         case 'O':
 500                                 if (argv[argno][2] != EOS)
 501                                         objfname = argv[argno] + 2;
 502                                 else
 503                                 {
 504                                         if (++argno >= argc)
 505                                         {
 506                                                 printf("Missing argument to -o");
 507                                                 errcnt++;
 508                                                 return errcnt;
 509                                         }
 510
 511                                         objfname = argv[argno];
 512                                 }
 513
 514                                 break;
 515                         case 'p':               /* -p: generate ".PRG" executable output */
 516                         case 'P':
 517                                 /*
 518                                  * -p           .PRG generation w/o symbols
 519                                  * -ps          .PRG generation with symbols
 520                                  * -px          .PRG generation with extended symbols
 521                                  */
 522                                 switch (argv[argno][2])
 523                                 {
 524                                         case EOS:
 525                                                 prg_flag = 1;
 526                                                 break;
 527
 528                                         case 's':
 529                                         case 'S':
 530                                                 prg_flag = 2;
 531                                                 break;
 532
 533                                         case 'x':
 534                                         case 'X':
 535                                                 prg_flag = 3;
 536                                                 break;
 537
 538                                         default:
 539                                                 printf("-p: syntax error\n");
 540                                                 errcnt++;
 541                                                 return errcnt;
 542                                 }
 543
 544                                 // Enforce Alcyon object format - kind of silly
 545                                 // to ask for .prg output without it!
 546                                 obj_format = ALCYON;
 547                                 break;
 548                         case 'r':                               // Pad seg to requested boundary size
 549                         case 'R':
 550                                 switch(argv[argno][2])
 551                                 {
 552                                 case 'w': case 'W': segpadsize = 2;  break;
 553                                 case 'l': case 'L': segpadsize = 4;  break;
 554                                 case 'p': case 'P': segpadsize = 8;  break;
 555                                 case 'd': case 'D': segpadsize = 16; break;
 556                                 case 'q': case 'Q': segpadsize = 32; break;
 557                                 default: segpadsize = 2; break; // Effective autoeven();
 558                                 }
 559                                 break;
 560                         case 's':                               // Warn about possible short branches and applied optimisations
 561                         case 'S':
 562                                 optim_warn_flag = 1;
 563                                 break;
 564                         case 'u':                               // Make undefined symbols .globl
 565                         case 'U':
 566                                 glob_flag = 1;
 567                                 break;
 568                         case 'v':                               // Verbose flag
 569                         case 'V':
 570                                 verb_flag++;
 571
 572                                 if (verb_flag > 1)
 573                                         DisplayVersion();
 574
 575                                 break;
 576                         case 'x':                               // Turn on debugging
 577                         case 'X':
 578                                 debug = 1;
 579                                 printf("~ Debugging ON\n");
 580                                 break;
 581                         case 'y':                               // -y<pagelen>
 582                         case 'Y':
 583                                 pagelen = atoi(argv[argno] + 2);
 584
 585                                 if (pagelen < 10)
 586                                 {
 587                                         printf("-y: bad page length\n");
 588                                         errcnt++;
 589                                         return errcnt;
 590                                 }
 591
 592                                 break;
 593                         case EOS:                               // Input is stdin
 594                                 if (firstfname == NULL) // Kludge first filename
 595                                         firstfname = defname;
 596
 597                                 include(0, "(stdin)");
 598                                 Assemble();
 599                                 break;
 600                         case 'h':                               // Display command line usage
 601                         case 'H':
 602                         case '?':
 603                                 DisplayVersion();
 604                                 DisplayHelp();
 605                                 errcnt++;
 606                                 break;
 607                         case 'n':                               // Turn off legacy mode
 608                         case 'N':
 609                                 legacy_flag = 0;
 610                                 printf("Legacy mode OFF\n");
 611                                 break;
 612                         default:
 613                                 DisplayVersion();
 614                                 printf("Unknown switch: %s\n\n", argv[argno]);
 615                                 DisplayHelp();
 616                                 errcnt++;
 617                                 break;
 618                         }
 619                 }
 620                 else if (*argv[argno] == '+' || *argv[argno] == '~')
 621                 {
 622                         if (ParseOptimization(argv[argno]) != OK)
 623                         {
 624                                 DisplayVersion();
 625                                 printf("Unknown switch: %s\n\n", argv[argno]);
 626                                 DisplayHelp();
 627                                 errcnt++;
 628                                 break;
 629                         }
 630                 }
 631                 else
 632                 {
 633                         // Record first filename.
 634                         if (firstfname == NULL)
 635                                 firstfname = argv[argno];
 636
 637                         strcpy(fnbuf, argv[argno]);
 638                         fext(fnbuf, ".s", 0);
 639                         fd = open(fnbuf, 0);
 640
 641                         if (fd < 0)
 642                         {
 643                                 printf("Cannot open: %s\n", fnbuf);
 644                                 errcnt++;
 645                                 continue;
 646                         }
 647
 648                         include(fd, fnbuf);
 649                         Assemble();
 650                 }
 651         }
 652
 653         // Wind-up processing;
 654         // o  save current section (no more code generation)
 655         // o  do auto-even of all sections (or boundary alignment as requested
 656         //    through '-r')
 657     // o  save the last pc value for 6502 (if we used 6502 at all) and
 658     //    detemine if the last section contains anything
 659         // o  determine name of object file:
 660         //    -  "foo.o" for linkable output;
 661         //    -  "foo.prg" for GEMDOS executable (-p flag).
 662         SaveSection();
 663         int temp_section = cursect;
 664
 665         for(i=TEXT; i<=BSS; i<<=1)
 666         {
 667                 SwitchSection(i);
 668
 669                 switch(segpadsize)
 670                 {
 671                 case 2:  d_even();    break;
 672                 case 4:  d_long();    break;
 673                 case 8:  d_phrase();  break;
 674                 case 16: d_dphrase(); break;
 675                 case 32: d_qphrase(); break;
 676                 }
 677
 678                 SaveSection();
 679         }
 680
 681         SwitchSection(M6502);
 682
 683         if (sloc != currentorg[0])
 684         {
 685                 currentorg[1] = sloc;
 686                 currentorg += 2;
 687         }
 688
 689         // This looks like an awful kludge...  !!! FIX !!!
 690         if (temp_section & (M56001P | M56001X | M56001Y))
 691         {
 692                 SwitchSection(temp_section);
 693
 694                 if (chptr != dsp_currentorg->start)
 695                 {
 696                         dsp_currentorg->end = chptr;
 697                         dsp_currentorg++;
 698                 }
 699         }
 700
 701         SwitchSection(TEXT);
 702
 703         if (objfname == NULL)
 704         {
 705                 if (firstfname == NULL)
 706                         firstfname = defname;
 707
 708                 strcpy(fnbuf, firstfname);
 709                 fext(fnbuf, (prg_flag ? ".prg" : ".o"), 1);
 710                 objfname = fnbuf;
 711         }
 712
 713         // With one pass finished, go back and:
 714         // (1)   run through all the fixups and resolve forward references;
 715         // (1.5) ensure that remaining fixups can be handled by the linker
 716         //       (`lo68' format, extended (postfix) format....)
 717         // (2)   generate the output file image and symbol table;
 718         // (3)   generate relocation information from left-over fixups.
 719         ResolveAllFixups();                                             // Do all fixups
 720         StopMark();                                                             // Stop mark tape-recorder
 721
 722         if (errcnt == 0)
 723         {
 724                 if ((fd = open(objfname, _OPEN_FLAGS, _PERM_MODE)) < 0)
 725                         CantCreateFile(objfname);
 726
 727                 if (verb_flag)
 728                 {
 729                         s = (prg_flag ? "executable" : "object");
 730                         printf("[Writing %s file: %s]\n", s, objfname);
 731                 }
 732
 733                 WriteObject(fd);
 734                 close(fd);
 735
 736                 if (errcnt != 0)
 737                         unlink(objfname);
 738         }
 739
 740         if (list_flag)
 741         {
 742                 if (verb_flag)
 743                         printf("[Wrapping-up listing file]\n");
 744
 745                 listing = 1;
 746                 symtable();
 747                 close(list_fd);
 748         }
 749
 750         if (err_flag)
 751                 close(err_fd);
 752
 753         DEBUG dump_everything();
 754
 755         return errcnt;
 756 }
 757
 758 //
 759 // Determine processor endianess
 760 //
 761 int GetEndianess(void)
 762 {
 763         int i = 1;
 764         char * p = (char *)&i;
 765
 766         if (p[0] == 1)
 767                 return 0;
 768
 769         return 1;
 770 }
 771
 772 //
 773 // Application entry point
 774 //
 775 int main(int argc, char ** argv)
 776 {
 777         perm_verb_flag = 0;                             // Clobber "permanent" verbose flag
 778         legacy_flag = 1;                                // Default is legacy mode on (:-P)
 779         optim_flags[OPT_56K_SHORT] = 1; // This ensures compatibilty with Motorola's 56k assembler
 780
 781         cmdlnexec = argv[0];                    // Obtain executable name
 782         endian = GetEndianess();                // Get processor endianess
 783
 784         // If commands were passed in, process them
 785         if (argc > 1)
 786                 return Process(argc - 1, argv + 1);
 787
 788         DisplayVersion();
 789         DisplayHelp();
 790
 791         return 0;
 792 }