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davidgb |
char mapdn();
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char *alloc();
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/*
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* as --- cross assembler main program
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Note: Compile with define DEBUG for function module debug
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statements. Compile with define DEBUG2 for version 2 debug
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statements only. Compile with define IBM to use original, non-
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Amiga, non-MAC, non-UNIX fgets() function. Amiga version will
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accept IBM generated source code but not the other way around.
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Note added version (TER) 2.01 19 June 1989.
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Additional modifications to cleanup output listing made by
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Donald W. Coates 1/5/92. Version changed to 2.10
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*/
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main(argc,argv)
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int argc;
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char **argv;
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{
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char **np;
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char *i;
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FILE *fopen();
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int j = 0;
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void do_op(),f_record(); /* added for ANSI C compat ver TER_2.0 6/18/89 */
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printf("Assembler release DWC_2.0 version 2.11\n");
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printf("May 6, 2004 (c) Motorola (free ware)\n");
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if(argc < 2){
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printf("Usage: %s [files]\n",argv[j]);
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exit(1);
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}
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Argv = argv;
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initialize();
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while ((j<argc) && (*argv[j] != '-'))
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j++;
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N_files = j-1;
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if (j < argc )
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{
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argv[j]++;
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while (j<argc)
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{
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for (i = argv[j]; *i != 0; i++)
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if ((*i <= 'Z') && (*i >= 'A'))
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*i = *i + 32;
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if (strcmp(argv[j],"l")==0)
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Lflag = 1;
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else if (strcmp(argv[j],"nol")==0)
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Lflag = 0;
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else if (strcmp(argv[j],"c")==0)
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Cflag = 1;
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else if (strcmp(argv[j],"noc")==0)
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Cflag = 0;
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else if (strcmp(argv[j],"s")==0)
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Sflag = 1;
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else if (strcmp(argv[j],"cre")==0)
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CREflag = 1;
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else if (strcmp(argv[j],"crlf")==0) /* test for crlf option */
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CRflag = 1; /* add <CR><LF> to S record */
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/* ver TER_1.1 June 3, 1989 */
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else if (strcmp(argv[j],"nnf")==0) /* test for nnf option */
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nfFlag=0; /* nfFlag=1 means number INCLUDE */
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/* separately. ver TER_2.0 6/17/89 */
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else if (strcmp(argv[j],"p50")==0){ /* page every 50 lines */
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Pflag50 = 1; /* ver (TER) 2.01 19 Jun 89 */
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Pflag75 = 0;
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} /* separately. ver TER_2.0 6/17/89 */
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else if (strcmp(argv[j],"p75")==0){ /* page every 75 lines */
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Pflag50 = 0; /* ver (DWC) 2.10 8 Oct 2001 */
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Pflag75 = 1;
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}
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j++;
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}
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}
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root = NULL;
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Cfn = 0;
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np = argv;
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Line_num = 0; /* reset line number */
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while( ++Cfn <= N_files )
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if((Fd = fopen(*++np,"r")) == NULL)
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printf("as: can't open %s\n",*np);
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else{
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make_pass();
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fclose(Fd);
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}
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if( Err_count == 0 ){
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Pass++;
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re_init();
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Cfn = 0;
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np = argv;
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Line_num = 0;
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FdCount=0; /* Resets INCLUDE file nesting ver TER_2.0 6/17/89 */
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while( ++Cfn <= N_files)
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if((Fd = fopen(*++np,"r")) != NULL)
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{
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make_pass();
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fclose(Fd);
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}
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printf ("Program + Init Data = %d bytes\n",F_total); /* print total bytes */
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printf ("Error count = %d\n",Err_count); /* rel TER_2.0 */
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if (Sflag == 1)
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{
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printf ("\n\f\n");
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stable (root);
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}
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if (CREflag == 1)
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{
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printf ("\n\f\n");
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cross (root);
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}
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if (CRflag == 1)
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fprintf(Objfil,"S9030000FC%c\n",CR); /* ver TER_1.1 print w <CR> */
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else
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fprintf(Objfil,"S9030000FC\n"); /* at least give a decent ending */
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fclose(Objfil); /* close file correctly ver TER_1.1 */
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}
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else /* just note errors, TER_2.0 */
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{
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printf ("Program + Init Data = %d bytes\n",F_total); /* print total bytes */
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printf ("Error count = %d\n",Err_count);
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}
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fwd_done();
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exit(Err_count); /* neat for UNIX cuz can test return value in script
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but on other systems like Amiga, mostly just makes
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further script statements fail if >10, else
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nothing. Therefore, printed out byte count
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and error level. ver (TER) 2.02 19 Jun 89 */
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}
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initialize()
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{
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FILE *fopen();
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int i = 0;
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#ifdef DEBUG
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printf("Initializing\n");
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#endif
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Err_count = 0;
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Pc = 0;
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Pass = 1;
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Lflag = 0;
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Cflag = 0;
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Ctotal = 0;
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Sflag = 0;
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CREflag = 0;
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N_page = 0;
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Line[MAXBUF-1] = NEWLINE;
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strcpy(Obj_name,Argv[1]); /* copy first file name into array */
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do {
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if (Obj_name[i]=='.')
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Obj_name[i]=0;
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}
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while (Obj_name[i++] != 0);
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strcat(Obj_name,".s19"); /* append .out to file name. */
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if( (Objfil = fopen(Obj_name,"w")) == NULL)
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fatal("Can't create object file");
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fwdinit(); /* forward ref init */
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localinit(); /* target machine specific init. */
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}
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re_init()
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{
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#ifdef DEBUG
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printf("Reinitializing\n");
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#endif
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Pc = 0;
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E_total = 0;
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P_total = 0;
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Ctotal = 0;
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N_page = 0;
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fwdreinit();
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}
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make_pass()
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{
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#ifdef IBM
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char *fgets(); /* the original line */
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#else
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char *FGETS(); /* use own FGETS which is rewrite of lib function */
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/* such that it discards <CR> so can read code */
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/* generated on IBM */
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/* June 3, 1989 rev TER_1.1 */
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#endif
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#ifdef DEBUG
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printf("Pass %d\n",Pass);
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#endif
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#ifndef IBM
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while( FGETS(Line,MAXBUF-1,Fd) != (char *)NULL ){ /* changed to FGETS */
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/* which does not pass on <CR> June 3, 1989 */
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/* rev TER_1.1 */
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#else
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while( fgets(Line,MAXBUF,Fd) != (char *)NULL ){
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#endif
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Line_num++;
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P_force = 0; /* No force unless bytes emitted */
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N_page = 0;
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if(parse_line())
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process();
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if(Pass == 2 && Lflag && !N_page)
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print_line();
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P_total = 0; /* reset byte count */
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Cycles = 0; /* and per instruction cycle count */
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}
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f_record();
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}
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/*
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* parse_line --- split input line into label, op and operand
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*/
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parse_line()
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{
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register char *ptrfrm = Line;
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register char *ptrto = Label;
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char *skip_white();
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if( *ptrfrm == '*' || *ptrfrm == '\n' || *ptrfrm == ';' )
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/* added check for ';' ver TER_1.1 */
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/* June 3, 1989 */
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return(0); /* a comment line */
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while( delim(*ptrfrm)== NO ) /* parsing Label */
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*ptrto++ = *ptrfrm++;
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if(*--ptrto != ':')ptrto++; /* allow trailing : */
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*ptrto = EOS;
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ptrfrm = skip_white(ptrfrm);
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if (*ptrfrm == ';') { /* intercept comment after label, ver TER_2.0 */
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*Op = *Operand = EOS; /* comment, no Opcode or Operand */
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return(1); }
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ptrto = Op;
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while( delim(*ptrfrm) == NO) /* parsing Opcode */
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*ptrto++ = mapdn(*ptrfrm++);
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*ptrto = EOS;
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ptrfrm = skip_white(ptrfrm);
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if (*ptrfrm == ';') { /* intercept comment, ver TER_2.0 */
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*Operand = EOS; /* comment, no Operand */
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return(1); }
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ptrto = Operand;
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while( (*ptrfrm != NEWLINE) && (*ptrfrm != ';')) /* ver TER_2.0 */
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*ptrto++ = *ptrfrm++; /* kill comments */
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*ptrto = EOS;
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#ifdef DEBUG
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printf("Label-%s-\n",Label);
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printf("Op----%s-\n",Op);
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printf("Operand-%s-\n",Operand);
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#endif
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return(1);
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}
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| 261 |
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/*
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* process --- determine mnemonic class and act on it
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*/
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| 264 |
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process()
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| 265 |
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{
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register struct oper *i;
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struct oper *mne_look();
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Old_pc = Pc; /* setup `old' program counter */
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Optr = Operand; /* point to beginning of operand field */
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if(*Op==EOS){ /* no mnemonic */
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if(*Label != EOS)
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install(Label,Pc);
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}
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else if( (i = mne_look(Op))== NULL)
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error("Unrecognized Mnemonic");
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else if( i->class == PSEUDO )
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do_pseudo(i->opcode);
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else{
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if( *Label )install(Label,Pc);
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| 282 |
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if(Cflag)Cycles = i->cycles;
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| 283 |
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do_op(i->opcode,i->class);
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| 284 |
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if(Cflag)Ctotal += Cycles;
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| 285 |
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}
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| 286 |
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}
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| 287 |
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| 288 |
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#ifndef IBM
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| 289 |
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char *FGETS(s, n, iop) /* get at most n chars from iop */
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| 290 |
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/* Added rev TER_1.1 June 3, 1989 */
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| 291 |
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/* Adapted from Kernighan & Ritchie */
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| 292 |
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/* An fgets() that is IBM proof. Not needed if
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| 293 |
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this IS an IBM */
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| 294 |
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| 295 |
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char *s;
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| 296 |
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int n;
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| 297 |
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register FILE *iop;
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| 298 |
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{
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| 299 |
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register int c;
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| 300 |
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register char *cs;
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| 301 |
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| 302 |
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cs=s;
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| 303 |
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while (--n > 0 && (c = getc(iop)) != EOF) /* read chars if not file end */
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| 304 |
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{
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| 305 |
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if ((*cs = c) != CR) cs++; /* incr buffer pointer if not CR */
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| 306 |
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/* If CR, leave to be written over */
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| 307 |
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if (c == '\n')
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| 308 |
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break;
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| 309 |
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}
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| 310 |
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*cs = '\0'; /* replace NEWLINE with NULL as in standard fgets() */
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| 311 |
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return((c == EOF && cs == s) ? NULL : s); /* return NULL if this is EOF */
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| 312 |
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}
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| 313 |
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#endif
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