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as.c
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C/C++ Source or Header
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1990-07-14
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6KB
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271 lines
char mapdn();
char *alloc();
/*
* as --- cross assembler main program
*/
main(argc,argv)
int argc;
char **argv;
{
char **np;
char *i;
FILE *fopen();
int j = 0;
if(argc < 2){
printf("Usage: %s [files] [- options]\n",argv[j]);
printf("Example: %s FILE1.ASM FILE2.ASM - CRE L\n",argv[j]);
exit(1);
}
Argv = argv;
initialize();
while ((*argv[j] != '-') && (j<argc))
j++;
N_files = j-1;
if (j < argc )
{
argv[j]++;
while (j<argc)
{
for (i = argv[j]; *i != 0; i++)
if ((*i <= 'Z') && (*i >= 'A'))
*i = *i + 32;
if (strcmp(argv[j],"l")==0)
Lflag = 1;
else if (strcmp(argv[j],"nol")==0)
Lflag = 0;
else if (strcmp(argv[j],"c")==0)
Cflag = 1;
else if (strcmp(argv[j],"noc")==0)
Cflag = 0;
else if (strcmp(argv[j],"s")==0)
Sflag = 1;
else if (strcmp(argv[j],"cre")==0)
CREflag = 1;
else if ( *argv[j] ) {
printf("\nUnrecognized option on command line\n");
printf("Valid options are:\n");
fatal(" l nol c noc s cre\n\n");
}
j++;
}
}
root = NULL;
Cfn = 0;
np = argv;
Line_num = 0; /* reset cumulative line number */
while( ++Cfn <= N_files )
{
if((Fd = fopen(*++np,"r")) == NULL)
printf("as: can't open %s\n",*np);
else{
Cf_line_num = 0; /* reset current file line number */
End = NO; /* no END directive yet */
make_pass();
fclose(Fd);
}
}
if( Err_count == 0 ){
Pass++;
re_init();
Cfn = 0;
np = argv;
Line_num = 0;
while( ++Cfn <= N_files)
{
if((Fd = fopen(*++np,"r")) != NULL)
{
printf( "\n Assembling %s\n", *np );
Cf_line_num = 0;
End = NO;
make_pass();
fclose(Fd);
}
}
f_S9(); /* output closing record */
if( Cflag ) /* if still counting cycles, then */
print_cycles(); /* print cycles counted */
if (Sflag == 1)
{
printf ("\f");
stable (root);
}
if (CREflag == 1)
{
printf ("\f");
cross (root);
}
}
printf("\n\nNumber of errors %d\n",Err_count);
printf("Number of warnings %d\n",Warn_count);
fwd_done();
exit(Err_count);
}
initialize()
{
FILE *fopen();
char c;
int i = 0;
#ifdef DEBUG
printf("Initializing\n");
#endif
Err_count = 0;
Warn_count = 0;
Pc = 0;
E_pc = 0;
Pass = 1;
Ctotal = 0;
N_page = 0;
Cpflag = 0;
Entry_set = NO;
Entry_pt = 0;
do { /* copy first file name into Obj_name */
c = Obj_name[i] = Argv[1][i];
i++;
} while( c && ( c != '.' ) && ( i < FILENAME_MAX ) );
Obj_name[--i] = EOS;
if( i >= ( FILENAME_MAX - 4 ) )
fatal("First file name too long");
strcat(Obj_name,".s19"); /* append .s19 to file name. */
if( (Objfil = fopen(Obj_name,"w")) == NULL)
fatal("Can't create object file");
fwdinit(); /* forward ref init */
localinit(); /* target machine specific init. */
}
re_init()
{
#ifdef DEBUG
printf("Reinitializing\n");
#endif
Err_count = 0;
Warn_count = 0;
Pc = 0;
E_pc = 0;
E_total = 0;
P_total = 0;
Ctotal = 0;
N_page = 0;
Cpflag = 0;
Entry_set = NO;
Entry_pt = 0;
fwdreinit();
}
make_pass()
{
char *p;
char *limit = Line+MAXBUF-1;
char *fgets();
#ifdef DEBUG
printf("Pass %d\n",Pass);
#endif
while( fgets(Line,MAXBUF,Fd) != (char *)NULL ){
for( p=Line; p<limit; p++ ) { /* strip newline */
if( *p == NEWLINE ) {
*p = EOS;
break;
}
}
Line_num++;
Cf_line_num++;
P_force = 0; /* No force unless bytes emitted */
N_page = 0;
if(parse_line())
process();
if(Pass == 2 && Lflag && !N_page)
print_line();
if( Cpflag == 3 ) /* print cumulative cycles */
print_cycles();
P_total = 0; /* reset byte count, */
Cpflag = 0; /* cycle print flag, */
Cycles = 0; /* and per instruction cycle count */
if( End ) break;
}
f_record();
}
/*
* parse_line --- split input line into label, op and operand
*/
parse_line()
{
register char *ptrfrm = Line;
register char *ptrto = Label;
char *limit = Label+MAXLAB-1;
char *skip_white();
if((*ptrfrm == '*') || (*ptrfrm == EOS) || (*ptrfrm == ';'))
return(0); /* a comment line */
while( (delim(*ptrfrm)== NO) && (ptrto < limit) )
*ptrto++ = *ptrfrm++;
if( *ptrfrm == ':' ) ptrfrm++; /* allow one over limit for : */
if( delim(*ptrfrm) == NO ) {
while( delim(*ptrfrm) == NO )ptrfrm++;
warn("Label too long");
}
if(*--ptrto != ':')ptrto++; /* ignore trailing : */
*ptrto = EOS;
ptrfrm = skip_white(ptrfrm);
ptrto = Op;
limit = Op+MAXOP-1;
while( (delim(*ptrfrm) == NO) && (ptrto < limit) )
*ptrto++ = mapdn(*ptrfrm++);
if( delim(*ptrfrm) == NO ) {
while( delim(*ptrfrm) == NO ) ptrfrm++;
error("Mnemonic/Directive too long");
}
*ptrto = EOS;
ptrfrm = skip_white(ptrfrm);
ptrto = Operand;
while( (*ptrfrm != EOS) )
*ptrto++ = *ptrfrm++;
*ptrto = EOS;
#ifdef DEBUG
printf("Label-%s-\n",Label);
printf("Op----%s-\n",Op);
printf("Operand-%s-\n",Operand);
#endif
return(1);
}
/*
* process --- determine mnemonic class and act on it
*/
process()
{
register struct oper *i;
struct oper *mne_look();
Old_pc = Pc; /* setup `old' program counter */
Optr = Operand; /* point to beginning of operand field */
if(*Op==EOS){ /* no mnemonic */
if( *Label ) install(Label,Pc);
}
else if( (i = mne_look(Op))== NULL) {
if( *Label ) install(Label,Pc);
error("Unrecognized Mnemonic");
}
else if( i->class == PSEUDO )
do_pseudo(i->opcode);
else{
if( *Label ) install(Label,Pc);
if(Cflag)Cycles = i->cycles;
do_op(i->opcode,i->class);
if(Cflag)Ctotal += Cycles;
}
}