As left by Hans v. Staveren.

mach/pdp/ncg/mach.c

@@ -0,0 +1,205 @@
+#ifndef NORCSID
+static char rcsid[] = "$Header$";
+#endif
+
+/*
+ * (c) copyright 1983 by the Vrije Universiteit, Amsterdam, The Netherlands.
+ *
+ *          This product is part of the Amsterdam Compiler Kit.
+ *
+ * Permission to use, sell, duplicate or disclose this software must be
+ * obtained in writing. Requests for such permissions may be sent to
+ *
+ *      Dr. Andrew S. Tanenbaum
+ *      Wiskundig Seminarium
+ *      Vrije Universiteit
+ *      Postbox 7161
+ *      1007 MC Amsterdam
+ *      The Netherlands
+ *
+ * Author: Hans van Staveren
+ */
+
+/*
+ * machine dependent back end routines for the PDP-11
+ */
+
+con_part(sz,w) register sz; word w; {
+
+	while (part_size % sz)
+		part_size++;
+	if (part_size == 2)
+		part_flush();
+	if (sz == 1) {
+		w &= 0xFF;
+		if (part_size)
+			w <<= 8;
+		part_word |= w;
+	} else {
+		assert(sz == 2);
+		part_word = w;
+	}
+	part_size += sz;
+}
+
+con_mult(sz) word sz; {
+	long l;
+
+	if (sz != 4)
+		fatal("bad icon/ucon size");
+	l = atol(str);
+	fprintf(codefile,"\t%o;%o\n",(int)(l>>16),(int)l);
+}
+
+con_float() {
+	double f;
+	register short *p,i;
+
+	/*
+	 * This code is correct only when the code generator is
+	 * run on a PDP-11 or VAX-11 since it assumes native
+	 * floating point format is PDP-11 format.
+	 */
+
+	if (argval != 4 && argval != 8)
+		fatal("bad fcon size");
+	f = atof(str);
+	p = (short *) &f;
+	i = *p++;
+	if (argval == 8) {
+		fprintf(codefile,"\t%o;%o;",i,*p++);
+		i = *p++;
+	}
+	fprintf(codefile,"\t%o;%o\n",i,*p++);
+}
+
+#ifdef REGVARS
+
+char Rstring[10];
+full lbytes;
+struct regadm {
+	char *ra_str;
+	long  ra_off;
+} regadm[2];
+int n_regvars;
+
+regscore(off,size,typ,score,totyp) long off; {
+
+	/*
+	 * This function is full of magic constants.
+	 * They are a result of experimentation.
+	 */
+
+	if (size != 2)
+		return(-1);
+	score -= 1;	/* allow for save/restore */
+	if (off>=0)
+		score -= 2;
+	if (typ==reg_pointer)
+		score *= 17;
+	else if (typ==reg_loop)
+		score = 10*score+50;	/* Guestimate */
+	else
+		score *= 10;
+	return(score);	/* 10 * estimated # of words of profit */
+}
+
+i_regsave() {
+
+	Rstring[0] = 0;
+	n_regvars=0;
+}
+
+f_regsave() {
+	register i;
+
+	if (n_regvars==0 || lbytes==0) {
+		fprintf(codefile,"mov r5,-(sp)\nmov sp,r5\n");
+		if (lbytes == 2)
+			fprintf(codefile,"tst -(sp)\n");
+		else if (lbytes!=0)
+			fprintf(codefile,"sub $0%o,sp\n",lbytes);
+		for (i=0;i<n_regvars;i++)
+			fprintf(codefile,"mov %s,-(sp)\n",regadm[i].ra_str);
+	} else {
+		if (lbytes>6) {
+			fprintf(codefile,"mov $0%o,r0\n",lbytes);
+			fprintf(codefile,"jsr r5,PR%s\n",Rstring);
+		} else {
+			fprintf(codefile,"jsr r5,PR%d%s\n",lbytes,Rstring);
+		}
+	}
+	for (i=0;i<n_regvars;i++)
+		if (regadm[i].ra_off>=0)
+			fprintf(codefile,"mov 0%lo(r5),%s\n",regadm[i].ra_off,
+						regadm[i].ra_str);
+}
+
+regsave(regstr,off,size) char *regstr; long off; {
+
+	fprintf(codefile,"/ Local %ld into %s\n",off,regstr);
+	strcat(Rstring,regstr);
+	regadm[n_regvars].ra_str = regstr;
+	regadm[n_regvars].ra_off = off;
+	n_regvars++;
+}
+
+regreturn() {
+
+	fprintf(codefile,"jmp RT%s\n",Rstring);
+}
+
+#endif
+
+prolog(nlocals) full nlocals; {
+
+#ifndef REGVARS
+	fprintf(codefile,"mov r5,-(sp)\nmov sp,r5\n");
+	if (nlocals == 0)
+		return;
+	if (nlocals == 2)
+		fprintf(codefile,"tst -(sp)\n");
+	else
+		fprintf(codefile,"sub $0%o,sp\n",nlocals);
+#else
+	lbytes = nlocals;
+#endif
+}
+
+dlbdlb(as,ls) string as,ls; {
+
+	if (strlen(as)+strlen(ls)+2<sizeof(labstr)) {
+		strcat(ls,":");
+		strcat(ls,as);
+	} else
+		fatal("too many consecutive labels");
+}
+
+mes(type) word type; {
+	int argt ;
+
+	switch ( (int)type ) {
+	case ms_ext :
+		for (;;) {
+			switch ( argt=getarg(
+			    ptyp(sp_cend)|ptyp(sp_pnam)|sym_ptyp) ) {
+			case sp_cend :
+				return ;
+			default:
+				strarg(argt) ;
+				fprintf(codefile,".globl %s\n",argstr) ;
+				break ;
+			}
+		}
+	default :
+		while ( getarg(any_ptyp) != sp_cend ) ;
+		break ;
+	}
+}
+
+char    *segname[] = {
+	".text",        /* SEGTXT */
+	".data",        /* SEGCON */
+	".data",        /* SEGROM */
+	".bss"          /* SEGBSS */
+};

mach/pdp/ncg/mach.h

@@ -0,0 +1,24 @@
+/* $Header$ */
+
+#define ex_ap(y)	fprintf(codefile,".globl %s\n",y)
+#define in_ap(y)	/* nothing */
+
+#define newplb(x)	fprintf(codefile,"%s:\n",x)
+#define newilb(x)	fprintf(codefile,"%s:\n",x)
+#define newdlb(x)	fprintf(codefile,"%s:\n",x)
+#define newlbss(l,x)	fprintf(codefile,"%s:.=.+0%o\n",l,x);
+
+#define cst_fmt		"$0%o"
+#define off_fmt		"0%o"
+#define ilb_fmt		"I%03x%x"
+#define dlb_fmt		"_%d"
+#define	hol_fmt		"hol%d"
+
+#define hol_off		"0%o+hol%d"
+
+#define con_cst(x)	fprintf(codefile,"0%o\n",x)
+#define con_ilb(x)	fprintf(codefile,"%s\n",x)
+#define con_dlb(x)	fprintf(codefile,"%s\n",x)
+
+#define id_first	'_'
+#define BSS_INIT	0