266 lines
5 KiB
C
266 lines
5 KiB
C
#ifndef NORCSID
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static char rcsid[] = "$Header$";
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#endif
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/*
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* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
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* See the copyright notice in the ACK home directory, in the file "Copyright".
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*
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* Author: Hans van Staveren
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*/
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/*
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* machine dependent back end routines for the PDP-11
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*/
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/* #define REGPATCH /* save all registers in markblock */
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con_part(sz,w) register sz; word w; {
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while (part_size % sz)
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part_size++;
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if (part_size == TEM_WSIZE)
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part_flush();
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if (sz == 1) {
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w &= 0xFF;
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if (part_size)
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w <<= 8;
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part_word |= w;
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} else {
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assert(sz == 2);
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part_word = w;
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}
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part_size += sz;
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}
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con_mult(sz) word sz; {
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long l, atol();
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if (sz != 4)
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fatal("bad icon/ucon size");
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#ifdef ACK_ASS
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fprintf(codefile,".data4 %s\n",str);
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#else
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l = atol(str);
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fprintf(codefile,"\t%o;%o\n",(int)(l>>16),(int)l);
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#endif
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}
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/*
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* The next function is difficult to do when not running on a PDP 11 or VAX
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* The strategy followed is to assume the code generator is running on a PDP 11
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* unless the ACK_ASS define is on.
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*/
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con_float() {
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#ifdef ACK_ASS
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double f, f1;
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double atof(), frexp(), modf();
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int i, j;
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int sign = 0;
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int fraction ;
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if (argval != 4 && argval != 8)
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fatal("bad fcon size");
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f = atof(str);
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f = frexp(f, &i);
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if (f < 0) {
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f = -f;
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sign = 1;
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}
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while (f < 0.5) {
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f += f;
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i --;
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}
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f = modf(2 * f, &f1); /* hidden bit */
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i = (i + 128) & 0377;
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fraction = (sign << 15) | (i << 7);
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for (j = 6; j>= 0; j--) {
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if (f >= 0.5) fraction |= (1 << j);
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f = modf(2*f, &f1);
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}
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fprintf(codefile, ".data2 0%o", fraction);
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for (i = argval / 2 - 1; i; i--) {
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fraction = 0;
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for (j = 15; j>= 0; j--) {
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if (f >= 0.5) fraction |= (1 << j);
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f = modf(2*f, &f1);
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}
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fprintf(codefile, ", 0%o", fraction);
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}
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putc('\n', codefile);
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#else
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double f;
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double atof();
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int i;
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short *p;
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if (argval != 4 && argval != 8)
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fatal("bad fcon size");
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f = atof(str);
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p = (short *) &f;
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i = *p++;
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if (argval == 8) {
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fprintf(codefile,"\t%o;%o;",i,*p++);
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i = *p++;
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}
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fprintf(codefile,"\t%o;%o\n",i,*p++);
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#endif
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}
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#ifdef REGVARS
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char Rstring[10];
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full lbytes;
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struct regadm {
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char *ra_str;
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long ra_off;
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} regadm[2];
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int n_regvars;
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regscore(off,size,typ,score,totyp) long off; {
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if (size != 2)
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return(-1);
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score -= 1; /* allow for save/restore */
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if (off>=0)
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score -= 2;
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if (typ==reg_pointer)
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score *= 17;
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else if (typ==reg_loop)
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score = 10*score+50; /* Guestimate */
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else
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score *= 10;
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return(score); /* estimated # of words of profit */
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}
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i_regsave() {
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Rstring[0] = 0;
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n_regvars=0;
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}
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f_regsave() {
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register i;
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if (n_regvars==0 || lbytes==0) {
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#ifdef REGPATCH
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fprintf(codefile,"mov r2,-(sp)\nmov r4,-(sp)\n");
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#endif
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fprintf(codefile,"mov r5,-(sp)\nmov sp,r5\n");
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if (lbytes == 2)
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fprintf(codefile,"tst -(sp)\n");
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else if (lbytes!=0)
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fprintf(codefile,"sub $0%o,sp\n",lbytes);
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for (i=0;i<n_regvars;i++)
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fprintf(codefile,"mov %s,-(sp)\n",regadm[i].ra_str);
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} else {
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if (lbytes>6) {
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fprintf(codefile,"mov $0%o,r0\n",lbytes);
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fprintf(codefile,"jsr r5,PR%s\n",Rstring);
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} else {
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fprintf(codefile,"jsr r5,PR%d%s\n",lbytes,Rstring);
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}
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}
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for (i=0;i<n_regvars;i++)
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if (regadm[i].ra_off>=0)
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fprintf(codefile,"mov 0%lo(r5),%s\n",regadm[i].ra_off,
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regadm[i].ra_str);
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}
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regsave(regstr,off,size) char *regstr; long off; {
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fprintf(codefile,"%c Local %ld into %s\n",COMMENTCHAR,off,regstr);
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/* commented away
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#ifndef REGPATCH
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fprintf(codefile,"mov %s,-(sp)\n",regstr);
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#endif
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strcat(Rstring,regstr);
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if (off>=0)
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fprintf(codefile,"mov 0%lo(r5),%s\n",off,regstr);
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end of commented away */
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strcat(Rstring,regstr);
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regadm[n_regvars].ra_str = regstr;
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regadm[n_regvars].ra_off = off;
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n_regvars++;
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}
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regreturn() {
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#ifdef REGPATCH
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fprintf(codefile,"jmp eret\n");
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#else
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fprintf(codefile,"jmp RT%s\n",Rstring);
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#endif
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}
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#endif
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prolog(nlocals) full nlocals; {
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#ifndef REGVARS
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#ifdef REGPATCH
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fprintf(codefile,"mov r2,-(sp)\nmov r4,-(sp)\n");
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#endif
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fprintf(codefile,"mov r5,-(sp)\nmov sp,r5\n");
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if (nlocals == 0)
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return;
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if (nlocals == 2)
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fprintf(codefile,"tst -(sp)\n");
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else
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fprintf(codefile,"sub $0%o,sp\n",nlocals);
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#else
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lbytes = nlocals;
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#endif
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}
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dlbdlb(as,ls) string as,ls; {
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if (strlen(as)+strlen(ls)+2<sizeof(labstr)) {
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strcat(ls,":");
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strcat(ls,as);
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} else
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fatal("too many consecutive labels");
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}
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mes(type) word type; {
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int argt ;
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switch ( (int)type ) {
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case ms_ext :
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for (;;) {
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switch ( argt=getarg(
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ptyp(sp_cend)|ptyp(sp_pnam)|sym_ptyp) ) {
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case sp_cend :
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return ;
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default:
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strarg(argt) ;
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#ifdef ACK_ASS
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fprintf(codefile,".define %s\n",argstr) ;
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#else
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fprintf(codefile,".globl %s\n",argstr) ;
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#endif
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break ;
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}
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}
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default :
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while ( getarg(any_ptyp) != sp_cend ) ;
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break ;
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}
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}
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char *segname[] = {
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#ifdef ACK_ASS
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".sect .text", /* SEGTXT */
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".sect .data", /* SEGCON */
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".sect .rom", /* SEGROM */
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".sect .bss" /* SEGBSS */
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#else
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".text", /* SEGTXT */
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".data", /* SEGCON */
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".data", /* SEGROM */
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".bss" /* SEGBSS */
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#endif
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};
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