275 lines
5 KiB
C
275 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 1983 by the Vrije Universiteit, Amsterdam, The Netherlands.
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*
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* This product is part of the Amsterdam Compiler Kit.
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*
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* Permission to use, sell, duplicate or disclose this software must be
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* obtained in writing. Requests for such permissions may be sent to
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*
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* Dr. Andrew S. Tanenbaum
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* Wiskundig Seminarium
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* Vrije Universiteit
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* Postbox 7161
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* 1007 MC Amsterdam
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* The Netherlands
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*
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*/
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/*
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* machine dependent back end routines for the Motorola 68000
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*/
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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 == EM_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 == 0)
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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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if (sz != 4)
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fatal("bad icon/ucon size");
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fprintf(codefile,".long %s\n",str);
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}
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con_float() {
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static int been_here;
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if (argval != 4 && argval != 8)
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fatal("bad fcon size");
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fprintf(codefile,".long\t");
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if (argval == 8)
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fprintf(codefile,"F_DUM,");
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fprintf(codefile,"F_DUM\n");
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if ( !been_here++)
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{
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fprintf(stderr,"Warning : dummy float-constant(s)\n");
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}
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}
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#ifdef REGVARS
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regscore(off,size,typ,score,totyp)
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long off;
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{
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if (score == 0) return -1;
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switch(typ) {
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case reg_float:
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return -1;
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case reg_pointer:
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if (size != 4 || totyp != reg_pointer) return -1;
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score *= 2;
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break;
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case reg_loop:
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score += 5;
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/* fall through .. */
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case reg_any:
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if (size != 2 || totyp == reg_pointer) return -1;
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break;
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}
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if (off >= 0) {
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/* parameters must be initialised with an instruction
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* like "move.w 4(a6),d0", which costs 2 words.
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*/
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score -= 2;
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}
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score -= 1; /* take save/restore into account */
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return score;
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}
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struct regsav_t {
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char *rs_reg; /* e.g. "a3" or "d5" */
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long rs_off; /* offset of variable */
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int rs_size; /* 2 or 4 bytes */
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} regsav[9];
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int regnr;
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int nr_a_regs,nr_d_regs;
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int EM_BSIZE;
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static long nlocals;
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prolog(n)
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{ nlocals = n; }
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i_regsave()
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{
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regnr = 0;
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nr_a_regs = 0;
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nr_d_regs = 0;
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EM_BSIZE = 0;
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}
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#define MOVEM_LIMIT 2
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/* If #registers to be saved exceeds MOVEM_LIMIT, we
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* use the movem instruction to save registers; else
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* we simply use several move.l's.
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*/
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save()
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{
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register struct regsav_t *p;
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int i;
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if (regnr > MOVEM_LIMIT) {
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fprintf(codefile,"movem.l ");
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for (p = regsav; ;) {
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fprintf(codefile,"%s",p->rs_reg);
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if (++p == ®sav[regnr]) break;
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putc('/',codefile);
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}
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fprintf(codefile,",-(sp)\n");
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} else {
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/* Note that the order in which the registers are saved
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* is important; it is used by gto.s.
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*/
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for (i = 0; i < nr_a_regs; i++) {
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fprintf(codefile,"move.l a%d,-(sp)\n",5-i);
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}
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for (i = 0; i < nr_d_regs; i++) {
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fprintf(codefile,"move.l d%d,-(sp)\n",7-i);
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}
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}
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/* Push a mask that indicates which registers were saved */
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assert(nr_d_regs < 8 && nr_a_regs < 8);
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if (nr_d_regs == 0 && nr_a_regs == 0) {
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fprintf(codefile,"clr.w -(sp)\n");
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} else {
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fprintf(codefile,"move.w #%d,-(sp)\n",
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nr_d_regs + (nr_a_regs<<3));
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}
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/* Compute AB - LB */
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EM_BSIZE = 4 * (nr_d_regs + nr_a_regs) + 10;
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/* allocate space for local variables */
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fprintf(codefile,"tst.b -%D(sp)\nlink\ta6,#-%D\n",nlocals+40,nlocals);
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/* initialise register-parameters */
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for (p = regsav; p < ®sav[regnr]; p++) {
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if (p->rs_off >= 0) {
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fprintf(codefile,"move.%c %ld(a6),%s\n",
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(p->rs_size == 4 ? 'l' : 'w'),
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p->rs_off + EM_BSIZE,
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p->rs_reg);
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}
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}
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}
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restr()
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{
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register struct regsav_t *p;
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int i;
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fprintf(codefile,"unlk a6\n");
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fprintf(codefile,"add.l #2,sp\n"); /* pop mask */
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if (regnr > MOVEM_LIMIT) {
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fprintf(codefile,"movem.l (sp)+,");
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for (p = regsav; ;) {
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fprintf(codefile,"%s",p->rs_reg);
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if (++p == ®sav[regnr]) break;
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putc('/',codefile);
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}
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putc('\n',codefile);
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} else {
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for (i = nr_d_regs - 1; i >= 0; i--) {
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fprintf(codefile,"move.l (sp)+,d%d\n",7-i);
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}
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for (i = nr_a_regs - 1; i >= 0; i--) {
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fprintf(codefile,"move.l (sp)+,a%d\n",5-i);
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}
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}
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fprintf(codefile,"rts\n");
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}
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f_regsave()
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{
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save();
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}
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regsave(str,off,size)
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char *str;
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long off;
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{
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assert (regnr < 9);
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regsav[regnr].rs_reg = str;
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if (str[0] == 'a') {
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nr_a_regs++;
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} else {
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assert(str[0] == 'd');
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nr_d_regs++;
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}
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regsav[regnr].rs_off = off;
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regsav[regnr++].rs_size = size;
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fprintf(codefile, "!Local %ld into %s\n",off,str);
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}
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regreturn()
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{
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restr();
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}
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#endif
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#ifndef REGVARS
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prolog(nlocals) full nlocals; {
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fprintf(codefile,"tst.b -%D(sp)\nlink\ta6,#-%D\n",nlocals+40,nlocals);
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}
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#endif
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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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fprintf(codefile,".define %s\n",argstr) ;
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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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".text", /* SEGTXT */
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".data", /* SEGCON */
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".data", /* SEGROM */
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".bss" /* SEGBSS */
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};
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