185 lines
3.4 KiB
C
185 lines
3.4 KiB
C
/*
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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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*/
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#ifndef NORCSID
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static char rcs_m[]= "$Header$" ;
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static char rcs_mh[]= ID_MH ;
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#endif
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/*
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* machine dependent back end routines for the Intel 8086
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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 == 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;
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if (sz != 4)
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fatal("bad icon/ucon size");
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l = atol(str);
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fprintf(codefile,"\t.data2 %d,%d\n",
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(int)l&0xFFFF,(int)(l>>16)&0xFFFF);
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}
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#define CODE_GENERATOR
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#define IEEEFLOAT
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#define FL_MSL_AT_LOW_ADDRESS 0
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#define FL_MSW_AT_LOW_ADDRESS 0
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#define FL_MSB_AT_LOW_ADDRESS 0
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#include <con_float>
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/*
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string holstr(n) word n; {
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sprintf(str,hol_off,n,holno);
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return(mystrcpy(str));
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}
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*/
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#ifdef REGVARS
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full lbytes;
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#endif
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prolog(nlocals) full nlocals; {
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fputs("\tpush\tbp\n\tmov\tbp,sp\n", codefile);
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#ifdef REGVARS
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lbytes = nlocals;
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#else
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switch (nlocals) {
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case 4: fputs("\tpush\tax\n", codefile);
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case 2: fputs("\tpush\tax\n", codefile);
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case 0: break;
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default:
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fprintf(codefile, "\tsub\tsp,%d\n",nlocals); break;
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}
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#endif
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}
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#ifdef REGVARS
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long si_off;
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long di_off;
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int firstreg;
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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 (size != 2) return -1;
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score -= 1;
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score += score;
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if (typ == reg_pointer || typ == reg_loop) score += (score >> 2);
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score -= 2; /* cost of saving */
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if (off >= 0) score -= 3;
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return score;
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}
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i_regsave()
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{
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si_off = -1;
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di_off = -1;
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firstreg = 0;
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}
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f_regsave()
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{
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if (di_off == -lbytes) lbytes -= 2;
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if (si_off == -lbytes) lbytes -= 2;
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if (di_off == -lbytes) lbytes -= 2;
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switch (lbytes) {
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case 4: fputs("\tpush\tax\n", codefile);
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case 2: fputs("\tpush\tax\n", codefile);
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case 0: break;
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default:
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fprintf(codefile, "\tsub\tsp,%d\n",lbytes); break;
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}
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if (firstreg == 1) {
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fputs("push di\n", codefile);
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if (si_off != -1) fputs("push si\n", codefile);
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}
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else if (firstreg == -1) {
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fputs("push si\n", codefile);
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if (di_off != -1) fputs("push di\n", codefile);
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}
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if (di_off >= 0)
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fprintf(codefile, "mov di,%ld(bp)\n", di_off);
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if (si_off >= 0)
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fprintf(codefile, "mov si,%ld(bp)\n", si_off);
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}
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regsave(regstr, off, size)
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char *regstr;
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long off;
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{
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if (strcmp(regstr, "si") == 0) {
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if (! firstreg) firstreg = -1;
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si_off = off;
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}
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else {
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if (! firstreg) firstreg = 1;
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di_off = off;
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}
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}
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regreturn()
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{
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if (firstreg == 1) {
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if (si_off != -1) fputs("jmp .sdret\n", codefile);
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else fputs("jmp .dret\n", codefile);
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}
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else if (firstreg == -1) {
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if (di_off != -1) fputs("jmp .dsret\n", codefile);
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else fputs("jmp .sret\n", codefile);
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}
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else fputs("jmp .cret\n", codefile);
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}
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#endif REGVARS
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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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".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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};
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