221 lines
4.2 KiB
C
221 lines
4.2 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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#include <stb.h>
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/*
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* machine dependent back end routines for the Intel 80386
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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 || sz == 2) {
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w &= (sz == 1 ? 0xFF : 0xFFFF);
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w <<= 8 * part_size;
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part_word |= w;
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} else {
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assert(sz == 4);
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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.data4 %ld\n", l);
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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("push ebp\nmov ebp,esp\n", codefile);
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#ifdef REGVARS
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lbytes = nlocals;
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#else
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#ifdef NOTDEF
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probably not better on 386.
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switch(nlocals) {
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case 8:
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fputs("push eax\n", codefile);
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/* fall through */
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case 4:
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fputs("push eax\n", codefile);
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break;
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default:
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#endif
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fprintf(codefile, "\tsub\tesp,%ld\n",nlocals);
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#ifdef NOTDEF
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break;
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}
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#endif
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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 != 4) 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 (si_off == -lbytes) lbytes -= 4;
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if (di_off == -lbytes) lbytes -= 4;
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if (si_off == -lbytes) lbytes -= 4;
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if (lbytes) fprintf(codefile, "\tsub\tesp,%ld\n",(long) lbytes);
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if (firstreg == 1) {
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fputs("push edi\n", codefile);
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if (si_off != -1) fputs("push esi\n", codefile);
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}
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else if (firstreg == -1) {
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fputs("push esi\n", codefile);
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if (di_off != -1) fputs("push edi\n", codefile);
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}
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if (si_off >= 0)
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fprintf(codefile, "mov esi,%ld(ebp)\n", si_off);
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if (di_off >= 0)
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fprintf(codefile, "mov edi,%ld(ebp)\n", di_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, "esi") == 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("pop esi\n", codefile);
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fputs("pop edi\n", codefile);
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}
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else if (firstreg == -1) {
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if (di_off != -1) fputs("pop edi\n", codefile);
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fputs("pop esi\n", codefile);
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}
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fputs("leave\nret\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, a1, a2 ;
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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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case ms_stb:
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argt = getarg(str_ptyp | cst_ptyp);
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if (argt == sp_cstx)
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fputs(".symb \"\", ", codefile);
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else {
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fprintf(codefile, ".symb \"%s\", ", str);
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argt = getarg(cst_ptyp);
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}
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a1 = argval;
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argt = getarg(cst_ptyp);
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a2 = argval;
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argt = getarg(cst_ptyp|nof_ptyp|sof_ptyp|ilb_ptyp|pro_ptyp);
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fprintf(codefile, "%s, 0x%x, %d\n", strarg(argt), a1, a2);
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argt = getarg(end_ptyp);
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break;
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case ms_std:
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argt = getarg(str_ptyp | cst_ptyp);
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if (argt == sp_cstx)
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str[0] = '\0';
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else {
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argt = getarg(cst_ptyp);
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}
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swtxt();
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if (argval == N_SLINE) {
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fputs("call ___u_LiB\n", codefile);
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cleanregs(); /* debugger might change variables */
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}
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fprintf(codefile, ".symd \"%s\", 0x%x,", str, (int) argval);
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argt = getarg(cst_ptyp);
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fprintf(codefile, "%d\n", (int) argval);
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argt = getarg(end_ptyp);
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break;
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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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