209 lines
4 KiB
C
209 lines
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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* 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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void con_part(register int sz, word w)
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{
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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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void con_mult(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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#ifdef ACK_ASS
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fprintf(codefile,".data2 0%o, 0%o !%s\n",(int)(l>>16),(int)l, str);
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#else
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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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#define PDPFLOAT
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#define FL_MSL_AT_LOW_ADDRESS 1
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#define FL_MSW_AT_LOW_ADDRESS 1
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#define FL_MSB_AT_LOW_ADDRESS 0
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#define CODE_GENERATOR
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#include <con_float>
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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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int regscore(long off,int size,int typ,int score,int totyp)
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{
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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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void i_regsave(void) {
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Rstring[0] = 0;
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n_regvars=0;
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}
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void f_regsave(void) {
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register int 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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void regsave(char *regstr,long off,int size)
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{
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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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void regreturn(void) {
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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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void prolog(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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void dlbdlb(string as,string ls)
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{
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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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void mes(word type)
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{
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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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