350 lines
6.2 KiB
C
350 lines
6.2 KiB
C
/* $Header$ */
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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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*/
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/*
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* machine dependent back end routines for the Motorola 68000, 68010 or 68020
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*/
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#include "whichone.h"
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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 == 4)
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part_flush();
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if (sz == 1) {
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w &= 0xFF;
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w <<= 8*(3-part_size);
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part_word |= w;
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} else if (sz == 2) {
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w &= 0xFFFF;
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if (part_size == 0)
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w <<= 16;
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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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if (sz != 4)
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fatal("bad icon/ucon size");
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fprintf(codefile,".data4 %s\n",str);
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}
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#ifdef NOFLOAT
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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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fputs(".data4\t", codefile);
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if (argval == 8)
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fputs("0,", codefile);
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fputs("0 !dummy float\n", codefile);
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if ( !been_here++)
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{
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fputs("Warning : dummy float-constant(s)\n", stderr);
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}
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}
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#else
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#define IEEEFLOAT
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con_float() {
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double f;
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double atof();
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int i;
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int j;
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double frexp();
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#ifndef OWNFLOAT
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int sign = 0;
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int fraction[4] ;
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#else OWNFLOAT
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float fl;
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char *p;
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#endif OWNFLOAT
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if (argval!= 4 && argval!= 8) {
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fprintf(stderr,"float constant size = %d\n",argval);
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fatal("bad fcon size");
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}
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fprintf(codefile,"!float %s sz %d\n", str, argval);
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f = atof(str);
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if (f == 0) {
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if (argval == 8) fprintf(codefile, ".data2 0, 0\n");
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fprintf(codefile, ".data2 0, 0\n");
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return;
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}
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#ifdef OWNFLOAT
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if (argval == 4) {
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/* careful: avoid overflow */
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double ldexp();
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f = frexp(f, &i);
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fl = f;
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fl = frexp(fl,&j);
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if (i+j > 127) {
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/* overflow situation */
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fprintf(codefile, ".data1 0%o, 0377, 0377, 0377 ! overflow\n",
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f < 0 ? 0377 : 0177);
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return;
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}
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if (i+j < -127) {
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/* underflow situation */
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fprintf(codefile, ".data1 0%o, 0200, 0, 0 ! underflow\n",
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f < 0 ? 0200 : 0);
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return;
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}
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fl = ldexp(fl, i+j);
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p = (char *) &fl;
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}
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else {
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p = (char *) &f;
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}
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fprintf(codefile, ".data1 0%o", *p++ & 0377);
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for (i = argval-1; i; i--) {
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fprintf(codefile,",0%o", *p++ & 0377);
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}
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#else OWNFLOAT
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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 = 2*f - 1.0; /* hidden bit */
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#ifdef IEEEFLOAT
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if (argval == 4) {
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#endif IEEEFLOAT
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i = (i + 128) & 0377;
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fraction[0] = (sign << 15) | (i << 7);
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for (j = 6; j>= 0; j--) {
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f *= 2;
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if (f >= 1.0) {
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f -= 1.0;
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fraction[0] |= (1 << j);
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}
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}
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#ifdef IEEEFLOAT
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}
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else {
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i = (i + 1024) & 03777;
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fraction[0] = (sign << 15) | (i << 4);
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for (j = 3; j>= 0; j--) {
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f *= 2;
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if (f >= 1.0) {
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fraction[0] |= (1 << j);
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f -= 1.0;
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}
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}
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}
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#endif IEEEFLOAT
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for (i = 1; i < argval / 2; i++) {
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fraction[i] = 0;
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for (j = 15; j>= 0; j--) {
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f *= 2;
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if (f >= 1.0) {
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fraction[i] |= (1 << j);
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f -= 1.0;
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}
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}
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}
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if (f >= 0.5) {
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for (i = argval/2 - 1; i >= 0; i--) {
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for (j = 0; j < 16; j++) {
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if (fraction[i] & (1 << j)) {
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fraction[i] &= ~(1 << j);
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}
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else {
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fraction[i] |= (1 << j);
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break;
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}
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}
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if (j != 16) break;
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}
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}
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for (i = 0; i < argval/2; i++) {
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fprintf(codefile,
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i != 0 ? ", 0%o, 0%o" : ".data1 0%o, 0%o",
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(fraction[i]>>8)&0377,
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fraction[i]&0377);
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}
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#endif OWNFLOAT
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putc('\n', codefile);
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}
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#endif
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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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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 += (score >> 1);
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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 != 4 || 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.l 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--; /* save/restore */
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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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i_regsave()
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{
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regnr = 0;
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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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if (regnr > MOVEM_LIMIT) {
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fputs("movem.l ", codefile);
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for (p = regsav; ;) {
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fputs(p->rs_reg, codefile);
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if (++p == ®sav[regnr]) break;
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putc('/',codefile);
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}
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fputs(",-(sp)\n", codefile);
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} else {
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for (p = regsav; p < ®sav[regnr]; p++) {
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fprintf(codefile,"move.l %s,-(sp)\n",p->rs_reg);
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}
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}
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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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#ifdef TBL68020
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fprintf(codefile,"move.%c (%ld,a6),%s\n",
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#else
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fprintf(codefile,"move.%c %ld(a6),%s\n",
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#endif
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(p->rs_size == 4 ? 'l' : 'w'),
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p->rs_off,
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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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if (regnr > MOVEM_LIMIT) {
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fputs("movem.l (sp)+,", codefile);
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for (p = regsav; ;) {
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fputs(p->rs_reg, codefile);
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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 (p = ®sav[regnr-1]; p >= regsav; p--) {
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fprintf(codefile,"move.l (sp)+,%s\n",p->rs_reg);
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}
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}
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fputs("unlk a6\nrts\n", codefile);
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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(s,off,size)
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char *s;
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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 = s;
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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,s);
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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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prolog(nlocals) full nlocals; {
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#ifdef TBL68020
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fprintf(codefile,"link\ta6,#-%ld\n",nlocals);
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#else
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fprintf(codefile,"tst.b -%ld(sp)\nlink\ta6,#-%ld\n",nlocals+40,nlocals);
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#endif
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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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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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