505 lines
8.4 KiB
C
505 lines
8.4 KiB
C
/* $Header$ */
|
|
/*
|
|
* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
|
|
* See the copyright notice in the ACK home directory, in the file "Copyright".
|
|
*/
|
|
/* @(#)mach5.c 1.16 */
|
|
/*
|
|
* Motorola 68000/68010 auxiliary functions
|
|
*/
|
|
|
|
ea_1(sz, bits)
|
|
{
|
|
register flag;
|
|
|
|
if (mrg_1 > 074)
|
|
serror("no specials");
|
|
if ((flag = eamode[mrg_1>>3]) == 0)
|
|
if ((flag = eamode[010 + (mrg_1&07)]) == 0)
|
|
flag = eamode[015 + (sz>>6)];
|
|
if ((mrg_1 & 070) == 010)
|
|
checksize(sz, 2|4);
|
|
bits &= ~flag;
|
|
if (bits)
|
|
serror("bad addressing categorie");
|
|
if (flag & FITW)
|
|
Xfit (fitw(exp_1.val) ||
|
|
(mrg_1 == 074 && fit16(exp_1.val))
|
|
) ;
|
|
if (flag & FITB) {
|
|
Xfit (fitb(exp_1.val) ||
|
|
(mrg_1 == 074 && fit8(exp_1.val))
|
|
);
|
|
if (mrg_1 == 074)
|
|
exp_1.val &= 0xFF;
|
|
}
|
|
#ifdef RELOCATION
|
|
RELOMOVE(relonami, rel_1);
|
|
if (flag & ~0xFF)
|
|
newrelo(exp_1.typ, (flag>>8) | RELBR | RELWR);
|
|
#endif
|
|
if (flag & PUTL)
|
|
emit4(exp_1.val);
|
|
if (flag & PUTW)
|
|
emit2(loww(exp_1.val));
|
|
}
|
|
|
|
ea_2(sz, bits)
|
|
{
|
|
mrg_1 = mrg_2;
|
|
exp_1 = exp_2;
|
|
RELOMOVE(rel_1, rel_2);
|
|
ea_1(sz, bits);
|
|
}
|
|
|
|
index(hibyte)
|
|
{
|
|
Xfit(fitb(exp_2.val));
|
|
exp_2.val = hibyte | lowb(exp_2.val);
|
|
}
|
|
|
|
checksize(sz, bits)
|
|
{
|
|
if ((bits & (1 << (sz>>6))) == 0)
|
|
serror("bad size");
|
|
}
|
|
|
|
test68010()
|
|
{
|
|
if (model != 1 && pass == PASS_3)
|
|
warning("68010 instruction");
|
|
}
|
|
|
|
badoperand()
|
|
{
|
|
serror("bad operands");
|
|
}
|
|
|
|
shift_op(opc, sz)
|
|
{
|
|
if (mrg_1 < 010 && mrg_2 < 010) {
|
|
emit2((opc&0170470) | sz | mrg_1<<9 | mrg_2);
|
|
return;
|
|
}
|
|
if (exp_1.typ != S_ABS || mrg_1 != 074) {
|
|
badoperand();
|
|
return;
|
|
}
|
|
if (mrg_2 < 010) {
|
|
Xfit(fit3(exp_1.val));
|
|
emit2((opc&0170430) | sz | low3(exp_1.val)<<9 | mrg_2);
|
|
return;
|
|
}
|
|
checksize(sz, 2);
|
|
Xfit(exp_1.val == 1);
|
|
emit2((opc&0177700) | mrg_2);
|
|
ea_2(SIZE_W, MEM|ALT);
|
|
}
|
|
|
|
bitop(opc)
|
|
{
|
|
register bits;
|
|
|
|
bits = DTA|ALT;
|
|
if (opc == 0 && (mrg_1 < 010 || mrg_2 != 074))
|
|
bits = DTA;
|
|
if (mrg_1 < 010) {
|
|
emit2(opc | 0400 | mrg_1<<9 | mrg_2);
|
|
ea_2(0, bits);
|
|
return;
|
|
}
|
|
if (mrg_1 == 074) {
|
|
emit2(opc | 04000 | mrg_2);
|
|
ea_1(SIZE_W, 0);
|
|
ea_2(0, bits);
|
|
return;
|
|
}
|
|
badoperand();
|
|
}
|
|
|
|
add(opc, sz)
|
|
{
|
|
if ((mrg_2 & 070) == 010)
|
|
checksize(sz, 2|4);
|
|
if (
|
|
mrg_1 == 074
|
|
&&
|
|
small(
|
|
exp_1.typ==S_ABS && fit3(exp_1.val),
|
|
sz==SIZE_L ? 4 : 2
|
|
)
|
|
) {
|
|
emit2((opc&0400) | 050000 | low3(exp_1.val)<<9 | sz | mrg_2);
|
|
ea_2(sz, ALT);
|
|
return;
|
|
}
|
|
if (mrg_1 == 074 && (mrg_2 & 070) != 010) {
|
|
emit2((opc&03000) | sz | mrg_2);
|
|
ea_1(sz, 0);
|
|
ea_2(sz, DTA|ALT);
|
|
return;
|
|
}
|
|
if ((mrg_2 & 070) == 010) {
|
|
emit2((opc&0170300) | (mrg_2&7)<<9 | sz<<1 | mrg_1);
|
|
ea_1(sz, 0);
|
|
return;
|
|
}
|
|
if (to_dreg(opc, sz, 0))
|
|
return;
|
|
if (from_dreg(opc, sz, ALT|MEM))
|
|
return;
|
|
badoperand();
|
|
}
|
|
|
|
and(opc, sz)
|
|
{
|
|
if (mrg_1 == 074 && mrg_2 >= 076) { /* ccr or sr */
|
|
if (sz != SIZE_NON)
|
|
checksize(sz, mrg_2==076 ? 1 : 2);
|
|
else
|
|
sz = (mrg_2==076 ? SIZE_B : SIZE_W);
|
|
emit2((opc&07400) | sz | 074);
|
|
ea_1(sz, 0);
|
|
return;
|
|
}
|
|
if (sz == SIZE_NON)
|
|
sz = SIZE_DEF;
|
|
if (mrg_1 == 074) {
|
|
emit2((opc&07400) | sz | mrg_2);
|
|
ea_1(sz, 0);
|
|
ea_2(sz, DTA|ALT);
|
|
return;
|
|
}
|
|
if ((opc & 010000) == 0 && to_dreg(opc, sz, DTA))
|
|
return;
|
|
if (from_dreg(opc, sz, (opc & 010000) ? DTA|ALT : ALT|MEM))
|
|
return;
|
|
badoperand();
|
|
}
|
|
|
|
to_dreg(opc, sz, bits)
|
|
{
|
|
if ((mrg_2 & 070) != 000)
|
|
return(0);
|
|
emit2((opc & 0170000) | sz | (mrg_2&7)<<9 | mrg_1);
|
|
ea_1(sz, bits);
|
|
return(1);
|
|
}
|
|
|
|
from_dreg(opc, sz, bits)
|
|
{
|
|
if ((mrg_1 & 070) != 000)
|
|
return(0);
|
|
emit2((opc & 0170000) | sz | (mrg_1&7)<<9 | 0400 | mrg_2);
|
|
ea_2(sz, bits);
|
|
return(1);
|
|
}
|
|
|
|
cmp(sz)
|
|
{
|
|
register opc;
|
|
|
|
if ((mrg_1&070) == 030 && (mrg_2&070) == 030) {
|
|
emit2(0130410 | sz | (mrg_1&7) | (mrg_2&7)<<9);
|
|
return;
|
|
}
|
|
if (mrg_1 == 074 && (mrg_2 & 070) != 010) {
|
|
emit2(06000 | sz | mrg_2);
|
|
ea_1(sz, 0);
|
|
ea_2(sz, DTA|ALT);
|
|
return;
|
|
}
|
|
if (mrg_2 < 020) {
|
|
if (mrg_2 >= 010) {
|
|
checksize(sz, 2|4);
|
|
opc = 0130300 | sz<<1;
|
|
mrg_2 &= 7;
|
|
} else
|
|
opc = 0130000 | sz;
|
|
emit2(opc | mrg_2<<9 | mrg_1);
|
|
ea_1(sz, 0);
|
|
return;
|
|
}
|
|
badoperand();
|
|
}
|
|
|
|
move(sz)
|
|
{
|
|
register opc;
|
|
|
|
if (mrg_1 > 074 || mrg_2 > 074) {
|
|
move_special(sz);
|
|
return;
|
|
}
|
|
if (sz == SIZE_NON)
|
|
sz = SIZE_DEF;
|
|
if (
|
|
mrg_2<010
|
|
&&
|
|
mrg_1==074
|
|
&&
|
|
sz==SIZE_L
|
|
&&
|
|
small(exp_1.typ==S_ABS && fitb(exp_1.val), 4)
|
|
) {
|
|
emit2(070000 | mrg_2<<9 | lowb(exp_1.val));
|
|
return;
|
|
}
|
|
switch (sz) {
|
|
case SIZE_B: opc = 010000; break;
|
|
case SIZE_W: opc = 030000; break;
|
|
case SIZE_L: opc = 020000; break;
|
|
}
|
|
emit2(opc | mrg_1 | (mrg_2&7)<<9 | (mrg_2&070)<<3);
|
|
ea_1(sz, 0);
|
|
ea_2(sz, ALT);
|
|
}
|
|
|
|
move_special(sz)
|
|
{
|
|
if (mrg_2 >= 076) {
|
|
if (sz != SIZE_NON)
|
|
checksize(sz, 2);
|
|
emit2(042300 | (mrg_2==076?0:01000) | mrg_1);
|
|
ea_1(SIZE_W, DTA);
|
|
return;
|
|
}
|
|
if (mrg_1 >= 076) {
|
|
if (mrg_1 == 076)
|
|
test68010();
|
|
if (sz != SIZE_NON)
|
|
checksize(sz, 2);
|
|
emit2(040300 | (mrg_1==076?01000:0) | mrg_2);
|
|
ea_2(SIZE_W, DTA|ALT);
|
|
return;
|
|
}
|
|
if (sz != SIZE_NON)
|
|
checksize(sz, 4);
|
|
if (mrg_1==075 && (mrg_2&070)==010) {
|
|
emit2(047150 | (mrg_2&7));
|
|
return;
|
|
}
|
|
if (mrg_2==075 && (mrg_1&070)==010) {
|
|
emit2(047140 | (mrg_1&7));
|
|
return;
|
|
}
|
|
badoperand();
|
|
}
|
|
|
|
int
|
|
reverse(regs, max)
|
|
register int regs;
|
|
{
|
|
register int r, i;
|
|
|
|
r = regs; regs = 0;
|
|
for (i = max; i > 0; i--) {
|
|
regs <<= 1;
|
|
if (r & 1) regs++;
|
|
r >>= 1;
|
|
}
|
|
return regs;
|
|
}
|
|
|
|
movem(dr, sz, regs)
|
|
{
|
|
register i;
|
|
|
|
if ((mrg_2>>3) == 04) {
|
|
regs = reverse(regs, 16);
|
|
}
|
|
checksize(sz, 2|4);
|
|
if ((mrg_2>>3)-3 == dr)
|
|
badoperand();
|
|
emit2(044200 | dr<<10 | (sz & 0200) >> 1 | mrg_2);
|
|
emit2(regs);
|
|
i = CTR;
|
|
if (dr == 0 && (mrg_2&070) == 040)
|
|
i = MEM;
|
|
if (dr != 0 && (mrg_2&070) == 030)
|
|
i = MEM;
|
|
if (dr == 0)
|
|
i |= ALT;
|
|
ea_2(sz, i);
|
|
}
|
|
|
|
movep(sz)
|
|
{
|
|
checksize(sz, 2|4);
|
|
if (mrg_1<010 && (mrg_2&070)==050) {
|
|
emit2(0610 | (sz & 0200)>>1 | mrg_1<<9 | (mrg_2&7));
|
|
ea_2(sz, 0);
|
|
return;
|
|
}
|
|
if (mrg_2<010 && (mrg_1&070)==050) {
|
|
emit2(0410 | (sz & 0200)>>1 | mrg_2<<9 | (mrg_1&7));
|
|
ea_1(sz, 0);
|
|
return;
|
|
}
|
|
badoperand();
|
|
}
|
|
|
|
branch(opc, exp)
|
|
expr_t exp;
|
|
{
|
|
register sm;
|
|
|
|
exp.val -= (DOTVAL + 2);
|
|
if ((pass == PASS_2)
|
|
&&
|
|
(exp.val > 0)
|
|
&&
|
|
((exp.typ & S_DOT) == 0)
|
|
)
|
|
exp.val -= DOTGAIN;
|
|
sm = fitb(exp.val);
|
|
if ((exp.typ & ~S_DOT) != DOTTYP)
|
|
sm = 0;
|
|
if (small(sm,2)) {
|
|
if (exp.val == 0)
|
|
emit2(047161); /* NOP */
|
|
else
|
|
emit2(opc | lowb(exp.val));
|
|
} else {
|
|
Xfit(fitw(exp.val));
|
|
emit2(opc);
|
|
#ifdef RELOCATION
|
|
newrelo(exp.typ, RELPC|RELO2|RELBR|RELWR);
|
|
#endif
|
|
emit2(loww(exp.val));
|
|
}
|
|
}
|
|
|
|
ea5x73(rg, sz)
|
|
{
|
|
if ((exp_2.typ & ~S_DOT) == DOTTYP) {
|
|
/* pc relative with index */
|
|
if (sz == SIZE_NON)
|
|
sz = SIZE_DEF;
|
|
exp_2.val -= (DOTVAL + 2);
|
|
mrg_2 = 073;
|
|
checksize(sz, 2|4);
|
|
index(rg<<12 | (sz&0200)<<4);
|
|
return;
|
|
}
|
|
/* displacement */
|
|
mrg_2 = 050 | rg;
|
|
if (pass == PASS_1) /* tricky, maybe 073 in next passes */
|
|
return;
|
|
if ((rg & 010) == 0 || sz != SIZE_NON)
|
|
badoperand();
|
|
}
|
|
|
|
ea707172(sz)
|
|
{
|
|
register sm;
|
|
|
|
mrg_2 = 071;
|
|
switch (sz) {
|
|
case SIZE_B:
|
|
badoperand();
|
|
case SIZE_W:
|
|
mrg_2 = 070;
|
|
case SIZE_L:
|
|
return;
|
|
case SIZE_NON:
|
|
break;
|
|
}
|
|
if (pass == PASS_1) {
|
|
/*
|
|
* reserve a bit in the bittable
|
|
* in the following passes one call to small()
|
|
* will be done, but we don't know which one
|
|
* since exp_2.typ cannot be trusted
|
|
*/
|
|
small(0, 2);
|
|
return;
|
|
}
|
|
if ((exp_2.typ & ~S_DOT) == DOTTYP) {
|
|
sm = fitw(exp_2.val-(DOTVAL+2));
|
|
sm = small(sm, 2);
|
|
if (sm) { /* pc relative */
|
|
exp_2.val -= (DOTVAL+2);
|
|
mrg_2 = 072;
|
|
}
|
|
} else {
|
|
sm = fitw(exp_2.val);
|
|
#ifdef ASLD
|
|
if (exp_2.typ & S_VAR)
|
|
sm = 0;
|
|
#else
|
|
if (exp_2.typ != S_ABS)
|
|
sm = 0;
|
|
#endif /* ASLD */
|
|
sm = small(sm, 2);
|
|
if (sm)
|
|
mrg_2 = 070;
|
|
}
|
|
}
|
|
|
|
ea6x(rg, ir, sz)
|
|
{
|
|
mrg_2 = 060 | rg;
|
|
checksize(sz, 2|4);
|
|
index(ir<<12 | (sz&0200)<<4);
|
|
}
|
|
|
|
ea72()
|
|
{
|
|
mrg_2 = 072;
|
|
exp_2.val -= (DOTVAL + 2);
|
|
}
|
|
|
|
ea73(ri, sz)
|
|
{
|
|
mrg_2 = 073;
|
|
exp_2.val -= (DOTVAL + 2);
|
|
checksize(sz, 2|4);
|
|
index(ri<<12 | (sz&0200)<<4);
|
|
}
|
|
|
|
Xnofit()
|
|
{
|
|
if (pass == PASS_3) serror("too big");
|
|
}
|
|
|
|
fbranch(opc, exp)
|
|
expr_t exp;
|
|
{
|
|
register sm;
|
|
|
|
exp.val -= (DOTVAL + 2);
|
|
if ((pass == PASS_2)
|
|
&&
|
|
(exp.val > 0)
|
|
&&
|
|
((exp.typ & S_DOT) == 0)
|
|
)
|
|
exp.val -= DOTGAIN;
|
|
sm = fitw(exp.val);
|
|
if ((exp.typ & ~S_DOT) != DOTTYP)
|
|
sm = 0;
|
|
if (small(sm,2)) {
|
|
emit2(0170200|co_id|opc);
|
|
emit2(loww(exp.val));
|
|
return;
|
|
}
|
|
emit2(0170300|co_id|opc); /* 4 byte offset */
|
|
#ifdef RELOCATION
|
|
newrelo(exp.typ, RELPC|RELO4|RELBR|RELWR);
|
|
#endif
|
|
emit4(exp.val);
|
|
}
|
|
|
|
ch_sz_dreg(size, mode)
|
|
{
|
|
if (mode == 0 &&
|
|
(size == FSIZE_X || size == FSIZE_P || size == FSIZE_D))
|
|
serror("illegal size for data register");
|
|
}
|
|
|
|
check_fsize(sz, size)
|
|
{
|
|
if (sz != size) serror("bad size");
|
|
}
|