391 lines
7.1 KiB
C
391 lines
7.1 KiB
C
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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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#define RCSID5 "$Id$"
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/*
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* INTEL 8086 special routines
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*/
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void
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encode_imm(int opc, int sz, expr_t exp)
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{
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emit1(opc);
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emit1(sz);
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switch(sz)
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{
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case 4:
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case 0:
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emit1(exp.val);
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break;
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case 5:
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case 1:
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emit2(exp.val);
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break;
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default:
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emit4(exp.val);
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break;
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}
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}
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void ea_1(int param)
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{
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if ((mrg_1 & 070) || (param & ~070)) {
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serror("bad operand");
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}
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emit1(mrg_1 | param);
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switch(mrg_1 >> 6) {
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case 0:
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if (mrg_1 == 6 || (mrg_1 & 040)) {
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#ifdef RELOCATION
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RELOMOVE(relonami, rel_1);
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newrelo(exp_1.typ, RELO2);
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#endif
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emit2(exp_1.val);
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}
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break;
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case 1:
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#ifdef RELOCATION
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RELOMOVE(relonami, rel_1);
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newrelo(exp_1.typ, RELO1);
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#endif
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emit1(exp_1.val);
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break;
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case 2:
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#ifdef RELOCATION
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RELOMOVE(relonami, rel_1);
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newrelo(exp_1.typ, RELO2);
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#endif
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emit2(exp_1.val);
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break;
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}
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}
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void ea_2(int param) {
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mrg_1 = mrg_2;
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exp_1 = exp_2;
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RELOMOVE(rel_1, rel_2);
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ea_1(param);
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}
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void reverse(void)
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{
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register int m, r;
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expr_t e;
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m = mrg_1; mrg_1 = mrg_2; mrg_2 = m;
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e = exp_1; exp_1 = exp_2; exp_2 = e;
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#ifndef ASLD
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r = rel_1; rel_1 = rel_2; rel_2 = r;
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#endif
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}
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void badsyntax(void)
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{
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serror("bad operands");
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}
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void regsize(register int sz)
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{
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register int bit;
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sz <<= 3;
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bit = 010;
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sz &= bit;
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if ((mrg_1 >= 0300 && (mrg_1 & bit) != sz) ||
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(mrg_2 >= 0300 && (mrg_2 & bit) != sz))
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serror("register error");
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mrg_1 &= ~bit;
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mrg_2 &= ~bit;
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}
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void indexed(void)
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{
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int sm1, sm2;
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if (mrg_2 & ~7)
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serror("register error");
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sm1 = exp_2.typ == S_ABS && fitb((short)(exp_2.val));
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if (sm1) {
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sm2 = exp_2.val == 0 && mrg_2 != 6;
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}
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else sm2 = 0;
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if (small(sm1, 1)) {
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if (small(sm2, 1)) {
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}
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else mrg_2 |= 0100;
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}
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else {
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if (small(0, 1)) {}
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mrg_2 |= 0200;
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}
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}
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void branch(register int opc,expr_t exp)
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{
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register int sm,dist;
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int saving = opc == 0353 ? 1 : 3;
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dist = exp.val - (DOTVAL + 2);
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if (pass == PASS_2 && dist > 0 && !(exp.typ & S_DOT))
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dist -= DOTGAIN;
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sm = dist > 0 ? fitb(dist-saving) : fitb(dist);
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if ((exp.typ & ~S_DOT) != DOTTYP)
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sm = 0;
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if ((opc & 0370) == 0340) {
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fit(sm);
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sm = 1;
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} else {
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if ((sm = small(sm,saving)) == 0) {
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if (opc != 0353) {
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emit1(opc^1);
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emit1(3);
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dist -= 2;
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}
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opc = 0351;
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dist--;
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}
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}
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emit1(opc);
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if (sm == 0) {
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#ifdef RELOCATION
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newrelo(exp.typ, RELPC | RELO2);
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#endif
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emit2(dist);
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} else
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emit1(dist);
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}
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void pushop(register int opc)
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{
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regsize(1);
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if (mrg_1 & 020) {
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if ( (mrg_1&3) == 1 && opc==1 ) badsyntax() ;
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emit1(6 | opc | (mrg_1&3)<<3);
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} else if (mrg_1 >= 0300) {
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emit1(0120 | opc<<3 | (mrg_1&7));
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} else if (opc == 0) {
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if (mrg_1 & 040) { /* 070 ??? */
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if (small(exp_1.typ == S_ABS && fitb((short)exp_1.val),1)) {
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emit1(0152);
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emit1((int) exp_1.val);
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} else {
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emit1(0150);
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RELOMOVE(relonami, rel_1);
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#ifdef RELOCATION
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newrelo(exp_1.typ, RELO2);
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emit2((int) exp_1.val);
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#endif
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}
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} else {
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emit1(0377); ea_1(6<<3);
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}
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} else {
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emit1(0217); ea_1(0<<3);
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}
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}
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void addop(register int opc)
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{
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regsize(opc);
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if (mrg_2 >= 0300) {
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emit1(opc); ea_1((mrg_2&7)<<3);
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} else if ((mrg_2 & 040) && mrg_1 == 0300) {
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emit1(opc | 4);
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#ifdef RELOCATION
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RELOMOVE(relonami, rel_2);
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newrelo(exp_2.typ, (opc&1)? RELO2 : RELO1);
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#endif
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emitx(exp_2.val, (opc&1)+1);
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} else if (mrg_2 & 040) {
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if ((opc&1) == 0) {
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emit1(0200);
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} else {
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int sm = exp_2.typ == S_ABS && fitb((short)exp_2.val) &&
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opc != 011 && opc != 041 && opc != 061;
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if (small(sm, 1)) {
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emit1(0203); opc &= ~1;
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}
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else emit1(0201);
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}
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ea_1(opc & 070);
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#ifdef RELOCATION
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RELOMOVE(relonami, rel_2);
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newrelo(exp_2.typ, (opc&1)? RELO2 : RELO1);
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#endif
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emitx(exp_2.val, (opc&1)+1);
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} else if (mrg_1 >= 0300) {
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emit1(opc | 2);
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ea_2((mrg_1&7)<<3);
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} else
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badsyntax();
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}
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void rolop(register int opc)
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{
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register int cmrg;
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cmrg = mrg_2;
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mrg_2 = mrg_1;
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regsize(opc);
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if (cmrg == 0301) {
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emit1(0322 | (opc&1)); ea_1(opc&070);
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} else if (cmrg & 040) {
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if (small(exp_2.val == 1, 1)) {
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emit1(0320 | (opc&1)); ea_1(opc&070);
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} else {
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fit(fitb(exp_2.val));
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emit1(0300|(opc&1)); ea_1(opc&070);
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emit1((int)exp_2.val);
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}
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} else
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badsyntax();
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}
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void incop(register int opc)
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{
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regsize(opc);
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if ((opc&1) && mrg_1>=0300) {
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emit1(0100 | (opc&010) | (mrg_1&7));
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} else {
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emit1(0376 | (opc&1));
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ea_1(opc & 010);
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}
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}
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void callop(register int opc)
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{
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regsize(1);
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if (mrg_1 & 040) {
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if (opc == (040+(0351<<8))) {
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RELOMOVE(relonami, rel_1);
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branch(0353,exp_1);
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} else {
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exp_1.val -= (DOTVAL+3);
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emit1(opc>>8);
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#ifdef RELOCATION
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RELOMOVE(relonami, rel_1);
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newrelo(exp_1.typ, RELPC | RELO2);
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#endif
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emit2(exp_1.val);
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}
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} else {
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emit1(0377); ea_1(opc&070);
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}
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}
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void xchg(register int opc)
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{
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regsize(opc);
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if (mrg_2 == 0300 || mrg_1 < 0300)
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reverse();
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if (opc == 1 && mrg_1 == 0300 && mrg_2 >= 0300) {
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emit1(0220 | (mrg_2&7));
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} else if (mrg_1 >= 0300) {
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emit1(0206 | opc); ea_2((mrg_1&7)<<3);
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} else
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badsyntax();
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}
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void test(register int opc)
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{
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regsize(opc);
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if ((mrg_1 & 040) || mrg_2 >= 0300)
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reverse();
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if ((mrg_2 & 040) && mrg_1 == 0300) {
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emit1(0250 | opc);
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#ifdef RELOCATION
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RELOMOVE(relonami, rel_2);
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newrelo(exp_2.typ, (opc&1)? RELO2 : RELO1);
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#endif
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emitx(exp_2.val, (opc&1)+1);
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} else if (mrg_2 & 040) {
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emit1(0366 | opc);
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ea_1(0<<3);
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#ifdef RELOCATION
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RELOMOVE(relonami, rel_2);
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newrelo(exp_2.typ, (opc&1)? RELO2 : RELO1);
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#endif
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emitx(exp_2.val, (opc&1)+1);
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} else if (mrg_1 >= 0300) {
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emit1(0204 | opc); ea_2((mrg_1&7)<<3);
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} else
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badsyntax();
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}
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void mov(register int opc)
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{
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regsize(opc);
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if (mrg_1 & 020) {
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emit1(0216); ea_2((mrg_1&3)<<3);
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} else if (mrg_2 & 020) {
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emit1(0214); ea_1((mrg_2&3)<<3);
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} else if (mrg_2 & 040) {
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if (mrg_1 >= 0300) {
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emit1(0260 | opc<<3 | (mrg_1&7));
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#ifdef RELOCATION
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RELOMOVE(relonami, rel_2);
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newrelo(exp_2.typ, (opc&1)? RELO2 : RELO1);
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#endif
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emitx(exp_2.val, (opc&1)+1);
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} else {
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emit1(0306 | opc); ea_1(0<<3);
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#ifdef RELOCATION
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RELOMOVE(relonami, rel_2);
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newrelo(exp_2.typ, (opc&1)? RELO2 : RELO1);
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#endif
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emitx(exp_2.val, (opc&1)+1);
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}
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} else if (mrg_2 == 0300 && mrg_1 == 6) {
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emit1(0242 | opc);
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#ifdef RELOCATION
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RELOMOVE(relonami, rel_1);
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newrelo(exp_1.typ, RELO2);
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#endif
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emit2(exp_1.val);
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} else if (mrg_1 == 0300 && mrg_2 == 6) {
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emit1(0240 | opc);
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#ifdef RELOCATION
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RELOMOVE(relonami, rel_2);
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newrelo(exp_2.typ, RELO2);
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#endif
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emit2(exp_2.val);
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} else if (mrg_2 >= 0300) {
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emit1(0210 | opc); ea_1((mrg_2&7)<<3);
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} else if (mrg_1 >= 0300) {
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emit1(0212 | opc); ea_2((mrg_1&7)<<3);
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} else {
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badsyntax();
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}
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}
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void imul(int opc)
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{
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regsize(opc);
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if (exp_2.typ != S_ABS || ((mrg_2 & 040) == 0)) {
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serror("bad operand");
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} else {
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if (small(exp_2.typ == S_ABS && fitb((short)exp_2.val),1)) {
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emit1(0153);
|
||
|
|
ea_1((mrg_2&7)<<3);
|
||
|
|
emit1((int)exp_2.val);
|
||
|
|
} else {
|
||
|
|
emit1(0151);
|
||
|
|
ea_1((mrg_2&7)<<3);
|
||
|
|
RELOMOVE(relonami, rel_2);
|
||
|
|
#ifdef RELOCATION
|
||
|
|
newrelo(exp_2.typ, RELO2);
|
||
|
|
emit2((int) exp_2.val);
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|