Hacky workaround to make lar work.

This commit is contained in:
David Given 2022-08-10 00:15:40 +02:00
parent b868c1ece9
commit 967b46e98e

View file

@ -10,8 +10,8 @@
void ea_1_16(int param)
{
reg_1 &= 0377;
if ((reg_1 & 070) || (param & ~070)) {
reg_1 &= 0377;
if (param & ~070) {
serror("bad operand");
}
emit1(reg_1 | param);
@ -39,542 +39,545 @@ void ea_1_16(int param)
}
void ea_1(int param) {
if (! address_long) {
ea_1_16(param);
return;
}
if (is_expr(reg_1)) {
serror("bad operand");
return;
}
if (is_reg(reg_1)) {
emit1(0300 | param | (reg_1&07));
return;
}
if (rm_1 == 04) {
/* sib field use here */
emit1(mod_1 << 6 | param | 04);
emit1(sib_1 | reg_1);
}
else emit1(mod_1<<6 | param | (reg_1&07));
if ((mod_1 == 0 && reg_1 == 5) || mod_1 == 2) {
/* ??? should this be protected by a call to "small" ??? */
if (! address_long) {
ea_1_16(param);
return;
}
if (is_expr(reg_1)) {
serror("bad operand");
return;
}
if (is_reg(reg_1)) {
emit1(0300 | param | (reg_1&07));
return;
}
if (rm_1 == 04) {
/* sib field use here */
emit1(mod_1 << 6 | param | 04);
emit1(sib_1 | reg_1);
}
else emit1(mod_1<<6 | param | (reg_1&07));
if ((mod_1 == 0 && reg_1 == 5) || mod_1 == 2) {
/* ??? should this be protected by a call to "small" ??? */
#ifdef RELOCATION
RELOMOVE(relonami, rel_1);
newrelo(exp_1.typ, RELO4);
RELOMOVE(relonami, rel_1);
newrelo(exp_1.typ, RELO4);
#endif
emit4((long)(exp_1.val));
}
else if (mod_1 == 1) {
emit1((int)(exp_1.val));
}
emit4((long)(exp_1.val));
}
else if (mod_1 == 1) {
emit1((int)(exp_1.val));
}
}
void ea_2(int param) {
op_1 = op_2;
RELOMOVE(rel_1, rel_2);
ea_1(param);
op_1 = op_2;
RELOMOVE(rel_1, rel_2);
ea_1(param);
}
int checkscale(valu_t val)
{
int v = val;
int v = val;
if (! address_long) {
serror("scaling not allowed in 16-bit mode");
return 0;
}
if (v != val) v = 0;
switch(v) {
case 1:
return 0;
case 2:
return 1 << 6;
case 4:
return 2 << 6;
case 8:
return 3 << 6;
default:
serror("bad scale");
return 0;
}
/*NOTREACHED*/
if (! address_long) {
serror("scaling not allowed in 16-bit mode");
return 0;
}
if (v != val) v = 0;
switch(v) {
case 1:
return 0;
case 2:
return 1 << 6;
case 4:
return 2 << 6;
case 8:
return 3 << 6;
default:
serror("bad scale");
return 0;
}
/*NOTREACHED*/
}
void reverse(void) {
struct operand op;
struct operand op;
#ifdef RELOCATION
int r = rel_1;
int r = rel_1;
rel_1 = rel_2; rel_2 = r;
rel_1 = rel_2; rel_2 = r;
#endif
op = op_1; op_1 = op_2; op_2 = op;
op = op_1; op_1 = op_2; op_2 = op;
}
void badsyntax(void)
{
serror("bad operands");
serror("bad operands");
}
void regsize(int sz)
{
register int bit;
register int bit;
bit = (sz&1) ? 0 : IS_R8;
if ((is_reg(reg_1) && (reg_1 & IS_R8) != bit) ||
(is_reg(reg_2) && (reg_2 & IS_R8) != bit))
serror("register error");
if (! address_long) {
reg_1 &= ~010;
reg_2 &= ~010;
}
bit = (sz&1) ? 0 : IS_R8;
if ((is_reg(reg_1) && (reg_1 & IS_R8) != bit) ||
(is_reg(reg_2) && (reg_2 & IS_R8) != bit))
serror("register error");
if (! address_long) {
reg_1 &= ~010;
reg_2 &= ~010;
}
}
void indexed(void) {
if (address_long) {
mod_2 = 0;
if (sib_2 == -1)
serror("register error");
if (rm_2 == 0 && reg_2 == 4) {
/* base register sp, no index register; use
indexed mode without index register
*/
rm_2 = 04;
sib_2 = 044;
}
if (reg_2 == 015) {
reg_2 = 05;
return;
}
if (small(exp_2.typ == S_ABS && fitb(exp_2.val), 3)) {
if (small(exp_2.val == 0 && reg_2 != 5, 1)) {
}
else mod_2 = 01;
}
else if (small(0, 1)) {
}
else mod_2 = 02;
}
else {
if (reg_2 & ~7)
serror("register error");
if (small(exp_2.typ == S_ABS && fitb(exp_2.val), 1)) {
if (small(exp_2.val == 0 && reg_2 != 6, 1)) {
}
else reg_2 |= 0100;
}
else if (small(0, 1)) {
}
else reg_2 |= 0200;
}
if (address_long) {
mod_2 = 0;
if (sib_2 == -1)
serror("register error");
if (rm_2 == 0 && reg_2 == 4) {
/* base register sp, no index register; use
indexed mode without index register
*/
rm_2 = 04;
sib_2 = 044;
}
if (reg_2 == 015) {
reg_2 = 05;
return;
}
if (small(exp_2.typ == S_ABS && fitb(exp_2.val), 3)) {
if (small(exp_2.val == 0 && reg_2 != 5, 1)) {
}
else mod_2 = 01;
}
else if (small(0, 1)) {
}
else mod_2 = 02;
}
else {
if (reg_2 & ~7)
serror("register error");
if (small(exp_2.typ == S_ABS && fitb(exp_2.val), 1)) {
if (small(exp_2.val == 0 && reg_2 != 6, 1)) {
}
else reg_2 |= 0100;
}
else if (small(0, 1)) {
}
else reg_2 |= 0200;
}
}
void ebranch(register int opc,expr_t exp)
{
/* Conditional branching; Full displacements are available
on the 80386, so the welknown trick with the reverse branch
over a jump is not needed here.
The only complication here is with the address size, which
can be set with a prefix. In this case, the user gets what
he asked for.
*/
register int sm;
register long dist;
int saving = address_long ? 4 : 2;
/* Conditional branching; Full displacements are available
on the 80386, so the welknown trick with the reverse branch
over a jump is not needed here.
The only complication here is with the address size, which
can be set with a prefix. In this case, the user gets what
he asked for.
*/
register int sm;
register long dist;
int saving = address_long ? 4 : 2;
if (opc == 0353) saving--;
dist = exp.val - (DOTVAL + 2);
if (pass == PASS_2 && dist > 0 && !(exp.typ & S_DOT))
dist -= DOTGAIN;
sm = dist > 0 ? fitb(dist-saving) : fitb(dist);
if ((exp.typ & ~S_DOT) != DOTTYP)
sm = 0;
if ((sm = small(sm,saving)) == 0) {
if (opc == 0353) {
emit1(0xe9);
}
else {
emit1(0xF);
emit1(opc | 0x80);
}
dist -= saving;
exp.val = dist;
adsize_exp(exp, RELPC);
}
else {
if (opc == 0353) {
emit1(opc);
}
else {
emit1(opc | 0x70);
}
emit1((int)dist);
}
if (opc == 0353) saving--;
dist = exp.val - (DOTVAL + 2);
if (pass == PASS_2 && dist > 0 && !(exp.typ & S_DOT))
dist -= DOTGAIN;
sm = dist > 0 ? fitb(dist-saving) : fitb(dist);
if ((exp.typ & ~S_DOT) != DOTTYP)
sm = 0;
if ((sm = small(sm,saving)) == 0) {
if (opc == 0353) {
emit1(0xe9);
}
else {
emit1(0xF);
emit1(opc | 0x80);
}
dist -= saving;
exp.val = dist;
adsize_exp(exp, RELPC);
}
else {
if (opc == 0353) {
emit1(opc);
}
else {
emit1(opc | 0x70);
}
emit1((int)dist);
}
}
void branch(register int opc,expr_t exp)
{
/* LOOP, JCXZ, etc. branch instructions.
Here, the offset just must fit in a byte.
*/
register long dist;
/* LOOP, JCXZ, etc. branch instructions.
Here, the offset just must fit in a byte.
*/
register long dist;
dist = exp.val - (DOTVAL + 2);
if (pass == PASS_2 && dist > 0 && !(exp.typ & S_DOT))
dist -= DOTGAIN;
fit((exp.typ & ~S_DOT) == DOTTYP && fitb(dist));
emit1(opc);
emit1((int)dist);
dist = exp.val - (DOTVAL + 2);
if (pass == PASS_2 && dist > 0 && !(exp.typ & S_DOT))
dist -= DOTGAIN;
fit((exp.typ & ~S_DOT) == DOTTYP && fitb(dist));
emit1(opc);
emit1((int)dist);
}
void pushop(register int opc)
{
regsize(1);
if (is_segreg(reg_1)) {
/* segment register */
if ((reg_1 & 07) <= 3)
emit1(6 | opc | (reg_1&7)<<3);
else {
emit1(0xF);
emit1(0200 | opc | ((reg_1&7)<<3));
}
} else if (is_reg(reg_1)) {
/* normal register */
emit1(0120 | opc<<3 | (reg_1&7));
} else if (opc == 0) {
if (is_expr(reg_1)) {
if (small(exp_1.typ == S_ABS && fitb(exp_1.val),
operand_long ? 3 : 1)) {
emit1(0152);
emit1((int)(exp_1.val));
}
else {
emit1(0150);
RELOMOVE(relonami, rel_1);
opsize_exp(exp_1, 1);
}
}
else {
emit1(0377); ea_1(6<<3);
}
} else {
emit1(0217); ea_1(0<<3);
}
regsize(1);
if (is_segreg(reg_1)) {
/* segment register */
if ((reg_1 & 07) <= 3)
emit1(6 | opc | (reg_1&7)<<3);
else {
emit1(0xF);
emit1(0200 | opc | ((reg_1&7)<<3));
}
} else if (is_reg(reg_1)) {
/* normal register */
emit1(0120 | opc<<3 | (reg_1&7));
} else if (opc == 0) {
if (is_expr(reg_1)) {
if (small(exp_1.typ == S_ABS && fitb(exp_1.val),
operand_long ? 3 : 1)) {
emit1(0152);
emit1((int)(exp_1.val));
}
else {
emit1(0150);
RELOMOVE(relonami, rel_1);
opsize_exp(exp_1, 1);
}
}
else {
emit1(0377); ea_1(6<<3);
}
} else {
emit1(0217); ea_1(0<<3);
}
}
void opsize_exp(expr_t exp, int nobyte)
{
if (! nobyte) {
if (! nobyte) {
#ifdef RELOCATION
newrelo(exp.typ, RELO1);
newrelo(exp.typ, RELO1);
#endif
emit1((int)(exp.val));
}
else if (operand_long) {
emit1((int)(exp.val));
}
else if (operand_long) {
#ifdef RELOCATION
newrelo(exp.typ, RELO4);
newrelo(exp.typ, RELO4);
#endif
emit4((long)(exp.val));
}
else {
emit4((long)(exp.val));
}
else {
#ifdef RELOCATION
newrelo(exp.typ, RELO2);
newrelo(exp.typ, RELO2);
#endif
emit2((int)(exp.val));
}
emit2((int)(exp.val));
}
}
void adsize_exp(expr_t exp, int relpc)
{
if (address_long) {
if (address_long) {
#ifdef RELOCATION
newrelo(exp.typ, RELO4 | relpc);
newrelo(exp.typ, RELO4 | relpc);
#endif
emit4((long)(exp.val));
}
else {
emit4((long)(exp.val));
}
else {
#ifdef RELOCATION
newrelo(exp.typ, RELO2 | relpc);
newrelo(exp.typ, RELO2 | relpc);
#endif
emit2((int)(exp.val));
}
emit2((int)(exp.val));
}
}
void addop(register int opc)
{
regsize(opc);
if (is_reg(reg_2)) {
/* Add register to register or memory */
emit1(opc); ea_1((reg_2&7)<<3);
} else if (is_acc(reg_1) && is_expr(reg_2)) {
/* Add immediate to accumulator */
emit1(opc | 4);
RELOMOVE(relonami, rel_2);
opsize_exp(exp_2, (opc&1));
} else if (is_expr(reg_2)) {
/* Add immediate to register or memory */
if ((opc&1) == 0) {
emit1(0200);
} else if (! small(exp_2.typ == S_ABS && fitb(exp_2.val),
operand_long ? 3 : 1)) {
emit1(0201);
} else {
emit1(0203); opc &= ~1;
}
ea_1(opc & 070);
RELOMOVE(relonami, rel_2);
opsize_exp(exp_2, (opc&1));
} else if (is_reg(reg_1)) {
/* Add register or memory to register */
emit1(opc | 2);
ea_2((reg_1&7)<<3);
} else
badsyntax();
regsize(opc);
if (is_reg(reg_2)) {
/* Add register to register or memory */
emit1(opc); ea_1((reg_2&7)<<3);
} else if (is_acc(reg_1) && is_expr(reg_2)) {
/* Add immediate to accumulator */
emit1(opc | 4);
RELOMOVE(relonami, rel_2);
opsize_exp(exp_2, (opc&1));
} else if (is_expr(reg_2)) {
/* Add immediate to register or memory */
if ((opc&1) == 0) {
emit1(0200);
} else if (! small(exp_2.typ == S_ABS && fitb(exp_2.val),
operand_long ? 3 : 1)) {
emit1(0201);
} else {
emit1(0203); opc &= ~1;
}
ea_1(opc & 070);
RELOMOVE(relonami, rel_2);
opsize_exp(exp_2, (opc&1));
} else if (is_reg(reg_1)) {
/* Add register or memory to register */
emit1(opc | 2);
ea_2((reg_1&7)<<3);
} else
badsyntax();
}
void rolop(register int opc)
{
register int oreg;
register int oreg;
oreg = reg_2;
reg_2 = reg_1;
regsize(opc);
if (oreg == (IS_R8 | 1 | (address_long ? 0 : 0300))) {
/* cl register */
emit1(0322 | (opc&1)); ea_1(opc&070);
} else if (is_expr(oreg)) {
if (small(exp_2.typ == S_ABS && exp_2.val == 1, 1)) {
/* shift by 1 */
emit1(0320 | (opc&1)); ea_1(opc&070);
} else {
/* shift by byte count */
emit1(0300 | (opc & 1));
ea_1(opc & 070);
oreg = reg_2;
reg_2 = reg_1;
regsize(opc);
if (oreg == (IS_R8 | 1 | (address_long ? 0 : 0300))) {
/* cl register */
emit1(0322 | (opc&1)); ea_1(opc&070);
} else if (is_expr(oreg)) {
if (small(exp_2.typ == S_ABS && exp_2.val == 1, 1)) {
/* shift by 1 */
emit1(0320 | (opc&1)); ea_1(opc&070);
} else {
/* shift by byte count */
emit1(0300 | (opc & 1));
ea_1(opc & 070);
#ifdef RELOCATION
RELOMOVE(relonami, rel_2);
newrelo(exp_2.typ, RELO1);
RELOMOVE(relonami, rel_2);
newrelo(exp_2.typ, RELO1);
#endif
emit1((int)(exp_2.val));
}
}
else
badsyntax();
emit1((int)(exp_2.val));
}
}
else
badsyntax();
}
void incop(register int opc)
{
regsize(opc);
if ((opc&1) && is_reg(reg_1)) {
/* word register */
emit1(0100 | (opc&010) | (reg_1&7));
} else {
emit1(0376 | (opc&1));
ea_1(opc & 010);
}
regsize(opc);
if ((opc&1) && is_reg(reg_1)) {
/* word register */
emit1(0100 | (opc&010) | (reg_1&7));
} else {
emit1(0376 | (opc&1));
ea_1(opc & 010);
}
}
void callop(register int opc)
{
regsize(1);
if (is_expr(reg_1)) {
if (opc == (040+(0351<<8))) {
RELOMOVE(relonami, rel_1);
ebranch(0353,exp_1);
} else {
exp_1.val -= (DOTVAL+3 + (address_long ? 2 : 0));
emit1(opc>>8);
RELOMOVE(relonami, rel_1);
adsize_exp(exp_1, RELPC);
}
} else {
emit1(0377); ea_1(opc&070);
}
regsize(1);
if (is_expr(reg_1)) {
if (opc == (040+(0351<<8))) {
RELOMOVE(relonami, rel_1);
ebranch(0353,exp_1);
} else {
exp_1.val -= (DOTVAL+3 + (address_long ? 2 : 0));
emit1(opc>>8);
RELOMOVE(relonami, rel_1);
adsize_exp(exp_1, RELPC);
}
} else {
emit1(0377); ea_1(opc&070);
}
}
void xchg(register int opc)
{
regsize(opc);
if (! is_reg(reg_1) || is_acc(reg_2)) {
reverse();
}
if (opc == 1 && is_acc(reg_1) && is_reg(reg_2)) {
emit1(0220 | (reg_2&7));
} else if (is_reg(reg_1)) {
emit1(0206 | opc); ea_2((reg_1&7)<<3);
} else
badsyntax();
regsize(opc);
if (! is_reg(reg_1) || is_acc(reg_2)) {
reverse();
}
if (opc == 1 && is_acc(reg_1) && is_reg(reg_2)) {
emit1(0220 | (reg_2&7));
} else if (is_reg(reg_1)) {
emit1(0206 | opc); ea_2((reg_1&7)<<3);
} else
badsyntax();
}
void test(register int opc)
{
regsize(opc);
if (is_reg(reg_2) || is_expr(reg_1))
reverse();
if (is_expr(reg_2)) {
if (is_acc(reg_1)) {
emit1(0250 | opc);
RELOMOVE(relonami, rel_2);
opsize_exp(exp_2, (opc&1));
}
else {
emit1(0366 | opc);
ea_1(0<<3);
RELOMOVE(relonami, rel_2);
opsize_exp(exp_2, (opc&1));
}
} else if (is_reg(reg_1)) {
emit1(0204 | opc); ea_2((reg_1&7)<<3);
} else
badsyntax();
regsize(opc);
if (is_reg(reg_2) || is_expr(reg_1))
reverse();
if (is_expr(reg_2)) {
if (is_acc(reg_1)) {
emit1(0250 | opc);
RELOMOVE(relonami, rel_2);
opsize_exp(exp_2, (opc&1));
}
else {
emit1(0366 | opc);
ea_1(0<<3);
RELOMOVE(relonami, rel_2);
opsize_exp(exp_2, (opc&1));
}
} else if (is_reg(reg_1)) {
emit1(0204 | opc); ea_2((reg_1&7)<<3);
} else
badsyntax();
}
void mov(register int opc)
{
regsize(opc);
if (is_segreg(reg_1)) {
/* to segment register */
emit1(0216); ea_2((reg_1&07)<<3);
} else if (is_segreg(reg_2)) {
/* from segment register */
emit1(0214); ea_1((reg_2&07)<<3);
} else if (is_expr(reg_2)) {
/* from immediate */
if (is_reg(reg_1)) {
/* to register */
emit1(0260 | opc<<3 | (reg_1&7));
} else {
/* to memory */
emit1(0306 | opc); ea_1(0<<3);
}
RELOMOVE(relonami, rel_2);
opsize_exp(exp_2, (opc&1));
} else if (rm_1 == 05 && is_acc(reg_2)) {
/* from accumulator to memory (displacement) */
emit1(0242 | opc);
RELOMOVE(relonami, rel_1);
adsize_exp(exp_1, 0);
} else if (rm_2 == 05 && is_acc(reg_1)) {
/* from memory (displacement) to accumulator */
emit1(0240 | opc);
RELOMOVE(relonami, rel_2);
adsize_exp(exp_2, 0);
} else if (is_reg(reg_2)) {
/* from register to memory or register */
emit1(0210 | opc); ea_1((reg_2&07)<<3);
} else if (is_reg(reg_1)) {
/* from memory or register to register */
emit1(0212 | opc); ea_2((reg_1&07)<<3);
} else
badsyntax();
regsize(opc);
if (is_segreg(reg_1)) {
/* to segment register */
emit1(0216); ea_2((reg_1&07)<<3);
} else if (is_segreg(reg_2)) {
/* from segment register */
emit1(0214); ea_1((reg_2&07)<<3);
} else if (is_expr(reg_2)) {
/* from immediate */
if (is_reg(reg_1)) {
/* to register */
emit1(0260 | opc<<3 | (reg_1&7));
} else {
/* to memory */
emit1(0306 | opc); ea_1(0<<3);
}
RELOMOVE(relonami, rel_2);
opsize_exp(exp_2, (opc&1));
} else if (rm_1 == 05 && is_acc(reg_2)) {
/* from accumulator to memory (displacement) */
emit1(0242 | opc);
RELOMOVE(relonami, rel_1);
adsize_exp(exp_1, 0);
} else if (rm_2 == 05 && is_acc(reg_1)) {
/* from memory (displacement) to accumulator */
emit1(0240 | opc);
RELOMOVE(relonami, rel_2);
adsize_exp(exp_2, 0);
} else if (is_reg(reg_2)) {
/* from register to memory or register */
emit1(0210 | opc); ea_1((reg_2&07)<<3);
} else if (is_reg(reg_1)) {
/* from memory or register to register */
emit1(0212 | opc); ea_2((reg_1&07)<<3);
} else
badsyntax();
}
void extshft(int opc, int reg)
{
int oreg2 = reg_2;
int oreg2 = reg_2;
reg_2 = reg_1;
regsize(1);
reg_2 = reg_1;
regsize(1);
emit1(0xF);
if (oreg2 == (IS_R8 | 1 | (address_long ? 0 : 0300))) {
/* cl register */
emit1(opc|1);
ea_1(reg << 3);
}
else if (is_expr(oreg2)) {
emit1(opc);
ea_1(reg << 3);
emit1(0xF);
if (oreg2 == (IS_R8 | 1 | (address_long ? 0 : 0300))) {
/* cl register */
emit1(opc|1);
ea_1(reg << 3);
}
else if (is_expr(oreg2)) {
emit1(opc);
ea_1(reg << 3);
#ifdef RELOCATION
RELOMOVE(relonami, rel_2);
newrelo(exp_2.typ, RELO1);
RELOMOVE(relonami, rel_2);
newrelo(exp_2.typ, RELO1);
#endif
emit1((int)(exp_2.val));
}
else badsyntax();
emit1((int)(exp_2.val));
}
else badsyntax();
}
void bittestop(int opc)
{
regsize(1);
emit1(0xF);
if (is_expr(reg_2)) {
emit1(0272);
ea_1(opc << 3);
regsize(1);
emit1(0xF);
if (is_expr(reg_2)) {
emit1(0272);
ea_1(opc << 3);
#ifdef RELOCATION
RELOMOVE(relonami, rel_2);
newrelo(exp_2.typ, RELO1);
RELOMOVE(relonami, rel_2);
newrelo(exp_2.typ, RELO1);
#endif
emit1((int)(exp_2.val));
}
else if (is_reg(reg_2)) {
emit1(0203 | (opc<<3));
ea_1((reg_2&7)<<3);
}
else badsyntax();
emit1((int)(exp_2.val));
}
else if (is_reg(reg_2)) {
emit1(0203 | (opc<<3));
ea_1((reg_2&7)<<3);
}
else badsyntax();
}
void imul(int reg)
{
/* This instruction is more elaborate on the 80386. Its most
general form is:
imul reg, reg_or_mem, immediate.
This is the form processed here.
*/
regsize(1);
if (is_expr(reg_1)) {
/* To also handle
imul reg, immediate, reg_or_mem
*/
reverse();
}
if (is_expr(reg_2)) {
/* The immediate form; two cases: */
if (small(exp_2.typ == S_ABS && fitb(exp_2.val),
operand_long ? 3 : 1)) {
/* case 1: 1 byte encoding of immediate */
emit1(0153);
ea_1((reg & 07) << 3);
emit1((int)(exp_2.val));
}
else {
/* case 2: WORD or DWORD encoding of immediate */
emit1(0151);
ea_1((reg & 07) << 3);
RELOMOVE(relonami, rel_2);
opsize_exp(exp_2, 1);
}
}
else if (is_reg(reg_1) && ((reg_1&7) == (reg & 07))) {
/* the "reg" field and the "reg_or_mem" field are the same,
and the 3rd operand is not an immediate ...
*/
if (reg == 0) {
/* how lucky we are, the target is the ax register */
/* However, we cannot make an optimization for f.i.
imul eax, blablabla
because the latter does not affect edx, whereas
imul blablabla
does! Therefore, "reg" is or-ed with 0x10 in the
former case, so that the test above fails.
*/
emit1(0367);
ea_2(050);
}
else {
/* another register ... */
emit1(0xF);
emit1(0257);
ea_2((reg & 07) << 3);
}
}
else badsyntax();
/* This instruction is more elaborate on the 80386. Its most
general form is:
imul reg, reg_or_mem, immediate.
This is the form processed here.
*/
regsize(1);
if (is_expr(reg_1)) {
/* To also handle
imul reg, immediate, reg_or_mem
*/
reverse();
}
if (is_expr(reg_2)) {
/* The immediate form; two cases: */
if (small(exp_2.typ == S_ABS && fitb(exp_2.val),
operand_long ? 3 : 1)) {
/* case 1: 1 byte encoding of immediate */
emit1(0153);
ea_1((reg & 07) << 3);
emit1((int)(exp_2.val));
}
else {
/* case 2: WORD or DWORD encoding of immediate */
emit1(0151);
ea_1((reg & 07) << 3);
RELOMOVE(relonami, rel_2);
opsize_exp(exp_2, 1);
}
}
else if (is_reg(reg_1) && ((reg_1&7) == (reg & 07))) {
/* the "reg" field and the "reg_or_mem" field are the same,
and the 3rd operand is not an immediate ...
*/
if (reg == 0) {
/* how lucky we are, the target is the ax register */
/* However, we cannot make an optimization for f.i.
imul eax, blablabla
because the latter does not affect edx, whereas
imul blablabla
does! Therefore, "reg" is or-ed with 0x10 in the
former case, so that the test above fails.
*/
emit1(0367);
ea_2(050);
}
else {
/* another register ... */
emit1(0xF);
emit1(0257);
ea_2((reg & 07) << 3);
}
}
else badsyntax();
}
// vim: ts=8 sw=8 et