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[SOFT386]

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Implement opcode group 0xFE.


svn path=/branches/ntvdm/; revision=60453
This commit is contained in:
Aleksandar Andrejevic 2013-09-29 16:07:06 +00:00
parent f7a2f36dd0
commit 9328c2226b
1 changed files with 54 additions and 2 deletions
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56
lib/soft386/opgroups.c
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@ -383,8 +383,60 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeGroupF7)
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroupFE)
{
UNIMPLEMENTED;
return FALSE; // TODO: NOT IMPLEMENTED
UCHAR Dummy, Value;
SOFT386_MOD_REG_RM ModRegRm;
BOOLEAN AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;
if (State->PrefixFlags & SOFT386_PREFIX_ADSIZE)
{
/* The ADSIZE prefix toggles the size */
AddressSize = !AddressSize;
}
if (!Soft386ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return FALSE;
}
if (ModRegRm.Register > 1)
{
/* Invalid */
Soft386Exception(State, SOFT386_EXCEPTION_UD);
return FALSE;
}
/* Read the operands */
if (!Soft386ReadModrmByteOperands(State, &ModRegRm, &Dummy, &Value))
{
/* Exception occurred */
return FALSE;
}
if (ModRegRm.Register == 0)
{
/* Increment and update OF */
Value++;
State->Flags.Of = (Value == SIGN_FLAG_BYTE) ? TRUE : FALSE;
}
else
{
/* Decrement and update OF */
State->Flags.Of = (Value == SIGN_FLAG_BYTE) ? TRUE : FALSE;
Value--;
}
/* Update flags */
State->Flags.Sf = (Value & SIGN_FLAG_BYTE) ? TRUE : FALSE;
State->Flags.Zf = (Value == 0) ? TRUE : FALSE;
State->Flags.Af = ((Value & 0x0F) == 0) ? TRUE : FALSE;
State->Flags.Pf = Soft386CalculateParity(Value);
/* Write back the result */
return Soft386WriteModrmByteOperands(State,
&ModRegRm,
FALSE,
Value);
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroupFF)