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[SOFT386]

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Implement opcode group 0xF6.


svn path=/branches/ntvdm/; revision=60568
This commit is contained in:
Aleksandar Andrejevic 2013-10-06 23:57:41 +00:00
parent f10f82d938
commit 95b0bb7b60
1 changed files with 132 additions and 2 deletions
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134
lib/soft386/opgroups.c
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@ -988,8 +988,138 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeGroupD3)
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroupF6)
{
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;
}
/* Read the operands */
if (!Soft386ReadModrmByteOperands(State, &ModRegRm, &Dummy, &Value))
{
/* Exception occurred */
return FALSE;
}
switch (ModRegRm.Register)
{
/* TEST */
case 0:
case 1:
{
UCHAR Immediate, Result;
/* Fetch the immediate byte */
if (!Soft386FetchByte(State, &Immediate))
{
/* Exception occurred */
return FALSE;
}
/* Calculate the result */
Result = Value & Immediate;
/* Update the flags */
State->Flags.Cf = FALSE;
State->Flags.Of = FALSE;
State->Flags.Zf = (Result == 0) ? TRUE : FALSE;
State->Flags.Sf = (Result & SIGN_FLAG_BYTE) ? TRUE : FALSE;
State->Flags.Pf = Soft386CalculateParity(Result);
break;
}
/* NOT */
case 2:
{
/* Write back the result */
return Soft386WriteModrmByteOperands(State, &ModRegRm, FALSE, ~Value);
}
/* NEG */
case 3:
{
/* Calculate the result */
UCHAR Result = -Value;
/* Update the flags */
State->Flags.Cf = (Value != 0) ? TRUE : FALSE;
State->Flags.Of = (Value & SIGN_FLAG_BYTE) && (Result & SIGN_FLAG_BYTE);
State->Flags.Af = ((Value & 0x0F) != 0) ? TRUE : FALSE;
State->Flags.Zf = (Result == 0) ? TRUE : FALSE;
State->Flags.Sf = (Result & SIGN_FLAG_BYTE) ? TRUE : FALSE;
State->Flags.Pf = Soft386CalculateParity(Result);
/* Write back the result */
return Soft386WriteModrmByteOperands(State, &ModRegRm, FALSE, Result);
}
/* MUL */
case 4:
{
USHORT Result = (USHORT)Value * (USHORT)State->GeneralRegs[SOFT386_REG_EAX].LowByte;
/* Update the flags */
State->Flags.Cf = State->Flags.Of = (Result & 0xFF00) ? TRUE : FALSE;
/* Write back the result */
State->GeneralRegs[SOFT386_REG_EAX].LowWord = Result;
break;
}
/* IMUL */
case 5:
{
SHORT Result = (SHORT)Value * (SHORT)State->GeneralRegs[SOFT386_REG_EAX].LowByte;
/* Update the flags */
State->Flags.Cf = State->Flags.Of = ((Result > 255) || (Result < 256)) ? TRUE : FALSE;
/* Write back the result */
State->GeneralRegs[SOFT386_REG_EAX].LowWord = (USHORT)Result;
break;
}
/* DIV */
case 6:
{
UCHAR Quotient = State->GeneralRegs[SOFT386_REG_EAX].LowWord / Value;
UCHAR Remainder = State->GeneralRegs[SOFT386_REG_EAX].LowWord % Value;
/* Write back the results */
State->GeneralRegs[SOFT386_REG_EAX].LowByte = Quotient;
State->GeneralRegs[SOFT386_REG_EAX].HighByte = Remainder;
break;
}
/* IDIV */
case 7:
{
CHAR Quotient = (SHORT)State->GeneralRegs[SOFT386_REG_EAX].LowWord / (CHAR)Value;
CHAR Remainder = (SHORT)State->GeneralRegs[SOFT386_REG_EAX].LowWord % (CHAR)Value;
/* Write back the results */
State->GeneralRegs[SOFT386_REG_EAX].LowByte = (UCHAR)Quotient;
State->GeneralRegs[SOFT386_REG_EAX].HighByte = (UCHAR)Remainder;
break;
}
}
return TRUE;
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeGroupF7)