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[FAST486]

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DAA, DAS: Update the flags.
AAA, AAS: Subtract from AX instead of AL. The specification says AL, but
so far in all known CPUs and emulators, AX is subtracted.
AAD: Clear AH.


svn path=/branches/ntvdm/; revision=61069
This commit is contained in:
Aleksandar Andrejevic 2013-11-22 02:02:05 +00:00
parent 363543b325
commit 24954c9d07
1 changed files with 19 additions and 3 deletions
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22
lib/fast486/opcodes.c
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@ -3042,6 +3042,13 @@ FAST486_OPCODE_HANDLER(Fast486OpcodeDaa)
State->Flags.Cf = TRUE;
}
Value = State->GeneralRegs[FAST486_REG_EAX].LowByte;
/* Update the flags */
State->Flags.Sf = (Value & SIGN_FLAG_BYTE) != 0;
State->Flags.Zf = (Value == 0);
State->Flags.Pf = Fast486CalculateParity(Value);
return TRUE;
}
@ -3374,6 +3381,13 @@ FAST486_OPCODE_HANDLER(Fast486OpcodeDas)
State->Flags.Cf = TRUE;
}
Value = State->GeneralRegs[FAST486_REG_EAX].LowByte;
/* Update the flags */
State->Flags.Sf = (Value & SIGN_FLAG_BYTE) != 0;
State->Flags.Zf = (Value == 0);
State->Flags.Pf = Fast486CalculateParity(Value);
return TRUE;
}
@ -3388,7 +3402,7 @@ FAST486_OPCODE_HANDLER(Fast486OpcodeAaa)
if (((Value & 0x0F) > 9) || State->Flags.Af)
{
/* Correct it */
State->GeneralRegs[FAST486_REG_EAX].LowByte += 0x06;
State->GeneralRegs[FAST486_REG_EAX].LowWord += 0x06;
State->GeneralRegs[FAST486_REG_EAX].HighByte++;
/* Set CF and AF */
@ -3417,7 +3431,7 @@ FAST486_OPCODE_HANDLER(Fast486OpcodeAas)
if (((Value & 0x0F) > 9) || State->Flags.Af)
{
/* Correct it */
State->GeneralRegs[FAST486_REG_EAX].LowByte -= 0x06;
State->GeneralRegs[FAST486_REG_EAX].LowWord -= 0x06;
State->GeneralRegs[FAST486_REG_EAX].HighByte--;
/* Set CF and AF */
@ -4876,6 +4890,7 @@ FAST486_OPCODE_HANDLER(Fast486OpcodeAam)
State->GeneralRegs[FAST486_REG_EAX].LowByte = Value %= Base;
/* Update flags */
State->Flags.Af = FALSE;
State->Flags.Zf = (Value == 0);
State->Flags.Sf = ((Value & SIGN_FLAG_BYTE) != 0);
State->Flags.Pf = Fast486CalculateParity(Value);
@ -4899,9 +4914,10 @@ FAST486_OPCODE_HANDLER(Fast486OpcodeAad)
/* Adjust */
Value += State->GeneralRegs[FAST486_REG_EAX].HighByte * Base;
State->GeneralRegs[FAST486_REG_EAX].LowByte = Value;
State->GeneralRegs[FAST486_REG_EAX].LowWord = Value;
/* Update flags */
State->Flags.Af = FALSE;
State->Flags.Zf = (Value == 0);
State->Flags.Sf = ((Value & SIGN_FLAG_BYTE) != 0);
State->Flags.Pf = Fast486CalculateParity(Value);