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[FAST486]

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Implement the XADD instruction.


svn path=/branches/ntvdm/; revision=60819
This commit is contained in:
Aleksandar Andrejevic 2013-11-01 02:48:28 +00:00
parent 5c220ef022
commit 20c0db9f08
2 changed files with 163 additions and 2 deletions
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163
lib/fast486/extraops.c
View file

@ -229,8 +229,8 @@ Fast486ExtendedHandlers[FAST486_NUM_OPCODE_HANDLERS] =
NULL, // TODO: OPCODE 0xBD NOT IMPLEMENTED
NULL, // TODO: OPCODE 0xBE NOT IMPLEMENTED
NULL, // TODO: OPCODE 0xBF NOT IMPLEMENTED
NULL, // TODO: OPCODE 0xC0 NOT IMPLEMENTED
NULL, // TODO: OPCODE 0xC1 NOT IMPLEMENTED
Fast486ExtOpcodeXaddByte,
Fast486ExtOpcodeXadd,
NULL, // Invalid
NULL, // Invalid
NULL, // Invalid
@ -1233,6 +1233,165 @@ FAST486_OPCODE_HANDLER(Fast486ExtOpcodeConditionalSet)
return Fast486WriteModrmByteOperands(State, &ModRegRm, FALSE, Value);
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeXaddByte)
{
UCHAR Source, Destination, Result;
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xC0);
TOGGLE_ADSIZE(AddressSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return FALSE;
}
if (!Fast486ReadModrmByteOperands(State,
&ModRegRm,
&Source,
&Destination))
{
/* Exception occurred */
return FALSE;
}
/* Calculate the result */
Result = Source + Destination;
/* Update the flags */
State->Flags.Cf = (Result < Source) && (Result < Destination);
State->Flags.Of = ((Source & SIGN_FLAG_BYTE) == (Destination & SIGN_FLAG_BYTE))
&& ((Source & SIGN_FLAG_BYTE) != (Result & SIGN_FLAG_BYTE));
State->Flags.Af = (((Source & 0x0F) + (Destination & 0x0F)) & 0x10) ? TRUE : FALSE;
State->Flags.Zf = (Result == 0) ? TRUE : FALSE;
State->Flags.Sf = (Result & SIGN_FLAG_BYTE) ? TRUE : FALSE;
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write the sum to the destination */
if (!Fast486WriteModrmByteOperands(State, &ModRegRm, FALSE, Result))
{
/* Exception occurred */
return FALSE;
}
/* Write the old value of the destination to the source */
if (!Fast486WriteModrmByteOperands(State, &ModRegRm, TRUE, Destination))
{
/* Exception occurred */
return FALSE;
}
return TRUE;
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeXadd)
{
FAST486_MOD_REG_RM ModRegRm;
BOOLEAN OperandSize, AddressSize;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xC1);
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_ADSIZE(AddressSize);
TOGGLE_OPSIZE(OperandSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return FALSE;
}
/* Check the operand size */
if (OperandSize)
{
ULONG Source, Destination, Result;
if (!Fast486ReadModrmDwordOperands(State,
&ModRegRm,
&Source,
&Destination))
{
/* Exception occurred */
return FALSE;
}
/* Calculate the result */
Result = Source + Destination;
/* Update the flags */
State->Flags.Cf = (Result < Source) && (Result < Destination);
State->Flags.Of = ((Source & SIGN_FLAG_LONG) == (Destination & SIGN_FLAG_LONG))
&& ((Source & SIGN_FLAG_LONG) != (Result & SIGN_FLAG_LONG));
State->Flags.Af = (((Source & 0x0F) + (Destination & 0x0F)) & 0x10) ? TRUE : FALSE;
State->Flags.Zf = (Result == 0) ? TRUE : FALSE;
State->Flags.Sf = (Result & SIGN_FLAG_LONG) ? TRUE : FALSE;
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write the sum to the destination */
if (!Fast486WriteModrmDwordOperands(State, &ModRegRm, FALSE, Result))
{
/* Exception occurred */
return FALSE;
}
/* Write the old value of the destination to the source */
if (!Fast486WriteModrmDwordOperands(State, &ModRegRm, TRUE, Destination))
{
/* Exception occurred */
return FALSE;
}
}
else
{
USHORT Source, Destination, Result;
if (!Fast486ReadModrmWordOperands(State,
&ModRegRm,
&Source,
&Destination))
{
/* Exception occurred */
return FALSE;
}
/* Calculate the result */
Result = Source + Destination;
/* Update the flags */
State->Flags.Cf = (Result < Source) && (Result < Destination);
State->Flags.Of = ((Source & SIGN_FLAG_WORD) == (Destination & SIGN_FLAG_WORD))
&& ((Source & SIGN_FLAG_WORD) != (Result & SIGN_FLAG_WORD));
State->Flags.Af = (((Source & 0x0F) + (Destination & 0x0F)) & 0x10) ? TRUE : FALSE;
State->Flags.Zf = (Result == 0) ? TRUE : FALSE;
State->Flags.Sf = (Result & SIGN_FLAG_WORD) ? TRUE : FALSE;
State->Flags.Pf = Fast486CalculateParity(Result);
/* Write the sum to the destination */
if (!Fast486WriteModrmWordOperands(State, &ModRegRm, FALSE, Result))
{
/* Exception occurred */
return FALSE;
}
/* Write the old value of the destination to the source */
if (!Fast486WriteModrmWordOperands(State, &ModRegRm, TRUE, Destination))
{
/* Exception occurred */
return FALSE;
}
}
return TRUE;
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBswap)
{
PUCHAR Pointer;

2
lib/fast486/extraops.h
View file

@ -43,6 +43,8 @@ FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBtr);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBtc);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeConditionalJmp);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeConditionalSet);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeXaddByte);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeXadd);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBswap);
FAST486_OPCODE_HANDLER(Fast486OpcodeExtended);