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[FAST486]

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Implement the two operand version of IMUL.


svn path=/branches/ntvdm/; revision=60929
This commit is contained in:
Aleksandar Andrejevic 2013-11-11 00:10:46 +00:00
parent 9677ec13ad
commit 43bbc0afb4
2 changed files with 66 additions and 1 deletions
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66
lib/fast486/extraops.c
View file

@ -212,7 +212,7 @@ Fast486ExtendedHandlers[FAST486_NUM_OPCODE_HANDLERS] =
NULL, // TODO: OPCODE 0xAC NOT IMPLEMENTED
NULL, // TODO: OPCODE 0xAD NOT IMPLEMENTED
NULL, // TODO: OPCODE 0xAE NOT IMPLEMENTED
NULL, // TODO: OPCODE 0xAF NOT IMPLEMENTED
Fast486ExtOpcodeImul,
Fast486ExtOpcodeCmpXchgByte,
Fast486ExtOpcodeCmpXchg,
NULL, // TODO: OPCODE 0xB2 NOT IMPLEMENTED
@ -712,6 +712,70 @@ FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBts)
return TRUE;
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeImul)
{
BOOLEAN OperandSize, AddressSize;
FAST486_MOD_REG_RM ModRegRm;
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return FALSE;
}
if (OperandSize)
{
LONG Source, Destination;
LONGLONG Result;
/* Read the operands */
if (!Fast486ReadModrmDwordOperands(State,
&ModRegRm,
(PULONG)&Destination,
(PULONG)&Source))
{
/* Exception occurred */
return FALSE;
}
/* Calculate the result */
Result = (LONGLONG)Source * (LONGLONG)Destination;
/* Update the flags */
State->Flags.Cf = State->Flags.Of = ((Result < -2147483648LL) || (Result > 2147483647LL));
/* Write back the result */
return Fast486WriteModrmDwordOperands(State, &ModRegRm, TRUE, (ULONG)((LONG)Result));
}
else
{
SHORT Source, Destination;
LONG Result;
/* Read the operands */
if (!Fast486ReadModrmWordOperands(State,
&ModRegRm,
(PUSHORT)&Destination,
(PUSHORT)&Source))
{
/* Exception occurred */
return FALSE;
}
/* Calculate the result */
Result = (LONG)Source * (LONG)Destination;
/* Update the flags */
State->Flags.Cf = State->Flags.Of = ((Result < -32768) || (Result > 32767));
/* Write back the result */
return Fast486WriteModrmWordOperands(State, &ModRegRm, TRUE, (USHORT)((SHORT)Result));
}
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeCmpXchgByte)
{
FAST486_MOD_REG_RM ModRegRm;

1
lib/fast486/extraops.h
View file

@ -37,6 +37,7 @@ FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBitTest);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodePushGs);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodePopGs);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBts);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeImul);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeCmpXchgByte);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeCmpXchg);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBtr);