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[FAST486]

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Implement the LSS instruction.
Fix a bug in LFS and LGS.


svn path=/branches/ntvdm/; revision=60935
This commit is contained in:
Aleksandar Andrejevic 2013-11-11 03:14:18 +00:00
parent ff2d706fb5
commit f3df799dc2
2 changed files with 71 additions and 1 deletions
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71
lib/fast486/extraops.c
View file

@ -215,7 +215,7 @@ Fast486ExtendedHandlers[FAST486_NUM_OPCODE_HANDLERS] =
Fast486ExtOpcodeImul,
Fast486ExtOpcodeCmpXchgByte,
Fast486ExtOpcodeCmpXchg,
NULL, // TODO: OPCODE 0xB2 NOT IMPLEMENTED
Fast486ExtOpcodeLss,
Fast486ExtOpcodeBtr,
Fast486ExtOpcodeLfsLgs,
Fast486ExtOpcodeLfsLgs,
@ -1102,6 +1102,74 @@ FAST486_OPCODE_HANDLER(Fast486ExtOpcodeCmpXchg)
return TRUE;
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeLss)
{
UCHAR FarPointer[6];
BOOLEAN OperandSize, AddressSize;
FAST486_MOD_REG_RM ModRegRm;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xB2);
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
/* Get the operands */
if (!Fast486ParseModRegRm(State, AddressSize, &ModRegRm))
{
/* Exception occurred */
return FALSE;
}
if (!ModRegRm.Memory)
{
/* Invalid */
Fast486Exception(State, FAST486_EXCEPTION_UD);
return FALSE;
}
if (!Fast486ReadMemory(State,
(State->PrefixFlags & FAST486_PREFIX_SEG)
? State->SegmentOverride : FAST486_REG_DS,
ModRegRm.MemoryAddress,
FALSE,
FarPointer,
OperandSize ? 6 : 4))
{
/* Exception occurred */
return FALSE;
}
if (OperandSize)
{
ULONG Offset = *((PULONG)FarPointer);
USHORT Segment = *((PUSHORT)&FarPointer[sizeof(ULONG)]);
/* Set the register to the offset */
State->GeneralRegs[ModRegRm.Register].Long = Offset;
/* Load the segment */
return Fast486LoadSegment(State,
FAST486_REG_SS,
Segment);
}
else
{
USHORT Offset = *((PUSHORT)FarPointer);
USHORT Segment = *((PUSHORT)&FarPointer[sizeof(USHORT)]);
/* Set the register to the offset */
State->GeneralRegs[ModRegRm.Register].LowWord = Offset;
/* Load the segment */
return Fast486LoadSegment(State,
FAST486_REG_SS,
Segment);
}
}
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBtr)
{
BOOLEAN OperandSize, AddressSize;
@ -1204,6 +1272,7 @@ FAST486_OPCODE_HANDLER(Fast486ExtOpcodeLfsLgs)
OperandSize = AddressSize = State->SegmentRegs[FAST486_REG_CS].Size;
TOGGLE_OPSIZE(OperandSize);
TOGGLE_ADSIZE(AddressSize);
/* Get the operands */

1
lib/fast486/extraops.h
View file

@ -42,6 +42,7 @@ FAST486_OPCODE_HANDLER(Fast486ExtOpcodeShrd);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeImul);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeCmpXchgByte);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeCmpXchg);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeLss);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeBtr);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeLfsLgs);
FAST486_OPCODE_HANDLER(Fast486ExtOpcodeMovzxByte);