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[SOFT386]

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Implement far jumps.


svn path=/branches/ntvdm/; revision=60679
This commit is contained in:
Aleksandar Andrejevic 2013-10-15 17:27:23 +00:00
parent 642b52c4e1
commit 8d2a19ae5d
1 changed files with 56 additions and 3 deletions
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59
lib/soft386/opcodes.c
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@ -5690,10 +5690,63 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeJmp)
SOFT386_OPCODE_HANDLER(Soft386OpcodeJmpAbs)
{
// TODO: NOT IMPLEMENTED
UNIMPLEMENTED;
USHORT Segment = 0;
ULONG Offset = 0;
BOOLEAN Size = State->SegmentRegs[SOFT386_REG_CS].Size;
return FALSE;
/* Make sure this is the right instruction */
ASSERT(Opcode == 0xEA);
if (State->PrefixFlags & SOFT386_PREFIX_OPSIZE)
{
/* The OPSIZE prefix toggles the size */
Size = !Size;
}
if (State->PrefixFlags & SOFT386_PREFIX_LOCK)
{
/* Invalid prefix */
Soft386Exception(State, SOFT386_EXCEPTION_UD);
return FALSE;
}
/* Fetch the offset */
if (Size)
{
if (!Soft386FetchDword(State, &Offset))
{
/* Exception occurred */
return FALSE;
}
}
else
{
if (!Soft386FetchWord(State, (PUSHORT)&Offset))
{
/* Exception occurred */
return FALSE;
}
}
/* Fetch the segment */
if (!Soft386FetchWord(State, &Segment))
{
/* Exception occurred */
return FALSE;
}
/* Load the new CS */
if (!Soft386LoadSegment(State, SOFT386_REG_CS, Segment))
{
/* Exception occurred */
return FALSE;
}
/* Load new (E)IP */
if (Size) State->InstPtr.Long = Offset;
else State->InstPtr.LowWord = LOWORD(Offset);
return TRUE;
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeMovAlOffset)