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[SOFT386]

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Implement far returns (both versions in Soft386OpcodeRetFar).


svn path=/branches/ntvdm/; revision=60680
This commit is contained in:
Aleksandar Andrejevic 2013-10-15 18:54:11 +00:00
parent 8d2a19ae5d
commit 151db5ddd0
1 changed files with 61 additions and 12 deletions
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73
lib/soft386/opcodes.c
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@ -242,7 +242,7 @@ Soft386OpcodeHandlers[SOFT386_NUM_OPCODE_HANDLERS] =
Soft386OpcodeGroupC7,
Soft386OpcodeEnter,
Soft386OpcodeLeave,
Soft386OpcodeRetFarImm,
Soft386OpcodeRetFar,
Soft386OpcodeRetFar,
Soft386OpcodeInt,
Soft386OpcodeInt,
@ -5075,20 +5075,69 @@ SOFT386_OPCODE_HANDLER(Soft386OpcodeLeave)
}
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeRetFarImm)
{
// TODO: NOT IMPLEMENTED
UNIMPLEMENTED;
return FALSE;
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeRetFar)
{
// TODO: NOT IMPLEMENTED
UNIMPLEMENTED;
ULONG Segment = 0;
ULONG Offset = 0;
USHORT BytesToPop = 0;
BOOLEAN Size = State->SegmentRegs[SOFT386_REG_CS].Size;
return FALSE;
/* Make sure this is the right instruction */
ASSERT((Opcode & 0xFE) == 0xCA);
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;
}
if (Opcode == 0xCA)
{
/* Fetch the number of bytes to pop after the return */
if (!Soft386FetchWord(State, &BytesToPop)) return FALSE;
}
/* Pop the offset */
if (!Soft386StackPop(State, &Offset))
{
/* Exception occurred */
return FALSE;
}
/* Pop the segment */
if (!Soft386StackPop(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, and if necessary, pop the parameters */
if (Size)
{
State->InstPtr.Long = Offset;
State->GeneralRegs[SOFT386_REG_ESP].Long += BytesToPop;
}
else
{
State->InstPtr.LowWord = LOWORD(Offset);
State->GeneralRegs[SOFT386_REG_ESP].LowWord += BytesToPop;
}
return TRUE;
}
SOFT386_OPCODE_HANDLER(Soft386OpcodeInt)