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[FAST486]

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Check for interrupts at the end of a cycle, to avoid confusing
debug output.


svn path=/branches/ntvdm/; revision=60956
This commit is contained in:
Aleksandar Andrejevic 2013-11-11 20:55:33 +00:00
parent b781febbfe
commit 92d4dd2b64
1 changed files with 37 additions and 42 deletions
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79
lib/fast486/fast486.c
View file

@ -55,42 +55,7 @@ Fast486ExecutionControl(PFAST486_STATE State, INT Command)
do
{
/* Check if this is a new instruction */
if (State->PrefixFlags == 0)
{
State->SavedInstPtr = State->InstPtr;
/*
* Check if there is an interrupt to execute, or a hardware interrupt signal
* while interrupts are enabled.
*/
if (State->IntStatus == FAST486_INT_EXECUTE)
{
FAST486_IDT_ENTRY IdtEntry;
/* Get the interrupt vector */
if (Fast486GetIntVector(State, State->PendingIntNum, &IdtEntry))
{
/* Perform the interrupt */
Fast486InterruptInternal(State,
IdtEntry.Selector,
MAKELONG(IdtEntry.Offset, IdtEntry.OffsetHigh),
IdtEntry.Type);
}
/* Clear the interrupt status */
State->IntStatus = FAST486_INT_NONE;
}
else if (State->Flags.If
&& (State->IntAckCallback != NULL)
&& (State->IntStatus == FAST486_INT_SIGNAL))
{
/* Acknowledge the interrupt to get the number */
State->PendingIntNum = State->IntAckCallback(State);
/* Set the interrupt status to execute on the next instruction */
State->IntStatus = FAST486_INT_EXECUTE;
}
}
if (State->PrefixFlags == 0) State->SavedInstPtr = State->InstPtr;
/* Perform an instruction fetch */
if (!Fast486FetchByte(State, &Opcode)) continue;
@ -108,16 +73,46 @@ Fast486ExecutionControl(PFAST486_STATE State, INT Command)
Fast486Exception(State, FAST486_EXCEPTION_UD);
}
if (Fast486OpcodeHandlers[Opcode] != Fast486OpcodePrefix)
{
/* A non-prefix opcode has been executed, reset the prefix flags */
State->PrefixFlags = 0;
}
else
if (Fast486OpcodeHandlers[Opcode] == Fast486OpcodePrefix)
{
/* This is a prefix, go to the next instruction immediately */
continue;
}
/* A non-prefix opcode has been executed, reset the prefix flags */
State->PrefixFlags = 0;
/*
* Check if there is an interrupt to execute, or a hardware interrupt signal
* while interrupts are enabled.
*/
if (State->IntStatus == FAST486_INT_EXECUTE)
{
FAST486_IDT_ENTRY IdtEntry;
/* Get the interrupt vector */
if (Fast486GetIntVector(State, State->PendingIntNum, &IdtEntry))
{
/* Perform the interrupt */
Fast486InterruptInternal(State,
IdtEntry.Selector,
MAKELONG(IdtEntry.Offset, IdtEntry.OffsetHigh),
IdtEntry.Type);
}
/* Clear the interrupt status */
State->IntStatus = FAST486_INT_NONE;
}
else if (State->Flags.If
&& (State->IntAckCallback != NULL)
&& (State->IntStatus == FAST486_INT_SIGNAL))
{
/* Acknowledge the interrupt to get the number */
State->PendingIntNum = State->IntAckCallback(State);
/* Set the interrupt status to execute on the next instruction */
State->IntStatus = FAST486_INT_EXECUTE;
}
}
while ((Command == FAST486_CONTINUE)
|| (Command == FAST486_STEP_OVER && ProcedureCallCount > 0)