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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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55
lib/fast486/fast486.c
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@ -55,9 +55,32 @@ Fast486ExecutionControl(PFAST486_STATE State, INT Command)
do do
{ {
/* Check if this is a new instruction */ /* Check if this is a new instruction */
if (State->PrefixFlags == 0) if (State->PrefixFlags == 0) State->SavedInstPtr = State->InstPtr;
/* Perform an instruction fetch */
if (!Fast486FetchByte(State, &Opcode)) continue;
// TODO: Check for CALL/RET to update ProcedureCallCount.
if (Fast486OpcodeHandlers[Opcode] != NULL)
{ {
State->SavedInstPtr = State->InstPtr; /* Call the opcode handler */
Fast486OpcodeHandlers[Opcode](State, Opcode);
}
else
{
/* This is not a valid opcode */
Fast486Exception(State, FAST486_EXCEPTION_UD);
}
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 * Check if there is an interrupt to execute, or a hardware interrupt signal
@ -91,34 +114,6 @@ Fast486ExecutionControl(PFAST486_STATE State, INT Command)
State->IntStatus = FAST486_INT_EXECUTE; State->IntStatus = FAST486_INT_EXECUTE;
} }
} }
/* Perform an instruction fetch */
if (!Fast486FetchByte(State, &Opcode)) continue;
// TODO: Check for CALL/RET to update ProcedureCallCount.
if (Fast486OpcodeHandlers[Opcode] != NULL)
{
/* Call the opcode handler */
Fast486OpcodeHandlers[Opcode](State, Opcode);
}
else
{
/* This is not a valid opcode */
Fast486Exception(State, FAST486_EXCEPTION_UD);
}
if (Fast486OpcodeHandlers[Opcode] != Fast486OpcodePrefix)
{
/* A non-prefix opcode has been executed, reset the prefix flags */
State->PrefixFlags = 0;
}
else
{
/* This is a prefix, go to the next instruction immediately */
continue;
}
}
while ((Command == FAST486_CONTINUE) while ((Command == FAST486_CONTINUE)
|| (Command == FAST486_STEP_OVER && ProcedureCallCount > 0) || (Command == FAST486_STEP_OVER && ProcedureCallCount > 0)
|| (Command == FAST486_STEP_OUT && ProcedureCallCount >= 0) || (Command == FAST486_STEP_OUT && ProcedureCallCount >= 0)