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Support the trace flag.

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This commit is contained in:
Thomas Harte 2022-05-11 09:39:15 -04:00
parent 943c924382
commit 69ba14e34e
1 changed files with 14 additions and 2 deletions
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16
InstructionSets/M68k/Implementation/ExecutorImplementation.hpp
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@ -241,6 +241,7 @@ void Executor<model, BusHandler>::run_for_instructions(int count) {
// Grab the status to store, then switch into supervisor mode.
const uint16_t status = status_.status();
status_.is_supervisor_ = 1;
status_.trace_flag_ = 0;
did_update_status();
// Push status and the program counter at instruction start.
@ -266,7 +267,11 @@ void Executor<model, BusHandler>::run_for_instructions(int count) {
template <Model model, typename BusHandler>
void Executor<model, BusHandler>::run(int &count) {
while(count--) {
// TODO: check interrupt level, trace flag.
// TODO: interrupts.
// Capture the trace bit, indicating whether to trace
// after this instruction.
const auto should_trace = status_.trace_flag_;
// Read the next instruction.
instruction_address_ = program_counter_.l;
@ -341,6 +346,11 @@ void Executor<model, BusHandler>::run(int &count) {
if(flags & StoreOp2) { store_operand(1); }
#undef store_operand
// If the trace bit was set, trigger the trace exception.
if(should_trace) {
raise_exception<false>(Exception::Trace);
}
}
}
@ -389,9 +399,11 @@ template <bool use_current_instruction_pc>
void Executor<model, BusHandler>::raise_exception(int index) {
const uint32_t address = index << 2;
// Grab the status to store, then switch into supervisor mode.
// Grab the status to store, then switch into supervisor mode
// and disable tracing.
const uint16_t status = status_.status();
status_.is_supervisor_ = 1;
status_.trace_flag_ = 0;
did_update_status();
// Push status and the program counter at instruction start.