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core/sal: interface for backend-specific notion of time

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This adds an interface for a backend-specific notion of time, e.g. CPU
cycles since simulator start, and a concrete implementation for the
Bochs backend.  This is needed to record CPU idle times (e.g., HLT
instruction), and for target backends capable of more timing-accurate
execution.

This change also modifies the tracing plugin to add the time to all
trace events.

Change-Id: I93ac1d54c07f32b0b8f84f333417741d8e9c8288
This commit is contained in:
Horst Schirmeier
2013-03-28 19:22:08 +01:00
parent 6b5728ece1
commit e5fe9dd525
6 changed files with 53 additions and 4 deletions
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19
src/plugins/tracing/TracingPlugin.cc
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@ -38,10 +38,17 @@ bool TracingPlugin::run()
for (unsigned i = 0; i < sizeof(ids)/sizeof(*ids); ++i)
regs[i] = simulator.getCPU(0).getRegister(ids[i]);
// the first event gets an absolute time stamp, all others a delta to their
// predecessor
simtime_t prevtime = 0, curtime;
simtime_diff_t deltatime;
while (true) {
ev = simulator.resume();
curtime = simulator.getTimerTicks();
deltatime = curtime - prevtime;
if (ev == &ev_step) {
simulator.addListener(&ev_step);
@ -55,6 +62,10 @@ bool TracingPlugin::run()
if (m_protoStreamFile) {
Trace_Event e;
e.set_ip(ip);
// only store deltas != 0
if (deltatime != 0) {
e.set_time_delta(deltatime);
}
ps->writeMessage(&e);
}
} else if (ev == &ev_mem) {
@ -81,6 +92,10 @@ bool TracingPlugin::run()
e.set_accesstype(
(ev_mem.getTriggerAccessType() & MemAccessEvent::MEM_READ) ?
e.READ : e.WRITE);
// only store deltas != 0
if (deltatime != 0) {
e.set_time_delta(deltatime);
}
/* When we're doing a full trace, we log more data in
the case of a memory event */
@ -110,6 +125,10 @@ bool TracingPlugin::run()
if (m_os)
*m_os << "[Tracing] SOMETHING IS SERIOUSLY WRONG\n";
}
// do this only if the last delta was written
// (no, e.g., memory map mismatch)
prevtime = curtime;
}
return true;