tarmac_tracer.cc

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/*
 * Copyright (c) 2017-2018, 2022 Arm Limited
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 *
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 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
 * terms below provided that you ensure that this notice is replicated
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 * modified or unmodified, in source code or in binary form.
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 * met: redistributions of source code must retain the above copyright
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#include "tarmac_tracer.hh"
 
#include <string>
 
#include "arch/arm/system.hh"
#include "base/output.hh"
#include "cpu/base.hh"
 
#include "enums/TarmacDump.hh"
 
namespace gem5
{
 
namespace trace {
 
std::string
TarmacContext::tarmacCpuName() const
{
    auto id = thread->getCpuPtr()->cpuId();
    return "cpu" + std::to_string(id);
}
 
namespace {
 
OutputStream *
tarmacDump(const TarmacTracerParams &p)
{
    switch (p.outfile) {
      case TarmacDump::stdoutput:
        return simout.findOrCreate("stdout");
      case TarmacDump::stderror:
        return simout.findOrCreate("stderr");
      case TarmacDump::file:
        return simout.findOrCreate(p.name);
      default:
        panic("Invalid option\n");
    }
}
 
}
 
TarmacTracer::TarmacTracer(const Params &p)
  : InstTracer(p),
    outstream(tarmacDump(p)),
    startTick(p.start_tick),
    endTick(p.end_tick)
{
    // Wrong parameter setting: The trace end happens before the
    // trace start.
    panic_if(startTick > endTick,
             "Tarmac start point: %lu is bigger than "
             "Tarmac end point: %lu\n", startTick, endTick);
 
    // By default cpu tracers in gem5 are not tracing faults
    // (exceptions).
    // This is not in compliance with the Tarmac specification:
    // instructions like SVC, SMC, HVC have to be traced.
    // Tarmac Tracer is then automatically enabling this behaviour.
    setDebugFlag("ExecFaulting");
}
 
InstRecord *
TarmacTracer::getInstRecord(Tick when, ThreadContext *tc,
                           const StaticInstPtr staticInst,
                           const PCStateBase &pc,
                           const StaticInstPtr macroStaticInst)
{
    // Check if we need to start tracing since we have passed the
    // tick start point.
    if (when < startTick || when > endTick)
        return nullptr;
 
    if (ArmSystem::highestELIs64(tc)) {
        // TarmacTracerV8
        return new TarmacTracerRecordV8(when, tc, staticInst, pc, *this,
                                        macroStaticInst);
    } else {
        // TarmacTracer
        return new TarmacTracerRecord(when, tc, staticInst, pc, *this,
                                      macroStaticInst);
    }
}
 
std::ostream&
TarmacTracer::output()
{
    return *(outstream->stream());
}
 
} // namespace trace
} // namespace gem5