src/arch/arm/tracers/tarmac_tracer.cc

   1 /*
   2  * Copyright (c) 2017-2018 ARM Limited
   3  * All rights reserved
   4  *
   5  * The license below extends only to copyright in the software and shall
   6  * not be construed as granting a license to any other intellectual
   7  * property including but not limited to intellectual property relating
   8  * to a hardware implementation of the functionality of the software
   9  * licensed hereunder.  You may use the software subject to the license
  10  * terms below provided that you ensure that this notice is replicated
  11  * unmodified and in its entirety in all distributions of the software,
  12  * modified or unmodified, in source code or in binary form.
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions are
  16  * met: redistributions of source code must retain the above copyright
  17  * notice, this list of conditions and the following disclaimer;
  18  * redistributions in binary form must reproduce the above copyright
  19  * notice, this list of conditions and the following disclaimer in the
  20  * documentation and/or other materials provided with the distribution;
  21  * neither the name of the copyright holders nor the names of its
  22  * contributors may be used to endorse or promote products derived from
  23  * this software without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  26  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  27  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  28  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  29  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  30  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  31  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  32  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  35  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include "tarmac_tracer.hh"
  39
  40 #include <string>
  41
  42 #include "arch/arm/system.hh"
  43 #include "cpu/base.hh"
  44
  45 namespace Trace {
  46
  47 std::string
  48 TarmacContext::tarmacCpuName() const
  49 {
  50     auto id = thread->getCpuPtr()->cpuId();
  51     return "cpu" + std::to_string(id);
  52 }
  53
  54 TarmacTracer::TarmacTracer(const Params &p)
  55   : InstTracer(p),
  56     startTick(p.start_tick),
  57     endTick(p.end_tick)
  58 {
  59     // Wrong parameter setting: The trace end happens before the
  60     // trace start.
  61     panic_if(startTick > endTick,
  62              "Tarmac start point: %lu is bigger than "
  63              "Tarmac end point: %lu\n", startTick, endTick);
  64
  65     // By default cpu tracers in gem5 are not tracing faults
  66     // (exceptions).
  67     // This is not in compliance with the Tarmac specification:
  68     // instructions like SVC, SMC, HVC have to be traced.
  69     // Tarmac Tracer is then automatically enabling this behaviour.
  70     setDebugFlag("ExecFaulting");
  71 }
  72
  73 InstRecord *
  74 TarmacTracer::getInstRecord(Tick when, ThreadContext *tc,
  75                            const StaticInstPtr staticInst,
  76                            ArmISA::PCState pc,
  77                            const StaticInstPtr macroStaticInst)
  78 {
  79     // Check if we need to start tracing since we have passed the
  80     // tick start point.
  81     if (when < startTick || when > endTick)
  82         return nullptr;
  83
  84     if (ArmSystem::highestELIs64(tc)) {
  85         // TarmacTracerV8
  86         return new TarmacTracerRecordV8(when, tc, staticInst, pc, *this,
  87                                         macroStaticInst);
  88     } else {
  89         // TarmacTracer
  90         return new TarmacTracerRecord(when, tc, staticInst, pc, *this,
  91                                       macroStaticInst);
  92     }
  93 }
  94
  95 } // namespace Trace
  96
  97 Trace::TarmacTracer *
  98 TarmacTracerParams::create() const
  99 {
 100     return new Trace::TarmacTracer(*this);
 101 }