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  * Authors: Giacomo Travaglini
  38  */
  39
  40 #include "tarmac_tracer.hh"
  41
  42 #include <string>
  43
  44 #include "arch/arm/system.hh"
  45 #include "cpu/base.hh"
  46
  47 namespace Trace {
  48
  49 std::string
  50 TarmacContext::tarmacCpuName() const
  51 {
  52     auto id = thread->getCpuPtr()->cpuId();
  53     return "cpu" + std::to_string(id);
  54 }
  55
  56 TarmacTracer::TarmacTracer(const Params *p)
  57   : InstTracer(p),
  58     startTick(p->start_tick),
  59     endTick(p->end_tick)
  60 {
  61     // Wrong parameter setting: The trace end happens before the
  62     // trace start.
  63     panic_if(startTick > endTick,
  64              "Tarmac start point: %lu is bigger than "
  65              "Tarmac end point: %lu\n", startTick, endTick);
  66
  67     // By default cpu tracers in gem5 are not tracing faults
  68     // (exceptions).
  69     // This is not in compliance with the Tarmac specification:
  70     // instructions like SVC, SMC, HVC have to be traced.
  71     // Tarmac Tracer is then automatically enabling this behaviour.
  72     setDebugFlag("ExecFaulting");
  73 }
  74
  75 InstRecord *
  76 TarmacTracer::getInstRecord(Tick when, ThreadContext *tc,
  77                            const StaticInstPtr staticInst,
  78                            ArmISA::PCState pc,
  79                            const StaticInstPtr macroStaticInst)
  80 {
  81     // Check if we need to start tracing since we have passed the
  82     // tick start point.
  83     if (when < startTick || when > endTick)
  84         return nullptr;
  85
  86     if (ArmSystem::highestELIs64(tc)) {
  87         // TarmacTracerV8
  88         return new TarmacTracerRecordV8(when, tc, staticInst, pc, *this,
  89                                         macroStaticInst);
  90     } else {
  91         // TarmacTracer
  92         return new TarmacTracerRecord(when, tc, staticInst, pc, *this,
  93                                       macroStaticInst);
  94     }
  95 }
  96
  97 } // namespace Trace
  98
  99 Trace::TarmacTracer *
 100 TarmacTracerParams::create()
 101 {
 102     return new Trace::TarmacTracer(this);
 103 }