src/arch/arm/tracers/tarmac_base.cc

/*
 * Copyright (c) 2017-2019 ARM Limited
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 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
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 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
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 * this software without specific prior written permission.
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#include "arch/arm/tracers/tarmac_base.hh"

#include <algorithm>
#include <string>

#include "arch/arm/regs/misc.hh"
#include "cpu/reg_class.hh"
#include "cpu/static_inst.hh"
#include "cpu/thread_context.hh"

namespace gem5
{

using namespace ArmISA;

namespace trace {

TarmacBaseRecord::TarmacBaseRecord(Tick _when, ThreadContext *_thread,
                                   const StaticInstPtr _staticInst,
                                   const PCStateBase &_pc,
                                   const StaticInstPtr _macroStaticInst)
    : InstRecord(_when, _thread, _staticInst, _pc, _macroStaticInst)
{
}

TarmacBaseRecord::InstEntry::InstEntry(
    ThreadContext* thread,
    const PCStateBase &pc,
    const StaticInstPtr staticInst,
    bool predicate)
        : taken(predicate) ,
          addr(pc.instAddr()) ,
          opcode(staticInst->getEMI() & 0xffffffff),
          disassemble(staticInst->disassemble(addr)),
          isetstate(pcToISetState(pc)),
          mode(MODE_USER)
{

    // Operating mode gained by reading the architectural register (CPSR)
    const CPSR cpsr = thread->readMiscRegNoEffect(MISCREG_CPSR);
    mode = (OperatingMode) (uint8_t)cpsr.mode;

    // In Tarmac, instruction names are printed in capital
    // letters.
    std::for_each(disassemble.begin(), disassemble.end(),
                  [](char& c) { c = toupper(c); });
}

TarmacBaseRecord::RegEntry::RegEntry(const PCStateBase &pc)
  : isetstate(pcToISetState(pc)),
    values(2, 0)
{
    // values vector is constructed with size = 2, for
    // holding Lo and Hi values.
}

TarmacBaseRecord::MemEntry::MemEntry (
    uint8_t _size,
    Addr _addr,
    uint64_t _data)
      : size(_size), addr(_addr), data(_data)
{
}

TarmacBaseRecord::ISetState
TarmacBaseRecord::pcToISetState(const PCStateBase &pc)
{
    auto &apc = pc.as<ArmISA::PCState>();
    TarmacBaseRecord::ISetState isetstate;

    if (apc.aarch64())
        isetstate = TarmacBaseRecord::ISET_A64;
    else if (!apc.thumb() && !apc.jazelle())
        isetstate = TarmacBaseRecord::ISET_ARM;
    else if (apc.thumb() && !apc.jazelle())
        isetstate = TarmacBaseRecord::ISET_THUMB;
    else
        // No Jazelle state in TARMAC
        isetstate = TarmacBaseRecord::ISET_UNSUPPORTED;

    return isetstate;
}

} // namespace trace
} // namespace gem5