tarmac_record.cc

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/*
 * Copyright (c) 2017-2019 ARM Limited
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 *
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 * to a hardware implementation of the functionality of the software
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#include "arch/arm/tracers/tarmac_record.hh"
 
#include <memory>
 
#include "arch/arm/insts/static_inst.hh"
#include "tarmac_tracer.hh"
 
namespace gem5
{
 
using namespace ArmISA;
 
namespace trace {
 
// TARMAC Instruction Record static variables
uint64_t TarmacTracerRecord::TraceInstEntry::instCount = 0;
 
std::string
iSetStateToStr(TarmacBaseRecord::ISetState isetstate)
{
    switch (isetstate) {
      case TarmacBaseRecord::ISET_ARM:
        return "A";
      case TarmacBaseRecord::ISET_THUMB:
        return "T";
      case TarmacBaseRecord::ISET_A64:
        return "O";
      default:
        return "Unsupported";
    }
}
 
std::string
opModeToStr(OperatingMode opMode)
{
    switch (opMode) {
      case MODE_EL0T:
        return "EL0t";
      case MODE_EL1T:
        return "EL1t";
      case MODE_EL1H:
        return "EL1h";
      case MODE_EL2T:
        return "EL2t";
      case MODE_EL2H:
        return "EL2h";
      case MODE_EL3T:
        return "EL3t";
      case MODE_EL3H:
        return "EL3h";
      case MODE_USER:
        return "usr";
      case MODE_FIQ:
        return "fiq";
      case MODE_IRQ:
        return "irq";
      case MODE_SVC:
        return "svc";
      case MODE_MON:
        return "mon";
      case MODE_ABORT:
        return "abt";
      case MODE_HYP:
        return "hyp";
      case MODE_UNDEFINED:
        return "und";
      case MODE_SYSTEM:
        return "sys";
      default:
        return "Unsupported";
    }
}
 
// TarmacTracerRecord ctor
TarmacTracerRecord::TarmacTracerRecord(Tick _when, ThreadContext *_thread,
                                     const StaticInstPtr _staticInst,
                                     const PCStateBase &_pc,
                                     TarmacTracer& _tracer,
                                     const StaticInstPtr _macroStaticInst)
    : TarmacBaseRecord(_when, _thread, _staticInst,
                       _pc,  _macroStaticInst),
      tracer(_tracer)
{
}
 
TarmacTracerRecord::TraceInstEntry::TraceInstEntry(
    const TarmacContext& tarmCtx,
    bool predicate)
      : InstEntry(tarmCtx.thread, *tarmCtx.pc, tarmCtx.staticInst, predicate)
{
    secureMode = isSecure(tarmCtx.thread);
 
    auto arm_inst = static_cast<const ArmStaticInst*>(
        tarmCtx.staticInst.get()
    );
 
    // Get the instruction size as a number of bits:
    // (multiply byte size by 8)
    instSize = (arm_inst->instSize() << 3);
 
    // Mask the opcode using the instruction size: the
    // opcode field will otherwise be 32 bit wide even
    // for 16bit (Thumb) instruction.
    opcode = arm_inst->encoding();
 
    // Update the instruction count: number of executed
    // instructions.
    instCount++;
}
 
TarmacTracerRecord::TraceMemEntry::TraceMemEntry(
    const TarmacContext& tarmCtx,
    uint8_t _size, Addr _addr, uint64_t _data)
      :  MemEntry(_size, _addr, _data),
         loadAccess(tarmCtx.staticInst->isLoad())
{
}
 
TarmacTracerRecord::TraceRegEntry::TraceRegEntry(
    const TarmacContext& tarmCtx,
    const RegId& reg)
      : RegEntry(*tarmCtx.pc),
        regValid(false),
        regId(reg)
{
}
 
void
TarmacTracerRecord::TraceRegEntry::update(const TarmacContext& tarmCtx)
{
    // Fill the register entry data, according to register
    // class.
    switch (regId.classValue()) {
      case CCRegClass:
        updateCC(tarmCtx);
        break;
      case FloatRegClass:
        updateFloat(tarmCtx);
        break;
      case IntRegClass:
        updateInt(tarmCtx);
        break;
      case MiscRegClass:
        updateMisc(tarmCtx);
        break;
      case VecRegClass:
        updateVec(tarmCtx);
        break;
      case VecPredRegClass:
        updatePred(tarmCtx);
        break;
      default:
        // If unsupported format, do nothing: non updating
        // the register will prevent it to be printed.
        break;
    }
}
 
void
TarmacTracerRecord::TraceRegEntry::updateMisc(const TarmacContext& tarmCtx)
{
    auto thread = tarmCtx.thread;
 
    regValid = true;
    regName = miscRegName[regId.index()];
    values[Lo] = thread->readMiscRegNoEffect(regId.index());
 
    // If it is the CPSR:
    // update the value of the CPSR register and add
    // the CC flags on top of the value
    if (regId.index() == MISCREG_CPSR) {
        CPSR cpsr = thread->readMiscRegNoEffect(MISCREG_CPSR);
        cpsr.nz = thread->getReg(cc_reg::Nz);
        cpsr.c = thread->getReg(cc_reg::C);
        cpsr.v = thread->getReg(cc_reg::V);
        cpsr.ge = thread->getReg(cc_reg::Ge);
 
        // update the entry value
        values[Lo] = cpsr;
    }
}
 
void
TarmacTracerRecord::TraceRegEntry::updateCC(const TarmacContext& tarmCtx)
{
    auto thread = tarmCtx.thread;
 
    regValid = true;
    regName = cc_reg::RegName[regId.index()];
    values[Lo] = thread->getReg(regId);
}
 
void
TarmacTracerRecord::TraceRegEntry::updateFloat(const TarmacContext& tarmCtx)
{
    regValid = true;
    regName  = "f" + std::to_string(regId.index());
    panic("ARM doesn't support float registers.");
}
 
void
TarmacTracerRecord::TraceRegEntry::updateInt(const TarmacContext& tarmCtx)
{
    auto thread = tarmCtx.thread;
 
    // Reading operating mode from CPSR.
    // This is needed when printing the register name in case
    // of banked register (e.g. lr_svc)
    CPSR cpsr = thread->readMiscRegNoEffect(MISCREG_CPSR);
    OperatingMode mode = (OperatingMode)(uint8_t)cpsr.mode;
 
    std::string reg_suffix;
    if (mode != MODE_USER) {
        reg_suffix = "_"  + opModeToStr(mode);
    }
 
    regValid = true;
    switch (regId.index()) {
      case int_reg::Pc:
        regName = "pc";
        break;
      case StackPointerReg:
        regName = "sp" + reg_suffix ;
        break;
      case FramePointerReg:
        regName = "fp" + reg_suffix;
        break;
      case ReturnAddressReg:
        regName = "lr" + reg_suffix;
        break;
      default:
        regName  = "r" + std::to_string(regId.index());
        break;
    }
    values[Lo] = thread->getReg(regId);
}
 
void
TarmacTracerRecord::addInstEntry(std::vector<InstPtr>& queue,
                                 const TarmacContext& tarmCtx)
{
    // Generate an instruction entry in the record and
    // add it to the Instruction Queue
    queue.push_back(
        std::make_unique<TraceInstEntry>(tarmCtx, predicate)
    );
}
 
void
TarmacTracerRecord::addMemEntry(std::vector<MemPtr>& queue,
                                const TarmacContext& tarmCtx)
{
    // Generate a memory entry in the record if the record
    // implies a valid memory access, and add it to the
    // Memory Queue
    if (getMemValid()) {
        queue.push_back(
            std::make_unique<TraceMemEntry>(tarmCtx,
                                            static_cast<uint8_t>(getSize()),
                                            getAddr(), getIntData())
        );
    }
}
 
void
TarmacTracerRecord::addRegEntry(std::vector<RegPtr>& queue,
                                const TarmacContext& tarmCtx)
{
    // Generate an entry for every ARM register being
    // written by the current instruction
    for (auto reg = 0; reg < staticInst->numDestRegs(); ++reg) {
 
        RegId reg_id = staticInst->destRegIdx(reg);
 
        // Creating a single register change entry
        auto single_reg = genRegister<TraceRegEntry>(tarmCtx, reg_id);
 
        // Copying the entry and adding it to the "list"
        // of entries to be dumped to trace.
        queue.push_back(std::make_unique<TraceRegEntry>(single_reg));
    }
 
    // Gem5 is treating CPSR flags as separate registers (CC registers),
    // in contrast with Tarmac specification: we need to merge the gem5 CC
    // entries altogether with the CPSR register and produce a single entry.
    mergeCCEntry<TraceRegEntry>(queue, tarmCtx);
}
 
void
TarmacTracerRecord::dump()
{
    // Generate and print all the record's entries.
    auto &instQueue = tracer.instQueue;
    auto &memQueue = tracer.memQueue;
    auto &regQueue = tracer.regQueue;
 
    const TarmacContext tarmCtx(
        thread,
        staticInst->isMicroop()? macroStaticInst : staticInst,
        *pc
    );
 
    if (!staticInst->isMicroop()) {
        // Current instruction is NOT a micro-instruction:
        // Generate Tarmac entries and dump them immediately
 
        // Generate Tarmac entries and add them to the respective
        // queues.
        addInstEntry(instQueue, tarmCtx);
        addMemEntry(memQueue, tarmCtx);
        addRegEntry(regQueue, tarmCtx);
 
        // Flush (print) any queued entry.
        flushQueues(instQueue, memQueue, regQueue);
 
    } else {
        // Current instruction is a micro-instruction:
        // save micro entries into dedicated queues and flush them
        // into the tracefile only when the MACRO-instruction
        // has completed.
 
        if (staticInst->isFirstMicroop()) {
            addInstEntry(instQueue, tarmCtx);
        }
 
        addRegEntry(regQueue, tarmCtx);
        addMemEntry(memQueue, tarmCtx);
 
        if (staticInst->isLastMicroop()) {
            // Flush (print) any queued entry.
            flushQueues(instQueue, memQueue, regQueue);
        }
    }
}
 
template<typename Queue>
void
TarmacTracerRecord::flushQueues(Queue& queue)
{
    std::ostream &outs = tracer.output();
 
    for (const auto &single_entry : queue) {
        single_entry->print(outs);
    }
 
    queue.clear();
}
 
template<typename Queue, typename... Args>
void
TarmacTracerRecord::flushQueues(Queue& queue, Args & ... args)
{
    flushQueues(queue);
    flushQueues(args...);
}
 
void
TarmacTracerRecord::TraceInstEntry::print(
    std::ostream& outs,
    int verbosity,
    const std::string &prefix) const
{
    // Pad the opcode
    std::string opcode_str = csprintf("%0*x", instSize >> 2, opcode);
 
    // Print the instruction record formatted according
    // to the Tarmac specification
    ccprintf(outs, "%s clk %s (%u) %08x %s %s %s_%s : %s\n",
             curTick(),                   /* Tick time */
             taken? "IT" : "IS",          /* Instruction taken/skipped */
             instCount,                   /* Instruction count */
             addr,                        /* Instruction address */
             opcode_str,                  /* Instruction opcode */
             iSetStateToStr(isetstate),   /* Instruction Set */
             opModeToStr(mode),           /* Exception level */
             secureMode? "s" : "ns",      /* Security */
             disassemble);                /* Instruction disass */
}
 
void
TarmacTracerRecord::TraceMemEntry::print(
    std::ostream& outs,
    int verbosity,
    const std::string &prefix) const
{
    // Print the memory record formatted according
    // to the Tarmac specification
    ccprintf(outs, "%s clk M%s%d %08x %0*x\n",
             curTick(),                 /* Tick time */
             loadAccess? "R" : "W",     /* Access type */
             size,                      /* Access size */
             addr,                      /* Memory address */
             size*2,                    /* Padding with access size */
             data);                     /* Memory data */
}
 
void
TarmacTracerRecord::TraceRegEntry::print(
    std::ostream& outs,
    int verbosity,
    const std::string &prefix) const
{
    // Print the register record formatted according
    // to the Tarmac specification
    if (regValid)
        ccprintf(outs, "%s clk R %s %08x\n",
                 curTick(),                 /* Tick time */
                 regName,                   /* Register name */
                 values[Lo]);                  /* Register value */
}
 
} // namespace trace
} // namespace gem5