thread_context.cc

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/*
 * Copyright (c) 2012 ARM Limited
 * Copyright (c) 2013 Advanced Micro Devices, Inc.
 * All rights reserved
 *
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 * not be construed as granting a license to any other intellectual
 * 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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 * Copyright (c) 2006 The Regents of The University of Michigan
 * All rights reserved.
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 * modification, are permitted provided that the following conditions are
 * 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 IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 * Authors: Kevin Lim
 */

#include "cpu/thread_context.hh"

#include "arch/kernel_stats.hh"
#include "base/misc.hh"
#include "base/trace.hh"
#include "config/the_isa.hh"
#include "cpu/base.hh"
#include "cpu/quiesce_event.hh"
#include "debug/Context.hh"
#include "debug/Quiesce.hh"
#include "params/BaseCPU.hh"
#include "sim/full_system.hh"

void
ThreadContext::compare(ThreadContext *one, ThreadContext *two)
{
    DPRINTF(Context, "Comparing thread contexts\n");

    // First loop through the integer registers.
    for (int i = 0; i < TheISA::NumIntRegs; ++i) {
        TheISA::IntReg t1 = one->readIntReg(i);
        TheISA::IntReg t2 = two->readIntReg(i);
        if (t1 != t2)
            panic("Int reg idx %d doesn't match, one: %#x, two: %#x",
                  i, t1, t2);
    }

    // Then loop through the floating point registers.
    for (int i = 0; i < TheISA::NumFloatRegs; ++i) {
        TheISA::FloatRegBits t1 = one->readFloatRegBits(i);
        TheISA::FloatRegBits t2 = two->readFloatRegBits(i);
        if (t1 != t2)
            panic("Float reg idx %d doesn't match, one: %#x, two: %#x",
                  i, t1, t2);
    }
    for (int i = 0; i < TheISA::NumMiscRegs; ++i) {
        TheISA::MiscReg t1 = one->readMiscRegNoEffect(i);
        TheISA::MiscReg t2 = two->readMiscRegNoEffect(i);
        if (t1 != t2)
            panic("Misc reg idx %d doesn't match, one: %#x, two: %#x",
                  i, t1, t2);
    }

    // loop through the Condition Code registers.
    for (int i = 0; i < TheISA::NumCCRegs; ++i) {
        TheISA::CCReg t1 = one->readCCReg(i);
        TheISA::CCReg t2 = two->readCCReg(i);
        if (t1 != t2)
            panic("CC reg idx %d doesn't match, one: %#x, two: %#x",
                  i, t1, t2);
    }
    if (!(one->pcState() == two->pcState()))
        panic("PC state doesn't match.");
    int id1 = one->cpuId();
    int id2 = two->cpuId();
    if (id1 != id2)
        panic("CPU ids don't match, one: %d, two: %d", id1, id2);

    const ContextID cid1 = one->contextId();
    const ContextID cid2 = two->contextId();
    if (cid1 != cid2)
        panic("Context ids don't match, one: %d, two: %d", id1, id2);


}

void
ThreadContext::quiesce()
{
    if (!getCpuPtr()->params()->do_quiesce)
        return;

    DPRINTF(Quiesce, "%s: quiesce()\n", getCpuPtr()->name());

    suspend();
    if (getKernelStats())
       getKernelStats()->quiesce();
}


void
ThreadContext::quiesceTick(Tick resume)
{
    BaseCPU *cpu = getCpuPtr();

    if (!cpu->params()->do_quiesce)
        return;

    EndQuiesceEvent *quiesceEvent = getQuiesceEvent();

    cpu->reschedule(quiesceEvent, resume, true);

    DPRINTF(Quiesce, "%s: quiesceTick until %lu\n", cpu->name(), resume);

    suspend();
    if (getKernelStats())
        getKernelStats()->quiesce();
}

void
serialize(ThreadContext &tc, CheckpointOut &cp)
{
    using namespace TheISA;

    FloatRegBits floatRegs[NumFloatRegs];
    for (int i = 0; i < NumFloatRegs; ++i)
        floatRegs[i] = tc.readFloatRegBitsFlat(i);
    // This is a bit ugly, but needed to maintain backwards
    // compatibility.
    arrayParamOut(cp, "floatRegs.i", floatRegs, NumFloatRegs);

    IntReg intRegs[NumIntRegs];
    for (int i = 0; i < NumIntRegs; ++i)
        intRegs[i] = tc.readIntRegFlat(i);
    SERIALIZE_ARRAY(intRegs, NumIntRegs);

#ifdef ISA_HAS_CC_REGS
    CCReg ccRegs[NumCCRegs];
    for (int i = 0; i < NumCCRegs; ++i)
        ccRegs[i] = tc.readCCRegFlat(i);
    SERIALIZE_ARRAY(ccRegs, NumCCRegs);
#endif

    tc.pcState().serialize(cp);

    // thread_num and cpu_id are deterministic from the config
}

void
unserialize(ThreadContext &tc, CheckpointIn &cp)
{
    using namespace TheISA;

    FloatRegBits floatRegs[NumFloatRegs];
    // This is a bit ugly, but needed to maintain backwards
    // compatibility.
    arrayParamIn(cp, "floatRegs.i", floatRegs, NumFloatRegs);
    for (int i = 0; i < NumFloatRegs; ++i)
        tc.setFloatRegBitsFlat(i, floatRegs[i]);

    IntReg intRegs[NumIntRegs];
    UNSERIALIZE_ARRAY(intRegs, NumIntRegs);
    for (int i = 0; i < NumIntRegs; ++i)
        tc.setIntRegFlat(i, intRegs[i]);

#ifdef ISA_HAS_CC_REGS
    CCReg ccRegs[NumCCRegs];
    UNSERIALIZE_ARRAY(ccRegs, NumCCRegs);
    for (int i = 0; i < NumCCRegs; ++i)
        tc.setCCRegFlat(i, ccRegs[i]);
#endif

    PCState pcState;
    pcState.unserialize(cp);
    tc.pcState(pcState);

    // thread_num and cpu_id are deterministic from the config
}

void
takeOverFrom(ThreadContext &ntc, ThreadContext &otc)
{
    assert(ntc.getProcessPtr() == otc.getProcessPtr());

    ntc.setStatus(otc.status());
    ntc.copyArchRegs(&otc);
    ntc.setContextId(otc.contextId());
    ntc.setThreadId(otc.threadId());

    if (FullSystem) {
        assert(ntc.getSystemPtr() == otc.getSystemPtr());

        BaseCPU *ncpu(ntc.getCpuPtr());
        assert(ncpu);
        EndQuiesceEvent *oqe(otc.getQuiesceEvent());
        assert(oqe);
        assert(oqe->tc == &otc);

        BaseCPU *ocpu(otc.getCpuPtr());
        assert(ocpu);
        EndQuiesceEvent *nqe(ntc.getQuiesceEvent());
        assert(nqe);
        assert(nqe->tc == &ntc);

        if (oqe->scheduled()) {
            ncpu->schedule(nqe, oqe->when());
            ocpu->deschedule(oqe);
        }
    }

    otc.setStatus(ThreadContext::Halted);
}