xref: /gem5/src/kern/system_events.cc

/*
 * Copyright (c) 2004-2005 The Regents of The University of Michigan
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * 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;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Authors: Lisa Hsu
 *          Nathan Binkert
 */

#include "cpu/base.hh"
#include "cpu/cpu_exec_context.hh"
#include "kern/kernel_stats.hh"
#include "kern/system_events.hh"
#include "sim/system.hh"

using namespace TheISA;

void
SkipFuncEvent::process(ExecContext *xc)
{
    Addr newpc = xc->readIntReg(ReturnAddressReg);

    DPRINTF(PCEvent, "skipping %s: pc=%x, newpc=%x\n", description,
            xc->readPC(), newpc);

    xc->setPC(newpc);
    xc->setNextPC(xc->readPC() + sizeof(TheISA::MachInst));
/*
    BranchPred *bp = xc->getCpuPtr()->getBranchPred();
    if (bp != NULL) {
        bp->popRAS(xc->getThreadNum());
    }
*/
}


FnEvent::FnEvent(PCEventQueue *q, const std::string &desc, Addr addr,
                 Stats::MainBin *bin)
    : PCEvent(q, desc, addr), _name(desc), mybin(bin)
{
}

void
FnEvent::process(ExecContext *xc)
{
    if (xc->misspeculating())
        return;

    xc->getSystemPtr()->kernelBinning->call(xc, mybin);
}

void
IdleStartEvent::process(ExecContext *xc)
{
    xc->getCpuPtr()->kernelStats->setIdleProcess(
        xc->readMiscReg(AlphaISA::IPR_PALtemp23), xc);
    remove();
}

void
InterruptStartEvent::process(ExecContext *xc)
{
    xc->getCpuPtr()->kernelStats->mode(Kernel::interrupt, xc);
}

void
InterruptEndEvent::process(ExecContext *xc)
{
    // We go back to kernel, if we are user, inside the rti
    // pal code we will get switched to user because of the ICM write
    xc->getCpuPtr()->kernelStats->mode(Kernel::kernel, xc);
}