gem5/src/sim/pseudo_inst.cc

/*
 * Copyright (c) 2003-2006 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: Nathan Binkert
 */

#include <errno.h>
#include <fcntl.h>
#include <unistd.h>

#include <fstream>
#include <string>

#include "arch/vtophys.hh"
#include "base/debug.hh"
#include "config/full_system.hh"
#include "config/the_isa.hh"
#include "cpu/base.hh"
#include "cpu/thread_context.hh"
#include "cpu/quiesce_event.hh"
#include "params/BaseCPU.hh"
#include "sim/pseudo_inst.hh"
#include "sim/serialize.hh"
#include "sim/sim_events.hh"
#include "sim/sim_exit.hh"
#include "sim/stat_control.hh"
#include "sim/stats.hh"
#include "sim/system.hh"

#if FULL_SYSTEM
#include "arch/kernel_stats.hh"
#include "sim/vptr.hh"
#endif

using namespace std;

using namespace Stats;
using namespace TheISA;

namespace PseudoInst {

#if FULL_SYSTEM

void
arm(ThreadContext *tc)
{
    if (tc->getKernelStats())
        tc->getKernelStats()->arm();
}

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

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

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

void
quiesceNs(ThreadContext *tc, uint64_t ns)
{
    BaseCPU *cpu = tc->getCpuPtr();

    if (!cpu->params()->do_quiesce || ns == 0)
        return;

    EndQuiesceEvent *quiesceEvent = tc->getQuiesceEvent();

    Tick resume = curTick + SimClock::Int::ns * ns;

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

    DPRINTF(Quiesce, "%s: quiesceNs(%d) until %d\n",
            cpu->name(), ns, resume);

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

void
quiesceCycles(ThreadContext *tc, uint64_t cycles)
{
    BaseCPU *cpu = tc->getCpuPtr();

    if (!cpu->params()->do_quiesce || cycles == 0)
        return;

    EndQuiesceEvent *quiesceEvent = tc->getQuiesceEvent();

    Tick resume = curTick + cpu->ticks(cycles);

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

    DPRINTF(Quiesce, "%s: quiesceCycles(%d) until %d\n",
            cpu->name(), cycles, resume);

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

uint64_t
quiesceTime(ThreadContext *tc)
{
    return (tc->readLastActivate() - tc->readLastSuspend()) /
        SimClock::Int::ns;
}

#endif

uint64_t
rpns(ThreadContext *tc)
{
    return curTick / SimClock::Int::ns;
}

void
wakeCPU(ThreadContext *tc, uint64_t cpuid)
{
    System *sys = tc->getSystemPtr();
    ThreadContext *other_tc = sys->threadContexts[cpuid];
    if (other_tc->status() == ThreadContext::Suspended)
        other_tc->activate();
}

void
m5exit(ThreadContext *tc, Tick delay)
{
    Tick when = curTick + delay * SimClock::Int::ns;
    exitSimLoop("m5_exit instruction encountered", 0, when);
}

#if FULL_SYSTEM

void
loadsymbol(ThreadContext *tc)
{
    const string &filename = tc->getCpuPtr()->system->params()->symbolfile;
    if (filename.empty()) {
        return;
    }

    std::string buffer;
    ifstream file(filename.c_str());

    if (!file)
        fatal("file error: Can't open symbol table file %s\n", filename);

    while (!file.eof()) {
        getline(file, buffer);

        if (buffer.empty())
            continue;

        string::size_type idx = buffer.find(' ');
        if (idx == string::npos)
            continue;

        string address = "0x" + buffer.substr(0, idx);
        eat_white(address);
        if (address.empty())
            continue;

        // Skip over letter and space
        string symbol = buffer.substr(idx + 3);
        eat_white(symbol);
        if (symbol.empty())
            continue;

        Addr addr;
        if (!to_number(address, addr))
            continue;

        if (!tc->getSystemPtr()->kernelSymtab->insert(addr, symbol))
            continue;


        DPRINTF(Loader, "Loaded symbol: %s @ %#llx\n", symbol, addr);
    }
    file.close();
}

void
addsymbol(ThreadContext *tc, Addr addr, Addr symbolAddr)
{
    char symb[100];
    CopyStringOut(tc, symb, symbolAddr, 100);
    std::string symbol(symb);

    DPRINTF(Loader, "Loaded symbol: %s @ %#llx\n", symbol, addr);

    tc->getSystemPtr()->kernelSymtab->insert(addr,symbol);
    debugSymbolTable->insert(addr,symbol);
}

#endif


void
resetstats(ThreadContext *tc, Tick delay, Tick period)
{
    if (!tc->getCpuPtr()->params()->do_statistics_insts)
        return;


    Tick when = curTick + delay * SimClock::Int::ns;
    Tick repeat = period * SimClock::Int::ns;

    Stats::schedStatEvent(false, true, when, repeat);
}

void
dumpstats(ThreadContext *tc, Tick delay, Tick period)
{
    if (!tc->getCpuPtr()->params()->do_statistics_insts)
        return;


    Tick when = curTick + delay * SimClock::Int::ns;
    Tick repeat = period * SimClock::Int::ns;

    Stats::schedStatEvent(true, false, when, repeat);
}

void
dumpresetstats(ThreadContext *tc, Tick delay, Tick period)
{
    if (!tc->getCpuPtr()->params()->do_statistics_insts)
        return;


    Tick when = curTick + delay * SimClock::Int::ns;
    Tick repeat = period * SimClock::Int::ns;

    Stats::schedStatEvent(true, true, when, repeat);
}

void
m5checkpoint(ThreadContext *tc, Tick delay, Tick period)
{
    if (!tc->getCpuPtr()->params()->do_checkpoint_insts)
        return;

    Tick when = curTick + delay * SimClock::Int::ns;
    Tick repeat = period * SimClock::Int::ns;

    exitSimLoop("checkpoint", 0, when, repeat);
}

#if FULL_SYSTEM

uint64_t
readfile(ThreadContext *tc, Addr vaddr, uint64_t len, uint64_t offset)
{
    const string &file = tc->getSystemPtr()->params()->readfile;
    if (file.empty()) {
        return ULL(0);
    }

    uint64_t result = 0;

    int fd = ::open(file.c_str(), O_RDONLY, 0);
    if (fd < 0)
        panic("could not open file %s\n", file);

    if (::lseek(fd, offset, SEEK_SET) < 0)
        panic("could not seek: %s", strerror(errno));

    char *buf = new char[len];
    char *p = buf;
    while (len > 0) {
        int bytes = ::read(fd, p, len);
        if (bytes <= 0)
            break;

        p += bytes;
        result += bytes;
        len -= bytes;
    }

    close(fd);
    CopyIn(tc, vaddr, buf, result);
    delete [] buf;
    return result;
}

#endif

void
debugbreak(ThreadContext *tc)
{
    debug_break();
}

void
switchcpu(ThreadContext *tc)
{
    exitSimLoop("switchcpu");
}

} // namespace PseudoInst