pc_event.cc

来自「M5,一个功能强大的多处理器系统模拟器.很多针对处理器架构,性能的研究都使用它作」· CC 代码 · 共 157 行

/*
 * Copyright (c) 2002, 2003, 2004, 2005
 * The Regents of The University of Michigan
 * All Rights Reserved
 *
 * This code is part of the M5 simulator.
 *
 * Permission is granted to use, copy, create derivative works and
 * redistribute this software and such derivative works for any
 * purpose, so long as the copyright notice above, this grant of
 * permission, and the disclaimer below appear in all copies made; and
 * so long as the name of The University of Michigan is not used in
 * any advertising or publicity pertaining to the use or distribution
 * of this software without specific, written prior authorization.
 *
 * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION FROM THE
 * UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY PURPOSE, AND
 * WITHOUT WARRANTY BY THE UNIVERSITY OF MICHIGAN OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE. THE REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE
 * LIABLE FOR ANY DAMAGES, INCLUDING DIRECT, SPECIAL, INDIRECT,
 * INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM
 * ARISING OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN
 * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGES.
 *
 * Authors: Nathan L. Binkert
 *          Steven K. Reinhardt
 */

#include <algorithm>
#include <map>
#include <string>
#include <utility>

#include "base/trace.hh"
#include "config/full_system.hh"
#include "cpu/base.hh"
#include "cpu/thread_context.hh"
#include "cpu/pc_event.hh"
#include "sim/debug.hh"
#include "sim/core.hh"
#include "sim/system.hh"

using namespace std;

PCEventQueue::PCEventQueue()
{}

PCEventQueue::~PCEventQueue()
{}

bool
PCEventQueue::remove(PCEvent *event)
{
    int removed = 0;
    range_t range = equal_range(event);
    for (iterator i = range.first; i != range.second; ++i) {
        if (*i == event) {
            DPRINTF(PCEvent, "PC based event removed at %#x: %s\n",
                    event->pc(), event->descr());
            pc_map.erase(i);
            ++removed;
        }
    }

    return removed > 0;
}

bool
PCEventQueue::schedule(PCEvent *event)
{
    pc_map.push_back(event);
    sort(pc_map.begin(), pc_map.end(), MapCompare());

    DPRINTF(PCEvent, "PC based event scheduled for %#x: %s\n",
            event->pc(), event->descr());

    return true;
}

bool
PCEventQueue::doService(ThreadContext *tc)
{
    Addr pc = tc->readPC() & ~0x3;
    int serviced = 0;
    range_t range = equal_range(pc);
    for (iterator i = range.first; i != range.second; ++i) {
        // Make sure that the pc wasn't changed as the side effect of
        // another event.  This for example, prevents two invocations
        // of the SkipFuncEvent.  Maybe we should have separate PC
        // event queues for each processor?
        if (pc != (tc->readPC() & ~0x3))
            continue;

        DPRINTF(PCEvent, "PC based event serviced at %#x: %s\n",
                (*i)->pc(), (*i)->descr());

        (*i)->process(tc);
        ++serviced;
    }

    return serviced > 0;
}

void
PCEventQueue::dump() const
{
    const_iterator i = pc_map.begin();
    const_iterator e = pc_map.end();

    for (; i != e; ++i)
        cprintf("%d: event at %#x: %s\n", curTick, (*i)->pc(),
                (*i)->descr());
}

PCEventQueue::range_t
PCEventQueue::equal_range(Addr pc)
{
    return std::equal_range(pc_map.begin(), pc_map.end(), pc, MapCompare());
}

BreakPCEvent::BreakPCEvent(PCEventQueue *q, const std::string &desc, Addr addr,
                           bool del)
    : PCEvent(q, desc, addr), remove(del)
{
}

void
BreakPCEvent::process(ThreadContext *tc)
{
    StringWrap name(tc->getCpuPtr()->name() + ".break_event");
    DPRINTFN("break event %s triggered\n", descr());
    debug_break();
    if (remove)
        delete this;
}

#if FULL_SYSTEM
void
sched_break_pc_sys(System *sys, Addr addr)
{
    new BreakPCEvent(&sys->pcEventQueue, "debug break", addr, true);
}

void
sched_break_pc(Addr addr)
{
     for (vector<System *>::iterator sysi = System::systemList.begin();
          sysi != System::systemList.end(); ++sysi) {
         sched_break_pc_sys(*sysi, addr);
    }

}
#endif