xref: /gem5/src/arch/alpha/remote_gdb.hh

/*
 * Copyright (c) 2002-2005 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: Nathan Binkert
 */

#ifndef __ARCH_ALPHA_REMOTE_GDB_HH__
#define __ARCH_ALPHA_REMOTE_GDB_HH__

#include <map>

#include "arch/alpha/types.hh"
#include "arch/alpha/kgdb.h"
#include "base/remote_gdb.hh"
#include "cpu/pc_event.hh"
#include "base/pollevent.hh"
#include "base/socket.hh"

class System;
class ThreadContext;
class PhysicalMemory;

namespace AlphaISA
{
    class RemoteGDB : public BaseRemoteGDB
    {
      private:
        friend void debugger();
        friend class GDBListener;

      protected:
        class Event : public PollEvent
        {
          protected:
            RemoteGDB *gdb;

          public:
            Event(RemoteGDB *g, int fd, int e);
            void process(int revent);
        };

        friend class Event;
        Event *event;

      protected:
        // Machine memory
        bool write(Addr addr, size_t size, const char *data);

      public:
        RemoteGDB(System *system, ThreadContext *context);
        ~RemoteGDB();

        bool acc(Addr addr, size_t len);

      protected:
        void getregs();
        void setregs();

        void clearSingleStep();
        void setSingleStep();

        PCEventQueue *getPcEventQueue();

      protected:
        class HardBreakpoint : public PCEvent
        {
          private:
            RemoteGDB *gdb;

          public:
            int refcount;

          public:
            HardBreakpoint(RemoteGDB *_gdb, Addr addr);
            std::string name() { return gdb->name() + ".hwbkpt"; }

            virtual void process(ThreadContext *tc);
        };
        friend class HardBreakpoint;

        typedef std::map<Addr, HardBreakpoint *> break_map_t;
        typedef break_map_t::iterator break_iter_t;
        break_map_t hardBreakMap;

        bool insertSoftBreak(Addr addr, size_t len);
        bool removeSoftBreak(Addr addr, size_t len);
        bool insertHardBreak(Addr addr, size_t len);
        bool removeHardBreak(Addr addr, size_t len);

      protected:
        struct TempBreakpoint {
            Addr	address;		// set here
            MachInst	bkpt_inst;		// saved instruction at bkpt
            int		init_count;		// number of times to skip bkpt
            int		count;			// current count
        };

        TempBreakpoint notTakenBkpt;
        TempBreakpoint takenBkpt;

        void clearTempBreakpoint(TempBreakpoint &bkpt);
        void setTempBreakpoint(TempBreakpoint &bkpt, Addr addr);
    };
}

#endif /* __ARCH_ALPHA_REMOTE_GDB_H__ */