remote_gdb.hh revision 77 
1/*
2 * Copyright (c) 2003 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#ifndef __REMOTE_GDB_HH__
30#define __REMOTE_GDB_HH__
31
32#include <map>
33
34#include "base/kgdb.h"
35#include "cpu/pc_event.hh"
36#include "base/pollevent.hh"
37#include "base/socket.hh"
38
39class System;
40class ExecContext;
41class PhysicalMemory;
42
43class RemoteGDB
44{
45  protected:
46    class Event : public PollEvent
47    {
48      protected:
49        RemoteGDB *gdb;
50
51      public:
52        Event(RemoteGDB *g, int fd, int e);
53        void process(int revent);
54    };
55
56    friend class Event;
57    Event *event;
58
59  protected:
60    int fd;
61    uint64_t gdbregs[KGDB_NUMREGS];
62
63  protected:
64#ifdef notyet
65    label_t recover;
66#endif
67    bool active;
68    bool attached;
69
70    System *system;
71    PhysicalMemory *pmem;
72    ExecContext *context;
73
74  protected:
75    uint8_t getbyte();
76    void putbyte(uint8_t b);
77
78    int recv(char *data, int len);
79    void send(const char *data);
80
81  protected:
82    // Machine memory
83    bool read(Addr addr, size_t size, char *data);
84    bool write(Addr addr, size_t size, const char *data);
85
86    template <class T> T read(Addr addr);
87    template <class T> void write(Addr addr, T data);
88
89  public:
90    RemoteGDB(System *system, ExecContext *context);
91    ~RemoteGDB();
92
93    void attach(int fd);
94    void detach();
95    bool isattached();
96
97    bool acc(Addr addr, size_t len);
98    static int signal(int type);
99    bool trap(int type);
100
101  protected:
102    void getregs();
103    void setregs();
104
105    void clearSingleStep();
106    void setSingleStep();
107
108    PCEventQueue *getPcEventQueue();
109
110  protected:
111    class HardBreakpoint : public PCEvent
112    {
113      private:
114        RemoteGDB *gdb;
115
116      public:
117        HardBreakpoint(RemoteGDB *_gdb, Addr addr);
118
119        int refcount;
120        virtual void process(ExecContext *xc);
121    };
122    friend class HardBreakpoint;
123
124    typedef std::map<Addr, HardBreakpoint *> break_map_t;
125    typedef break_map_t::iterator break_iter_t;
126    break_map_t hardBreakMap;
127
128    bool insertSoftBreak(Addr addr, size_t len);
129    bool removeSoftBreak(Addr addr, size_t len);
130    bool insertHardBreak(Addr addr, size_t len);
131    bool removeHardBreak(Addr addr, size_t len);
132
133  protected:
134    struct TempBreakpoint {
135        Addr	address;		// set here
136        MachInst	bkpt_inst;		// saved instruction at bkpt
137        int		init_count;		// number of times to skip bkpt
138        int		count;			// current count
139    };
140
141    TempBreakpoint notTakenBkpt;
142    TempBreakpoint takenBkpt;
143
144    void clearTempBreakpoint(TempBreakpoint &bkpt);
145    void setTempBreakpoint(TempBreakpoint &bkpt, Addr addr);
146};
147
148template <class T>
149inline T
150RemoteGDB::read(Addr addr)
151{
152    T temp;
153    read(addr, sizeof(T), (char *)&temp);
154    return temp;
155}
156
157template <class T>
158inline void
159RemoteGDB::write(Addr addr, T data)
160{ write(addr, sizeof(T), (const char *)&data); }
161
162class GDBListener
163{
164  protected:
165    class Event : public PollEvent
166    {
167      protected:
168        GDBListener *listener;
169
170      public:
171        Event(GDBListener *l, int fd, int e);
172        void process(int revent);
173    };
174
175    friend class Event;
176    Event *event;
177
178  protected:
179    ListenSocket listener;
180    RemoteGDB *gdb;
181    int port;
182
183  public:
184    GDBListener(RemoteGDB *g, int p);
185    ~GDBListener();
186
187    void accept();
188    void listen();
189};
190
191#endif /* __REMOTE_GDB_H__ */
192