src/base/remote_gdb.hh - arm/gem5 - Git at Google

 /*
  * 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 __REMOTE_GDB_HH__
 #define __REMOTE_GDB_HH__

 #include <sys/signal.h>

 #include <map>

 #include "arch/types.hh"
 #include "base/pollevent.hh"
 #include "base/socket.hh"
 #include "cpu/pc_event.hh"

 class System;
 class ThreadContext;

 class GDBListener;

 enum GDBCommands
 {
     GDBSignal              = '?', // last signal
     GDBSetBaud             = 'b', // set baud (depracated)
     GDBSetBreak            = 'B', // set breakpoint (depracated)
     GDBCont                = 'c', // resume
     GDBAsyncCont           = 'C', // continue with signal
     GDBDebug               = 'd', // toggle debug flags (deprecated)
     GDBDetach              = 'D', // detach remote gdb
     GDBRegR                = 'g', // read general registers
     GDBRegW                = 'G', // write general registers
     GDBSetThread           = 'H', // set thread
     GDBCycleStep           = 'i', // step a single cycle
     GDBSigCycleStep        = 'I', // signal then cycle step
     GDBKill                = 'k', // kill program
     GDBMemR                = 'm', // read memory
     GDBMemW                = 'M', // write memory
     GDBReadReg             = 'p', // read register
     GDBSetReg              = 'P', // write register
     GDBQueryVar            = 'q', // query variable
     GDBSetVar              = 'Q', // set variable
     GDBReset               = 'r', // reset system.  (Deprecated)
     GDBStep                = 's', // step
     GDBAsyncStep           = 'S', // signal and step
     GDBThreadAlive         = 'T', // find out if the thread is alive
     GDBTargetExit          = 'W', // target exited
     GDBBinaryDload         = 'X', // write memory
     GDBClrHwBkpt           = 'z', // remove breakpoint or watchpoint
     GDBSetHwBkpt           = 'Z'  // insert breakpoint or watchpoint
 };

 const char GDBStart = '$';
 const char GDBEnd = '#';
 const char GDBGoodP = '+';
 const char GDBBadP = '-';

 const int GDBPacketBufLen = 1024;

 class BaseRemoteGDB
 {
   private:
     friend void debugger();
     friend class GDBListener;

     //Helper functions
   protected:
     int digit2i(char);
     char i2digit(int);
     Addr hex2i(const char **);
     //Address formats, break types, and gdb commands may change
     //between architectures, so they're defined as virtual
     //functions.
     virtual void mem2hex(void *, const void *, int);
     virtual const char * hex2mem(void *, const char *, int);
     virtual const char * break_type(char c);
     virtual const char * gdb_command(char cmd);

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

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

     friend class Event;
     Event *event;
     GDBListener *listener;
     int number;

   protected:
     //The socket commands come in through
     int fd;

   protected:
 #ifdef notyet
     label_t recover;
 #endif
     bool active;
     bool attached;

     System *system;
     ThreadContext *context;

   protected:
     class GdbRegCache
     {
       public:
         GdbRegCache(size_t newSize) : regs(new uint64_t[newSize]), size(newSize)
         {}
         ~GdbRegCache()
         {
             delete [] regs;
         }

         uint64_t * regs;
         size_t size;
         size_t bytes() { return size * sizeof(uint64_t); }
     };

     GdbRegCache gdbregs;

   protected:
     uint8_t getbyte();
     void putbyte(uint8_t b);

     int recv(char *data, int len);
     void send(const char *data);

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

     template <class T> T read(Addr addr);
     template <class T> void write(Addr addr, T data);

   public:
     BaseRemoteGDB(System *system, ThreadContext *context, size_t cacheSize);
     virtual ~BaseRemoteGDB();

     void replaceThreadContext(ThreadContext *tc) { context = tc; }

     void attach(int fd);
     void detach();
     bool isattached();

     virtual bool acc(Addr addr, size_t len) = 0;
     bool trap(int type);
     virtual bool breakpoint()
     {
         return trap(SIGTRAP);
     }

   protected:
     virtual void getregs() = 0;
     virtual void setregs() = 0;

     virtual void clearSingleStep() = 0;
     virtual void setSingleStep() = 0;

     PCEventQueue *getPcEventQueue();

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

       public:
         int refcount;

       public:
         HardBreakpoint(BaseRemoteGDB *_gdb, Addr addr);
         const std::string name() const { 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);
     virtual bool insertHardBreak(Addr addr, size_t len);
     bool removeHardBreak(Addr addr, size_t len);

   protected:
     void clearTempBreakpoint(Addr &bkpt);
     void setTempBreakpoint(Addr bkpt);

   public:
     std::string name();
 };

 template <class T>
 inline T
 BaseRemoteGDB::read(Addr addr)
 {
     T temp;
     read(addr, sizeof(T), (char *)&temp);
     return temp;
 }

 template <class T>
 inline void
 BaseRemoteGDB::write(Addr addr, T data)
 { write(addr, sizeof(T), (const char *)&data); }

 class GDBListener
 {
   protected:
     class Event : public PollEvent
     {
       protected:
         GDBListener *listener;

       public:
         Event(GDBListener *l, int fd, int e);
         void process(int revent);
     };

     friend class Event;
     Event *event;

   protected:
     ListenSocket listener;
     BaseRemoteGDB *gdb;
     int port;

   public:
     GDBListener(BaseRemoteGDB *g, int p);
     ~GDBListener();

     void accept();
     void listen();
     std::string name();
 };

 #endif /* __REMOTE_GDB_H__ */
	/*
	* 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 __REMOTE_GDB_HH__
	#define __REMOTE_GDB_HH__

	#include <sys/signal.h>

	#include <map>

	#include "arch/types.hh"
	#include "base/pollevent.hh"
	#include "base/socket.hh"
	#include "cpu/pc_event.hh"

	class System;
	class ThreadContext;

	class GDBListener;

	enum GDBCommands
	{
	GDBSignal = '?', // last signal
	GDBSetBaud = 'b', // set baud (depracated)
	GDBSetBreak = 'B', // set breakpoint (depracated)
	GDBCont = 'c', // resume
	GDBAsyncCont = 'C', // continue with signal
	GDBDebug = 'd', // toggle debug flags (deprecated)
	GDBDetach = 'D', // detach remote gdb
	GDBRegR = 'g', // read general registers
	GDBRegW = 'G', // write general registers
	GDBSetThread = 'H', // set thread
	GDBCycleStep = 'i', // step a single cycle
	GDBSigCycleStep = 'I', // signal then cycle step
	GDBKill = 'k', // kill program
	GDBMemR = 'm', // read memory
	GDBMemW = 'M', // write memory
	GDBReadReg = 'p', // read register
	GDBSetReg = 'P', // write register
	GDBQueryVar = 'q', // query variable
	GDBSetVar = 'Q', // set variable
	GDBReset = 'r', // reset system. (Deprecated)
	GDBStep = 's', // step
	GDBAsyncStep = 'S', // signal and step
	GDBThreadAlive = 'T', // find out if the thread is alive
	GDBTargetExit = 'W', // target exited
	GDBBinaryDload = 'X', // write memory
	GDBClrHwBkpt = 'z', // remove breakpoint or watchpoint
	GDBSetHwBkpt = 'Z' // insert breakpoint or watchpoint
	};

	const char GDBStart = '$';
	const char GDBEnd = '#';
	const char GDBGoodP = '+';
	const char GDBBadP = '-';

	const int GDBPacketBufLen = 1024;

	class BaseRemoteGDB
	{
	private:
	friend void debugger();
	friend class GDBListener;

	//Helper functions
	protected:
	int digit2i(char);
	char i2digit(int);
	Addr hex2i(const char **);
	//Address formats, break types, and gdb commands may change
	//between architectures, so they're defined as virtual
	//functions.
	virtual void mem2hex(void , const void , int);
	virtual const char * hex2mem(void , const char , int);
	virtual const char * break_type(char c);
	virtual const char * gdb_command(char cmd);

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

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

	friend class Event;
	Event *event;
	GDBListener *listener;
	int number;

	protected:
	//The socket commands come in through
	int fd;

	protected:
	#ifdef notyet
	label_t recover;
	#endif
	bool active;
	bool attached;

	System *system;
	ThreadContext *context;

	protected:
	class GdbRegCache
	{
	public:
	GdbRegCache(size_t newSize) : regs(new uint64_t[newSize]), size(newSize)
	{}
	~GdbRegCache()
	{
	delete [] regs;
	}

	uint64_t * regs;
	size_t size;
	size_t bytes() { return size * sizeof(uint64_t); }
	};

	GdbRegCache gdbregs;

	protected:
	uint8_t getbyte();
	void putbyte(uint8_t b);

	int recv(char *data, int len);
	void send(const char *data);

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

	template <class T> T read(Addr addr);
	template <class T> void write(Addr addr, T data);

	public:
	BaseRemoteGDB(System system, ThreadContext context, size_t cacheSize);
	virtual ~BaseRemoteGDB();

	void replaceThreadContext(ThreadContext *tc) { context = tc; }

	void attach(int fd);
	void detach();
	bool isattached();

	virtual bool acc(Addr addr, size_t len) = 0;
	bool trap(int type);
	virtual bool breakpoint()
	{
	return trap(SIGTRAP);
	}

	protected:
	virtual void getregs() = 0;
	virtual void setregs() = 0;

	virtual void clearSingleStep() = 0;
	virtual void setSingleStep() = 0;

	PCEventQueue *getPcEventQueue();

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

	public:
	int refcount;

	public:
	HardBreakpoint(BaseRemoteGDB *_gdb, Addr addr);
	const std::string name() const { 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);
	virtual bool insertHardBreak(Addr addr, size_t len);
	bool removeHardBreak(Addr addr, size_t len);

	protected:
	void clearTempBreakpoint(Addr &bkpt);
	void setTempBreakpoint(Addr bkpt);

	public:
	std::string name();
	};

	template <class T>
	inline T
	BaseRemoteGDB::read(Addr addr)
	{
	T temp;
	read(addr, sizeof(T), (char *)&temp);
	return temp;
	}

	template <class T>
	inline void
	BaseRemoteGDB::write(Addr addr, T data)
	{ write(addr, sizeof(T), (const char *)&data); }

	class GDBListener
	{
	protected:
	class Event : public PollEvent
	{
	protected:
	GDBListener *listener;

	public:
	Event(GDBListener *l, int fd, int e);
	void process(int revent);
	};

	friend class Event;
	Event *event;

	protected:
	ListenSocket listener;
	BaseRemoteGDB *gdb;
	int port;

	public:
	GDBListener(BaseRemoteGDB *g, int p);
	~GDBListener();

	void accept();
	void listen();
	std::string name();
	};

	#endif /* __REMOTE_GDB_H__ */