gdb/gdbserver/server.c - binutils-gdb - Git at Google

 /* Main code for remote server for GDB.
    Copyright (C) 1989, 1993 Free Software Foundation, Inc.

    This file is part of GDB.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place - Suite 330,
    Boston, MA 02111-1307, USA.  */

 #include "server.h"

 int cont_thread;
 int general_thread;
 int thread_from_wait;
 int old_thread_from_wait;
 int extended_protocol;
 jmp_buf toplevel;
 int inferior_pid;

 static unsigned char
 start_inferior (char *argv[], char *statusptr)
 {
   inferior_pid = create_inferior (argv[0], argv);
   fprintf (stderr, "Process %s created; pid = %d\n", argv[0], inferior_pid);

   /* Wait till we are at 1st instruction in program, return signal number.  */
   return mywait (statusptr);
 }

 extern int remote_debug;

 int
 main (int argc, char *argv[])
 {
   char ch, status, own_buf[PBUFSIZ], mem_buf[2000];
   int i = 0;
   unsigned char signal;
   unsigned int len;
   CORE_ADDR mem_addr;

   if (setjmp (toplevel))
     {
       fprintf (stderr, "Exiting\n");
       exit (1);
     }

   if (argc < 3)
     error ("Usage: gdbserver tty prog [args ...]");

   initialize_low ();

   /* Wait till we are at first instruction in program.  */
   signal = start_inferior (&argv[2], &status);

   /* We are now stopped at the first instruction of the target process */

   while (1)
     {
       remote_open (argv[1]);

     restart:
       setjmp (toplevel);
       while (getpkt (own_buf) > 0)
 	{
 	  unsigned char sig;
 	  i = 0;
 	  ch = own_buf[i++];
 	  switch (ch)
 	    {
 	    case 'd':
 	      remote_debug = !remote_debug;
 	      break;
 	    case '!':
 	      extended_protocol = 1;
 	      prepare_resume_reply (own_buf, status, signal);
 	      break;
 	    case '?':
 	      prepare_resume_reply (own_buf, status, signal);
 	      break;
 	    case 'H':
 	      switch (own_buf[1])
 		{
 		case 'g':
 		  general_thread = strtol (&own_buf[2], NULL, 16);
 		  write_ok (own_buf);
 		  fetch_inferior_registers (0);
 		  break;
 		case 'c':
 		  cont_thread = strtol (&own_buf[2], NULL, 16);
 		  write_ok (own_buf);
 		  break;
 		default:
 		  /* Silently ignore it so that gdb can extend the protocol
 		     without compatibility headaches.  */
 		  own_buf[0] = '\0';
 		  break;
 		}
 	      break;
 	    case 'g':
 	      convert_int_to_ascii (registers, own_buf, REGISTER_BYTES);
 	      break;
 	    case 'G':
 	      convert_ascii_to_int (&own_buf[1], registers, REGISTER_BYTES);
 	      store_inferior_registers (-1);
 	      write_ok (own_buf);
 	      break;
 	    case 'm':
 	      decode_m_packet (&own_buf[1], &mem_addr, &len);
 	      read_inferior_memory (mem_addr, mem_buf, len);
 	      convert_int_to_ascii (mem_buf, own_buf, len);
 	      break;
 	    case 'M':
 	      decode_M_packet (&own_buf[1], &mem_addr, &len, mem_buf);
 	      if (write_inferior_memory (mem_addr, mem_buf, len) == 0)
 		write_ok (own_buf);
 	      else
 		write_enn (own_buf);
 	      break;
 	    case 'C':
 	      convert_ascii_to_int (own_buf + 1, &sig, 1);
 	      myresume (0, sig);
 	      signal = mywait (&status);
 	      prepare_resume_reply (own_buf, status, signal);
 	      break;
 	    case 'S':
 	      convert_ascii_to_int (own_buf + 1, &sig, 1);
 	      myresume (1, sig);
 	      signal = mywait (&status);
 	      prepare_resume_reply (own_buf, status, signal);
 	      break;
 	    case 'c':
 	      myresume (0, 0);
 	      signal = mywait (&status);
 	      prepare_resume_reply (own_buf, status, signal);
 	      break;
 	    case 's':
 	      myresume (1, 0);
 	      signal = mywait (&status);
 	      prepare_resume_reply (own_buf, status, signal);
 	      break;
 	    case 'k':
 	      fprintf (stderr, "Killing inferior\n");
 	      kill_inferior ();
 	      /* When using the extended protocol, we start up a new
 	         debugging session.   The traditional protocol will
 	         exit instead.  */
 	      if (extended_protocol)
 		{
 		  write_ok (own_buf);
 		  fprintf (stderr, "GDBserver restarting\n");

 		  /* Wait till we are at 1st instruction in prog.  */
 		  signal = start_inferior (&argv[2], &status);
 		  goto restart;
 		  break;
 		}
 	      else
 		{
 		  exit (0);
 		  break;
 		}
 	    case 'T':
 	      if (mythread_alive (strtol (&own_buf[1], NULL, 16)))
 		write_ok (own_buf);
 	      else
 		write_enn (own_buf);
 	      break;
 	    case 'R':
 	      /* Restarting the inferior is only supported in the
 	         extended protocol.  */
 	      if (extended_protocol)
 		{
 		  kill_inferior ();
 		  write_ok (own_buf);
 		  fprintf (stderr, "GDBserver restarting\n");

 		  /* Wait till we are at 1st instruction in prog.  */
 		  signal = start_inferior (&argv[2], &status);
 		  goto restart;
 		  break;
 		}
 	      else
 		{
 		  /* It is a request we don't understand.  Respond with an
 		     empty packet so that gdb knows that we don't support this
 		     request.  */
 		  own_buf[0] = '\0';
 		  break;
 		}
 	    default:
 	      /* It is a request we don't understand.  Respond with an
 	         empty packet so that gdb knows that we don't support this
 	         request.  */
 	      own_buf[0] = '\0';
 	      break;
 	    }

 	  putpkt (own_buf);

 	  if (status == 'W')
 	    fprintf (stderr,
 		     "\nChild exited with status %d\n", sig);
 	  if (status == 'X')
 	    fprintf (stderr, "\nChild terminated with signal = 0x%x\n", sig);
 	  if (status == 'W' || status == 'X')
 	    {
 	      if (extended_protocol)
 		{
 		  fprintf (stderr, "Killing inferior\n");
 		  kill_inferior ();
 		  write_ok (own_buf);
 		  fprintf (stderr, "GDBserver restarting\n");

 		  /* Wait till we are at 1st instruction in prog.  */
 		  signal = start_inferior (&argv[2], &status);
 		  goto restart;
 		  break;
 		}
 	      else
 		{
 		  fprintf (stderr, "GDBserver exiting\n");
 		  exit (0);
 		}
 	    }
 	}

       /* We come here when getpkt fails.

          For the extended remote protocol we exit (and this is the only
          way we gracefully exit!).

          For the traditional remote protocol close the connection,
          and re-open it at the top of the loop.  */
       if (extended_protocol)
 	{
 	  remote_close ();
 	  exit (0);
 	}
       else
 	{
 	  fprintf (stderr, "Remote side has terminated connection.  GDBserver will reopen the connection.\n");

 	  remote_close ();
 	}
     }
 }
	/* Main code for remote server for GDB.
	Copyright (C) 1989, 1993 Free Software Foundation, Inc.

	This file is part of GDB.

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 59 Temple Place - Suite 330,
	Boston, MA 02111-1307, USA. */

	#include "server.h"

	int cont_thread;
	int general_thread;
	int thread_from_wait;
	int old_thread_from_wait;
	int extended_protocol;
	jmp_buf toplevel;
	int inferior_pid;

	static unsigned char
	start_inferior (char argv[], char statusptr)
	{
	inferior_pid = create_inferior (argv[0], argv);
	fprintf (stderr, "Process %s created; pid = %d\n", argv[0], inferior_pid);

	/* Wait till we are at 1st instruction in program, return signal number. */
	return mywait (statusptr);
	}

	extern int remote_debug;

	int
	main (int argc, char *argv[])
	{
	char ch, status, own_buf[PBUFSIZ], mem_buf[2000];
	int i = 0;
	unsigned char signal;
	unsigned int len;
	CORE_ADDR mem_addr;

	if (setjmp (toplevel))
	{
	fprintf (stderr, "Exiting\n");
	exit (1);
	}

	if (argc < 3)
	error ("Usage: gdbserver tty prog [args ...]");

	initialize_low ();

	/* Wait till we are at first instruction in program. */
	signal = start_inferior (&argv[2], &status);

	/* We are now stopped at the first instruction of the target process */

	while (1)
	{
	remote_open (argv[1]);

	restart:
	setjmp (toplevel);
	while (getpkt (own_buf) > 0)
	{
	unsigned char sig;
	i = 0;
	ch = own_buf[i++];
	switch (ch)
	{
	case 'd':
	remote_debug = !remote_debug;
	break;
	case '!':
	extended_protocol = 1;
	prepare_resume_reply (own_buf, status, signal);
	break;
	case '?':
	prepare_resume_reply (own_buf, status, signal);
	break;
	case 'H':
	switch (own_buf[1])
	{
	case 'g':
	general_thread = strtol (&own_buf[2], NULL, 16);
	write_ok (own_buf);
	fetch_inferior_registers (0);
	break;
	case 'c':
	cont_thread = strtol (&own_buf[2], NULL, 16);
	write_ok (own_buf);
	break;
	default:
	/* Silently ignore it so that gdb can extend the protocol
	without compatibility headaches. */
	own_buf[0] = '\0';
	break;
	}
	break;
	case 'g':
	convert_int_to_ascii (registers, own_buf, REGISTER_BYTES);
	break;
	case 'G':
	convert_ascii_to_int (&own_buf[1], registers, REGISTER_BYTES);
	store_inferior_registers (-1);
	write_ok (own_buf);
	break;
	case 'm':
	decode_m_packet (&own_buf[1], &mem_addr, &len);
	read_inferior_memory (mem_addr, mem_buf, len);
	convert_int_to_ascii (mem_buf, own_buf, len);
	break;
	case 'M':
	decode_M_packet (&own_buf[1], &mem_addr, &len, mem_buf);
	if (write_inferior_memory (mem_addr, mem_buf, len) == 0)
	write_ok (own_buf);
	else
	write_enn (own_buf);
	break;
	case 'C':
	convert_ascii_to_int (own_buf + 1, &sig, 1);
	myresume (0, sig);
	signal = mywait (&status);
	prepare_resume_reply (own_buf, status, signal);
	break;
	case 'S':
	convert_ascii_to_int (own_buf + 1, &sig, 1);
	myresume (1, sig);
	signal = mywait (&status);
	prepare_resume_reply (own_buf, status, signal);
	break;
	case 'c':
	myresume (0, 0);
	signal = mywait (&status);
	prepare_resume_reply (own_buf, status, signal);
	break;
	case 's':
	myresume (1, 0);
	signal = mywait (&status);
	prepare_resume_reply (own_buf, status, signal);
	break;
	case 'k':
	fprintf (stderr, "Killing inferior\n");
	kill_inferior ();
	/* When using the extended protocol, we start up a new
	debugging session. The traditional protocol will
	exit instead. */
	if (extended_protocol)
	{
	write_ok (own_buf);
	fprintf (stderr, "GDBserver restarting\n");

	/* Wait till we are at 1st instruction in prog. */
	signal = start_inferior (&argv[2], &status);
	goto restart;
	break;
	}
	else
	{
	exit (0);
	break;
	}
	case 'T':
	if (mythread_alive (strtol (&own_buf[1], NULL, 16)))
	write_ok (own_buf);
	else
	write_enn (own_buf);
	break;
	case 'R':
	/* Restarting the inferior is only supported in the
	extended protocol. */
	if (extended_protocol)
	{
	kill_inferior ();
	write_ok (own_buf);
	fprintf (stderr, "GDBserver restarting\n");

	/* Wait till we are at 1st instruction in prog. */
	signal = start_inferior (&argv[2], &status);
	goto restart;
	break;
	}
	else
	{
	/* It is a request we don't understand. Respond with an
	empty packet so that gdb knows that we don't support this
	request. */
	own_buf[0] = '\0';
	break;
	}
	default:
	/* It is a request we don't understand. Respond with an
	empty packet so that gdb knows that we don't support this
	request. */
	own_buf[0] = '\0';
	break;
	}

	putpkt (own_buf);

	if (status == 'W')
	fprintf (stderr,
	"\nChild exited with status %d\n", sig);
	if (status == 'X')
	fprintf (stderr, "\nChild terminated with signal = 0x%x\n", sig);
	if (status == 'W' \|\| status == 'X')
	{
	if (extended_protocol)
	{
	fprintf (stderr, "Killing inferior\n");
	kill_inferior ();
	write_ok (own_buf);
	fprintf (stderr, "GDBserver restarting\n");

	/* Wait till we are at 1st instruction in prog. */
	signal = start_inferior (&argv[2], &status);
	goto restart;
	break;
	}
	else
	{
	fprintf (stderr, "GDBserver exiting\n");
	exit (0);
	}
	}
	}

	/* We come here when getpkt fails.

	For the extended remote protocol we exit (and this is the only
	way we gracefully exit!).

	For the traditional remote protocol close the connection,
	and re-open it at the top of the loop. */
	if (extended_protocol)
	{
	remote_close ();
	exit (0);
	}
	else
	{
	fprintf (stderr, "Remote side has terminated connection. GDBserver will reopen the connection.\n");

	remote_close ();
	}
	}
	}