[deliverable/binutils-gdb.git] / gdb / gdbserver / server.c

/* Main code for remote server for GDB.
   Copyright 1989, 1993, 1994, 1995, 1997, 1998, 1999, 2000, 2002
   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 step_thread;
int thread_from_wait;
int old_thread_from_wait;
int extended_protocol;
int server_waiting;

jmp_buf toplevel;

static unsigned char
start_inferior (char *argv[], char *statusptr)
{
  /* FIXME Check error? Or turn to void.  */
  create_inferior (argv[0], argv);

  fprintf (stderr, "Process %s created; pid = %d\n", argv[0],
	   all_threads.head->id);

  /* Wait till we are at 1st instruction in program, return signal number.  */
  return mywait (statusptr, 0);
}

static int
attach_inferior (int pid, char *statusptr, unsigned char *sigptr)
{
  /* myattach should return -1 if attaching is unsupported,
     0 if it succeeded, and call error() otherwise.  */
  if (myattach (pid) != 0)
    return -1;

  *sigptr = mywait (statusptr, 0);

  return 0;
}

extern int remote_debug;

/* Handle all of the extended 'q' packets.  */
void
handle_query (char *own_buf)
{
  static struct inferior_list_entry *thread_ptr;

  if (strcmp ("qSymbol::", own_buf) == 0)
    {
      if (the_target->look_up_symbols != NULL)
	(*the_target->look_up_symbols) ();

      strcpy (own_buf, "OK");
      return;
    }

  if (strcmp ("qfThreadInfo", own_buf) == 0)
    {
      thread_ptr = all_threads.head;
      sprintf (own_buf, "m%x", thread_ptr->id);
      thread_ptr = thread_ptr->next;
      return;
    }
  
  if (strcmp ("qsThreadInfo", own_buf) == 0)
    {
      if (thread_ptr != NULL)
	{
	  sprintf (own_buf, "m%x", thread_ptr->id);
	  thread_ptr = thread_ptr->next;
	  return;
	}
      else
	{
	  sprintf (own_buf, "l");
	  return;
	}
    }
      
  /* Otherwise we didn't know what packet it was.  Say we didn't
     understand it.  */
  own_buf[0] = 0;
}

static int attached;

static void
gdbserver_usage (void)
{
  error ("Usage:\tgdbserver COMM PROG [ARGS ...]\n"
	 "\tgdbserver COMM --attach PID\n"
	 "\n"
	 "COMM may either be a tty device (for serial debugging), or \n"
	 "HOST:PORT to listen for a TCP connection.\n");
}

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

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

  bad_attach = 0;
  pid = 0;
  attached = 0;
  if (argc >= 3 && strcmp (argv[2], "--attach") == 0)
    {
      if (argc == 4
	  && argv[3] != '\0'
	  && (pid = strtoul (argv[3], &arg_end, 10)) != 0
	  && *arg_end == '\0')
	{
	  ;
	}
      else
	bad_attach = 1;
    }

  if (argc < 3 || bad_attach)
    gdbserver_usage();

  initialize_low ();

  own_buf = malloc (PBUFSIZ);

  if (pid == 0)
    {
      /* 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 */
    }
  else
    {
      switch (attach_inferior (pid, &status, &signal))
	{
	case -1:
	  error ("Attaching not supported on this target");
	  break;
	default:
	  attached = 1;
	  break;
	}
    }

  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 'q':
	      handle_query (own_buf);
	      break;
	    case 'd':
	      remote_debug = !remote_debug;
	      break;
	    case '!':
	      if (attached == 0)
		{
		  extended_protocol = 1;
		  prepare_resume_reply (own_buf, status, signal);
		}
	      else
		{
		  /* We can not use the extended protocol if we are
		     attached, because we can not restart the running
		     program.  So return unrecognized.  */
		  own_buf[0] = '\0';
		}
	      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);
		  set_desired_inferior (1);
		  break;
		case 'c':
		  cont_thread = strtol (&own_buf[2], NULL, 16);
		  write_ok (own_buf);
		  break;
		case 's':
		  step_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':
	      set_desired_inferior (1);
	      registers_to_string (own_buf);
	      break;
	    case 'G':
	      set_desired_inferior (1);
	      registers_from_string (&own_buf[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);
	      if (target_signal_to_host_p (sig))
		signal = target_signal_to_host (sig);
	      else
		signal = 0;
	      set_desired_inferior (0);
	      myresume (0, signal);
	      signal = mywait (&status, 1);
	      prepare_resume_reply (own_buf, status, signal);
	      break;
	    case 'S':
	      convert_ascii_to_int (own_buf + 1, &sig, 1);
	      if (target_signal_to_host_p (sig))
		signal = target_signal_to_host (sig);
	      else
		signal = 0;
	      set_desired_inferior (0);
	      myresume (1, signal);
	      signal = mywait (&status, 1);
	      prepare_resume_reply (own_buf, status, signal);
	      break;
	    case 'c':
	      set_desired_inferior (0);
	      myresume (0, 0);
	      signal = mywait (&status, 1);
	      prepare_resume_reply (own_buf, status, signal);
	      break;
	    case 's':
	      set_desired_inferior (0);
	      myresume (1, 0);
	      signal = mywait (&status, 1);
	      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 ();
	}
    }
}
Commit	Line	Data
c906108c	1	/* Main code for remote server for GDB.
db728ff7	2	Copyright 1989, 1993, 1994, 1995, 1997, 1998, 1999, 2000, 2002
b6ba6518	3	Free Software Foundation, Inc.
c906108c	4
c5aa993b	5	This file is part of GDB.
c906108c	6
c5aa993b JM	7	This program is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
	9	the Free Software Foundation; either version 2 of the License, or
	10	(at your option) any later version.
c906108c	11
c5aa993b JM	12	This program is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
c906108c	16
c5aa993b JM	17	You should have received a copy of the GNU General Public License
	18	along with this program; if not, write to the Free Software
	19	Foundation, Inc., 59 Temple Place - Suite 330,
	20	Boston, MA 02111-1307, USA. */
c906108c SS	21
	22	#include "server.h"
	23
	24	int cont_thread;
	25	int general_thread;
0d62e5e8	26	int step_thread;
c906108c SS	27	int thread_from_wait;
	28	int old_thread_from_wait;
	29	int extended_protocol;
0d62e5e8 DJ	30	int server_waiting;
0d62e5e8 DJ	31
c906108c	32	jmp_buf toplevel;
c906108c SS	33
c906108c SS	34	static unsigned char
da85418c	35	start_inferior (char argv[], char statusptr)
c906108c	36	{
ce3a066d DJ	37	/* FIXME Check error? Or turn to void. */
ce3a066d DJ	38	create_inferior (argv[0], argv);
0d62e5e8 DJ	39
	40	fprintf (stderr, "Process %s created; pid = %d\n", argv[0],
	41	all_threads.head->id);
c906108c SS	42
c906108c SS	43	/* Wait till we are at 1st instruction in program, return signal number. */
0d62e5e8	44	return mywait (statusptr, 0);
c906108c SS	45	}
c906108c SS	46
45b7b345 DJ	47	static int
	48	attach_inferior (int pid, char statusptr, unsigned char sigptr)
	49	{
	50	/* myattach should return -1 if attaching is unsupported,
	51	0 if it succeeded, and call error() otherwise. */
	52	if (myattach (pid) != 0)
	53	return -1;
	54
0d62e5e8	55	*sigptr = mywait (statusptr, 0);
45b7b345 DJ	56
	57	return 0;
	58	}
	59
c906108c	60	extern int remote_debug;
ce3a066d DJ	61
	62	/* Handle all of the extended 'q' packets. */
	63	void
	64	handle_query (char *own_buf)
	65	{
0d62e5e8 DJ	66	static struct inferior_list_entry *thread_ptr;
0d62e5e8 DJ	67
ce3a066d DJ	68	if (strcmp ("qSymbol::", own_buf) == 0)
ce3a066d DJ	69	{
2f2893d9 DJ	70	if (the_target->look_up_symbols != NULL)
	71	(*the_target->look_up_symbols) ();
	72
ce3a066d DJ	73	strcpy (own_buf, "OK");
	74	return;
	75	}
	76
0d62e5e8 DJ	77	if (strcmp ("qfThreadInfo", own_buf) == 0)
	78	{
	79	thread_ptr = all_threads.head;
	80	sprintf (own_buf, "m%x", thread_ptr->id);
	81	thread_ptr = thread_ptr->next;
	82	return;
	83	}
	84
	85	if (strcmp ("qsThreadInfo", own_buf) == 0)
	86	{
	87	if (thread_ptr != NULL)
	88	{
	89	sprintf (own_buf, "m%x", thread_ptr->id);
	90	thread_ptr = thread_ptr->next;
	91	return;
	92	}
	93	else
	94	{
	95	sprintf (own_buf, "l");
	96	return;
	97	}
	98	}
	99
ce3a066d DJ	100	/* Otherwise we didn't know what packet it was. Say we didn't
	101	understand it. */
	102	own_buf[0] = 0;
	103	}
	104
0729219d	105	static int attached;
c906108c	106
0bc68c49 DJ	107	static void
	108	gdbserver_usage (void)
	109	{
	110	error ("Usage:\tgdbserver COMM PROG [ARGS ...]\n"
	111	"\tgdbserver COMM --attach PID\n"
	112	"\n"
	113	"COMM may either be a tty device (for serial debugging), or \n"
	114	"HOST:PORT to listen for a TCP connection.\n");
	115	}
	116
c906108c	117	int
da85418c	118	main (int argc, char *argv[])
c906108c	119	{
0a30fbc4	120	char ch, status, *own_buf, mem_buf[2000];
c906108c SS	121	int i = 0;
	122	unsigned char signal;
	123	unsigned int len;
	124	CORE_ADDR mem_addr;
0729219d DJ	125	int bad_attach;
0729219d DJ	126	int pid;
45b7b345	127	char *arg_end;
c906108c	128
c5aa993b	129	if (setjmp (toplevel))
c906108c	130	{
c5aa993b JM	131	fprintf (stderr, "Exiting\n");
c5aa993b JM	132	exit (1);
c906108c SS	133	}
c906108c SS	134
0729219d DJ	135	bad_attach = 0;
	136	pid = 0;
	137	attached = 0;
45b7b345 DJ	138	if (argc >= 3 && strcmp (argv[2], "--attach") == 0)
	139	{
	140	if (argc == 4
	141	&& argv[3] != '\0'
	142	&& (pid = strtoul (argv[3], &arg_end, 10)) != 0
	143	&& *arg_end == '\0')
	144	{
	145	;
	146	}
	147	else
	148	bad_attach = 1;
	149	}
	150
	151	if (argc < 3 \|\| bad_attach)
0bc68c49	152	gdbserver_usage();
c906108c	153
4ce44c66 JM	154	initialize_low ();
4ce44c66 JM	155
0a30fbc4 DJ	156	own_buf = malloc (PBUFSIZ);
0a30fbc4 DJ	157
45b7b345 DJ	158	if (pid == 0)
	159	{
	160	/* Wait till we are at first instruction in program. */
	161	signal = start_inferior (&argv[2], &status);
c906108c	162
45b7b345 DJ	163	/* We are now stopped at the first instruction of the target process */
	164	}
	165	else
	166	{
	167	switch (attach_inferior (pid, &status, &signal))
	168	{
	169	case -1:
	170	error ("Attaching not supported on this target");
	171	break;
	172	default:
	173	attached = 1;
	174	break;
	175	}
	176	}
c906108c SS	177
	178	while (1)
	179	{
	180	remote_open (argv[1]);
	181
c5aa993b JM	182	restart:
c5aa993b JM	183	setjmp (toplevel);
c906108c SS	184	while (getpkt (own_buf) > 0)
	185	{
	186	unsigned char sig;
	187	i = 0;
	188	ch = own_buf[i++];
	189	switch (ch)
	190	{
ce3a066d DJ	191	case 'q':
	192	handle_query (own_buf);
	193	break;
c906108c SS	194	case 'd':
	195	remote_debug = !remote_debug;
	196	break;
	197	case '!':
45b7b345 DJ	198	if (attached == 0)
	199	{
	200	extended_protocol = 1;
	201	prepare_resume_reply (own_buf, status, signal);
	202	}
	203	else
	204	{
	205	/* We can not use the extended protocol if we are
	206	attached, because we can not restart the running
	207	program. So return unrecognized. */
	208	own_buf[0] = '\0';
	209	}
c906108c SS	210	break;
	211	case '?':
	212	prepare_resume_reply (own_buf, status, signal);
	213	break;
	214	case 'H':
	215	switch (own_buf[1])
	216	{
	217	case 'g':
	218	general_thread = strtol (&own_buf[2], NULL, 16);
	219	write_ok (own_buf);
0d62e5e8	220	set_desired_inferior (1);
c906108c SS	221	break;
	222	case 'c':
	223	cont_thread = strtol (&own_buf[2], NULL, 16);
	224	write_ok (own_buf);
	225	break;
0d62e5e8 DJ	226	case 's':
	227	step_thread = strtol (&own_buf[2], NULL, 16);
	228	write_ok (own_buf);
	229	break;
c906108c SS	230	default:
	231	/* Silently ignore it so that gdb can extend the protocol
	232	without compatibility headaches. */
	233	own_buf[0] = '\0';
	234	break;
	235	}
	236	break;
	237	case 'g':
0d62e5e8	238	set_desired_inferior (1);
0a30fbc4	239	registers_to_string (own_buf);
c906108c SS	240	break;
c906108c SS	241	case 'G':
0d62e5e8	242	set_desired_inferior (1);
0a30fbc4	243	registers_from_string (&own_buf[1]);
c906108c SS	244	write_ok (own_buf);
	245	break;
	246	case 'm':
	247	decode_m_packet (&own_buf[1], &mem_addr, &len);
	248	read_inferior_memory (mem_addr, mem_buf, len);
	249	convert_int_to_ascii (mem_buf, own_buf, len);
	250	break;
	251	case 'M':
	252	decode_M_packet (&own_buf[1], &mem_addr, &len, mem_buf);
	253	if (write_inferior_memory (mem_addr, mem_buf, len) == 0)
	254	write_ok (own_buf);
	255	else
	256	write_enn (own_buf);
	257	break;
	258	case 'C':
	259	convert_ascii_to_int (own_buf + 1, &sig, 1);
0e98d0a7 DJ	260	if (target_signal_to_host_p (sig))
	261	signal = target_signal_to_host (sig);
	262	else
	263	signal = 0;
0d62e5e8	264	set_desired_inferior (0);
0e98d0a7	265	myresume (0, signal);
0d62e5e8	266	signal = mywait (&status, 1);
c906108c SS	267	prepare_resume_reply (own_buf, status, signal);
	268	break;
	269	case 'S':
	270	convert_ascii_to_int (own_buf + 1, &sig, 1);
0e98d0a7 DJ	271	if (target_signal_to_host_p (sig))
	272	signal = target_signal_to_host (sig);
	273	else
	274	signal = 0;
0d62e5e8	275	set_desired_inferior (0);
0e98d0a7	276	myresume (1, signal);
0d62e5e8	277	signal = mywait (&status, 1);
c906108c SS	278	prepare_resume_reply (own_buf, status, signal);
	279	break;
	280	case 'c':
0d62e5e8	281	set_desired_inferior (0);
c906108c	282	myresume (0, 0);
0d62e5e8	283	signal = mywait (&status, 1);
c906108c SS	284	prepare_resume_reply (own_buf, status, signal);
	285	break;
	286	case 's':
0d62e5e8	287	set_desired_inferior (0);
c906108c	288	myresume (1, 0);
0d62e5e8	289	signal = mywait (&status, 1);
c906108c SS	290	prepare_resume_reply (own_buf, status, signal);
	291	break;
	292	case 'k':
	293	fprintf (stderr, "Killing inferior\n");
	294	kill_inferior ();
	295	/* When using the extended protocol, we start up a new
c5aa993b	296	debugging session. The traditional protocol will
c906108c SS	297	exit instead. */
	298	if (extended_protocol)
	299	{
	300	write_ok (own_buf);
	301	fprintf (stderr, "GDBserver restarting\n");
	302
	303	/* Wait till we are at 1st instruction in prog. */
	304	signal = start_inferior (&argv[2], &status);
	305	goto restart;
	306	break;
	307	}
	308	else
	309	{
	310	exit (0);
	311	break;
	312	}
	313	case 'T':
	314	if (mythread_alive (strtol (&own_buf[1], NULL, 16)))
	315	write_ok (own_buf);
	316	else
	317	write_enn (own_buf);
	318	break;
	319	case 'R':
	320	/* Restarting the inferior is only supported in the
c5aa993b	321	extended protocol. */
c906108c SS	322	if (extended_protocol)
	323	{
	324	kill_inferior ();
	325	write_ok (own_buf);
	326	fprintf (stderr, "GDBserver restarting\n");
	327
	328	/* Wait till we are at 1st instruction in prog. */
	329	signal = start_inferior (&argv[2], &status);
	330	goto restart;
	331	break;
	332	}
	333	else
	334	{
	335	/* It is a request we don't understand. Respond with an
	336	empty packet so that gdb knows that we don't support this
	337	request. */
	338	own_buf[0] = '\0';
	339	break;
	340	}
	341	default:
	342	/* It is a request we don't understand. Respond with an
c5aa993b JM	343	empty packet so that gdb knows that we don't support this
c5aa993b JM	344	request. */
c906108c SS	345	own_buf[0] = '\0';
	346	break;
	347	}
	348
	349	putpkt (own_buf);
	350
	351	if (status == 'W')
	352	fprintf (stderr,
	353	"\nChild exited with status %d\n", sig);
	354	if (status == 'X')
	355	fprintf (stderr, "\nChild terminated with signal = 0x%x\n", sig);
	356	if (status == 'W' \|\| status == 'X')
	357	{
	358	if (extended_protocol)
	359	{
	360	fprintf (stderr, "Killing inferior\n");
	361	kill_inferior ();
	362	write_ok (own_buf);
	363	fprintf (stderr, "GDBserver restarting\n");
	364
	365	/* Wait till we are at 1st instruction in prog. */
	366	signal = start_inferior (&argv[2], &status);
	367	goto restart;
	368	break;
	369	}
	370	else
	371	{
	372	fprintf (stderr, "GDBserver exiting\n");
	373	exit (0);
	374	}
	375	}
	376	}
	377
	378	/* We come here when getpkt fails.
	379
c5aa993b JM	380	For the extended remote protocol we exit (and this is the only
c5aa993b JM	381	way we gracefully exit!).
c906108c	382
c5aa993b JM	383	For the traditional remote protocol close the connection,
c5aa993b JM	384	and re-open it at the top of the loop. */
c906108c SS	385	if (extended_protocol)
	386	{
	387	remote_close ();
	388	exit (0);
	389	}
	390	else
	391	{
45b7b345 DJ	392	fprintf (stderr, "Remote side has terminated connection. "
45b7b345 DJ	393	"GDBserver will reopen the connection.\n");
c906108c SS	394	remote_close ();
	395	}
	396	}
	397	}