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/* 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"

#include <unistd.h>

#include <signal.h>

#include <sys/wait.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;

/* The PID of the originally created or attached inferior.  Used to

   send signals to the process when GDB sends us an asynchronous interrupt

   (user hitting Control-C in the client), and to wait for the child to exit

   when no longer debugging it.  */

int signal_pid;

static unsigned char

start_inferior (char *argv[], char *statusptr)

{

  signal (SIGTTOU, SIG_DFL);

  signal (SIGTTIN, SIG_DFL);

  signal_pid = create_inferior (argv[0], argv);

  fprintf (stderr, "Process %s created; pid = %d\n", argv[0],

           signal_pid);

  signal (SIGTTOU, SIG_IGN);

  signal (SIGTTIN, SIG_IGN);

  tcsetpgrp (fileno (stderr), signal_pid);

  /* 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,

  if (myattach (pid) != 0)

    return -1;

  /* FIXME - It may be that we should get the SIGNAL_PID from the

     attach function, so that it can be the main thread instead of

     whichever we were told to attach to.  */

  signal_pid = pid;

  *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 ();

        }

    }

}