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/* Main code for remote server for GDB.

   Copyright 1989, 1993, 1994, 1995, 1997, 1998, 1999, 2000

   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 ();

        }

    }

}