0bc68c4948
From Martin Pool <mbp@samba.org>:
* gdbserver/server.c (gdbserver_usage): New function.
(main): Call it.
360 lines
8.6 KiB
C
360 lines
8.6 KiB
C
/* Main code for remote server for GDB.
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Copyright 1989, 1993, 1994, 1995, 1997, 1998, 1999, 2000, 2002
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Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "server.h"
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int cont_thread;
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int general_thread;
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int thread_from_wait;
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int old_thread_from_wait;
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int extended_protocol;
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jmp_buf toplevel;
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static unsigned char
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start_inferior (char *argv[], char *statusptr)
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{
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/* FIXME Check error? Or turn to void. */
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create_inferior (argv[0], argv);
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/* FIXME Print pid properly. */
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fprintf (stderr, "Process %s created; pid = %d\n", argv[0], signal_pid);
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/* Wait till we are at 1st instruction in program, return signal number. */
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return mywait (statusptr);
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}
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static int
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attach_inferior (int pid, char *statusptr, unsigned char *sigptr)
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{
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/* myattach should return -1 if attaching is unsupported,
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0 if it succeeded, and call error() otherwise. */
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if (myattach (pid) != 0)
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return -1;
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*sigptr = mywait (statusptr);
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return 0;
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}
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extern int remote_debug;
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/* Handle all of the extended 'q' packets. */
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void
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handle_query (char *own_buf)
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{
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if (strcmp ("qSymbol::", own_buf) == 0)
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{
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if (the_target->look_up_symbols != NULL)
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(*the_target->look_up_symbols) ();
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strcpy (own_buf, "OK");
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return;
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}
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/* Otherwise we didn't know what packet it was. Say we didn't
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understand it. */
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own_buf[0] = 0;
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}
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static int attached;
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static void
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gdbserver_usage (void)
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{
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error ("Usage:\tgdbserver COMM PROG [ARGS ...]\n"
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"\tgdbserver COMM --attach PID\n"
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"\n"
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"COMM may either be a tty device (for serial debugging), or \n"
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"HOST:PORT to listen for a TCP connection.\n");
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}
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int
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main (int argc, char *argv[])
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{
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char ch, status, *own_buf, mem_buf[2000];
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int i = 0;
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unsigned char signal;
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unsigned int len;
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CORE_ADDR mem_addr;
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int bad_attach;
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int pid;
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char *arg_end;
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if (setjmp (toplevel))
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{
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fprintf (stderr, "Exiting\n");
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exit (1);
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}
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bad_attach = 0;
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pid = 0;
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attached = 0;
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if (argc >= 3 && strcmp (argv[2], "--attach") == 0)
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{
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if (argc == 4
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&& argv[3] != '\0'
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&& (pid = strtoul (argv[3], &arg_end, 10)) != 0
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&& *arg_end == '\0')
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{
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;
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}
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else
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bad_attach = 1;
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}
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if (argc < 3 || bad_attach)
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gdbserver_usage();
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initialize_low ();
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own_buf = malloc (PBUFSIZ);
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if (pid == 0)
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{
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/* Wait till we are at first instruction in program. */
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signal = start_inferior (&argv[2], &status);
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/* We are now stopped at the first instruction of the target process */
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}
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else
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{
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switch (attach_inferior (pid, &status, &signal))
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{
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case -1:
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error ("Attaching not supported on this target");
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break;
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default:
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attached = 1;
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break;
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}
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}
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while (1)
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{
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remote_open (argv[1]);
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restart:
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setjmp (toplevel);
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while (getpkt (own_buf) > 0)
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{
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unsigned char sig;
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i = 0;
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ch = own_buf[i++];
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switch (ch)
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{
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case 'q':
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handle_query (own_buf);
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break;
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case 'd':
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remote_debug = !remote_debug;
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break;
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case '!':
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if (attached == 0)
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{
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extended_protocol = 1;
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prepare_resume_reply (own_buf, status, signal);
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}
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else
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{
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/* We can not use the extended protocol if we are
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attached, because we can not restart the running
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program. So return unrecognized. */
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own_buf[0] = '\0';
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}
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break;
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case '?':
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prepare_resume_reply (own_buf, status, signal);
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break;
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case 'H':
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switch (own_buf[1])
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{
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case 'g':
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general_thread = strtol (&own_buf[2], NULL, 16);
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write_ok (own_buf);
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fetch_inferior_registers (0);
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break;
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case 'c':
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cont_thread = strtol (&own_buf[2], NULL, 16);
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write_ok (own_buf);
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break;
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default:
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/* Silently ignore it so that gdb can extend the protocol
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without compatibility headaches. */
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own_buf[0] = '\0';
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break;
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}
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break;
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case 'g':
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registers_to_string (own_buf);
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break;
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case 'G':
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registers_from_string (&own_buf[1]);
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store_inferior_registers (-1);
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write_ok (own_buf);
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break;
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case 'm':
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decode_m_packet (&own_buf[1], &mem_addr, &len);
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read_inferior_memory (mem_addr, mem_buf, len);
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convert_int_to_ascii (mem_buf, own_buf, len);
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break;
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case 'M':
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decode_M_packet (&own_buf[1], &mem_addr, &len, mem_buf);
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if (write_inferior_memory (mem_addr, mem_buf, len) == 0)
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write_ok (own_buf);
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else
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write_enn (own_buf);
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break;
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case 'C':
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convert_ascii_to_int (own_buf + 1, &sig, 1);
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if (target_signal_to_host_p (sig))
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signal = target_signal_to_host (sig);
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else
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signal = 0;
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myresume (0, signal);
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signal = mywait (&status);
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prepare_resume_reply (own_buf, status, signal);
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break;
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case 'S':
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convert_ascii_to_int (own_buf + 1, &sig, 1);
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if (target_signal_to_host_p (sig))
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signal = target_signal_to_host (sig);
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else
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signal = 0;
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myresume (1, signal);
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signal = mywait (&status);
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prepare_resume_reply (own_buf, status, signal);
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break;
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case 'c':
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myresume (0, 0);
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signal = mywait (&status);
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prepare_resume_reply (own_buf, status, signal);
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break;
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case 's':
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myresume (1, 0);
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signal = mywait (&status);
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prepare_resume_reply (own_buf, status, signal);
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break;
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case 'k':
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fprintf (stderr, "Killing inferior\n");
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kill_inferior ();
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/* When using the extended protocol, we start up a new
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debugging session. The traditional protocol will
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exit instead. */
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if (extended_protocol)
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{
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write_ok (own_buf);
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fprintf (stderr, "GDBserver restarting\n");
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/* Wait till we are at 1st instruction in prog. */
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signal = start_inferior (&argv[2], &status);
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goto restart;
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break;
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}
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else
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{
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exit (0);
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break;
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}
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case 'T':
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if (mythread_alive (strtol (&own_buf[1], NULL, 16)))
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write_ok (own_buf);
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else
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write_enn (own_buf);
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break;
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case 'R':
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/* Restarting the inferior is only supported in the
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extended protocol. */
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if (extended_protocol)
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{
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kill_inferior ();
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write_ok (own_buf);
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fprintf (stderr, "GDBserver restarting\n");
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/* Wait till we are at 1st instruction in prog. */
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signal = start_inferior (&argv[2], &status);
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goto restart;
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break;
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}
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else
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{
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/* It is a request we don't understand. Respond with an
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empty packet so that gdb knows that we don't support this
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request. */
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own_buf[0] = '\0';
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break;
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}
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default:
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/* It is a request we don't understand. Respond with an
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empty packet so that gdb knows that we don't support this
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request. */
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own_buf[0] = '\0';
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break;
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}
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putpkt (own_buf);
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if (status == 'W')
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fprintf (stderr,
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"\nChild exited with status %d\n", sig);
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if (status == 'X')
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fprintf (stderr, "\nChild terminated with signal = 0x%x\n", sig);
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if (status == 'W' || status == 'X')
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{
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if (extended_protocol)
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{
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fprintf (stderr, "Killing inferior\n");
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kill_inferior ();
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write_ok (own_buf);
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fprintf (stderr, "GDBserver restarting\n");
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/* Wait till we are at 1st instruction in prog. */
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signal = start_inferior (&argv[2], &status);
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goto restart;
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break;
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}
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else
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{
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fprintf (stderr, "GDBserver exiting\n");
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exit (0);
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}
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}
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}
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/* We come here when getpkt fails.
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For the extended remote protocol we exit (and this is the only
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way we gracefully exit!).
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For the traditional remote protocol close the connection,
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and re-open it at the top of the loop. */
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if (extended_protocol)
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{
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remote_close ();
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exit (0);
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}
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else
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{
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fprintf (stderr, "Remote side has terminated connection. "
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"GDBserver will reopen the connection.\n");
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remote_close ();
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}
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}
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}
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