623 lines
14 KiB
C
623 lines
14 KiB
C
/* Main code for remote server for GDB.
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Copyright 1989, 1993, 1994, 1995, 1997, 1998, 1999, 2000, 2002, 2003, 2004,
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2005
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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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#include <unistd.h>
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#include <signal.h>
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#include <sys/wait.h>
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unsigned long cont_thread;
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unsigned long general_thread;
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unsigned long step_thread;
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unsigned long thread_from_wait;
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unsigned long old_thread_from_wait;
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int extended_protocol;
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int server_waiting;
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jmp_buf toplevel;
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/* The PID of the originally created or attached inferior. Used to
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send signals to the process when GDB sends us an asynchronous interrupt
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(user hitting Control-C in the client), and to wait for the child to exit
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when no longer debugging it. */
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unsigned long signal_pid;
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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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signal (SIGTTOU, SIG_DFL);
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signal (SIGTTIN, SIG_DFL);
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signal_pid = create_inferior (argv[0], argv);
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fprintf (stderr, "Process %s created; pid = %ld\n", argv[0],
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signal_pid);
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signal (SIGTTOU, SIG_IGN);
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signal (SIGTTIN, SIG_IGN);
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tcsetpgrp (fileno (stderr), 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, 0);
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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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fprintf (stderr, "Attached; pid = %d\n", pid);
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/* FIXME - It may be that we should get the SIGNAL_PID from the
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attach function, so that it can be the main thread instead of
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whichever we were told to attach to. */
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signal_pid = pid;
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*sigptr = mywait (statusptr, 0);
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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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static struct inferior_list_entry *thread_ptr;
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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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if (strcmp ("qfThreadInfo", own_buf) == 0)
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{
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thread_ptr = all_threads.head;
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sprintf (own_buf, "m%lx", thread_ptr->id);
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thread_ptr = thread_ptr->next;
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return;
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}
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if (strcmp ("qsThreadInfo", own_buf) == 0)
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{
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if (thread_ptr != NULL)
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{
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sprintf (own_buf, "m%lx", thread_ptr->id);
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thread_ptr = thread_ptr->next;
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return;
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}
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else
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{
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sprintf (own_buf, "l");
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return;
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}
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}
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if (the_target->read_auxv != NULL
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&& strncmp ("qPart:auxv:read::", own_buf, 17) == 0)
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{
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char data[(PBUFSIZ - 1) / 2];
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CORE_ADDR ofs;
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unsigned int len;
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int n;
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decode_m_packet (&own_buf[17], &ofs, &len); /* "OFS,LEN" */
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if (len > sizeof data)
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len = sizeof data;
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n = (*the_target->read_auxv) (ofs, data, len);
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if (n == 0)
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write_ok (own_buf);
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else if (n < 0)
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write_enn (own_buf);
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else
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convert_int_to_ascii (data, own_buf, n);
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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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/* Parse vCont packets. */
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void
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handle_v_cont (char *own_buf, char *status, unsigned char *signal)
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{
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char *p, *q;
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int n = 0, i = 0;
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struct thread_resume *resume_info, default_action;
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/* Count the number of semicolons in the packet. There should be one
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for every action. */
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p = &own_buf[5];
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while (p)
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{
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n++;
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p++;
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p = strchr (p, ';');
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}
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/* Allocate room for one extra action, for the default remain-stopped
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behavior; if no default action is in the list, we'll need the extra
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slot. */
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resume_info = malloc ((n + 1) * sizeof (resume_info[0]));
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default_action.thread = -1;
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default_action.leave_stopped = 1;
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default_action.step = 0;
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default_action.sig = 0;
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p = &own_buf[5];
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i = 0;
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while (*p)
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{
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p++;
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resume_info[i].leave_stopped = 0;
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if (p[0] == 's' || p[0] == 'S')
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resume_info[i].step = 1;
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else if (p[0] == 'c' || p[0] == 'C')
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resume_info[i].step = 0;
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else
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goto err;
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if (p[0] == 'S' || p[0] == 'C')
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{
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int sig;
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sig = strtol (p + 1, &q, 16);
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if (p == q)
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goto err;
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p = q;
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if (!target_signal_to_host_p (sig))
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goto err;
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resume_info[i].sig = target_signal_to_host (sig);
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}
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else
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{
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resume_info[i].sig = 0;
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p = p + 1;
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}
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if (p[0] == 0)
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{
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resume_info[i].thread = -1;
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default_action = resume_info[i];
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/* Note: we don't increment i here, we'll overwrite this entry
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the next time through. */
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}
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else if (p[0] == ':')
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{
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resume_info[i].thread = strtoul (p + 1, &q, 16);
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if (p == q)
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goto err;
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p = q;
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if (p[0] != ';' && p[0] != 0)
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goto err;
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i++;
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}
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}
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resume_info[i] = default_action;
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/* Still used in occasional places in the backend. */
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if (n == 1 && resume_info[0].thread != -1)
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cont_thread = resume_info[0].thread;
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else
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cont_thread = -1;
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set_desired_inferior (0);
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(*the_target->resume) (resume_info);
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free (resume_info);
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*signal = mywait (status, 1);
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prepare_resume_reply (own_buf, *status, *signal);
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return;
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err:
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/* No other way to report an error... */
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strcpy (own_buf, "");
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free (resume_info);
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return;
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}
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/* Handle all of the extended 'v' packets. */
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void
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handle_v_requests (char *own_buf, char *status, unsigned char *signal)
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{
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if (strncmp (own_buf, "vCont;", 6) == 0)
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{
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handle_v_cont (own_buf, status, signal);
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return;
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}
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if (strncmp (own_buf, "vCont?", 6) == 0)
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{
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strcpy (own_buf, "vCont;c;C;s;S");
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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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return;
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}
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void
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myresume (int step, int sig)
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{
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struct thread_resume resume_info[2];
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int n = 0;
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if (step || sig || cont_thread > 0)
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{
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resume_info[0].thread
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= ((struct inferior_list_entry *) current_inferior)->id;
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resume_info[0].step = step;
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resume_info[0].sig = sig;
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resume_info[0].leave_stopped = 0;
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n++;
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}
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resume_info[n].thread = -1;
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resume_info[n].step = 0;
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resume_info[n].sig = 0;
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resume_info[n].leave_stopped = (cont_thread > 0);
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(*the_target->resume) (resume_info);
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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 'D':
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fprintf (stderr, "Detaching from inferior\n");
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detach_inferior ();
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write_ok (own_buf);
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putpkt (own_buf);
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remote_close ();
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/* If we are attached, then we can exit. Otherwise, we need to
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hang around doing nothing, until the child is gone. */
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if (!attached)
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{
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int status, ret;
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do {
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ret = waitpid (signal_pid, &status, 0);
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if (WIFEXITED (status) || WIFSIGNALED (status))
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break;
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} while (ret != -1 || errno != ECHILD);
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}
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exit (0);
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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 = strtoul (&own_buf[2], NULL, 16);
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write_ok (own_buf);
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set_desired_inferior (1);
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break;
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case 'c':
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cont_thread = strtoul (&own_buf[2], NULL, 16);
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write_ok (own_buf);
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break;
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case 's':
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step_thread = strtoul (&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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set_desired_inferior (1);
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registers_to_string (own_buf);
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break;
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|
case 'G':
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set_desired_inferior (1);
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registers_from_string (&own_buf[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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if (read_inferior_memory (mem_addr, mem_buf, len) == 0)
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convert_int_to_ascii (mem_buf, own_buf, len);
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else
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write_enn (own_buf);
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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);
|
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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 (strtoul (&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;
|
|
}
|
|
case 'v':
|
|
/* Extended (long) request. */
|
|
handle_v_requests (own_buf, &status, &signal);
|
|
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", signal);
|
|
if (status == 'X')
|
|
fprintf (stderr, "\nChild terminated with signal = 0x%x\n",
|
|
signal);
|
|
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 ();
|
|
}
|
|
}
|
|
}
|