| /* Main code for remote server for GDB. |
| Copyright 1989, 1993, 1994, 1995, 1997, 1998, 1999, 2000, 2002, 2003, 2004 |
| 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, |
| 0 if it succeeded, and call error() otherwise. */ |
| |
| if (myattach (pid) != 0) |
| return -1; |
| |
| fprintf (stderr, "Attached; pid = %d\n", pid); |
| |
| /* 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; |
| } |
| } |
| |
| if (the_target->read_auxv != NULL |
| && strncmp ("qPart:auxv:read::", own_buf, 17) == 0) |
| { |
| char data[(PBUFSIZ - 1) / 2]; |
| CORE_ADDR ofs; |
| unsigned int len; |
| int n; |
| decode_m_packet (&own_buf[17], &ofs, &len); /* "OFS,LEN" */ |
| if (len > sizeof data) |
| len = sizeof data; |
| n = (*the_target->read_auxv) (ofs, data, len); |
| if (n == 0) |
| write_ok (own_buf); |
| else if (n < 0) |
| write_enn (own_buf); |
| else |
| convert_int_to_ascii (data, own_buf, n); |
| return; |
| } |
| |
| /* Otherwise we didn't know what packet it was. Say we didn't |
| understand it. */ |
| own_buf[0] = 0; |
| } |
| |
| /* Parse vCont packets. */ |
| void |
| handle_v_cont (char *own_buf, char *status, unsigned char *signal) |
| { |
| char *p, *q; |
| int n = 0, i = 0; |
| struct thread_resume *resume_info, default_action; |
| |
| /* Count the number of semicolons in the packet. There should be one |
| for every action. */ |
| p = &own_buf[5]; |
| while (p) |
| { |
| n++; |
| p++; |
| p = strchr (p, ';'); |
| } |
| /* Allocate room for one extra action, for the default remain-stopped |
| behavior; if no default action is in the list, we'll need the extra |
| slot. */ |
| resume_info = malloc ((n + 1) * sizeof (resume_info[0])); |
| |
| default_action.thread = -1; |
| default_action.leave_stopped = 1; |
| default_action.step = 0; |
| default_action.sig = 0; |
| |
| p = &own_buf[5]; |
| i = 0; |
| while (*p) |
| { |
| p++; |
| |
| resume_info[i].leave_stopped = 0; |
| |
| if (p[0] == 's' || p[0] == 'S') |
| resume_info[i].step = 1; |
| else if (p[0] == 'c' || p[0] == 'C') |
| resume_info[i].step = 0; |
| else |
| goto err; |
| |
| if (p[0] == 'S' || p[0] == 'C') |
| { |
| int sig; |
| sig = strtol (p + 1, &q, 16); |
| if (p == q) |
| goto err; |
| p = q; |
| |
| if (!target_signal_to_host_p (sig)) |
| goto err; |
| resume_info[i].sig = target_signal_to_host (sig); |
| } |
| else |
| { |
| resume_info[i].sig = 0; |
| p = p + 1; |
| } |
| |
| if (p[0] == 0) |
| { |
| resume_info[i].thread = -1; |
| default_action = resume_info[i]; |
| |
| /* Note: we don't increment i here, we'll overwrite this entry |
| the next time through. */ |
| } |
| else if (p[0] == ':') |
| { |
| resume_info[i].thread = strtol (p + 1, &q, 16); |
| if (p == q) |
| goto err; |
| p = q; |
| if (p[0] != ';' && p[0] != 0) |
| goto err; |
| |
| i++; |
| } |
| } |
| |
| resume_info[i] = default_action; |
| |
| /* Still used in occasional places in the backend. */ |
| if (n == 1 && resume_info[0].thread != -1) |
| cont_thread = resume_info[0].thread; |
| else |
| cont_thread = -1; |
| set_desired_inferior (0); |
| |
| (*the_target->resume) (resume_info); |
| |
| free (resume_info); |
| |
| *signal = mywait (status, 1); |
| prepare_resume_reply (own_buf, *status, *signal); |
| return; |
| |
| err: |
| /* No other way to report an error... */ |
| strcpy (own_buf, ""); |
| free (resume_info); |
| return; |
| } |
| |
| /* Handle all of the extended 'v' packets. */ |
| void |
| handle_v_requests (char *own_buf, char *status, unsigned char *signal) |
| { |
| if (strncmp (own_buf, "vCont;", 6) == 0) |
| { |
| handle_v_cont (own_buf, status, signal); |
| return; |
| } |
| |
| if (strncmp (own_buf, "vCont?", 6) == 0) |
| { |
| strcpy (own_buf, "vCont;c;C;s;S"); |
| return; |
| } |
| |
| /* Otherwise we didn't know what packet it was. Say we didn't |
| understand it. */ |
| own_buf[0] = 0; |
| return; |
| } |
| |
| void |
| myresume (int step, int sig) |
| { |
| struct thread_resume resume_info[2]; |
| int n = 0; |
| |
| if (step || sig || cont_thread > 0) |
| { |
| resume_info[0].thread |
| = ((struct inferior_list_entry *) current_inferior)->id; |
| resume_info[0].step = step; |
| resume_info[0].sig = sig; |
| resume_info[0].leave_stopped = 0; |
| n++; |
| } |
| resume_info[n].thread = -1; |
| resume_info[n].step = 0; |
| resume_info[n].sig = 0; |
| resume_info[n].leave_stopped = (cont_thread > 0); |
| |
| (*the_target->resume) (resume_info); |
| } |
| |
| 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 'D': |
| fprintf (stderr, "Detaching from inferior\n"); |
| detach_inferior (); |
| write_ok (own_buf); |
| putpkt (own_buf); |
| remote_close (); |
| |
| /* If we are attached, then we can exit. Otherwise, we need to |
| hang around doing nothing, until the child is gone. */ |
| if (!attached) |
| { |
| int status, ret; |
| |
| do { |
| ret = waitpid (signal_pid, &status, 0); |
| if (WIFEXITED (status) || WIFSIGNALED (status)) |
| break; |
| } while (ret != -1 || errno != ECHILD); |
| } |
| |
| exit (0); |
| |
| 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); |
| if (read_inferior_memory (mem_addr, mem_buf, len) == 0) |
| convert_int_to_ascii (mem_buf, own_buf, len); |
| else |
| write_enn (own_buf); |
| 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; |
| } |
| 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 (); |
| } |
| } |
| } |