1 /* Remote utility routines for the remote server for GDB.
2 Copyright (C) 1986-2016 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 #include "gdbthread.h"
28 #include <sys/ioctl.h>
34 #include <netinet/in.h>
37 #include <sys/socket.h>
42 #if HAVE_NETINET_TCP_H
43 #include <netinet/tcp.h>
46 #include <sys/ioctl.h>
54 #include "gdb_sys_time.h"
57 #include <arpa/inet.h>
66 #include <sys/iomgr.h>
69 #ifndef HAVE_SOCKLEN_T
70 typedef int socklen_t
;
73 #ifndef IN_PROCESS_AGENT
76 # define INVALID_DESCRIPTOR INVALID_SOCKET
78 # define INVALID_DESCRIPTOR -1
81 /* Extra value for readchar_callback. */
83 /* The callback is currently not scheduled. */
87 /* Status of the readchar callback.
88 Either NOT_SCHEDULED or the callback id. */
89 static int readchar_callback
= NOT_SCHEDULED
;
91 static int readchar (void);
92 static void reset_readchar (void);
93 static void reschedule (void);
95 /* A cache entry for a successfully looked-up symbol. */
100 struct sym_cache
*next
;
103 int remote_debug
= 0;
104 struct ui_file
*gdb_stdlog
;
106 static int remote_is_stdio
= 0;
108 static gdb_fildes_t remote_desc
= INVALID_DESCRIPTOR
;
109 static gdb_fildes_t listen_desc
= INVALID_DESCRIPTOR
;
111 /* FIXME headerize? */
112 extern int using_threads
;
113 extern int debug_threads
;
115 /* If true, then GDB has requested noack mode. */
117 /* If true, then we tell GDB to use noack mode by default. */
118 int transport_is_reliable
= 0;
121 # define read(fd, buf, len) recv (fd, (char *) buf, len, 0)
122 # define write(fd, buf, len) send (fd, (char *) buf, len, 0)
128 return remote_desc
!= INVALID_DESCRIPTOR
;
131 /* Return true if the remote connection is over stdio. */
134 remote_connection_is_stdio (void)
136 return remote_is_stdio
;
140 enable_async_notification (int fd
)
142 #if defined(F_SETFL) && defined (FASYNC)
143 int save_fcntl_flags
;
145 save_fcntl_flags
= fcntl (fd
, F_GETFL
, 0);
146 fcntl (fd
, F_SETFL
, save_fcntl_flags
| FASYNC
);
147 #if defined (F_SETOWN)
148 fcntl (fd
, F_SETOWN
, getpid ());
154 handle_accept_event (int err
, gdb_client_data client_data
)
156 struct sockaddr_in sockaddr
;
160 debug_printf ("handling possible accept event\n");
162 tmp
= sizeof (sockaddr
);
163 remote_desc
= accept (listen_desc
, (struct sockaddr
*) &sockaddr
, &tmp
);
164 if (remote_desc
== -1)
165 perror_with_name ("Accept failed");
167 /* Enable TCP keep alive process. */
169 setsockopt (remote_desc
, SOL_SOCKET
, SO_KEEPALIVE
,
170 (char *) &tmp
, sizeof (tmp
));
172 /* Tell TCP not to delay small packets. This greatly speeds up
173 interactive response. */
175 setsockopt (remote_desc
, IPPROTO_TCP
, TCP_NODELAY
,
176 (char *) &tmp
, sizeof (tmp
));
179 signal (SIGPIPE
, SIG_IGN
); /* If we don't do this, then gdbserver simply
180 exits when the remote side dies. */
186 close (listen_desc
); /* No longer need this */
188 closesocket (listen_desc
); /* No longer need this */
192 /* Even if !RUN_ONCE no longer notice new connections. Still keep the
193 descriptor open for add_file_handler to wait for a new connection. */
194 delete_file_handler (listen_desc
);
196 /* Convert IP address to string. */
197 fprintf (stderr
, "Remote debugging from host %s\n",
198 inet_ntoa (sockaddr
.sin_addr
));
200 enable_async_notification (remote_desc
);
202 /* Register the event loop handler. */
203 add_file_handler (remote_desc
, handle_serial_event
, NULL
);
205 /* We have a new GDB connection now. If we were disconnected
206 tracing, there's a window where the target could report a stop
207 event to the event loop, and since we have a connection now, we'd
208 try to send vStopped notifications to GDB. But, don't do that
209 until GDB as selected all-stop/non-stop, and has queried the
210 threads' status ('?'). */
216 /* Prepare for a later connection to a remote debugger.
217 NAME is the filename used for communication. */
220 remote_prepare (char *name
)
224 static int winsock_initialized
;
227 struct sockaddr_in sockaddr
;
232 if (strcmp (name
, STDIO_CONNECTION_NAME
) == 0)
234 /* We need to record fact that we're using stdio sooner than the
235 call to remote_open so start_inferior knows the connection is
238 transport_is_reliable
= 1;
242 port_str
= strchr (name
, ':');
243 if (port_str
== NULL
)
245 transport_is_reliable
= 0;
249 port
= strtoul (port_str
+ 1, &port_end
, 10);
250 if (port_str
[1] == '\0' || *port_end
!= '\0')
251 error ("Bad port argument: %s", name
);
254 if (!winsock_initialized
)
258 WSAStartup (MAKEWORD (1, 0), &wsad
);
259 winsock_initialized
= 1;
263 listen_desc
= socket (PF_INET
, SOCK_STREAM
, IPPROTO_TCP
);
264 if (listen_desc
== -1)
265 perror_with_name ("Can't open socket");
267 /* Allow rapid reuse of this port. */
269 setsockopt (listen_desc
, SOL_SOCKET
, SO_REUSEADDR
, (char *) &tmp
,
272 sockaddr
.sin_family
= PF_INET
;
273 sockaddr
.sin_port
= htons (port
);
274 sockaddr
.sin_addr
.s_addr
= INADDR_ANY
;
276 if (bind (listen_desc
, (struct sockaddr
*) &sockaddr
, sizeof (sockaddr
))
277 || listen (listen_desc
, 1))
278 perror_with_name ("Can't bind address");
280 transport_is_reliable
= 1;
283 /* Open a connection to a remote debugger.
284 NAME is the filename used for communication. */
287 remote_open (char *name
)
291 port_str
= strchr (name
, ':');
293 if (port_str
== NULL
)
294 error ("Only <host>:<port> is supported on this platform.");
297 if (strcmp (name
, STDIO_CONNECTION_NAME
) == 0)
299 fprintf (stderr
, "Remote debugging using stdio\n");
301 /* Use stdin as the handle of the connection.
302 We only select on reads, for example. */
303 remote_desc
= fileno (stdin
);
305 enable_async_notification (remote_desc
);
307 /* Register the event loop handler. */
308 add_file_handler (remote_desc
, handle_serial_event
, NULL
);
311 else if (port_str
== NULL
)
315 if (stat (name
, &statbuf
) == 0
316 && (S_ISCHR (statbuf
.st_mode
) || S_ISFIFO (statbuf
.st_mode
)))
317 remote_desc
= open (name
, O_RDWR
);
325 perror_with_name ("Could not open remote device");
329 struct termios termios
;
330 tcgetattr (remote_desc
, &termios
);
335 termios
.c_cflag
&= ~(CSIZE
| PARENB
);
336 termios
.c_cflag
|= CLOCAL
| CS8
;
337 termios
.c_cc
[VMIN
] = 1;
338 termios
.c_cc
[VTIME
] = 0;
340 tcsetattr (remote_desc
, TCSANOW
, &termios
);
346 struct termio termio
;
347 ioctl (remote_desc
, TCGETA
, &termio
);
352 termio
.c_cflag
&= ~(CSIZE
| PARENB
);
353 termio
.c_cflag
|= CLOCAL
| CS8
;
354 termio
.c_cc
[VMIN
] = 1;
355 termio
.c_cc
[VTIME
] = 0;
357 ioctl (remote_desc
, TCSETA
, &termio
);
365 ioctl (remote_desc
, TIOCGETP
, &sg
);
367 ioctl (remote_desc
, TIOCSETP
, &sg
);
371 fprintf (stderr
, "Remote debugging using %s\n", name
);
373 enable_async_notification (remote_desc
);
375 /* Register the event loop handler. */
376 add_file_handler (remote_desc
, handle_serial_event
, NULL
);
378 #endif /* USE_WIN32API */
383 struct sockaddr_in sockaddr
;
385 len
= sizeof (sockaddr
);
386 if (getsockname (listen_desc
,
387 (struct sockaddr
*) &sockaddr
, &len
) < 0
388 || len
< sizeof (sockaddr
))
389 perror_with_name ("Can't determine port");
390 port
= ntohs (sockaddr
.sin_port
);
392 fprintf (stderr
, "Listening on port %d\n", port
);
395 /* Register the event loop handler. */
396 add_file_handler (listen_desc
, handle_accept_event
, NULL
);
403 delete_file_handler (remote_desc
);
406 closesocket (remote_desc
);
408 if (! remote_connection_is_stdio ())
411 remote_desc
= INVALID_DESCRIPTOR
;
418 #ifndef IN_PROCESS_AGENT
421 decode_address (CORE_ADDR
*addrp
, const char *start
, int len
)
428 for (i
= 0; i
< len
; i
++)
432 addr
= addr
| (fromhex (ch
) & 0x0f);
438 decode_address_to_semicolon (CORE_ADDR
*addrp
, const char *start
)
443 while (*end
!= '\0' && *end
!= ';')
446 decode_address (addrp
, start
, end
- start
);
455 #ifndef IN_PROCESS_AGENT
457 /* Look for a sequence of characters which can be run-length encoded.
458 If there are any, update *CSUM and *P. Otherwise, output the
459 single character. Return the number of characters consumed. */
462 try_rle (char *buf
, int remaining
, unsigned char *csum
, char **p
)
466 /* Always output the character. */
470 /* Don't go past '~'. */
474 for (n
= 1; n
< remaining
; n
++)
475 if (buf
[n
] != buf
[0])
478 /* N is the index of the first character not the same as buf[0].
479 buf[0] is counted twice, so by decrementing N, we get the number
480 of characters the RLE sequence will replace. */
486 /* Skip the frame characters. The manual says to skip '+' and '-'
487 also, but there's no reason to. Unfortunately these two unusable
488 characters double the encoded length of a four byte zero
490 while (n
+ 29 == '$' || n
+ 29 == '#')
503 #ifndef IN_PROCESS_AGENT
505 /* Write a PTID to BUF. Returns BUF+CHARACTERS_WRITTEN. */
508 write_ptid (char *buf
, ptid_t ptid
)
514 pid
= ptid_get_pid (ptid
);
516 buf
+= sprintf (buf
, "p-%x.", -pid
);
518 buf
+= sprintf (buf
, "p%x.", pid
);
520 tid
= ptid_get_lwp (ptid
);
522 buf
+= sprintf (buf
, "-%x", -tid
);
524 buf
+= sprintf (buf
, "%x", tid
);
530 hex_or_minus_one (char *buf
, char **obuf
)
534 if (startswith (buf
, "-1"))
540 buf
= unpack_varlen_hex (buf
, &ret
);
548 /* Extract a PTID from BUF. If non-null, OBUF is set to the to one
549 passed the last parsed char. Returns null_ptid on error. */
551 read_ptid (char *buf
, char **obuf
)
555 ULONGEST pid
= 0, tid
= 0;
559 /* Multi-process ptid. */
560 pp
= unpack_varlen_hex (p
+ 1, &pid
);
562 error ("invalid remote ptid: %s\n", p
);
566 tid
= hex_or_minus_one (p
, &pp
);
570 return ptid_build (pid
, tid
, 0);
573 /* No multi-process. Just a tid. */
574 tid
= hex_or_minus_one (p
, &pp
);
576 /* Since GDB is not sending a process id (multi-process extensions
577 are off), then there's only one process. Default to the first in
579 pid
= pid_of (get_first_process ());
583 return ptid_build (pid
, tid
, 0);
586 /* Write COUNT bytes in BUF to the client.
587 The result is the number of bytes written or -1 if error.
588 This may return less than COUNT. */
591 write_prim (const void *buf
, int count
)
593 if (remote_connection_is_stdio ())
594 return write (fileno (stdout
), buf
, count
);
596 return write (remote_desc
, buf
, count
);
599 /* Read COUNT bytes from the client and store in BUF.
600 The result is the number of bytes read or -1 if error.
601 This may return less than COUNT. */
604 read_prim (void *buf
, int count
)
606 if (remote_connection_is_stdio ())
607 return read (fileno (stdin
), buf
, count
);
609 return read (remote_desc
, buf
, count
);
612 /* Send a packet to the remote machine, with error checking.
613 The data of the packet is in BUF, and the length of the
614 packet is in CNT. Returns >= 0 on success, -1 otherwise. */
617 putpkt_binary_1 (char *buf
, int cnt
, int is_notif
)
620 unsigned char csum
= 0;
625 buf2
= (char *) xmalloc (strlen ("$") + cnt
+ strlen ("#nn") + 1);
627 /* Copy the packet into buffer BUF2, encapsulating it
628 and giving it a checksum. */
636 for (i
= 0; i
< cnt
;)
637 i
+= try_rle (buf
+ i
, cnt
- i
, &csum
, &p
);
640 *p
++ = tohex ((csum
>> 4) & 0xf);
641 *p
++ = tohex (csum
& 0xf);
645 /* Send it over and over until we get a positive ack. */
649 if (write_prim (buf2
, p
- buf2
) != p
- buf2
)
651 perror ("putpkt(write)");
656 if (noack_mode
|| is_notif
)
658 /* Don't expect an ack then. */
662 fprintf (stderr
, "putpkt (\"%s\"); [notif]\n", buf2
);
664 fprintf (stderr
, "putpkt (\"%s\"); [noack mode]\n", buf2
);
672 fprintf (stderr
, "putpkt (\"%s\"); [looking for ack]\n", buf2
);
686 fprintf (stderr
, "[received '%c' (0x%x)]\n", cc
, cc
);
690 /* Check for an input interrupt while we're here. */
691 if (cc
== '\003' && current_thread
!= NULL
)
692 (*the_target
->request_interrupt
) ();
697 return 1; /* Success! */
701 putpkt_binary (char *buf
, int cnt
)
703 return putpkt_binary_1 (buf
, cnt
, 0);
706 /* Send a packet to the remote machine, with error checking. The data
707 of the packet is in BUF, and the packet should be a NUL-terminated
708 string. Returns >= 0 on success, -1 otherwise. */
713 return putpkt_binary (buf
, strlen (buf
));
717 putpkt_notif (char *buf
)
719 return putpkt_binary_1 (buf
, strlen (buf
), 1);
722 /* Come here when we get an input interrupt from the remote side. This
723 interrupt should only be active while we are waiting for the child to do
724 something. Thus this assumes readchar:bufcnt is 0.
725 About the only thing that should come through is a ^C, which
726 will cause us to request child interruption. */
729 input_interrupt (int unused
)
732 struct timeval immediate
= { 0, 0 };
734 /* Protect against spurious interrupts. This has been observed to
735 be a problem under NetBSD 1.4 and 1.5. */
738 FD_SET (remote_desc
, &readset
);
739 if (select (remote_desc
+ 1, &readset
, 0, 0, &immediate
) > 0)
744 cc
= read_prim (&c
, 1);
748 fprintf (stderr
, "client connection closed\n");
751 else if (cc
!= 1 || c
!= '\003')
753 fprintf (stderr
, "input_interrupt, count = %d c = %d ", cc
, c
);
755 fprintf (stderr
, "('%c')\n", c
);
757 fprintf (stderr
, "('\\x%02x')\n", c
& 0xff);
761 (*the_target
->request_interrupt
) ();
765 /* Check if the remote side sent us an interrupt request (^C). */
767 check_remote_input_interrupt_request (void)
769 /* This function may be called before establishing communications,
770 therefore we need to validate the remote descriptor. */
772 if (remote_desc
== INVALID_DESCRIPTOR
)
778 /* Asynchronous I/O support. SIGIO must be enabled when waiting, in order to
779 accept Control-C from the client, and must be disabled when talking to
783 unblock_async_io (void)
788 sigemptyset (&sigio_set
);
789 sigaddset (&sigio_set
, SIGIO
);
790 sigprocmask (SIG_UNBLOCK
, &sigio_set
, NULL
);
796 nto_comctrl (int enable
)
798 struct sigevent event
;
802 event
.sigev_notify
= SIGEV_SIGNAL_THREAD
;
803 event
.sigev_signo
= SIGIO
;
804 event
.sigev_code
= 0;
805 event
.sigev_value
.sival_ptr
= NULL
;
806 event
.sigev_priority
= -1;
807 ionotify (remote_desc
, _NOTIFY_ACTION_POLLARM
, _NOTIFY_COND_INPUT
,
811 ionotify (remote_desc
, _NOTIFY_ACTION_POLL
, _NOTIFY_COND_INPUT
, NULL
);
816 /* Current state of asynchronous I/O. */
817 static int async_io_enabled
;
819 /* Enable asynchronous I/O. */
821 enable_async_io (void)
823 if (async_io_enabled
)
827 signal (SIGIO
, input_interrupt
);
829 async_io_enabled
= 1;
835 /* Disable asynchronous I/O. */
837 disable_async_io (void)
839 if (!async_io_enabled
)
843 signal (SIGIO
, SIG_IGN
);
845 async_io_enabled
= 0;
853 initialize_async_io (void)
855 /* Make sure that async I/O starts disabled. */
856 async_io_enabled
= 1;
859 /* Make sure the signal is unblocked. */
863 /* Internal buffer used by readchar.
864 These are global to readchar because reschedule_remote needs to be
865 able to tell whether the buffer is empty. */
867 static unsigned char readchar_buf
[BUFSIZ
];
868 static int readchar_bufcnt
= 0;
869 static unsigned char *readchar_bufp
;
871 /* Returns next char from remote GDB. -1 if error. */
878 if (readchar_bufcnt
== 0)
880 readchar_bufcnt
= read_prim (readchar_buf
, sizeof (readchar_buf
));
882 if (readchar_bufcnt
<= 0)
884 if (readchar_bufcnt
== 0)
887 fprintf (stderr
, "readchar: Got EOF\n");
895 readchar_bufp
= readchar_buf
;
899 ch
= *readchar_bufp
++;
904 /* Reset the readchar state machine. */
907 reset_readchar (void)
910 if (readchar_callback
!= NOT_SCHEDULED
)
912 delete_callback_event (readchar_callback
);
913 readchar_callback
= NOT_SCHEDULED
;
917 /* Process remaining data in readchar_buf. */
920 process_remaining (void *context
)
924 /* This is a one-shot event. */
925 readchar_callback
= NOT_SCHEDULED
;
927 if (readchar_bufcnt
> 0)
928 res
= handle_serial_event (0, NULL
);
935 /* If there is still data in the buffer, queue another event to process it,
936 we can't sleep in select yet. */
941 if (readchar_bufcnt
> 0 && readchar_callback
== NOT_SCHEDULED
)
942 readchar_callback
= append_callback_event (process_remaining
, NULL
);
945 /* Read a packet from the remote machine, with error checking,
946 and store it in BUF. Returns length of packet, or negative if error. */
952 unsigned char csum
, c1
, c2
;
963 /* The '\003' may appear before or after each packet, so
964 check for an input interrupt. */
967 (*the_target
->request_interrupt
) ();
975 fprintf (stderr
, "[getpkt: discarding char '%c']\n", c
);
996 c1
= fromhex (readchar ());
997 c2
= fromhex (readchar ());
999 if (csum
== (c1
<< 4) + c2
)
1005 "Bad checksum, sentsum=0x%x, csum=0x%x, "
1006 "buf=%s [no-ack-mode, Bad medium?]\n",
1007 (c1
<< 4) + c2
, csum
, buf
);
1008 /* Not much we can do, GDB wasn't expecting an ack/nac. */
1012 fprintf (stderr
, "Bad checksum, sentsum=0x%x, csum=0x%x, buf=%s\n",
1013 (c1
<< 4) + c2
, csum
, buf
);
1014 if (write_prim ("-", 1) != 1)
1022 fprintf (stderr
, "getpkt (\"%s\"); [sending ack] \n", buf
);
1026 if (write_prim ("+", 1) != 1)
1031 fprintf (stderr
, "[sent ack]\n");
1039 fprintf (stderr
, "getpkt (\"%s\"); [no ack sent] \n", buf
);
1048 write_ok (char *buf
)
1056 write_enn (char *buf
)
1058 /* Some day, we should define the meanings of the error codes... */
1067 #ifndef IN_PROCESS_AGENT
1070 outreg (struct regcache
*regcache
, int regno
, char *buf
)
1072 if ((regno
>> 12) != 0)
1073 *buf
++ = tohex ((regno
>> 12) & 0xf);
1074 if ((regno
>> 8) != 0)
1075 *buf
++ = tohex ((regno
>> 8) & 0xf);
1076 *buf
++ = tohex ((regno
>> 4) & 0xf);
1077 *buf
++ = tohex (regno
& 0xf);
1079 collect_register_as_string (regcache
, regno
, buf
);
1080 buf
+= 2 * register_size (regcache
->tdesc
, regno
);
1087 new_thread_notify (int id
)
1091 /* The `n' response is not yet part of the remote protocol. Do nothing. */
1095 if (server_waiting
== 0)
1098 sprintf (own_buf
, "n%x", id
);
1099 disable_async_io ();
1105 dead_thread_notify (int id
)
1109 /* The `x' response is not yet part of the remote protocol. Do nothing. */
1113 sprintf (own_buf
, "x%x", id
);
1114 disable_async_io ();
1120 prepare_resume_reply (char *buf
, ptid_t ptid
,
1121 struct target_waitstatus
*status
)
1124 debug_printf ("Writing resume reply for %s:%d\n",
1125 target_pid_to_str (ptid
), status
->kind
);
1127 switch (status
->kind
)
1129 case TARGET_WAITKIND_STOPPED
:
1130 case TARGET_WAITKIND_FORKED
:
1131 case TARGET_WAITKIND_VFORKED
:
1132 case TARGET_WAITKIND_VFORK_DONE
:
1133 case TARGET_WAITKIND_EXECD
:
1134 case TARGET_WAITKIND_THREAD_CREATED
:
1135 case TARGET_WAITKIND_SYSCALL_ENTRY
:
1136 case TARGET_WAITKIND_SYSCALL_RETURN
:
1138 struct thread_info
*saved_thread
;
1140 struct regcache
*regcache
;
1142 if ((status
->kind
== TARGET_WAITKIND_FORKED
&& report_fork_events
)
1143 || (status
->kind
== TARGET_WAITKIND_VFORKED
&& report_vfork_events
))
1145 enum gdb_signal signal
= GDB_SIGNAL_TRAP
;
1146 const char *event
= (status
->kind
== TARGET_WAITKIND_FORKED
1147 ? "fork" : "vfork");
1149 sprintf (buf
, "T%02x%s:", signal
, event
);
1150 buf
+= strlen (buf
);
1151 buf
= write_ptid (buf
, status
->value
.related_pid
);
1154 else if (status
->kind
== TARGET_WAITKIND_VFORK_DONE
&& report_vfork_events
)
1156 enum gdb_signal signal
= GDB_SIGNAL_TRAP
;
1158 sprintf (buf
, "T%02xvforkdone:;", signal
);
1160 else if (status
->kind
== TARGET_WAITKIND_EXECD
&& report_exec_events
)
1162 enum gdb_signal signal
= GDB_SIGNAL_TRAP
;
1163 const char *event
= "exec";
1164 char hexified_pathname
[PATH_MAX
* 2];
1166 sprintf (buf
, "T%02x%s:", signal
, event
);
1167 buf
+= strlen (buf
);
1169 /* Encode pathname to hexified format. */
1170 bin2hex ((const gdb_byte
*) status
->value
.execd_pathname
,
1172 strlen (status
->value
.execd_pathname
));
1174 sprintf (buf
, "%s;", hexified_pathname
);
1175 xfree (status
->value
.execd_pathname
);
1176 status
->value
.execd_pathname
= NULL
;
1177 buf
+= strlen (buf
);
1179 else if (status
->kind
== TARGET_WAITKIND_THREAD_CREATED
1180 && report_thread_events
)
1182 enum gdb_signal signal
= GDB_SIGNAL_TRAP
;
1184 sprintf (buf
, "T%02xcreate:;", signal
);
1186 else if (status
->kind
== TARGET_WAITKIND_SYSCALL_ENTRY
1187 || status
->kind
== TARGET_WAITKIND_SYSCALL_RETURN
)
1189 enum gdb_signal signal
= GDB_SIGNAL_TRAP
;
1190 const char *event
= (status
->kind
== TARGET_WAITKIND_SYSCALL_ENTRY
1191 ? "syscall_entry" : "syscall_return");
1193 sprintf (buf
, "T%02x%s:%x;", signal
, event
,
1194 status
->value
.syscall_number
);
1197 sprintf (buf
, "T%02x", status
->value
.sig
);
1199 buf
+= strlen (buf
);
1201 saved_thread
= current_thread
;
1203 current_thread
= find_thread_ptid (ptid
);
1205 regp
= current_target_desc ()->expedite_regs
;
1207 regcache
= get_thread_regcache (current_thread
, 1);
1209 if (the_target
->stopped_by_watchpoint
!= NULL
1210 && (*the_target
->stopped_by_watchpoint
) ())
1215 strncpy (buf
, "watch:", 6);
1218 addr
= (*the_target
->stopped_data_address
) ();
1220 /* Convert each byte of the address into two hexadecimal
1221 chars. Note that we take sizeof (void *) instead of
1222 sizeof (addr); this is to avoid sending a 64-bit
1223 address to a 32-bit GDB. */
1224 for (i
= sizeof (void *) * 2; i
> 0; i
--)
1225 *buf
++ = tohex ((addr
>> (i
- 1) * 4) & 0xf);
1228 else if (swbreak_feature
&& target_stopped_by_sw_breakpoint ())
1230 sprintf (buf
, "swbreak:;");
1231 buf
+= strlen (buf
);
1233 else if (hwbreak_feature
&& target_stopped_by_hw_breakpoint ())
1235 sprintf (buf
, "hwbreak:;");
1236 buf
+= strlen (buf
);
1241 buf
= outreg (regcache
, find_regno (regcache
->tdesc
, *regp
), buf
);
1246 /* Formerly, if the debugger had not used any thread features
1247 we would not burden it with a thread status response. This
1248 was for the benefit of GDB 4.13 and older. However, in
1249 recent GDB versions the check (``if (cont_thread != 0)'')
1250 does not have the desired effect because of sillyness in
1251 the way that the remote protocol handles specifying a
1252 thread. Since thread support relies on qSymbol support
1253 anyway, assume GDB can handle threads. */
1255 if (using_threads
&& !disable_packet_Tthread
)
1257 /* This if (1) ought to be unnecessary. But remote_wait
1258 in GDB will claim this event belongs to inferior_ptid
1259 if we do not specify a thread, and there's no way for
1260 gdbserver to know what inferior_ptid is. */
1261 if (1 || !ptid_equal (general_thread
, ptid
))
1264 /* In non-stop, don't change the general thread behind
1267 general_thread
= ptid
;
1268 sprintf (buf
, "thread:");
1269 buf
+= strlen (buf
);
1270 buf
= write_ptid (buf
, ptid
);
1272 buf
+= strlen (buf
);
1274 core
= target_core_of_thread (ptid
);
1278 sprintf (buf
, "core:");
1279 buf
+= strlen (buf
);
1280 sprintf (buf
, "%x", core
);
1282 buf
+= strlen (buf
);
1289 strcpy (buf
, "library:;");
1290 buf
+= strlen (buf
);
1294 current_thread
= saved_thread
;
1297 case TARGET_WAITKIND_EXITED
:
1299 sprintf (buf
, "W%x;process:%x",
1300 status
->value
.integer
, ptid_get_pid (ptid
));
1302 sprintf (buf
, "W%02x", status
->value
.integer
);
1304 case TARGET_WAITKIND_SIGNALLED
:
1306 sprintf (buf
, "X%x;process:%x",
1307 status
->value
.sig
, ptid_get_pid (ptid
));
1309 sprintf (buf
, "X%02x", status
->value
.sig
);
1311 case TARGET_WAITKIND_THREAD_EXITED
:
1312 sprintf (buf
, "w%x;", status
->value
.integer
);
1313 buf
+= strlen (buf
);
1314 buf
= write_ptid (buf
, ptid
);
1316 case TARGET_WAITKIND_NO_RESUMED
:
1320 error ("unhandled waitkind");
1326 decode_m_packet (char *from
, CORE_ADDR
*mem_addr_ptr
, unsigned int *len_ptr
)
1330 *mem_addr_ptr
= *len_ptr
= 0;
1332 while ((ch
= from
[i
++]) != ',')
1334 *mem_addr_ptr
= *mem_addr_ptr
<< 4;
1335 *mem_addr_ptr
|= fromhex (ch
) & 0x0f;
1338 for (j
= 0; j
< 4; j
++)
1340 if ((ch
= from
[i
++]) == 0)
1342 *len_ptr
= *len_ptr
<< 4;
1343 *len_ptr
|= fromhex (ch
) & 0x0f;
1348 decode_M_packet (char *from
, CORE_ADDR
*mem_addr_ptr
, unsigned int *len_ptr
,
1349 unsigned char **to_p
)
1353 *mem_addr_ptr
= *len_ptr
= 0;
1355 while ((ch
= from
[i
++]) != ',')
1357 *mem_addr_ptr
= *mem_addr_ptr
<< 4;
1358 *mem_addr_ptr
|= fromhex (ch
) & 0x0f;
1361 while ((ch
= from
[i
++]) != ':')
1363 *len_ptr
= *len_ptr
<< 4;
1364 *len_ptr
|= fromhex (ch
) & 0x0f;
1368 *to_p
= (unsigned char *) xmalloc (*len_ptr
);
1370 hex2bin (&from
[i
++], *to_p
, *len_ptr
);
1374 decode_X_packet (char *from
, int packet_len
, CORE_ADDR
*mem_addr_ptr
,
1375 unsigned int *len_ptr
, unsigned char **to_p
)
1379 *mem_addr_ptr
= *len_ptr
= 0;
1381 while ((ch
= from
[i
++]) != ',')
1383 *mem_addr_ptr
= *mem_addr_ptr
<< 4;
1384 *mem_addr_ptr
|= fromhex (ch
) & 0x0f;
1387 while ((ch
= from
[i
++]) != ':')
1389 *len_ptr
= *len_ptr
<< 4;
1390 *len_ptr
|= fromhex (ch
) & 0x0f;
1394 *to_p
= (unsigned char *) xmalloc (*len_ptr
);
1396 if (remote_unescape_input ((const gdb_byte
*) &from
[i
], packet_len
- i
,
1397 *to_p
, *len_ptr
) != *len_ptr
)
1403 /* Decode a qXfer write request. */
1406 decode_xfer_write (char *buf
, int packet_len
, CORE_ADDR
*offset
,
1407 unsigned int *len
, unsigned char *data
)
1412 /* Extract the offset. */
1414 while ((ch
= *buf
++) != ':')
1416 *offset
= *offset
<< 4;
1417 *offset
|= fromhex (ch
) & 0x0f;
1420 /* Get encoded data. */
1421 packet_len
-= buf
- b
;
1422 *len
= remote_unescape_input ((const gdb_byte
*) buf
, packet_len
,
1427 /* Decode the parameters of a qSearch:memory packet. */
1430 decode_search_memory_packet (const char *buf
, int packet_len
,
1431 CORE_ADDR
*start_addrp
,
1432 CORE_ADDR
*search_space_lenp
,
1433 gdb_byte
*pattern
, unsigned int *pattern_lenp
)
1435 const char *p
= buf
;
1437 p
= decode_address_to_semicolon (start_addrp
, p
);
1438 p
= decode_address_to_semicolon (search_space_lenp
, p
);
1439 packet_len
-= p
- buf
;
1440 *pattern_lenp
= remote_unescape_input ((const gdb_byte
*) p
, packet_len
,
1441 pattern
, packet_len
);
1446 free_sym_cache (struct sym_cache
*sym
)
1456 clear_symbol_cache (struct sym_cache
**symcache_p
)
1458 struct sym_cache
*sym
, *next
;
1460 /* Check the cache first. */
1461 for (sym
= *symcache_p
; sym
; sym
= next
)
1464 free_sym_cache (sym
);
1470 /* Get the address of NAME, and return it in ADDRP if found. if
1471 MAY_ASK_GDB is false, assume symbol cache misses are failures.
1472 Returns 1 if the symbol is found, 0 if it is not, -1 on error. */
1475 look_up_one_symbol (const char *name
, CORE_ADDR
*addrp
, int may_ask_gdb
)
1477 char own_buf
[266], *p
, *q
;
1479 struct sym_cache
*sym
;
1480 struct process_info
*proc
;
1482 proc
= current_process ();
1484 /* Check the cache first. */
1485 for (sym
= proc
->symbol_cache
; sym
; sym
= sym
->next
)
1486 if (strcmp (name
, sym
->name
) == 0)
1492 /* It might not be an appropriate time to look up a symbol,
1493 e.g. while we're trying to fetch registers. */
1497 /* Send the request. */
1498 strcpy (own_buf
, "qSymbol:");
1499 bin2hex ((const gdb_byte
*) name
, own_buf
+ strlen ("qSymbol:"),
1501 if (putpkt (own_buf
) < 0)
1504 /* FIXME: Eventually add buffer overflow checking (to getpkt?) */
1505 len
= getpkt (own_buf
);
1509 /* We ought to handle pretty much any packet at this point while we
1510 wait for the qSymbol "response". That requires re-entering the
1511 main loop. For now, this is an adequate approximation; allow
1512 GDB to read from memory while it figures out the address of the
1514 while (own_buf
[0] == 'm')
1517 unsigned char *mem_buf
;
1518 unsigned int mem_len
;
1520 decode_m_packet (&own_buf
[1], &mem_addr
, &mem_len
);
1521 mem_buf
= (unsigned char *) xmalloc (mem_len
);
1522 if (read_inferior_memory (mem_addr
, mem_buf
, mem_len
) == 0)
1523 bin2hex (mem_buf
, own_buf
, mem_len
);
1525 write_enn (own_buf
);
1527 if (putpkt (own_buf
) < 0)
1529 len
= getpkt (own_buf
);
1534 if (!startswith (own_buf
, "qSymbol:"))
1536 warning ("Malformed response to qSymbol, ignoring: %s\n", own_buf
);
1540 p
= own_buf
+ strlen ("qSymbol:");
1542 while (*q
&& *q
!= ':')
1545 /* Make sure we found a value for the symbol. */
1546 if (p
== q
|| *q
== '\0')
1549 decode_address (addrp
, p
, q
- p
);
1551 /* Save the symbol in our cache. */
1552 sym
= XNEW (struct sym_cache
);
1553 sym
->name
= xstrdup (name
);
1555 sym
->next
= proc
->symbol_cache
;
1556 proc
->symbol_cache
= sym
;
1561 /* Relocate an instruction to execute at a different address. OLDLOC
1562 is the address in the inferior memory where the instruction to
1563 relocate is currently at. On input, TO points to the destination
1564 where we want the instruction to be copied (and possibly adjusted)
1565 to. On output, it points to one past the end of the resulting
1566 instruction(s). The effect of executing the instruction at TO
1567 shall be the same as if executing it at OLDLOC. For example, call
1568 instructions that implicitly push the return address on the stack
1569 should be adjusted to return to the instruction after OLDLOC;
1570 relative branches, and other PC-relative instructions need the
1571 offset adjusted; etc. Returns 0 on success, -1 on failure. */
1574 relocate_instruction (CORE_ADDR
*to
, CORE_ADDR oldloc
)
1578 ULONGEST written
= 0;
1580 /* Send the request. */
1581 strcpy (own_buf
, "qRelocInsn:");
1582 sprintf (own_buf
, "qRelocInsn:%s;%s", paddress (oldloc
),
1584 if (putpkt (own_buf
) < 0)
1587 /* FIXME: Eventually add buffer overflow checking (to getpkt?) */
1588 len
= getpkt (own_buf
);
1592 /* We ought to handle pretty much any packet at this point while we
1593 wait for the qRelocInsn "response". That requires re-entering
1594 the main loop. For now, this is an adequate approximation; allow
1595 GDB to access memory. */
1596 while (own_buf
[0] == 'm' || own_buf
[0] == 'M' || own_buf
[0] == 'X')
1599 unsigned char *mem_buf
= NULL
;
1600 unsigned int mem_len
;
1602 if (own_buf
[0] == 'm')
1604 decode_m_packet (&own_buf
[1], &mem_addr
, &mem_len
);
1605 mem_buf
= (unsigned char *) xmalloc (mem_len
);
1606 if (read_inferior_memory (mem_addr
, mem_buf
, mem_len
) == 0)
1607 bin2hex (mem_buf
, own_buf
, mem_len
);
1609 write_enn (own_buf
);
1611 else if (own_buf
[0] == 'X')
1613 if (decode_X_packet (&own_buf
[1], len
- 1, &mem_addr
,
1614 &mem_len
, &mem_buf
) < 0
1615 || write_inferior_memory (mem_addr
, mem_buf
, mem_len
) != 0)
1616 write_enn (own_buf
);
1622 decode_M_packet (&own_buf
[1], &mem_addr
, &mem_len
, &mem_buf
);
1623 if (write_inferior_memory (mem_addr
, mem_buf
, mem_len
) == 0)
1626 write_enn (own_buf
);
1629 if (putpkt (own_buf
) < 0)
1631 len
= getpkt (own_buf
);
1636 if (own_buf
[0] == 'E')
1638 warning ("An error occurred while relocating an instruction: %s\n",
1643 if (!startswith (own_buf
, "qRelocInsn:"))
1645 warning ("Malformed response to qRelocInsn, ignoring: %s\n",
1650 unpack_varlen_hex (own_buf
+ strlen ("qRelocInsn:"), &written
);
1657 monitor_output (const char *msg
)
1659 int len
= strlen (msg
);
1660 char *buf
= (char *) xmalloc (len
* 2 + 2);
1663 bin2hex ((const gdb_byte
*) msg
, buf
+ 1, len
);