1 /* Remote utility routines for the remote server for GDB.
2 Copyright (C) 1986-2015 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>
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 the stub is not sending a process id, then default to
577 what's in the current inferior. */
578 pid
= ptid_get_pid (current_ptid
);
582 return ptid_build (pid
, tid
, 0);
585 /* Write COUNT bytes in BUF to the client.
586 The result is the number of bytes written or -1 if error.
587 This may return less than COUNT. */
590 write_prim (const void *buf
, int count
)
592 if (remote_connection_is_stdio ())
593 return write (fileno (stdout
), buf
, count
);
595 return write (remote_desc
, buf
, count
);
598 /* Read COUNT bytes from the client and store in BUF.
599 The result is the number of bytes read or -1 if error.
600 This may return less than COUNT. */
603 read_prim (void *buf
, int count
)
605 if (remote_connection_is_stdio ())
606 return read (fileno (stdin
), buf
, count
);
608 return read (remote_desc
, buf
, count
);
611 /* Send a packet to the remote machine, with error checking.
612 The data of the packet is in BUF, and the length of the
613 packet is in CNT. Returns >= 0 on success, -1 otherwise. */
616 putpkt_binary_1 (char *buf
, int cnt
, int is_notif
)
619 unsigned char csum
= 0;
624 buf2
= xmalloc (strlen ("$") + cnt
+ strlen ("#nn") + 1);
626 /* Copy the packet into buffer BUF2, encapsulating it
627 and giving it a checksum. */
635 for (i
= 0; i
< cnt
;)
636 i
+= try_rle (buf
+ i
, cnt
- i
, &csum
, &p
);
639 *p
++ = tohex ((csum
>> 4) & 0xf);
640 *p
++ = tohex (csum
& 0xf);
644 /* Send it over and over until we get a positive ack. */
648 if (write_prim (buf2
, p
- buf2
) != p
- buf2
)
650 perror ("putpkt(write)");
655 if (noack_mode
|| is_notif
)
657 /* Don't expect an ack then. */
661 fprintf (stderr
, "putpkt (\"%s\"); [notif]\n", buf2
);
663 fprintf (stderr
, "putpkt (\"%s\"); [noack mode]\n", buf2
);
671 fprintf (stderr
, "putpkt (\"%s\"); [looking for ack]\n", buf2
);
685 fprintf (stderr
, "[received '%c' (0x%x)]\n", cc
, cc
);
689 /* Check for an input interrupt while we're here. */
690 if (cc
== '\003' && current_thread
!= NULL
)
691 (*the_target
->request_interrupt
) ();
696 return 1; /* Success! */
700 putpkt_binary (char *buf
, int cnt
)
702 return putpkt_binary_1 (buf
, cnt
, 0);
705 /* Send a packet to the remote machine, with error checking. The data
706 of the packet is in BUF, and the packet should be a NUL-terminated
707 string. Returns >= 0 on success, -1 otherwise. */
712 return putpkt_binary (buf
, strlen (buf
));
716 putpkt_notif (char *buf
)
718 return putpkt_binary_1 (buf
, strlen (buf
), 1);
721 /* Come here when we get an input interrupt from the remote side. This
722 interrupt should only be active while we are waiting for the child to do
723 something. Thus this assumes readchar:bufcnt is 0.
724 About the only thing that should come through is a ^C, which
725 will cause us to request child interruption. */
728 input_interrupt (int unused
)
731 struct timeval immediate
= { 0, 0 };
733 /* Protect against spurious interrupts. This has been observed to
734 be a problem under NetBSD 1.4 and 1.5. */
737 FD_SET (remote_desc
, &readset
);
738 if (select (remote_desc
+ 1, &readset
, 0, 0, &immediate
) > 0)
743 cc
= read_prim (&c
, 1);
747 fprintf (stderr
, "client connection closed\n");
750 else if (cc
!= 1 || c
!= '\003' || current_thread
== NULL
)
752 fprintf (stderr
, "input_interrupt, count = %d c = %d ", cc
, c
);
754 fprintf (stderr
, "('%c')\n", c
);
756 fprintf (stderr
, "('\\x%02x')\n", c
& 0xff);
760 (*the_target
->request_interrupt
) ();
764 /* Check if the remote side sent us an interrupt request (^C). */
766 check_remote_input_interrupt_request (void)
768 /* This function may be called before establishing communications,
769 therefore we need to validate the remote descriptor. */
771 if (remote_desc
== INVALID_DESCRIPTOR
)
777 /* Asynchronous I/O support. SIGIO must be enabled when waiting, in order to
778 accept Control-C from the client, and must be disabled when talking to
782 unblock_async_io (void)
787 sigemptyset (&sigio_set
);
788 sigaddset (&sigio_set
, SIGIO
);
789 sigprocmask (SIG_UNBLOCK
, &sigio_set
, NULL
);
795 nto_comctrl (int enable
)
797 struct sigevent event
;
801 event
.sigev_notify
= SIGEV_SIGNAL_THREAD
;
802 event
.sigev_signo
= SIGIO
;
803 event
.sigev_code
= 0;
804 event
.sigev_value
.sival_ptr
= NULL
;
805 event
.sigev_priority
= -1;
806 ionotify (remote_desc
, _NOTIFY_ACTION_POLLARM
, _NOTIFY_COND_INPUT
,
810 ionotify (remote_desc
, _NOTIFY_ACTION_POLL
, _NOTIFY_COND_INPUT
, NULL
);
815 /* Current state of asynchronous I/O. */
816 static int async_io_enabled
;
818 /* Enable asynchronous I/O. */
820 enable_async_io (void)
822 if (async_io_enabled
)
826 signal (SIGIO
, input_interrupt
);
828 async_io_enabled
= 1;
834 /* Disable asynchronous I/O. */
836 disable_async_io (void)
838 if (!async_io_enabled
)
842 signal (SIGIO
, SIG_IGN
);
844 async_io_enabled
= 0;
852 initialize_async_io (void)
854 /* Make sure that async I/O starts disabled. */
855 async_io_enabled
= 1;
858 /* Make sure the signal is unblocked. */
862 /* Internal buffer used by readchar.
863 These are global to readchar because reschedule_remote needs to be
864 able to tell whether the buffer is empty. */
866 static unsigned char readchar_buf
[BUFSIZ
];
867 static int readchar_bufcnt
= 0;
868 static unsigned char *readchar_bufp
;
870 /* Returns next char from remote GDB. -1 if error. */
877 if (readchar_bufcnt
== 0)
879 readchar_bufcnt
= read_prim (readchar_buf
, sizeof (readchar_buf
));
881 if (readchar_bufcnt
<= 0)
883 if (readchar_bufcnt
== 0)
884 fprintf (stderr
, "readchar: Got EOF\n");
891 readchar_bufp
= readchar_buf
;
895 ch
= *readchar_bufp
++;
900 /* Reset the readchar state machine. */
903 reset_readchar (void)
906 if (readchar_callback
!= NOT_SCHEDULED
)
908 delete_callback_event (readchar_callback
);
909 readchar_callback
= NOT_SCHEDULED
;
913 /* Process remaining data in readchar_buf. */
916 process_remaining (void *context
)
920 /* This is a one-shot event. */
921 readchar_callback
= NOT_SCHEDULED
;
923 if (readchar_bufcnt
> 0)
924 res
= handle_serial_event (0, NULL
);
931 /* If there is still data in the buffer, queue another event to process it,
932 we can't sleep in select yet. */
937 if (readchar_bufcnt
> 0 && readchar_callback
== NOT_SCHEDULED
)
938 readchar_callback
= append_callback_event (process_remaining
, NULL
);
941 /* Read a packet from the remote machine, with error checking,
942 and store it in BUF. Returns length of packet, or negative if error. */
948 unsigned char csum
, c1
, c2
;
962 fprintf (stderr
, "[getpkt: discarding char '%c']\n", c
);
983 c1
= fromhex (readchar ());
984 c2
= fromhex (readchar ());
986 if (csum
== (c1
<< 4) + c2
)
992 "Bad checksum, sentsum=0x%x, csum=0x%x, "
993 "buf=%s [no-ack-mode, Bad medium?]\n",
994 (c1
<< 4) + c2
, csum
, buf
);
995 /* Not much we can do, GDB wasn't expecting an ack/nac. */
999 fprintf (stderr
, "Bad checksum, sentsum=0x%x, csum=0x%x, buf=%s\n",
1000 (c1
<< 4) + c2
, csum
, buf
);
1001 if (write_prim ("-", 1) != 1)
1009 fprintf (stderr
, "getpkt (\"%s\"); [sending ack] \n", buf
);
1013 if (write_prim ("+", 1) != 1)
1018 fprintf (stderr
, "[sent ack]\n");
1026 fprintf (stderr
, "getpkt (\"%s\"); [no ack sent] \n", buf
);
1035 write_ok (char *buf
)
1043 write_enn (char *buf
)
1045 /* Some day, we should define the meanings of the error codes... */
1054 #ifndef IN_PROCESS_AGENT
1057 outreg (struct regcache
*regcache
, int regno
, char *buf
)
1059 if ((regno
>> 12) != 0)
1060 *buf
++ = tohex ((regno
>> 12) & 0xf);
1061 if ((regno
>> 8) != 0)
1062 *buf
++ = tohex ((regno
>> 8) & 0xf);
1063 *buf
++ = tohex ((regno
>> 4) & 0xf);
1064 *buf
++ = tohex (regno
& 0xf);
1066 collect_register_as_string (regcache
, regno
, buf
);
1067 buf
+= 2 * register_size (regcache
->tdesc
, regno
);
1074 new_thread_notify (int id
)
1078 /* The `n' response is not yet part of the remote protocol. Do nothing. */
1082 if (server_waiting
== 0)
1085 sprintf (own_buf
, "n%x", id
);
1086 disable_async_io ();
1092 dead_thread_notify (int id
)
1096 /* The `x' response is not yet part of the remote protocol. Do nothing. */
1100 sprintf (own_buf
, "x%x", id
);
1101 disable_async_io ();
1107 prepare_resume_reply (char *buf
, ptid_t ptid
,
1108 struct target_waitstatus
*status
)
1111 debug_printf ("Writing resume reply for %s:%d\n",
1112 target_pid_to_str (ptid
), status
->kind
);
1114 switch (status
->kind
)
1116 case TARGET_WAITKIND_STOPPED
:
1117 case TARGET_WAITKIND_FORKED
:
1118 case TARGET_WAITKIND_VFORKED
:
1120 struct thread_info
*saved_thread
;
1122 struct regcache
*regcache
;
1124 if ((status
->kind
== TARGET_WAITKIND_FORKED
&& report_fork_events
)
1125 || (status
->kind
== TARGET_WAITKIND_VFORKED
&& report_vfork_events
))
1127 enum gdb_signal signal
= GDB_SIGNAL_TRAP
;
1128 const char *event
= (status
->kind
== TARGET_WAITKIND_FORKED
1129 ? "fork" : "vfork");
1131 sprintf (buf
, "T%02x%s:", signal
, event
);
1132 buf
+= strlen (buf
);
1133 buf
= write_ptid (buf
, status
->value
.related_pid
);
1137 sprintf (buf
, "T%02x", status
->value
.sig
);
1139 buf
+= strlen (buf
);
1141 saved_thread
= current_thread
;
1143 current_thread
= find_thread_ptid (ptid
);
1145 regp
= current_target_desc ()->expedite_regs
;
1147 regcache
= get_thread_regcache (current_thread
, 1);
1149 if (the_target
->stopped_by_watchpoint
!= NULL
1150 && (*the_target
->stopped_by_watchpoint
) ())
1155 strncpy (buf
, "watch:", 6);
1158 addr
= (*the_target
->stopped_data_address
) ();
1160 /* Convert each byte of the address into two hexadecimal
1161 chars. Note that we take sizeof (void *) instead of
1162 sizeof (addr); this is to avoid sending a 64-bit
1163 address to a 32-bit GDB. */
1164 for (i
= sizeof (void *) * 2; i
> 0; i
--)
1165 *buf
++ = tohex ((addr
>> (i
- 1) * 4) & 0xf);
1168 else if (swbreak_feature
&& target_stopped_by_sw_breakpoint ())
1170 sprintf (buf
, "swbreak:;");
1171 buf
+= strlen (buf
);
1173 else if (hwbreak_feature
&& target_stopped_by_hw_breakpoint ())
1175 sprintf (buf
, "hwbreak:;");
1176 buf
+= strlen (buf
);
1181 buf
= outreg (regcache
, find_regno (regcache
->tdesc
, *regp
), buf
);
1186 /* Formerly, if the debugger had not used any thread features
1187 we would not burden it with a thread status response. This
1188 was for the benefit of GDB 4.13 and older. However, in
1189 recent GDB versions the check (``if (cont_thread != 0)'')
1190 does not have the desired effect because of sillyness in
1191 the way that the remote protocol handles specifying a
1192 thread. Since thread support relies on qSymbol support
1193 anyway, assume GDB can handle threads. */
1195 if (using_threads
&& !disable_packet_Tthread
)
1197 /* This if (1) ought to be unnecessary. But remote_wait
1198 in GDB will claim this event belongs to inferior_ptid
1199 if we do not specify a thread, and there's no way for
1200 gdbserver to know what inferior_ptid is. */
1201 if (1 || !ptid_equal (general_thread
, ptid
))
1204 /* In non-stop, don't change the general thread behind
1207 general_thread
= ptid
;
1208 sprintf (buf
, "thread:");
1209 buf
+= strlen (buf
);
1210 buf
= write_ptid (buf
, ptid
);
1212 buf
+= strlen (buf
);
1214 core
= target_core_of_thread (ptid
);
1218 sprintf (buf
, "core:");
1219 buf
+= strlen (buf
);
1220 sprintf (buf
, "%x", core
);
1222 buf
+= strlen (buf
);
1229 strcpy (buf
, "library:;");
1230 buf
+= strlen (buf
);
1234 current_thread
= saved_thread
;
1237 case TARGET_WAITKIND_EXITED
:
1239 sprintf (buf
, "W%x;process:%x",
1240 status
->value
.integer
, ptid_get_pid (ptid
));
1242 sprintf (buf
, "W%02x", status
->value
.integer
);
1244 case TARGET_WAITKIND_SIGNALLED
:
1246 sprintf (buf
, "X%x;process:%x",
1247 status
->value
.sig
, ptid_get_pid (ptid
));
1249 sprintf (buf
, "X%02x", status
->value
.sig
);
1251 case TARGET_WAITKIND_VFORK_DONE
:
1252 if (report_vfork_events
)
1254 enum gdb_signal signal
= GDB_SIGNAL_TRAP
;
1256 sprintf (buf
, "T%02xvforkdone:;", signal
);
1259 sprintf (buf
, "T%02x", GDB_SIGNAL_0
);
1262 error ("unhandled waitkind");
1268 decode_m_packet (char *from
, CORE_ADDR
*mem_addr_ptr
, unsigned int *len_ptr
)
1272 *mem_addr_ptr
= *len_ptr
= 0;
1274 while ((ch
= from
[i
++]) != ',')
1276 *mem_addr_ptr
= *mem_addr_ptr
<< 4;
1277 *mem_addr_ptr
|= fromhex (ch
) & 0x0f;
1280 for (j
= 0; j
< 4; j
++)
1282 if ((ch
= from
[i
++]) == 0)
1284 *len_ptr
= *len_ptr
<< 4;
1285 *len_ptr
|= fromhex (ch
) & 0x0f;
1290 decode_M_packet (char *from
, CORE_ADDR
*mem_addr_ptr
, unsigned int *len_ptr
,
1291 unsigned char **to_p
)
1295 *mem_addr_ptr
= *len_ptr
= 0;
1297 while ((ch
= from
[i
++]) != ',')
1299 *mem_addr_ptr
= *mem_addr_ptr
<< 4;
1300 *mem_addr_ptr
|= fromhex (ch
) & 0x0f;
1303 while ((ch
= from
[i
++]) != ':')
1305 *len_ptr
= *len_ptr
<< 4;
1306 *len_ptr
|= fromhex (ch
) & 0x0f;
1310 *to_p
= xmalloc (*len_ptr
);
1312 hex2bin (&from
[i
++], *to_p
, *len_ptr
);
1316 decode_X_packet (char *from
, int packet_len
, CORE_ADDR
*mem_addr_ptr
,
1317 unsigned int *len_ptr
, unsigned char **to_p
)
1321 *mem_addr_ptr
= *len_ptr
= 0;
1323 while ((ch
= from
[i
++]) != ',')
1325 *mem_addr_ptr
= *mem_addr_ptr
<< 4;
1326 *mem_addr_ptr
|= fromhex (ch
) & 0x0f;
1329 while ((ch
= from
[i
++]) != ':')
1331 *len_ptr
= *len_ptr
<< 4;
1332 *len_ptr
|= fromhex (ch
) & 0x0f;
1336 *to_p
= xmalloc (*len_ptr
);
1338 if (remote_unescape_input ((const gdb_byte
*) &from
[i
], packet_len
- i
,
1339 *to_p
, *len_ptr
) != *len_ptr
)
1345 /* Decode a qXfer write request. */
1348 decode_xfer_write (char *buf
, int packet_len
, CORE_ADDR
*offset
,
1349 unsigned int *len
, unsigned char *data
)
1354 /* Extract the offset. */
1356 while ((ch
= *buf
++) != ':')
1358 *offset
= *offset
<< 4;
1359 *offset
|= fromhex (ch
) & 0x0f;
1362 /* Get encoded data. */
1363 packet_len
-= buf
- b
;
1364 *len
= remote_unescape_input ((const gdb_byte
*) buf
, packet_len
,
1369 /* Decode the parameters of a qSearch:memory packet. */
1372 decode_search_memory_packet (const char *buf
, int packet_len
,
1373 CORE_ADDR
*start_addrp
,
1374 CORE_ADDR
*search_space_lenp
,
1375 gdb_byte
*pattern
, unsigned int *pattern_lenp
)
1377 const char *p
= buf
;
1379 p
= decode_address_to_semicolon (start_addrp
, p
);
1380 p
= decode_address_to_semicolon (search_space_lenp
, p
);
1381 packet_len
-= p
- buf
;
1382 *pattern_lenp
= remote_unescape_input ((const gdb_byte
*) p
, packet_len
,
1383 pattern
, packet_len
);
1388 free_sym_cache (struct sym_cache
*sym
)
1398 clear_symbol_cache (struct sym_cache
**symcache_p
)
1400 struct sym_cache
*sym
, *next
;
1402 /* Check the cache first. */
1403 for (sym
= *symcache_p
; sym
; sym
= next
)
1406 free_sym_cache (sym
);
1412 /* Get the address of NAME, and return it in ADDRP if found. if
1413 MAY_ASK_GDB is false, assume symbol cache misses are failures.
1414 Returns 1 if the symbol is found, 0 if it is not, -1 on error. */
1417 look_up_one_symbol (const char *name
, CORE_ADDR
*addrp
, int may_ask_gdb
)
1419 char own_buf
[266], *p
, *q
;
1421 struct sym_cache
*sym
;
1422 struct process_info
*proc
;
1424 proc
= current_process ();
1426 /* Check the cache first. */
1427 for (sym
= proc
->symbol_cache
; sym
; sym
= sym
->next
)
1428 if (strcmp (name
, sym
->name
) == 0)
1434 /* It might not be an appropriate time to look up a symbol,
1435 e.g. while we're trying to fetch registers. */
1439 /* Send the request. */
1440 strcpy (own_buf
, "qSymbol:");
1441 bin2hex ((const gdb_byte
*) name
, own_buf
+ strlen ("qSymbol:"),
1443 if (putpkt (own_buf
) < 0)
1446 /* FIXME: Eventually add buffer overflow checking (to getpkt?) */
1447 len
= getpkt (own_buf
);
1451 /* We ought to handle pretty much any packet at this point while we
1452 wait for the qSymbol "response". That requires re-entering the
1453 main loop. For now, this is an adequate approximation; allow
1454 GDB to read from memory while it figures out the address of the
1456 while (own_buf
[0] == 'm')
1459 unsigned char *mem_buf
;
1460 unsigned int mem_len
;
1462 decode_m_packet (&own_buf
[1], &mem_addr
, &mem_len
);
1463 mem_buf
= xmalloc (mem_len
);
1464 if (read_inferior_memory (mem_addr
, mem_buf
, mem_len
) == 0)
1465 bin2hex (mem_buf
, own_buf
, mem_len
);
1467 write_enn (own_buf
);
1469 if (putpkt (own_buf
) < 0)
1471 len
= getpkt (own_buf
);
1476 if (!startswith (own_buf
, "qSymbol:"))
1478 warning ("Malformed response to qSymbol, ignoring: %s\n", own_buf
);
1482 p
= own_buf
+ strlen ("qSymbol:");
1484 while (*q
&& *q
!= ':')
1487 /* Make sure we found a value for the symbol. */
1488 if (p
== q
|| *q
== '\0')
1491 decode_address (addrp
, p
, q
- p
);
1493 /* Save the symbol in our cache. */
1494 sym
= xmalloc (sizeof (*sym
));
1495 sym
->name
= xstrdup (name
);
1497 sym
->next
= proc
->symbol_cache
;
1498 proc
->symbol_cache
= sym
;
1503 /* Relocate an instruction to execute at a different address. OLDLOC
1504 is the address in the inferior memory where the instruction to
1505 relocate is currently at. On input, TO points to the destination
1506 where we want the instruction to be copied (and possibly adjusted)
1507 to. On output, it points to one past the end of the resulting
1508 instruction(s). The effect of executing the instruction at TO
1509 shall be the same as if executing it at OLDLOC. For example, call
1510 instructions that implicitly push the return address on the stack
1511 should be adjusted to return to the instruction after OLDLOC;
1512 relative branches, and other PC-relative instructions need the
1513 offset adjusted; etc. Returns 0 on success, -1 on failure. */
1516 relocate_instruction (CORE_ADDR
*to
, CORE_ADDR oldloc
)
1520 ULONGEST written
= 0;
1522 /* Send the request. */
1523 strcpy (own_buf
, "qRelocInsn:");
1524 sprintf (own_buf
, "qRelocInsn:%s;%s", paddress (oldloc
),
1526 if (putpkt (own_buf
) < 0)
1529 /* FIXME: Eventually add buffer overflow checking (to getpkt?) */
1530 len
= getpkt (own_buf
);
1534 /* We ought to handle pretty much any packet at this point while we
1535 wait for the qRelocInsn "response". That requires re-entering
1536 the main loop. For now, this is an adequate approximation; allow
1537 GDB to access memory. */
1538 while (own_buf
[0] == 'm' || own_buf
[0] == 'M' || own_buf
[0] == 'X')
1541 unsigned char *mem_buf
= NULL
;
1542 unsigned int mem_len
;
1544 if (own_buf
[0] == 'm')
1546 decode_m_packet (&own_buf
[1], &mem_addr
, &mem_len
);
1547 mem_buf
= xmalloc (mem_len
);
1548 if (read_inferior_memory (mem_addr
, mem_buf
, mem_len
) == 0)
1549 bin2hex (mem_buf
, own_buf
, mem_len
);
1551 write_enn (own_buf
);
1553 else if (own_buf
[0] == 'X')
1555 if (decode_X_packet (&own_buf
[1], len
- 1, &mem_addr
,
1556 &mem_len
, &mem_buf
) < 0
1557 || write_inferior_memory (mem_addr
, mem_buf
, mem_len
) != 0)
1558 write_enn (own_buf
);
1564 decode_M_packet (&own_buf
[1], &mem_addr
, &mem_len
, &mem_buf
);
1565 if (write_inferior_memory (mem_addr
, mem_buf
, mem_len
) == 0)
1568 write_enn (own_buf
);
1571 if (putpkt (own_buf
) < 0)
1573 len
= getpkt (own_buf
);
1578 if (own_buf
[0] == 'E')
1580 warning ("An error occurred while relocating an instruction: %s\n",
1585 if (!startswith (own_buf
, "qRelocInsn:"))
1587 warning ("Malformed response to qRelocInsn, ignoring: %s\n",
1592 unpack_varlen_hex (own_buf
+ strlen ("qRelocInsn:"), &written
);
1599 monitor_output (const char *msg
)
1601 int len
= strlen (msg
);
1602 char *buf
= xmalloc (len
* 2 + 2);
1605 bin2hex ((const gdb_byte
*) msg
, buf
+ 1, len
);