1 /* Shared utility routines for GDB to interact with agent.
3 Copyright (C) 2009-2014 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
30 #include "filestuff.h"
34 /* A stdarg wrapper for debug_vprintf. */
36 static void ATTRIBUTE_PRINTF (1, 2)
37 debug_agent_printf (const char *fmt
, ...)
44 debug_vprintf (fmt
, ap
);
48 #define DEBUG_AGENT debug_agent_printf
50 /* Global flag to determine using agent or not. */
53 /* Addresses of in-process agent's symbols both GDB and GDBserver cares
56 struct ipa_sym_addresses
58 CORE_ADDR addr_helper_thread_id
;
59 CORE_ADDR addr_cmd_buf
;
60 CORE_ADDR addr_capability
;
63 /* Cache of the helper thread id. FIXME: this global should be made
65 static unsigned int helper_thread_id
= 0;
73 IPA_SYM(helper_thread_id
),
78 static struct ipa_sym_addresses ipa_sym_addrs
;
80 static int all_agent_symbols_looked_up
= 0;
85 return all_agent_symbols_looked_up
;
88 /* Look up all symbols needed by agent. Return 0 if all the symbols are
89 found, return non-zero otherwise. */
92 agent_look_up_symbols (void *arg
)
96 all_agent_symbols_looked_up
= 0;
98 for (i
= 0; i
< sizeof (symbol_list
) / sizeof (symbol_list
[0]); i
++)
101 (CORE_ADDR
*) ((char *) &ipa_sym_addrs
+ symbol_list
[i
].offset
);
104 if (look_up_one_symbol (symbol_list
[i
].name
, addrp
, 1) == 0)
106 struct bound_minimal_symbol sym
=
107 lookup_minimal_symbol (symbol_list
[i
].name
, NULL
,
108 (struct objfile
*) arg
);
110 if (sym
.minsym
!= NULL
)
111 *addrp
= BMSYMBOL_VALUE_ADDRESS (sym
);
115 DEBUG_AGENT ("symbol `%s' not found\n", symbol_list
[i
].name
);
120 all_agent_symbols_looked_up
= 1;
125 agent_get_helper_thread_id (void)
127 if (helper_thread_id
== 0)
130 if (read_inferior_memory (ipa_sym_addrs
.addr_helper_thread_id
,
131 (unsigned char *) &helper_thread_id
,
132 sizeof helper_thread_id
))
134 enum bfd_endian byte_order
= gdbarch_byte_order (target_gdbarch ());
137 if (target_read_memory (ipa_sym_addrs
.addr_helper_thread_id
,
138 buf
, sizeof buf
) == 0)
139 helper_thread_id
= extract_unsigned_integer (buf
, sizeof buf
,
144 warning (_("Error reading helper thread's id in lib"));
148 return helper_thread_id
;
152 #include <sys/socket.h>
154 #define SOCK_DIR P_tmpdir
156 #ifndef UNIX_PATH_MAX
157 #define UNIX_PATH_MAX sizeof(((struct sockaddr_un *) NULL)->sun_path)
162 /* Connects to synchronization socket. PID is the pid of inferior, which is
163 used to set up the connection socket. */
166 gdb_connect_sync_socket (int pid
)
169 struct sockaddr_un addr
;
171 char path
[UNIX_PATH_MAX
];
173 res
= xsnprintf (path
, UNIX_PATH_MAX
, "%s/gdb_ust%d", P_tmpdir
, pid
);
174 if (res
>= UNIX_PATH_MAX
)
177 res
= fd
= gdb_socket_cloexec (PF_UNIX
, SOCK_STREAM
, 0);
180 warning (_("error opening sync socket: %s"), strerror (errno
));
184 addr
.sun_family
= AF_UNIX
;
186 res
= xsnprintf (addr
.sun_path
, UNIX_PATH_MAX
, "%s", path
);
187 if (res
>= UNIX_PATH_MAX
)
189 warning (_("string overflow allocating socket name"));
194 res
= connect (fd
, (struct sockaddr
*) &addr
, sizeof (addr
));
197 warning (_("error connecting sync socket (%s): %s. "
198 "Make sure the directory exists and that it is writable."),
199 path
, strerror (errno
));
210 /* Execute an agent command in the inferior. PID is the value of pid of the
211 inferior. CMD is the buffer for command. GDB or GDBserver will store the
212 command into it and fetch the return result from CMD. The interaction
213 between GDB/GDBserver and the agent is synchronized by a synchronization
214 socket. Return zero if success, otherwise return non-zero. */
217 agent_run_command (int pid
, const char *cmd
, int len
)
220 int tid
= agent_get_helper_thread_id ();
221 ptid_t ptid
= ptid_build (pid
, tid
, 0);
224 int ret
= write_inferior_memory (ipa_sym_addrs
.addr_cmd_buf
,
225 (const unsigned char *) cmd
, len
);
227 int ret
= target_write_memory (ipa_sym_addrs
.addr_cmd_buf
,
228 (gdb_byte
*) cmd
, len
);
233 warning (_("unable to write"));
237 DEBUG_AGENT ("agent: resumed helper thread\n");
239 /* Resume helper thread. */
242 struct thread_resume resume_info
;
244 resume_info
.thread
= ptid
;
245 resume_info
.kind
= resume_continue
;
246 resume_info
.sig
= GDB_SIGNAL_0
;
247 (*the_target
->resume
) (&resume_info
, 1);
250 target_resume (ptid
, 0, GDB_SIGNAL_0
);
253 fd
= gdb_connect_sync_socket (pid
);
259 DEBUG_AGENT ("agent: signalling helper thread\n");
263 ret
= write (fd
, buf
, 1);
264 } while (ret
== -1 && errno
== EINTR
);
266 DEBUG_AGENT ("agent: waiting for helper thread's response\n");
270 ret
= read (fd
, buf
, 1);
271 } while (ret
== -1 && errno
== EINTR
);
275 DEBUG_AGENT ("agent: helper thread's response received\n");
280 /* Need to read response with the inferior stopped. */
281 if (!ptid_equal (ptid
, null_ptid
))
283 struct target_waitstatus status
;
284 int was_non_stop
= non_stop
;
285 /* Stop thread PTID. */
286 DEBUG_AGENT ("agent: stop helper thread\n");
289 struct thread_resume resume_info
;
291 resume_info
.thread
= ptid
;
292 resume_info
.kind
= resume_stop
;
293 resume_info
.sig
= GDB_SIGNAL_0
;
294 (*the_target
->resume
) (&resume_info
, 1);
298 mywait (ptid
, &status
, 0, 0);
303 memset (&status
, 0, sizeof (status
));
304 target_wait (ptid
, &status
, 0);
306 non_stop
= was_non_stop
;
312 if (read_inferior_memory (ipa_sym_addrs
.addr_cmd_buf
,
313 (unsigned char *) cmd
, IPA_CMD_BUF_SIZE
))
315 if (target_read_memory (ipa_sym_addrs
.addr_cmd_buf
, (gdb_byte
*) cmd
,
319 warning (_("Error reading command response"));
327 /* Each bit of it stands for a capability of agent. */
328 static unsigned int agent_capability
= 0;
330 /* Return true if agent has capability AGENT_CAP, otherwise return false. */
333 agent_capability_check (enum agent_capa agent_capa
)
335 if (agent_capability
== 0)
338 if (read_inferior_memory (ipa_sym_addrs
.addr_capability
,
339 (unsigned char *) &agent_capability
,
340 sizeof agent_capability
))
342 enum bfd_endian byte_order
= gdbarch_byte_order (target_gdbarch ());
345 if (target_read_memory (ipa_sym_addrs
.addr_capability
,
346 buf
, sizeof buf
) == 0)
347 agent_capability
= extract_unsigned_integer (buf
, sizeof buf
,
351 warning (_("Error reading capability of agent"));
353 return agent_capability
& agent_capa
;
356 /* Invalidate the cache of agent capability, so we'll read it from inferior
357 again. Call it when launches a new program or reconnect to remote stub. */
360 agent_capability_invalidate (void)
362 agent_capability
= 0;