1 /* Shared utility routines for GDB to interact with agent.
3 Copyright (C) 2009-2015 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/>. */
20 #include "common-defs.h"
21 #include "target/target.h"
22 #include "common/symbol.h"
25 #include "filestuff.h"
29 /* A stdarg wrapper for debug_vprintf. */
31 static void ATTRIBUTE_PRINTF (1, 2)
32 debug_agent_printf (const char *fmt
, ...)
39 debug_vprintf (fmt
, ap
);
43 #define DEBUG_AGENT debug_agent_printf
45 /* Global flag to determine using agent or not. */
48 /* Addresses of in-process agent's symbols both GDB and GDBserver cares
51 struct ipa_sym_addresses
53 CORE_ADDR addr_helper_thread_id
;
54 CORE_ADDR addr_cmd_buf
;
55 CORE_ADDR addr_capability
;
58 /* Cache of the helper thread id. FIXME: this global should be made
60 static uint32_t helper_thread_id
= 0;
67 IPA_SYM(helper_thread_id
),
72 static struct ipa_sym_addresses ipa_sym_addrs
;
74 static int all_agent_symbols_looked_up
= 0;
79 return all_agent_symbols_looked_up
;
82 /* Look up all symbols needed by agent. Return 0 if all the symbols are
83 found, return non-zero otherwise. */
86 agent_look_up_symbols (void *arg
)
90 all_agent_symbols_looked_up
= 0;
92 for (i
= 0; i
< sizeof (symbol_list
) / sizeof (symbol_list
[0]); i
++)
95 (CORE_ADDR
*) ((char *) &ipa_sym_addrs
+ symbol_list
[i
].offset
);
97 if (find_minimal_symbol_address (symbol_list
[i
].name
, addrp
,
100 DEBUG_AGENT ("symbol `%s' not found\n", symbol_list
[i
].name
);
105 all_agent_symbols_looked_up
= 1;
110 agent_get_helper_thread_id (void)
112 if (helper_thread_id
== 0)
114 if (target_read_uint32 (ipa_sym_addrs
.addr_helper_thread_id
,
116 warning (_("Error reading helper thread's id in lib"));
119 return helper_thread_id
;
123 #include <sys/socket.h>
125 #define SOCK_DIR P_tmpdir
127 #ifndef UNIX_PATH_MAX
128 #define UNIX_PATH_MAX sizeof(((struct sockaddr_un *) NULL)->sun_path)
133 /* Connects to synchronization socket. PID is the pid of inferior, which is
134 used to set up the connection socket. */
137 gdb_connect_sync_socket (int pid
)
140 struct sockaddr_un addr
;
142 char path
[UNIX_PATH_MAX
];
144 res
= xsnprintf (path
, UNIX_PATH_MAX
, "%s/gdb_ust%d", P_tmpdir
, pid
);
145 if (res
>= UNIX_PATH_MAX
)
148 res
= fd
= gdb_socket_cloexec (PF_UNIX
, SOCK_STREAM
, 0);
151 warning (_("error opening sync socket: %s"), strerror (errno
));
155 addr
.sun_family
= AF_UNIX
;
157 res
= xsnprintf (addr
.sun_path
, UNIX_PATH_MAX
, "%s", path
);
158 if (res
>= UNIX_PATH_MAX
)
160 warning (_("string overflow allocating socket name"));
165 res
= connect (fd
, (struct sockaddr
*) &addr
, sizeof (addr
));
168 warning (_("error connecting sync socket (%s): %s. "
169 "Make sure the directory exists and that it is writable."),
170 path
, strerror (errno
));
181 /* Execute an agent command in the inferior. PID is the value of pid of the
182 inferior. CMD is the buffer for command. GDB or GDBserver will store the
183 command into it and fetch the return result from CMD. The interaction
184 between GDB/GDBserver and the agent is synchronized by a synchronization
185 socket. Return zero if success, otherwise return non-zero. */
188 agent_run_command (int pid
, const char *cmd
, int len
)
191 int tid
= agent_get_helper_thread_id ();
192 ptid_t ptid
= ptid_build (pid
, tid
, 0);
194 int ret
= target_write_memory (ipa_sym_addrs
.addr_cmd_buf
,
195 (gdb_byte
*) cmd
, len
);
199 warning (_("unable to write"));
203 DEBUG_AGENT ("agent: resumed helper thread\n");
205 /* Resume helper thread. */
206 target_continue_no_signal (ptid
);
208 fd
= gdb_connect_sync_socket (pid
);
214 DEBUG_AGENT ("agent: signalling helper thread\n");
218 ret
= write (fd
, buf
, 1);
219 } while (ret
== -1 && errno
== EINTR
);
221 DEBUG_AGENT ("agent: waiting for helper thread's response\n");
225 ret
= read (fd
, buf
, 1);
226 } while (ret
== -1 && errno
== EINTR
);
230 DEBUG_AGENT ("agent: helper thread's response received\n");
235 /* Need to read response with the inferior stopped. */
236 if (!ptid_equal (ptid
, null_ptid
))
238 /* Stop thread PTID. */
239 DEBUG_AGENT ("agent: stop helper thread\n");
240 target_stop_and_wait (ptid
);
245 if (target_read_memory (ipa_sym_addrs
.addr_cmd_buf
, (gdb_byte
*) cmd
,
248 warning (_("Error reading command response"));
256 /* Each bit of it stands for a capability of agent. */
257 static uint32_t agent_capability
= 0;
259 /* Return true if agent has capability AGENT_CAP, otherwise return false. */
262 agent_capability_check (enum agent_capa agent_capa
)
264 if (agent_capability
== 0)
266 if (target_read_uint32 (ipa_sym_addrs
.addr_capability
,
268 warning (_("Error reading capability of agent"));
270 return agent_capability
& agent_capa
;
273 /* Invalidate the cache of agent capability, so we'll read it from inferior
274 again. Call it when launches a new program or reconnect to remote stub. */
277 agent_capability_invalidate (void)
279 agent_capability
= 0;