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2fa291ac YQ |
1 | /* Shared utility routines for GDB to interact with agent. |
2 | ||
ecd75fc8 | 3 | Copyright (C) 2009-2014 Free Software Foundation, Inc. |
2fa291ac YQ |
4 | |
5 | This file is part of GDB. | |
6 | ||
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. | |
11 | ||
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. | |
16 | ||
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/>. */ | |
19 | ||
20 | #ifdef GDBSERVER | |
21 | #include "server.h" | |
22 | #else | |
23 | #include "defs.h" | |
24 | #include "target.h" | |
45741a9c | 25 | #include "infrun.h" |
77e371c0 | 26 | #include "objfiles.h" |
2fa291ac YQ |
27 | #endif |
28 | ||
29 | #include <string.h> | |
30 | #include <unistd.h> | |
31 | #include "agent.h" | |
614c279d | 32 | #include "filestuff.h" |
2fa291ac YQ |
33 | |
34 | int debug_agent = 0; | |
35 | ||
36 | #ifdef GDBSERVER | |
37 | #define DEBUG_AGENT(fmt, args...) \ | |
38 | if (debug_agent) \ | |
39 | fprintf (stderr, fmt, ##args); | |
40 | #else | |
41 | #define DEBUG_AGENT(fmt, args...) \ | |
42 | if (debug_agent) \ | |
43 | fprintf_unfiltered (gdb_stdlog, fmt, ##args); | |
44 | #endif | |
45 | ||
d1feda86 YQ |
46 | /* Global flag to determine using agent or not. */ |
47 | int use_agent = 0; | |
48 | ||
2fa291ac YQ |
49 | /* Addresses of in-process agent's symbols both GDB and GDBserver cares |
50 | about. */ | |
51 | ||
52 | struct ipa_sym_addresses | |
53 | { | |
54 | CORE_ADDR addr_helper_thread_id; | |
55 | CORE_ADDR addr_cmd_buf; | |
8ffcbaaf | 56 | CORE_ADDR addr_capability; |
2fa291ac YQ |
57 | }; |
58 | ||
59 | /* Cache of the helper thread id. FIXME: this global should be made | |
60 | per-process. */ | |
61 | static unsigned int helper_thread_id = 0; | |
62 | ||
63 | static struct | |
64 | { | |
65 | const char *name; | |
66 | int offset; | |
67 | int required; | |
68 | } symbol_list[] = { | |
69 | IPA_SYM(helper_thread_id), | |
70 | IPA_SYM(cmd_buf), | |
8ffcbaaf | 71 | IPA_SYM(capability), |
2fa291ac YQ |
72 | }; |
73 | ||
74 | static struct ipa_sym_addresses ipa_sym_addrs; | |
75 | ||
58b4daa5 YQ |
76 | static int all_agent_symbols_looked_up = 0; |
77 | ||
78 | int | |
79 | agent_loaded_p (void) | |
80 | { | |
81 | return all_agent_symbols_looked_up; | |
82 | } | |
83 | ||
2fa291ac YQ |
84 | /* Look up all symbols needed by agent. Return 0 if all the symbols are |
85 | found, return non-zero otherwise. */ | |
86 | ||
87 | int | |
5808517f | 88 | agent_look_up_symbols (void *arg) |
2fa291ac YQ |
89 | { |
90 | int i; | |
91 | ||
58b4daa5 YQ |
92 | all_agent_symbols_looked_up = 0; |
93 | ||
2fa291ac YQ |
94 | for (i = 0; i < sizeof (symbol_list) / sizeof (symbol_list[0]); i++) |
95 | { | |
96 | CORE_ADDR *addrp = | |
97 | (CORE_ADDR *) ((char *) &ipa_sym_addrs + symbol_list[i].offset); | |
98 | #ifdef GDBSERVER | |
99 | ||
100 | if (look_up_one_symbol (symbol_list[i].name, addrp, 1) == 0) | |
101 | #else | |
3b7344d5 | 102 | struct bound_minimal_symbol sym = |
5808517f YQ |
103 | lookup_minimal_symbol (symbol_list[i].name, NULL, |
104 | (struct objfile *) arg); | |
2fa291ac | 105 | |
3b7344d5 | 106 | if (sym.minsym != NULL) |
77e371c0 | 107 | *addrp = BMSYMBOL_VALUE_ADDRESS (sym); |
2fa291ac YQ |
108 | else |
109 | #endif | |
110 | { | |
111 | DEBUG_AGENT ("symbol `%s' not found\n", symbol_list[i].name); | |
112 | return -1; | |
113 | } | |
114 | } | |
115 | ||
58b4daa5 | 116 | all_agent_symbols_looked_up = 1; |
2fa291ac YQ |
117 | return 0; |
118 | } | |
119 | ||
120 | static unsigned int | |
121 | agent_get_helper_thread_id (void) | |
122 | { | |
123 | if (helper_thread_id == 0) | |
124 | { | |
125 | #ifdef GDBSERVER | |
126 | if (read_inferior_memory (ipa_sym_addrs.addr_helper_thread_id, | |
127 | (unsigned char *) &helper_thread_id, | |
128 | sizeof helper_thread_id)) | |
129 | #else | |
f5656ead | 130 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
2fa291ac YQ |
131 | gdb_byte buf[4]; |
132 | ||
133 | if (target_read_memory (ipa_sym_addrs.addr_helper_thread_id, | |
134 | buf, sizeof buf) == 0) | |
135 | helper_thread_id = extract_unsigned_integer (buf, sizeof buf, | |
136 | byte_order); | |
137 | else | |
138 | #endif | |
139 | { | |
87399aa1 | 140 | warning (_("Error reading helper thread's id in lib")); |
2fa291ac YQ |
141 | } |
142 | } | |
143 | ||
144 | return helper_thread_id; | |
145 | } | |
146 | ||
147 | #ifdef HAVE_SYS_UN_H | |
148 | #include <sys/socket.h> | |
149 | #include <sys/un.h> | |
150 | #define SOCK_DIR P_tmpdir | |
151 | ||
152 | #ifndef UNIX_PATH_MAX | |
153 | #define UNIX_PATH_MAX sizeof(((struct sockaddr_un *) NULL)->sun_path) | |
154 | #endif | |
155 | ||
156 | #endif | |
157 | ||
158 | /* Connects to synchronization socket. PID is the pid of inferior, which is | |
159 | used to set up the connection socket. */ | |
160 | ||
161 | static int | |
162 | gdb_connect_sync_socket (int pid) | |
163 | { | |
164 | #ifdef HAVE_SYS_UN_H | |
165 | struct sockaddr_un addr; | |
166 | int res, fd; | |
167 | char path[UNIX_PATH_MAX]; | |
168 | ||
169 | res = xsnprintf (path, UNIX_PATH_MAX, "%s/gdb_ust%d", P_tmpdir, pid); | |
170 | if (res >= UNIX_PATH_MAX) | |
171 | return -1; | |
172 | ||
614c279d | 173 | res = fd = gdb_socket_cloexec (PF_UNIX, SOCK_STREAM, 0); |
2fa291ac YQ |
174 | if (res == -1) |
175 | { | |
87399aa1 | 176 | warning (_("error opening sync socket: %s"), strerror (errno)); |
2fa291ac YQ |
177 | return -1; |
178 | } | |
179 | ||
180 | addr.sun_family = AF_UNIX; | |
181 | ||
182 | res = xsnprintf (addr.sun_path, UNIX_PATH_MAX, "%s", path); | |
183 | if (res >= UNIX_PATH_MAX) | |
184 | { | |
87399aa1 | 185 | warning (_("string overflow allocating socket name")); |
2fa291ac YQ |
186 | close (fd); |
187 | return -1; | |
188 | } | |
189 | ||
190 | res = connect (fd, (struct sockaddr *) &addr, sizeof (addr)); | |
191 | if (res == -1) | |
192 | { | |
87399aa1 YQ |
193 | warning (_("error connecting sync socket (%s): %s. " |
194 | "Make sure the directory exists and that it is writable."), | |
195 | path, strerror (errno)); | |
2fa291ac YQ |
196 | close (fd); |
197 | return -1; | |
198 | } | |
199 | ||
200 | return fd; | |
201 | #else | |
202 | return -1; | |
203 | #endif | |
204 | } | |
205 | ||
206 | /* Execute an agent command in the inferior. PID is the value of pid of the | |
207 | inferior. CMD is the buffer for command. GDB or GDBserver will store the | |
208 | command into it and fetch the return result from CMD. The interaction | |
209 | between GDB/GDBserver and the agent is synchronized by a synchronization | |
210 | socket. Return zero if success, otherwise return non-zero. */ | |
211 | ||
212 | int | |
42476b70 | 213 | agent_run_command (int pid, const char *cmd, int len) |
2fa291ac YQ |
214 | { |
215 | int fd; | |
216 | int tid = agent_get_helper_thread_id (); | |
217 | ptid_t ptid = ptid_build (pid, tid, 0); | |
2fa291ac YQ |
218 | |
219 | #ifdef GDBSERVER | |
220 | int ret = write_inferior_memory (ipa_sym_addrs.addr_cmd_buf, | |
221 | (const unsigned char *) cmd, len); | |
222 | #else | |
fda0389f PA |
223 | int ret = target_write_memory (ipa_sym_addrs.addr_cmd_buf, |
224 | (gdb_byte *) cmd, len); | |
2fa291ac YQ |
225 | #endif |
226 | ||
227 | if (ret != 0) | |
228 | { | |
87399aa1 | 229 | warning (_("unable to write")); |
2fa291ac YQ |
230 | return -1; |
231 | } | |
232 | ||
233 | DEBUG_AGENT ("agent: resumed helper thread\n"); | |
234 | ||
235 | /* Resume helper thread. */ | |
236 | #ifdef GDBSERVER | |
237 | { | |
238 | struct thread_resume resume_info; | |
239 | ||
240 | resume_info.thread = ptid; | |
241 | resume_info.kind = resume_continue; | |
a493e3e2 | 242 | resume_info.sig = GDB_SIGNAL_0; |
2fa291ac YQ |
243 | (*the_target->resume) (&resume_info, 1); |
244 | } | |
245 | #else | |
a493e3e2 | 246 | target_resume (ptid, 0, GDB_SIGNAL_0); |
2fa291ac YQ |
247 | #endif |
248 | ||
249 | fd = gdb_connect_sync_socket (pid); | |
250 | if (fd >= 0) | |
251 | { | |
252 | char buf[1] = ""; | |
253 | int ret; | |
254 | ||
255 | DEBUG_AGENT ("agent: signalling helper thread\n"); | |
256 | ||
257 | do | |
258 | { | |
259 | ret = write (fd, buf, 1); | |
260 | } while (ret == -1 && errno == EINTR); | |
261 | ||
262 | DEBUG_AGENT ("agent: waiting for helper thread's response\n"); | |
263 | ||
264 | do | |
265 | { | |
266 | ret = read (fd, buf, 1); | |
267 | } while (ret == -1 && errno == EINTR); | |
268 | ||
269 | close (fd); | |
270 | ||
271 | DEBUG_AGENT ("agent: helper thread's response received\n"); | |
272 | } | |
273 | else | |
274 | return -1; | |
275 | ||
276 | /* Need to read response with the inferior stopped. */ | |
277 | if (!ptid_equal (ptid, null_ptid)) | |
278 | { | |
279 | struct target_waitstatus status; | |
280 | int was_non_stop = non_stop; | |
281 | /* Stop thread PTID. */ | |
282 | DEBUG_AGENT ("agent: stop helper thread\n"); | |
283 | #ifdef GDBSERVER | |
284 | { | |
285 | struct thread_resume resume_info; | |
286 | ||
287 | resume_info.thread = ptid; | |
288 | resume_info.kind = resume_stop; | |
a493e3e2 | 289 | resume_info.sig = GDB_SIGNAL_0; |
2fa291ac YQ |
290 | (*the_target->resume) (&resume_info, 1); |
291 | } | |
292 | ||
293 | non_stop = 1; | |
294 | mywait (ptid, &status, 0, 0); | |
295 | #else | |
296 | non_stop = 1; | |
297 | target_stop (ptid); | |
298 | ||
299 | memset (&status, 0, sizeof (status)); | |
300 | target_wait (ptid, &status, 0); | |
301 | #endif | |
302 | non_stop = was_non_stop; | |
303 | } | |
304 | ||
305 | if (fd >= 0) | |
306 | { | |
307 | #ifdef GDBSERVER | |
308 | if (read_inferior_memory (ipa_sym_addrs.addr_cmd_buf, | |
309 | (unsigned char *) cmd, IPA_CMD_BUF_SIZE)) | |
310 | #else | |
311 | if (target_read_memory (ipa_sym_addrs.addr_cmd_buf, (gdb_byte *) cmd, | |
312 | IPA_CMD_BUF_SIZE)) | |
313 | #endif | |
314 | { | |
87399aa1 | 315 | warning (_("Error reading command response")); |
2fa291ac YQ |
316 | return -1; |
317 | } | |
318 | } | |
319 | ||
320 | return 0; | |
321 | } | |
8ffcbaaf YQ |
322 | |
323 | /* Each bit of it stands for a capability of agent. */ | |
324 | static unsigned int agent_capability = 0; | |
325 | ||
326 | /* Return true if agent has capability AGENT_CAP, otherwise return false. */ | |
327 | ||
328 | int | |
329 | agent_capability_check (enum agent_capa agent_capa) | |
330 | { | |
331 | if (agent_capability == 0) | |
332 | { | |
333 | #ifdef GDBSERVER | |
334 | if (read_inferior_memory (ipa_sym_addrs.addr_capability, | |
335 | (unsigned char *) &agent_capability, | |
336 | sizeof agent_capability)) | |
337 | #else | |
f5656ead | 338 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
8ffcbaaf YQ |
339 | gdb_byte buf[4]; |
340 | ||
341 | if (target_read_memory (ipa_sym_addrs.addr_capability, | |
342 | buf, sizeof buf) == 0) | |
343 | agent_capability = extract_unsigned_integer (buf, sizeof buf, | |
344 | byte_order); | |
345 | else | |
346 | #endif | |
87399aa1 | 347 | warning (_("Error reading capability of agent")); |
8ffcbaaf YQ |
348 | } |
349 | return agent_capability & agent_capa; | |
350 | } | |
351 | ||
352 | /* Invalidate the cache of agent capability, so we'll read it from inferior | |
353 | again. Call it when launches a new program or reconnect to remote stub. */ | |
354 | ||
355 | void | |
356 | agent_capability_invalidate (void) | |
357 | { | |
358 | agent_capability = 0; | |
359 | } |