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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" | |
25 | #include "inferior.h" /* for non_stop */ | |
26 | #endif | |
27 | ||
28 | #include <string.h> | |
29 | #include <unistd.h> | |
30 | #include "agent.h" | |
614c279d | 31 | #include "filestuff.h" |
2fa291ac YQ |
32 | |
33 | int debug_agent = 0; | |
34 | ||
35 | #ifdef GDBSERVER | |
36 | #define DEBUG_AGENT(fmt, args...) \ | |
37 | if (debug_agent) \ | |
38 | fprintf (stderr, fmt, ##args); | |
39 | #else | |
40 | #define DEBUG_AGENT(fmt, args...) \ | |
41 | if (debug_agent) \ | |
42 | fprintf_unfiltered (gdb_stdlog, fmt, ##args); | |
43 | #endif | |
44 | ||
d1feda86 YQ |
45 | /* Global flag to determine using agent or not. */ |
46 | int use_agent = 0; | |
47 | ||
2fa291ac YQ |
48 | /* Addresses of in-process agent's symbols both GDB and GDBserver cares |
49 | about. */ | |
50 | ||
51 | struct ipa_sym_addresses | |
52 | { | |
53 | CORE_ADDR addr_helper_thread_id; | |
54 | CORE_ADDR addr_cmd_buf; | |
8ffcbaaf | 55 | CORE_ADDR addr_capability; |
2fa291ac YQ |
56 | }; |
57 | ||
58 | /* Cache of the helper thread id. FIXME: this global should be made | |
59 | per-process. */ | |
60 | static unsigned int helper_thread_id = 0; | |
61 | ||
62 | static struct | |
63 | { | |
64 | const char *name; | |
65 | int offset; | |
66 | int required; | |
67 | } symbol_list[] = { | |
68 | IPA_SYM(helper_thread_id), | |
69 | IPA_SYM(cmd_buf), | |
8ffcbaaf | 70 | IPA_SYM(capability), |
2fa291ac YQ |
71 | }; |
72 | ||
73 | static struct ipa_sym_addresses ipa_sym_addrs; | |
74 | ||
58b4daa5 YQ |
75 | static int all_agent_symbols_looked_up = 0; |
76 | ||
77 | int | |
78 | agent_loaded_p (void) | |
79 | { | |
80 | return all_agent_symbols_looked_up; | |
81 | } | |
82 | ||
2fa291ac YQ |
83 | /* Look up all symbols needed by agent. Return 0 if all the symbols are |
84 | found, return non-zero otherwise. */ | |
85 | ||
86 | int | |
5808517f | 87 | agent_look_up_symbols (void *arg) |
2fa291ac YQ |
88 | { |
89 | int i; | |
90 | ||
58b4daa5 YQ |
91 | all_agent_symbols_looked_up = 0; |
92 | ||
2fa291ac YQ |
93 | for (i = 0; i < sizeof (symbol_list) / sizeof (symbol_list[0]); i++) |
94 | { | |
95 | CORE_ADDR *addrp = | |
96 | (CORE_ADDR *) ((char *) &ipa_sym_addrs + symbol_list[i].offset); | |
97 | #ifdef GDBSERVER | |
98 | ||
99 | if (look_up_one_symbol (symbol_list[i].name, addrp, 1) == 0) | |
100 | #else | |
5808517f YQ |
101 | struct minimal_symbol *sym = |
102 | lookup_minimal_symbol (symbol_list[i].name, NULL, | |
103 | (struct objfile *) arg); | |
2fa291ac YQ |
104 | |
105 | if (sym != NULL) | |
efd66ac6 | 106 | *addrp = MSYMBOL_VALUE_ADDRESS (sym); |
2fa291ac YQ |
107 | else |
108 | #endif | |
109 | { | |
110 | DEBUG_AGENT ("symbol `%s' not found\n", symbol_list[i].name); | |
111 | return -1; | |
112 | } | |
113 | } | |
114 | ||
58b4daa5 | 115 | all_agent_symbols_looked_up = 1; |
2fa291ac YQ |
116 | return 0; |
117 | } | |
118 | ||
119 | static unsigned int | |
120 | agent_get_helper_thread_id (void) | |
121 | { | |
122 | if (helper_thread_id == 0) | |
123 | { | |
124 | #ifdef GDBSERVER | |
125 | if (read_inferior_memory (ipa_sym_addrs.addr_helper_thread_id, | |
126 | (unsigned char *) &helper_thread_id, | |
127 | sizeof helper_thread_id)) | |
128 | #else | |
f5656ead | 129 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
2fa291ac YQ |
130 | gdb_byte buf[4]; |
131 | ||
132 | if (target_read_memory (ipa_sym_addrs.addr_helper_thread_id, | |
133 | buf, sizeof buf) == 0) | |
134 | helper_thread_id = extract_unsigned_integer (buf, sizeof buf, | |
135 | byte_order); | |
136 | else | |
137 | #endif | |
138 | { | |
87399aa1 | 139 | warning (_("Error reading helper thread's id in lib")); |
2fa291ac YQ |
140 | } |
141 | } | |
142 | ||
143 | return helper_thread_id; | |
144 | } | |
145 | ||
146 | #ifdef HAVE_SYS_UN_H | |
147 | #include <sys/socket.h> | |
148 | #include <sys/un.h> | |
149 | #define SOCK_DIR P_tmpdir | |
150 | ||
151 | #ifndef UNIX_PATH_MAX | |
152 | #define UNIX_PATH_MAX sizeof(((struct sockaddr_un *) NULL)->sun_path) | |
153 | #endif | |
154 | ||
155 | #endif | |
156 | ||
157 | /* Connects to synchronization socket. PID is the pid of inferior, which is | |
158 | used to set up the connection socket. */ | |
159 | ||
160 | static int | |
161 | gdb_connect_sync_socket (int pid) | |
162 | { | |
163 | #ifdef HAVE_SYS_UN_H | |
164 | struct sockaddr_un addr; | |
165 | int res, fd; | |
166 | char path[UNIX_PATH_MAX]; | |
167 | ||
168 | res = xsnprintf (path, UNIX_PATH_MAX, "%s/gdb_ust%d", P_tmpdir, pid); | |
169 | if (res >= UNIX_PATH_MAX) | |
170 | return -1; | |
171 | ||
614c279d | 172 | res = fd = gdb_socket_cloexec (PF_UNIX, SOCK_STREAM, 0); |
2fa291ac YQ |
173 | if (res == -1) |
174 | { | |
87399aa1 | 175 | warning (_("error opening sync socket: %s"), strerror (errno)); |
2fa291ac YQ |
176 | return -1; |
177 | } | |
178 | ||
179 | addr.sun_family = AF_UNIX; | |
180 | ||
181 | res = xsnprintf (addr.sun_path, UNIX_PATH_MAX, "%s", path); | |
182 | if (res >= UNIX_PATH_MAX) | |
183 | { | |
87399aa1 | 184 | warning (_("string overflow allocating socket name")); |
2fa291ac YQ |
185 | close (fd); |
186 | return -1; | |
187 | } | |
188 | ||
189 | res = connect (fd, (struct sockaddr *) &addr, sizeof (addr)); | |
190 | if (res == -1) | |
191 | { | |
87399aa1 YQ |
192 | warning (_("error connecting sync socket (%s): %s. " |
193 | "Make sure the directory exists and that it is writable."), | |
194 | path, strerror (errno)); | |
2fa291ac YQ |
195 | close (fd); |
196 | return -1; | |
197 | } | |
198 | ||
199 | return fd; | |
200 | #else | |
201 | return -1; | |
202 | #endif | |
203 | } | |
204 | ||
205 | /* Execute an agent command in the inferior. PID is the value of pid of the | |
206 | inferior. CMD is the buffer for command. GDB or GDBserver will store the | |
207 | command into it and fetch the return result from CMD. The interaction | |
208 | between GDB/GDBserver and the agent is synchronized by a synchronization | |
209 | socket. Return zero if success, otherwise return non-zero. */ | |
210 | ||
211 | int | |
42476b70 | 212 | agent_run_command (int pid, const char *cmd, int len) |
2fa291ac YQ |
213 | { |
214 | int fd; | |
215 | int tid = agent_get_helper_thread_id (); | |
216 | ptid_t ptid = ptid_build (pid, tid, 0); | |
2fa291ac YQ |
217 | |
218 | #ifdef GDBSERVER | |
219 | int ret = write_inferior_memory (ipa_sym_addrs.addr_cmd_buf, | |
220 | (const unsigned char *) cmd, len); | |
221 | #else | |
fda0389f PA |
222 | int ret = target_write_memory (ipa_sym_addrs.addr_cmd_buf, |
223 | (gdb_byte *) cmd, len); | |
2fa291ac YQ |
224 | #endif |
225 | ||
226 | if (ret != 0) | |
227 | { | |
87399aa1 | 228 | warning (_("unable to write")); |
2fa291ac YQ |
229 | return -1; |
230 | } | |
231 | ||
232 | DEBUG_AGENT ("agent: resumed helper thread\n"); | |
233 | ||
234 | /* Resume helper thread. */ | |
235 | #ifdef GDBSERVER | |
236 | { | |
237 | struct thread_resume resume_info; | |
238 | ||
239 | resume_info.thread = ptid; | |
240 | resume_info.kind = resume_continue; | |
a493e3e2 | 241 | resume_info.sig = GDB_SIGNAL_0; |
2fa291ac YQ |
242 | (*the_target->resume) (&resume_info, 1); |
243 | } | |
244 | #else | |
a493e3e2 | 245 | target_resume (ptid, 0, GDB_SIGNAL_0); |
2fa291ac YQ |
246 | #endif |
247 | ||
248 | fd = gdb_connect_sync_socket (pid); | |
249 | if (fd >= 0) | |
250 | { | |
251 | char buf[1] = ""; | |
252 | int ret; | |
253 | ||
254 | DEBUG_AGENT ("agent: signalling helper thread\n"); | |
255 | ||
256 | do | |
257 | { | |
258 | ret = write (fd, buf, 1); | |
259 | } while (ret == -1 && errno == EINTR); | |
260 | ||
261 | DEBUG_AGENT ("agent: waiting for helper thread's response\n"); | |
262 | ||
263 | do | |
264 | { | |
265 | ret = read (fd, buf, 1); | |
266 | } while (ret == -1 && errno == EINTR); | |
267 | ||
268 | close (fd); | |
269 | ||
270 | DEBUG_AGENT ("agent: helper thread's response received\n"); | |
271 | } | |
272 | else | |
273 | return -1; | |
274 | ||
275 | /* Need to read response with the inferior stopped. */ | |
276 | if (!ptid_equal (ptid, null_ptid)) | |
277 | { | |
278 | struct target_waitstatus status; | |
279 | int was_non_stop = non_stop; | |
280 | /* Stop thread PTID. */ | |
281 | DEBUG_AGENT ("agent: stop helper thread\n"); | |
282 | #ifdef GDBSERVER | |
283 | { | |
284 | struct thread_resume resume_info; | |
285 | ||
286 | resume_info.thread = ptid; | |
287 | resume_info.kind = resume_stop; | |
a493e3e2 | 288 | resume_info.sig = GDB_SIGNAL_0; |
2fa291ac YQ |
289 | (*the_target->resume) (&resume_info, 1); |
290 | } | |
291 | ||
292 | non_stop = 1; | |
293 | mywait (ptid, &status, 0, 0); | |
294 | #else | |
295 | non_stop = 1; | |
296 | target_stop (ptid); | |
297 | ||
298 | memset (&status, 0, sizeof (status)); | |
299 | target_wait (ptid, &status, 0); | |
300 | #endif | |
301 | non_stop = was_non_stop; | |
302 | } | |
303 | ||
304 | if (fd >= 0) | |
305 | { | |
306 | #ifdef GDBSERVER | |
307 | if (read_inferior_memory (ipa_sym_addrs.addr_cmd_buf, | |
308 | (unsigned char *) cmd, IPA_CMD_BUF_SIZE)) | |
309 | #else | |
310 | if (target_read_memory (ipa_sym_addrs.addr_cmd_buf, (gdb_byte *) cmd, | |
311 | IPA_CMD_BUF_SIZE)) | |
312 | #endif | |
313 | { | |
87399aa1 | 314 | warning (_("Error reading command response")); |
2fa291ac YQ |
315 | return -1; |
316 | } | |
317 | } | |
318 | ||
319 | return 0; | |
320 | } | |
8ffcbaaf YQ |
321 | |
322 | /* Each bit of it stands for a capability of agent. */ | |
323 | static unsigned int agent_capability = 0; | |
324 | ||
325 | /* Return true if agent has capability AGENT_CAP, otherwise return false. */ | |
326 | ||
327 | int | |
328 | agent_capability_check (enum agent_capa agent_capa) | |
329 | { | |
330 | if (agent_capability == 0) | |
331 | { | |
332 | #ifdef GDBSERVER | |
333 | if (read_inferior_memory (ipa_sym_addrs.addr_capability, | |
334 | (unsigned char *) &agent_capability, | |
335 | sizeof agent_capability)) | |
336 | #else | |
f5656ead | 337 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
8ffcbaaf YQ |
338 | gdb_byte buf[4]; |
339 | ||
340 | if (target_read_memory (ipa_sym_addrs.addr_capability, | |
341 | buf, sizeof buf) == 0) | |
342 | agent_capability = extract_unsigned_integer (buf, sizeof buf, | |
343 | byte_order); | |
344 | else | |
345 | #endif | |
87399aa1 | 346 | warning (_("Error reading capability of agent")); |
8ffcbaaf YQ |
347 | } |
348 | return agent_capability & agent_capa; | |
349 | } | |
350 | ||
351 | /* Invalidate the cache of agent capability, so we'll read it from inferior | |
352 | again. Call it when launches a new program or reconnect to remote stub. */ | |
353 | ||
354 | void | |
355 | agent_capability_invalidate (void) | |
356 | { | |
357 | agent_capability = 0; | |
358 | } |