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2fa291ac YQ |
1 | /* Shared utility routines for GDB to interact with agent. |
2 | ||
3 | Copyright (C) 2009-2012 Free Software Foundation, Inc. | |
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" | |
31 | ||
32 | int debug_agent = 0; | |
33 | ||
34 | #ifdef GDBSERVER | |
35 | #define DEBUG_AGENT(fmt, args...) \ | |
36 | if (debug_agent) \ | |
37 | fprintf (stderr, fmt, ##args); | |
38 | #else | |
39 | #define DEBUG_AGENT(fmt, args...) \ | |
40 | if (debug_agent) \ | |
41 | fprintf_unfiltered (gdb_stdlog, fmt, ##args); | |
42 | #endif | |
43 | ||
d1feda86 YQ |
44 | /* Global flag to determine using agent or not. */ |
45 | int use_agent = 0; | |
46 | ||
2fa291ac YQ |
47 | /* Addresses of in-process agent's symbols both GDB and GDBserver cares |
48 | about. */ | |
49 | ||
50 | struct ipa_sym_addresses | |
51 | { | |
52 | CORE_ADDR addr_helper_thread_id; | |
53 | CORE_ADDR addr_cmd_buf; | |
8ffcbaaf | 54 | CORE_ADDR addr_capability; |
2fa291ac YQ |
55 | }; |
56 | ||
57 | /* Cache of the helper thread id. FIXME: this global should be made | |
58 | per-process. */ | |
59 | static unsigned int helper_thread_id = 0; | |
60 | ||
61 | static struct | |
62 | { | |
63 | const char *name; | |
64 | int offset; | |
65 | int required; | |
66 | } symbol_list[] = { | |
67 | IPA_SYM(helper_thread_id), | |
68 | IPA_SYM(cmd_buf), | |
8ffcbaaf | 69 | IPA_SYM(capability), |
2fa291ac YQ |
70 | }; |
71 | ||
72 | static struct ipa_sym_addresses ipa_sym_addrs; | |
73 | ||
58b4daa5 YQ |
74 | static int all_agent_symbols_looked_up = 0; |
75 | ||
76 | int | |
77 | agent_loaded_p (void) | |
78 | { | |
79 | return all_agent_symbols_looked_up; | |
80 | } | |
81 | ||
2fa291ac YQ |
82 | /* Look up all symbols needed by agent. Return 0 if all the symbols are |
83 | found, return non-zero otherwise. */ | |
84 | ||
85 | int | |
5808517f | 86 | agent_look_up_symbols (void *arg) |
2fa291ac YQ |
87 | { |
88 | int i; | |
89 | ||
58b4daa5 YQ |
90 | all_agent_symbols_looked_up = 0; |
91 | ||
2fa291ac YQ |
92 | for (i = 0; i < sizeof (symbol_list) / sizeof (symbol_list[0]); i++) |
93 | { | |
94 | CORE_ADDR *addrp = | |
95 | (CORE_ADDR *) ((char *) &ipa_sym_addrs + symbol_list[i].offset); | |
96 | #ifdef GDBSERVER | |
97 | ||
98 | if (look_up_one_symbol (symbol_list[i].name, addrp, 1) == 0) | |
99 | #else | |
5808517f YQ |
100 | struct minimal_symbol *sym = |
101 | lookup_minimal_symbol (symbol_list[i].name, NULL, | |
102 | (struct objfile *) arg); | |
2fa291ac YQ |
103 | |
104 | if (sym != NULL) | |
105 | *addrp = SYMBOL_VALUE_ADDRESS (sym); | |
106 | else | |
107 | #endif | |
108 | { | |
109 | DEBUG_AGENT ("symbol `%s' not found\n", symbol_list[i].name); | |
110 | return -1; | |
111 | } | |
112 | } | |
113 | ||
58b4daa5 | 114 | all_agent_symbols_looked_up = 1; |
2fa291ac YQ |
115 | return 0; |
116 | } | |
117 | ||
118 | static unsigned int | |
119 | agent_get_helper_thread_id (void) | |
120 | { | |
121 | if (helper_thread_id == 0) | |
122 | { | |
123 | #ifdef GDBSERVER | |
124 | if (read_inferior_memory (ipa_sym_addrs.addr_helper_thread_id, | |
125 | (unsigned char *) &helper_thread_id, | |
126 | sizeof helper_thread_id)) | |
127 | #else | |
f5656ead | 128 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
2fa291ac YQ |
129 | gdb_byte buf[4]; |
130 | ||
131 | if (target_read_memory (ipa_sym_addrs.addr_helper_thread_id, | |
132 | buf, sizeof buf) == 0) | |
133 | helper_thread_id = extract_unsigned_integer (buf, sizeof buf, | |
134 | byte_order); | |
135 | else | |
136 | #endif | |
137 | { | |
87399aa1 | 138 | warning (_("Error reading helper thread's id in lib")); |
2fa291ac YQ |
139 | } |
140 | } | |
141 | ||
142 | return helper_thread_id; | |
143 | } | |
144 | ||
145 | #ifdef HAVE_SYS_UN_H | |
146 | #include <sys/socket.h> | |
147 | #include <sys/un.h> | |
148 | #define SOCK_DIR P_tmpdir | |
149 | ||
150 | #ifndef UNIX_PATH_MAX | |
151 | #define UNIX_PATH_MAX sizeof(((struct sockaddr_un *) NULL)->sun_path) | |
152 | #endif | |
153 | ||
154 | #endif | |
155 | ||
156 | /* Connects to synchronization socket. PID is the pid of inferior, which is | |
157 | used to set up the connection socket. */ | |
158 | ||
159 | static int | |
160 | gdb_connect_sync_socket (int pid) | |
161 | { | |
162 | #ifdef HAVE_SYS_UN_H | |
163 | struct sockaddr_un addr; | |
164 | int res, fd; | |
165 | char path[UNIX_PATH_MAX]; | |
166 | ||
167 | res = xsnprintf (path, UNIX_PATH_MAX, "%s/gdb_ust%d", P_tmpdir, pid); | |
168 | if (res >= UNIX_PATH_MAX) | |
169 | return -1; | |
170 | ||
171 | res = fd = socket (PF_UNIX, SOCK_STREAM, 0); | |
172 | if (res == -1) | |
173 | { | |
87399aa1 | 174 | warning (_("error opening sync socket: %s"), strerror (errno)); |
2fa291ac YQ |
175 | return -1; |
176 | } | |
177 | ||
178 | addr.sun_family = AF_UNIX; | |
179 | ||
180 | res = xsnprintf (addr.sun_path, UNIX_PATH_MAX, "%s", path); | |
181 | if (res >= UNIX_PATH_MAX) | |
182 | { | |
87399aa1 | 183 | warning (_("string overflow allocating socket name")); |
2fa291ac YQ |
184 | close (fd); |
185 | return -1; | |
186 | } | |
187 | ||
188 | res = connect (fd, (struct sockaddr *) &addr, sizeof (addr)); | |
189 | if (res == -1) | |
190 | { | |
87399aa1 YQ |
191 | warning (_("error connecting sync socket (%s): %s. " |
192 | "Make sure the directory exists and that it is writable."), | |
193 | path, strerror (errno)); | |
2fa291ac YQ |
194 | close (fd); |
195 | return -1; | |
196 | } | |
197 | ||
198 | return fd; | |
199 | #else | |
200 | return -1; | |
201 | #endif | |
202 | } | |
203 | ||
204 | /* Execute an agent command in the inferior. PID is the value of pid of the | |
205 | inferior. CMD is the buffer for command. GDB or GDBserver will store the | |
206 | command into it and fetch the return result from CMD. The interaction | |
207 | between GDB/GDBserver and the agent is synchronized by a synchronization | |
208 | socket. Return zero if success, otherwise return non-zero. */ | |
209 | ||
210 | int | |
42476b70 | 211 | agent_run_command (int pid, const char *cmd, int len) |
2fa291ac YQ |
212 | { |
213 | int fd; | |
214 | int tid = agent_get_helper_thread_id (); | |
215 | ptid_t ptid = ptid_build (pid, tid, 0); | |
2fa291ac YQ |
216 | |
217 | #ifdef GDBSERVER | |
218 | int ret = write_inferior_memory (ipa_sym_addrs.addr_cmd_buf, | |
219 | (const unsigned char *) cmd, len); | |
220 | #else | |
221 | int ret = target_write_memory (ipa_sym_addrs.addr_cmd_buf, cmd, len); | |
222 | #endif | |
223 | ||
224 | if (ret != 0) | |
225 | { | |
87399aa1 | 226 | warning (_("unable to write")); |
2fa291ac YQ |
227 | return -1; |
228 | } | |
229 | ||
230 | DEBUG_AGENT ("agent: resumed helper thread\n"); | |
231 | ||
232 | /* Resume helper thread. */ | |
233 | #ifdef GDBSERVER | |
234 | { | |
235 | struct thread_resume resume_info; | |
236 | ||
237 | resume_info.thread = ptid; | |
238 | resume_info.kind = resume_continue; | |
a493e3e2 | 239 | resume_info.sig = GDB_SIGNAL_0; |
2fa291ac YQ |
240 | (*the_target->resume) (&resume_info, 1); |
241 | } | |
242 | #else | |
a493e3e2 | 243 | target_resume (ptid, 0, GDB_SIGNAL_0); |
2fa291ac YQ |
244 | #endif |
245 | ||
246 | fd = gdb_connect_sync_socket (pid); | |
247 | if (fd >= 0) | |
248 | { | |
249 | char buf[1] = ""; | |
250 | int ret; | |
251 | ||
252 | DEBUG_AGENT ("agent: signalling helper thread\n"); | |
253 | ||
254 | do | |
255 | { | |
256 | ret = write (fd, buf, 1); | |
257 | } while (ret == -1 && errno == EINTR); | |
258 | ||
259 | DEBUG_AGENT ("agent: waiting for helper thread's response\n"); | |
260 | ||
261 | do | |
262 | { | |
263 | ret = read (fd, buf, 1); | |
264 | } while (ret == -1 && errno == EINTR); | |
265 | ||
266 | close (fd); | |
267 | ||
268 | DEBUG_AGENT ("agent: helper thread's response received\n"); | |
269 | } | |
270 | else | |
271 | return -1; | |
272 | ||
273 | /* Need to read response with the inferior stopped. */ | |
274 | if (!ptid_equal (ptid, null_ptid)) | |
275 | { | |
276 | struct target_waitstatus status; | |
277 | int was_non_stop = non_stop; | |
278 | /* Stop thread PTID. */ | |
279 | DEBUG_AGENT ("agent: stop helper thread\n"); | |
280 | #ifdef GDBSERVER | |
281 | { | |
282 | struct thread_resume resume_info; | |
283 | ||
284 | resume_info.thread = ptid; | |
285 | resume_info.kind = resume_stop; | |
a493e3e2 | 286 | resume_info.sig = GDB_SIGNAL_0; |
2fa291ac YQ |
287 | (*the_target->resume) (&resume_info, 1); |
288 | } | |
289 | ||
290 | non_stop = 1; | |
291 | mywait (ptid, &status, 0, 0); | |
292 | #else | |
293 | non_stop = 1; | |
294 | target_stop (ptid); | |
295 | ||
296 | memset (&status, 0, sizeof (status)); | |
297 | target_wait (ptid, &status, 0); | |
298 | #endif | |
299 | non_stop = was_non_stop; | |
300 | } | |
301 | ||
302 | if (fd >= 0) | |
303 | { | |
304 | #ifdef GDBSERVER | |
305 | if (read_inferior_memory (ipa_sym_addrs.addr_cmd_buf, | |
306 | (unsigned char *) cmd, IPA_CMD_BUF_SIZE)) | |
307 | #else | |
308 | if (target_read_memory (ipa_sym_addrs.addr_cmd_buf, (gdb_byte *) cmd, | |
309 | IPA_CMD_BUF_SIZE)) | |
310 | #endif | |
311 | { | |
87399aa1 | 312 | warning (_("Error reading command response")); |
2fa291ac YQ |
313 | return -1; |
314 | } | |
315 | } | |
316 | ||
317 | return 0; | |
318 | } | |
8ffcbaaf YQ |
319 | |
320 | /* Each bit of it stands for a capability of agent. */ | |
321 | static unsigned int agent_capability = 0; | |
322 | ||
323 | /* Return true if agent has capability AGENT_CAP, otherwise return false. */ | |
324 | ||
325 | int | |
326 | agent_capability_check (enum agent_capa agent_capa) | |
327 | { | |
328 | if (agent_capability == 0) | |
329 | { | |
330 | #ifdef GDBSERVER | |
331 | if (read_inferior_memory (ipa_sym_addrs.addr_capability, | |
332 | (unsigned char *) &agent_capability, | |
333 | sizeof agent_capability)) | |
334 | #else | |
f5656ead | 335 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
8ffcbaaf YQ |
336 | gdb_byte buf[4]; |
337 | ||
338 | if (target_read_memory (ipa_sym_addrs.addr_capability, | |
339 | buf, sizeof buf) == 0) | |
340 | agent_capability = extract_unsigned_integer (buf, sizeof buf, | |
341 | byte_order); | |
342 | else | |
343 | #endif | |
87399aa1 | 344 | warning (_("Error reading capability of agent")); |
8ffcbaaf YQ |
345 | } |
346 | return agent_capability & agent_capa; | |
347 | } | |
348 | ||
349 | /* Invalidate the cache of agent capability, so we'll read it from inferior | |
350 | again. Call it when launches a new program or reconnect to remote stub. */ | |
351 | ||
352 | void | |
353 | agent_capability_invalidate (void) | |
354 | { | |
355 | agent_capability = 0; | |
356 | } |