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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 | 27 | #endif |
2fa291ac YQ |
28 | #include <unistd.h> |
29 | #include "agent.h" | |
614c279d | 30 | #include "filestuff.h" |
2fa291ac YQ |
31 | |
32 | int debug_agent = 0; | |
33 | ||
34abf635 GB |
34 | /* A stdarg wrapper for debug_vprintf. */ |
35 | ||
36 | static void ATTRIBUTE_PRINTF (1, 2) | |
37 | debug_agent_printf (const char *fmt, ...) | |
38 | { | |
39 | va_list ap; | |
40 | ||
41 | if (!debug_agent) | |
42 | return; | |
43 | va_start (ap, fmt); | |
44 | debug_vprintf (fmt, ap); | |
45 | va_end (ap); | |
46 | } | |
47 | ||
48 | #define DEBUG_AGENT debug_agent_printf | |
2fa291ac | 49 | |
d1feda86 YQ |
50 | /* Global flag to determine using agent or not. */ |
51 | int use_agent = 0; | |
52 | ||
2fa291ac YQ |
53 | /* Addresses of in-process agent's symbols both GDB and GDBserver cares |
54 | about. */ | |
55 | ||
56 | struct ipa_sym_addresses | |
57 | { | |
58 | CORE_ADDR addr_helper_thread_id; | |
59 | CORE_ADDR addr_cmd_buf; | |
8ffcbaaf | 60 | CORE_ADDR addr_capability; |
2fa291ac YQ |
61 | }; |
62 | ||
63 | /* Cache of the helper thread id. FIXME: this global should be made | |
64 | per-process. */ | |
65 | static unsigned int helper_thread_id = 0; | |
66 | ||
67 | static struct | |
68 | { | |
69 | const char *name; | |
70 | int offset; | |
71 | int required; | |
72 | } symbol_list[] = { | |
73 | IPA_SYM(helper_thread_id), | |
74 | IPA_SYM(cmd_buf), | |
8ffcbaaf | 75 | IPA_SYM(capability), |
2fa291ac YQ |
76 | }; |
77 | ||
78 | static struct ipa_sym_addresses ipa_sym_addrs; | |
79 | ||
58b4daa5 YQ |
80 | static int all_agent_symbols_looked_up = 0; |
81 | ||
82 | int | |
83 | agent_loaded_p (void) | |
84 | { | |
85 | return all_agent_symbols_looked_up; | |
86 | } | |
87 | ||
2fa291ac YQ |
88 | /* Look up all symbols needed by agent. Return 0 if all the symbols are |
89 | found, return non-zero otherwise. */ | |
90 | ||
91 | int | |
5808517f | 92 | agent_look_up_symbols (void *arg) |
2fa291ac YQ |
93 | { |
94 | int i; | |
95 | ||
58b4daa5 YQ |
96 | all_agent_symbols_looked_up = 0; |
97 | ||
2fa291ac YQ |
98 | for (i = 0; i < sizeof (symbol_list) / sizeof (symbol_list[0]); i++) |
99 | { | |
100 | CORE_ADDR *addrp = | |
101 | (CORE_ADDR *) ((char *) &ipa_sym_addrs + symbol_list[i].offset); | |
102 | #ifdef GDBSERVER | |
103 | ||
104 | if (look_up_one_symbol (symbol_list[i].name, addrp, 1) == 0) | |
105 | #else | |
3b7344d5 | 106 | struct bound_minimal_symbol sym = |
5808517f YQ |
107 | lookup_minimal_symbol (symbol_list[i].name, NULL, |
108 | (struct objfile *) arg); | |
2fa291ac | 109 | |
3b7344d5 | 110 | if (sym.minsym != NULL) |
77e371c0 | 111 | *addrp = BMSYMBOL_VALUE_ADDRESS (sym); |
2fa291ac YQ |
112 | else |
113 | #endif | |
114 | { | |
115 | DEBUG_AGENT ("symbol `%s' not found\n", symbol_list[i].name); | |
116 | return -1; | |
117 | } | |
118 | } | |
119 | ||
58b4daa5 | 120 | all_agent_symbols_looked_up = 1; |
2fa291ac YQ |
121 | return 0; |
122 | } | |
123 | ||
124 | static unsigned int | |
125 | agent_get_helper_thread_id (void) | |
126 | { | |
127 | if (helper_thread_id == 0) | |
128 | { | |
129 | #ifdef GDBSERVER | |
130 | if (read_inferior_memory (ipa_sym_addrs.addr_helper_thread_id, | |
131 | (unsigned char *) &helper_thread_id, | |
132 | sizeof helper_thread_id)) | |
133 | #else | |
f5656ead | 134 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
2fa291ac YQ |
135 | gdb_byte buf[4]; |
136 | ||
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, | |
140 | byte_order); | |
141 | else | |
142 | #endif | |
143 | { | |
87399aa1 | 144 | warning (_("Error reading helper thread's id in lib")); |
2fa291ac YQ |
145 | } |
146 | } | |
147 | ||
148 | return helper_thread_id; | |
149 | } | |
150 | ||
151 | #ifdef HAVE_SYS_UN_H | |
152 | #include <sys/socket.h> | |
153 | #include <sys/un.h> | |
154 | #define SOCK_DIR P_tmpdir | |
155 | ||
156 | #ifndef UNIX_PATH_MAX | |
157 | #define UNIX_PATH_MAX sizeof(((struct sockaddr_un *) NULL)->sun_path) | |
158 | #endif | |
159 | ||
160 | #endif | |
161 | ||
162 | /* Connects to synchronization socket. PID is the pid of inferior, which is | |
163 | used to set up the connection socket. */ | |
164 | ||
165 | static int | |
166 | gdb_connect_sync_socket (int pid) | |
167 | { | |
168 | #ifdef HAVE_SYS_UN_H | |
169 | struct sockaddr_un addr; | |
170 | int res, fd; | |
171 | char path[UNIX_PATH_MAX]; | |
172 | ||
173 | res = xsnprintf (path, UNIX_PATH_MAX, "%s/gdb_ust%d", P_tmpdir, pid); | |
174 | if (res >= UNIX_PATH_MAX) | |
175 | return -1; | |
176 | ||
614c279d | 177 | res = fd = gdb_socket_cloexec (PF_UNIX, SOCK_STREAM, 0); |
2fa291ac YQ |
178 | if (res == -1) |
179 | { | |
87399aa1 | 180 | warning (_("error opening sync socket: %s"), strerror (errno)); |
2fa291ac YQ |
181 | return -1; |
182 | } | |
183 | ||
184 | addr.sun_family = AF_UNIX; | |
185 | ||
186 | res = xsnprintf (addr.sun_path, UNIX_PATH_MAX, "%s", path); | |
187 | if (res >= UNIX_PATH_MAX) | |
188 | { | |
87399aa1 | 189 | warning (_("string overflow allocating socket name")); |
2fa291ac YQ |
190 | close (fd); |
191 | return -1; | |
192 | } | |
193 | ||
194 | res = connect (fd, (struct sockaddr *) &addr, sizeof (addr)); | |
195 | if (res == -1) | |
196 | { | |
87399aa1 YQ |
197 | warning (_("error connecting sync socket (%s): %s. " |
198 | "Make sure the directory exists and that it is writable."), | |
199 | path, strerror (errno)); | |
2fa291ac YQ |
200 | close (fd); |
201 | return -1; | |
202 | } | |
203 | ||
204 | return fd; | |
205 | #else | |
206 | return -1; | |
207 | #endif | |
208 | } | |
209 | ||
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. */ | |
215 | ||
216 | int | |
42476b70 | 217 | agent_run_command (int pid, const char *cmd, int len) |
2fa291ac YQ |
218 | { |
219 | int fd; | |
220 | int tid = agent_get_helper_thread_id (); | |
221 | ptid_t ptid = ptid_build (pid, tid, 0); | |
2fa291ac YQ |
222 | |
223 | #ifdef GDBSERVER | |
224 | int ret = write_inferior_memory (ipa_sym_addrs.addr_cmd_buf, | |
225 | (const unsigned char *) cmd, len); | |
226 | #else | |
fda0389f PA |
227 | int ret = target_write_memory (ipa_sym_addrs.addr_cmd_buf, |
228 | (gdb_byte *) cmd, len); | |
2fa291ac YQ |
229 | #endif |
230 | ||
231 | if (ret != 0) | |
232 | { | |
87399aa1 | 233 | warning (_("unable to write")); |
2fa291ac YQ |
234 | return -1; |
235 | } | |
236 | ||
237 | DEBUG_AGENT ("agent: resumed helper thread\n"); | |
238 | ||
239 | /* Resume helper thread. */ | |
240 | #ifdef GDBSERVER | |
241 | { | |
242 | struct thread_resume resume_info; | |
243 | ||
244 | resume_info.thread = ptid; | |
245 | resume_info.kind = resume_continue; | |
a493e3e2 | 246 | resume_info.sig = GDB_SIGNAL_0; |
2fa291ac YQ |
247 | (*the_target->resume) (&resume_info, 1); |
248 | } | |
249 | #else | |
a493e3e2 | 250 | target_resume (ptid, 0, GDB_SIGNAL_0); |
2fa291ac YQ |
251 | #endif |
252 | ||
253 | fd = gdb_connect_sync_socket (pid); | |
254 | if (fd >= 0) | |
255 | { | |
256 | char buf[1] = ""; | |
257 | int ret; | |
258 | ||
259 | DEBUG_AGENT ("agent: signalling helper thread\n"); | |
260 | ||
261 | do | |
262 | { | |
263 | ret = write (fd, buf, 1); | |
264 | } while (ret == -1 && errno == EINTR); | |
265 | ||
266 | DEBUG_AGENT ("agent: waiting for helper thread's response\n"); | |
267 | ||
268 | do | |
269 | { | |
270 | ret = read (fd, buf, 1); | |
271 | } while (ret == -1 && errno == EINTR); | |
272 | ||
273 | close (fd); | |
274 | ||
275 | DEBUG_AGENT ("agent: helper thread's response received\n"); | |
276 | } | |
277 | else | |
278 | return -1; | |
279 | ||
280 | /* Need to read response with the inferior stopped. */ | |
281 | if (!ptid_equal (ptid, null_ptid)) | |
282 | { | |
283 | struct target_waitstatus status; | |
284 | int was_non_stop = non_stop; | |
285 | /* Stop thread PTID. */ | |
286 | DEBUG_AGENT ("agent: stop helper thread\n"); | |
287 | #ifdef GDBSERVER | |
288 | { | |
289 | struct thread_resume resume_info; | |
290 | ||
291 | resume_info.thread = ptid; | |
292 | resume_info.kind = resume_stop; | |
a493e3e2 | 293 | resume_info.sig = GDB_SIGNAL_0; |
2fa291ac YQ |
294 | (*the_target->resume) (&resume_info, 1); |
295 | } | |
296 | ||
297 | non_stop = 1; | |
298 | mywait (ptid, &status, 0, 0); | |
299 | #else | |
300 | non_stop = 1; | |
301 | target_stop (ptid); | |
302 | ||
303 | memset (&status, 0, sizeof (status)); | |
304 | target_wait (ptid, &status, 0); | |
305 | #endif | |
306 | non_stop = was_non_stop; | |
307 | } | |
308 | ||
309 | if (fd >= 0) | |
310 | { | |
311 | #ifdef GDBSERVER | |
312 | if (read_inferior_memory (ipa_sym_addrs.addr_cmd_buf, | |
313 | (unsigned char *) cmd, IPA_CMD_BUF_SIZE)) | |
314 | #else | |
315 | if (target_read_memory (ipa_sym_addrs.addr_cmd_buf, (gdb_byte *) cmd, | |
316 | IPA_CMD_BUF_SIZE)) | |
317 | #endif | |
318 | { | |
87399aa1 | 319 | warning (_("Error reading command response")); |
2fa291ac YQ |
320 | return -1; |
321 | } | |
322 | } | |
323 | ||
324 | return 0; | |
325 | } | |
8ffcbaaf YQ |
326 | |
327 | /* Each bit of it stands for a capability of agent. */ | |
328 | static unsigned int agent_capability = 0; | |
329 | ||
330 | /* Return true if agent has capability AGENT_CAP, otherwise return false. */ | |
331 | ||
332 | int | |
333 | agent_capability_check (enum agent_capa agent_capa) | |
334 | { | |
335 | if (agent_capability == 0) | |
336 | { | |
337 | #ifdef GDBSERVER | |
338 | if (read_inferior_memory (ipa_sym_addrs.addr_capability, | |
339 | (unsigned char *) &agent_capability, | |
340 | sizeof agent_capability)) | |
341 | #else | |
f5656ead | 342 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
8ffcbaaf YQ |
343 | gdb_byte buf[4]; |
344 | ||
345 | if (target_read_memory (ipa_sym_addrs.addr_capability, | |
346 | buf, sizeof buf) == 0) | |
347 | agent_capability = extract_unsigned_integer (buf, sizeof buf, | |
348 | byte_order); | |
349 | else | |
350 | #endif | |
87399aa1 | 351 | warning (_("Error reading capability of agent")); |
8ffcbaaf YQ |
352 | } |
353 | return agent_capability & agent_capa; | |
354 | } | |
355 | ||
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. */ | |
358 | ||
359 | void | |
360 | agent_capability_invalidate (void) | |
361 | { | |
362 | agent_capability = 0; | |
363 | } |