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2fa291ac YQ |
1 | /* Shared utility routines for GDB to interact with agent. |
2 | ||
61baf725 | 3 | Copyright (C) 2009-2017 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 | ||
727605ca | 20 | #include "common-defs.h" |
721ec300 | 21 | #include "target/target.h" |
bd9269f7 | 22 | #include "common/symbol.h" |
2fa291ac YQ |
23 | #include <unistd.h> |
24 | #include "agent.h" | |
614c279d | 25 | #include "filestuff.h" |
2fa291ac YQ |
26 | |
27 | int debug_agent = 0; | |
28 | ||
34abf635 GB |
29 | /* A stdarg wrapper for debug_vprintf. */ |
30 | ||
31 | static void ATTRIBUTE_PRINTF (1, 2) | |
32 | debug_agent_printf (const char *fmt, ...) | |
33 | { | |
34 | va_list ap; | |
35 | ||
36 | if (!debug_agent) | |
37 | return; | |
38 | va_start (ap, fmt); | |
39 | debug_vprintf (fmt, ap); | |
40 | va_end (ap); | |
41 | } | |
42 | ||
43 | #define DEBUG_AGENT debug_agent_printf | |
2fa291ac | 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. */ | |
721ec300 | 60 | static uint32_t helper_thread_id = 0; |
2fa291ac YQ |
61 | |
62 | static struct | |
63 | { | |
64 | const char *name; | |
65 | int offset; | |
2fa291ac YQ |
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); | |
9a3c8263 | 96 | struct objfile *objfile = (struct objfile *) arg; |
2fa291ac | 97 | |
bd9269f7 | 98 | if (find_minimal_symbol_address (symbol_list[i].name, addrp, |
9a3c8263 | 99 | objfile) != 0) |
2fa291ac YQ |
100 | { |
101 | DEBUG_AGENT ("symbol `%s' not found\n", symbol_list[i].name); | |
102 | return -1; | |
103 | } | |
104 | } | |
105 | ||
58b4daa5 | 106 | all_agent_symbols_looked_up = 1; |
2fa291ac YQ |
107 | return 0; |
108 | } | |
109 | ||
110 | static unsigned int | |
111 | agent_get_helper_thread_id (void) | |
112 | { | |
113 | if (helper_thread_id == 0) | |
114 | { | |
721ec300 GB |
115 | if (target_read_uint32 (ipa_sym_addrs.addr_helper_thread_id, |
116 | &helper_thread_id)) | |
117 | warning (_("Error reading helper thread's id in lib")); | |
2fa291ac YQ |
118 | } |
119 | ||
120 | return helper_thread_id; | |
121 | } | |
122 | ||
123 | #ifdef HAVE_SYS_UN_H | |
124 | #include <sys/socket.h> | |
125 | #include <sys/un.h> | |
126 | #define SOCK_DIR P_tmpdir | |
127 | ||
128 | #ifndef UNIX_PATH_MAX | |
129 | #define UNIX_PATH_MAX sizeof(((struct sockaddr_un *) NULL)->sun_path) | |
130 | #endif | |
131 | ||
132 | #endif | |
133 | ||
134 | /* Connects to synchronization socket. PID is the pid of inferior, which is | |
135 | used to set up the connection socket. */ | |
136 | ||
137 | static int | |
138 | gdb_connect_sync_socket (int pid) | |
139 | { | |
140 | #ifdef HAVE_SYS_UN_H | |
141 | struct sockaddr_un addr; | |
142 | int res, fd; | |
143 | char path[UNIX_PATH_MAX]; | |
144 | ||
145 | res = xsnprintf (path, UNIX_PATH_MAX, "%s/gdb_ust%d", P_tmpdir, pid); | |
146 | if (res >= UNIX_PATH_MAX) | |
147 | return -1; | |
148 | ||
614c279d | 149 | res = fd = gdb_socket_cloexec (PF_UNIX, SOCK_STREAM, 0); |
2fa291ac YQ |
150 | if (res == -1) |
151 | { | |
87399aa1 | 152 | warning (_("error opening sync socket: %s"), strerror (errno)); |
2fa291ac YQ |
153 | return -1; |
154 | } | |
155 | ||
156 | addr.sun_family = AF_UNIX; | |
157 | ||
158 | res = xsnprintf (addr.sun_path, UNIX_PATH_MAX, "%s", path); | |
159 | if (res >= UNIX_PATH_MAX) | |
160 | { | |
87399aa1 | 161 | warning (_("string overflow allocating socket name")); |
2fa291ac YQ |
162 | close (fd); |
163 | return -1; | |
164 | } | |
165 | ||
166 | res = connect (fd, (struct sockaddr *) &addr, sizeof (addr)); | |
167 | if (res == -1) | |
168 | { | |
87399aa1 YQ |
169 | warning (_("error connecting sync socket (%s): %s. " |
170 | "Make sure the directory exists and that it is writable."), | |
171 | path, strerror (errno)); | |
2fa291ac YQ |
172 | close (fd); |
173 | return -1; | |
174 | } | |
175 | ||
176 | return fd; | |
177 | #else | |
178 | return -1; | |
179 | #endif | |
180 | } | |
181 | ||
182 | /* Execute an agent command in the inferior. PID is the value of pid of the | |
183 | inferior. CMD is the buffer for command. GDB or GDBserver will store the | |
184 | command into it and fetch the return result from CMD. The interaction | |
185 | between GDB/GDBserver and the agent is synchronized by a synchronization | |
186 | socket. Return zero if success, otherwise return non-zero. */ | |
187 | ||
188 | int | |
42476b70 | 189 | agent_run_command (int pid, const char *cmd, int len) |
2fa291ac YQ |
190 | { |
191 | int fd; | |
192 | int tid = agent_get_helper_thread_id (); | |
193 | ptid_t ptid = ptid_build (pid, tid, 0); | |
2fa291ac | 194 | |
fda0389f PA |
195 | int ret = target_write_memory (ipa_sym_addrs.addr_cmd_buf, |
196 | (gdb_byte *) cmd, len); | |
2fa291ac YQ |
197 | |
198 | if (ret != 0) | |
199 | { | |
87399aa1 | 200 | warning (_("unable to write")); |
2fa291ac YQ |
201 | return -1; |
202 | } | |
203 | ||
204 | DEBUG_AGENT ("agent: resumed helper thread\n"); | |
205 | ||
206 | /* Resume helper thread. */ | |
03f4463b | 207 | target_continue_no_signal (ptid); |
2fa291ac YQ |
208 | |
209 | fd = gdb_connect_sync_socket (pid); | |
210 | if (fd >= 0) | |
211 | { | |
212 | char buf[1] = ""; | |
213 | int ret; | |
214 | ||
215 | DEBUG_AGENT ("agent: signalling helper thread\n"); | |
216 | ||
217 | do | |
218 | { | |
219 | ret = write (fd, buf, 1); | |
220 | } while (ret == -1 && errno == EINTR); | |
221 | ||
222 | DEBUG_AGENT ("agent: waiting for helper thread's response\n"); | |
223 | ||
224 | do | |
225 | { | |
226 | ret = read (fd, buf, 1); | |
227 | } while (ret == -1 && errno == EINTR); | |
228 | ||
229 | close (fd); | |
230 | ||
231 | DEBUG_AGENT ("agent: helper thread's response received\n"); | |
232 | } | |
233 | else | |
234 | return -1; | |
235 | ||
236 | /* Need to read response with the inferior stopped. */ | |
237 | if (!ptid_equal (ptid, null_ptid)) | |
238 | { | |
2fa291ac YQ |
239 | /* Stop thread PTID. */ |
240 | DEBUG_AGENT ("agent: stop helper thread\n"); | |
03f4463b | 241 | target_stop_and_wait (ptid); |
2fa291ac YQ |
242 | } |
243 | ||
244 | if (fd >= 0) | |
245 | { | |
2fa291ac YQ |
246 | if (target_read_memory (ipa_sym_addrs.addr_cmd_buf, (gdb_byte *) cmd, |
247 | IPA_CMD_BUF_SIZE)) | |
2fa291ac | 248 | { |
87399aa1 | 249 | warning (_("Error reading command response")); |
2fa291ac YQ |
250 | return -1; |
251 | } | |
252 | } | |
253 | ||
254 | return 0; | |
255 | } | |
8ffcbaaf YQ |
256 | |
257 | /* Each bit of it stands for a capability of agent. */ | |
721ec300 | 258 | static uint32_t agent_capability = 0; |
8ffcbaaf YQ |
259 | |
260 | /* Return true if agent has capability AGENT_CAP, otherwise return false. */ | |
261 | ||
262 | int | |
263 | agent_capability_check (enum agent_capa agent_capa) | |
264 | { | |
265 | if (agent_capability == 0) | |
266 | { | |
721ec300 GB |
267 | if (target_read_uint32 (ipa_sym_addrs.addr_capability, |
268 | &agent_capability)) | |
87399aa1 | 269 | warning (_("Error reading capability of agent")); |
8ffcbaaf YQ |
270 | } |
271 | return agent_capability & agent_capa; | |
272 | } | |
273 | ||
274 | /* Invalidate the cache of agent capability, so we'll read it from inferior | |
275 | again. Call it when launches a new program or reconnect to remote stub. */ | |
276 | ||
277 | void | |
278 | agent_capability_invalidate (void) | |
279 | { | |
280 | agent_capability = 0; | |
281 | } |