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ce3a066d | 1 | /* Target operations for the remote server for GDB. |
42a4f53d | 2 | Copyright (C) 2002-2019 Free Software Foundation, Inc. |
ce3a066d DJ |
3 | |
4 | Contributed by MontaVista Software. | |
5 | ||
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
ce3a066d DJ |
11 | (at your option) any later version. |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
ce3a066d DJ |
20 | |
21 | #include "server.h" | |
c144c7a0 | 22 | #include "tracepoint.h" |
d59b55f0 | 23 | #include "gdbsupport/byte-vector.h" |
ce3a066d DJ |
24 | |
25 | struct target_ops *the_target; | |
26 | ||
f0db101d | 27 | int |
f557a88a | 28 | set_desired_thread () |
0d62e5e8 | 29 | { |
c12a5089 SC |
30 | client_state &cs = get_client_state (); |
31 | thread_info *found = find_thread_ptid (cs.general_thread); | |
0d62e5e8 | 32 | |
f0db101d PA |
33 | current_thread = found; |
34 | return (current_thread != NULL); | |
0d62e5e8 DJ |
35 | } |
36 | ||
a67a9fae PA |
37 | /* The thread that was current before prepare_to_access_memory was |
38 | called. done_accessing_memory uses this to restore the previous | |
39 | selected thread. */ | |
40 | static ptid_t prev_general_thread; | |
41 | ||
42 | /* See target.h. */ | |
43 | ||
44 | int | |
45 | prepare_to_access_memory (void) | |
46 | { | |
c12a5089 SC |
47 | client_state &cs = get_client_state (); |
48 | ||
bac608e7 SM |
49 | /* The first thread found. */ |
50 | struct thread_info *first = NULL; | |
51 | /* The first stopped thread found. */ | |
52 | struct thread_info *stopped = NULL; | |
53 | /* The current general thread, if found. */ | |
54 | struct thread_info *current = NULL; | |
a67a9fae | 55 | |
bac608e7 SM |
56 | /* Save the general thread value, since prepare_to_access_memory could change |
57 | it. */ | |
c12a5089 | 58 | prev_general_thread = cs.general_thread; |
a67a9fae PA |
59 | |
60 | if (the_target->prepare_to_access_memory != NULL) | |
61 | { | |
62 | int res; | |
63 | ||
64 | res = the_target->prepare_to_access_memory (); | |
65 | if (res != 0) | |
66 | return res; | |
67 | } | |
68 | ||
bac608e7 SM |
69 | for_each_thread (prev_general_thread.pid (), [&] (thread_info *thread) |
70 | { | |
71 | if (mythread_alive (thread->id)) | |
72 | { | |
73 | if (stopped == NULL && the_target->thread_stopped != NULL | |
74 | && thread_stopped (thread)) | |
75 | stopped = thread; | |
76 | ||
77 | if (first == NULL) | |
78 | first = thread; | |
79 | ||
80 | if (current == NULL && prev_general_thread == thread->id) | |
81 | current = thread; | |
82 | } | |
83 | }); | |
84 | ||
85 | /* The thread we end up choosing. */ | |
86 | struct thread_info *thread; | |
a67a9fae PA |
87 | |
88 | /* Prefer a stopped thread. If none is found, try the current | |
89 | thread. Otherwise, take the first thread in the process. If | |
90 | none is found, undo the effects of | |
91 | target->prepare_to_access_memory() and return error. */ | |
bac608e7 SM |
92 | if (stopped != NULL) |
93 | thread = stopped; | |
94 | else if (current != NULL) | |
95 | thread = current; | |
96 | else if (first != NULL) | |
97 | thread = first; | |
a67a9fae PA |
98 | else |
99 | { | |
100 | done_accessing_memory (); | |
101 | return 1; | |
102 | } | |
103 | ||
104 | current_thread = thread; | |
c12a5089 | 105 | cs.general_thread = ptid_of (thread); |
a67a9fae PA |
106 | |
107 | return 0; | |
108 | } | |
109 | ||
110 | /* See target.h. */ | |
111 | ||
112 | void | |
113 | done_accessing_memory (void) | |
114 | { | |
c12a5089 SC |
115 | client_state &cs = get_client_state (); |
116 | ||
a67a9fae PA |
117 | if (the_target->done_accessing_memory != NULL) |
118 | the_target->done_accessing_memory (); | |
119 | ||
120 | /* Restore the previous selected thread. */ | |
c12a5089 SC |
121 | cs.general_thread = prev_general_thread; |
122 | switch_to_thread (cs.general_thread); | |
a67a9fae PA |
123 | } |
124 | ||
c3e735a6 | 125 | int |
f450004a | 126 | read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
611cb4a5 | 127 | { |
c3e735a6 DJ |
128 | int res; |
129 | res = (*the_target->read_memory) (memaddr, myaddr, len); | |
611cb4a5 | 130 | check_mem_read (memaddr, myaddr, len); |
c3e735a6 | 131 | return res; |
611cb4a5 DJ |
132 | } |
133 | ||
721ec300 GB |
134 | /* See target/target.h. */ |
135 | ||
136 | int | |
137 | target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len) | |
138 | { | |
139 | return read_inferior_memory (memaddr, myaddr, len); | |
140 | } | |
141 | ||
142 | /* See target/target.h. */ | |
143 | ||
144 | int | |
145 | target_read_uint32 (CORE_ADDR memaddr, uint32_t *result) | |
146 | { | |
147 | return read_inferior_memory (memaddr, (gdb_byte *) result, sizeof (*result)); | |
148 | } | |
149 | ||
4196ab2a TT |
150 | /* See target/target.h. */ |
151 | ||
611cb4a5 | 152 | int |
4196ab2a TT |
153 | target_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, |
154 | ssize_t len) | |
0d62e5e8 | 155 | { |
c6778d00 TT |
156 | /* Make a copy of the data because check_mem_write may need to |
157 | update it. */ | |
d59b55f0 | 158 | gdb::byte_vector buffer (myaddr, myaddr + len); |
c6778d00 TT |
159 | check_mem_write (memaddr, buffer.data (), myaddr, len); |
160 | return (*the_target->write_memory) (memaddr, buffer.data (), len); | |
0d62e5e8 DJ |
161 | } |
162 | ||
95954743 PA |
163 | ptid_t |
164 | mywait (ptid_t ptid, struct target_waitstatus *ourstatus, int options, | |
bd99dc85 | 165 | int connected_wait) |
611cb4a5 | 166 | { |
95954743 | 167 | ptid_t ret; |
0d62e5e8 DJ |
168 | |
169 | if (connected_wait) | |
170 | server_waiting = 1; | |
171 | ||
f2b9e3df | 172 | ret = target_wait (ptid, ourstatus, options); |
bd99dc85 | 173 | |
4210d83e PA |
174 | /* We don't expose _LOADED events to gdbserver core. See the |
175 | `dlls_changed' global. */ | |
176 | if (ourstatus->kind == TARGET_WAITKIND_LOADED) | |
177 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
178 | ||
1a3d890b PA |
179 | /* If GDB is connected through TCP/serial, then GDBserver will most |
180 | probably be running on its own terminal/console, so it's nice to | |
181 | print there why is GDBserver exiting. If however, GDB is | |
182 | connected through stdio, then there's no need to spam the GDB | |
183 | console with this -- the user will already see the exit through | |
184 | regular GDB output, in that same terminal. */ | |
185 | if (!remote_connection_is_stdio ()) | |
186 | { | |
187 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) | |
188 | fprintf (stderr, | |
189 | "\nChild exited with status %d\n", ourstatus->value.integer); | |
190 | else if (ourstatus->kind == TARGET_WAITKIND_SIGNALLED) | |
191 | fprintf (stderr, "\nChild terminated with signal = 0x%x (%s)\n", | |
192 | gdb_signal_to_host (ourstatus->value.sig), | |
193 | gdb_signal_to_name (ourstatus->value.sig)); | |
194 | } | |
0d62e5e8 DJ |
195 | |
196 | if (connected_wait) | |
197 | server_waiting = 0; | |
198 | ||
199 | return ret; | |
611cb4a5 DJ |
200 | } |
201 | ||
f8c1d06b GB |
202 | /* See target/target.h. */ |
203 | ||
204 | void | |
03f4463b | 205 | target_stop_and_wait (ptid_t ptid) |
f8c1d06b GB |
206 | { |
207 | struct target_waitstatus status; | |
3e6ec53a | 208 | bool was_non_stop = non_stop; |
17e16485 | 209 | struct thread_resume resume_info; |
f8c1d06b | 210 | |
17e16485 YQ |
211 | resume_info.thread = ptid; |
212 | resume_info.kind = resume_stop; | |
213 | resume_info.sig = GDB_SIGNAL_0; | |
214 | (*the_target->resume) (&resume_info, 1); | |
f8c1d06b | 215 | |
3e6ec53a | 216 | non_stop = true; |
f8c1d06b GB |
217 | mywait (ptid, &status, 0, 0); |
218 | non_stop = was_non_stop; | |
219 | } | |
220 | ||
221 | /* See target/target.h. */ | |
222 | ||
f2b9e3df SDJ |
223 | ptid_t |
224 | target_wait (ptid_t ptid, struct target_waitstatus *status, int options) | |
225 | { | |
226 | return (*the_target->wait) (ptid, status, options); | |
227 | } | |
228 | ||
229 | /* See target/target.h. */ | |
230 | ||
bc1e6c81 SDJ |
231 | void |
232 | target_mourn_inferior (ptid_t ptid) | |
233 | { | |
e99b03dc | 234 | (*the_target->mourn) (find_process_pid (ptid.pid ())); |
bc1e6c81 SDJ |
235 | } |
236 | ||
237 | /* See target/target.h. */ | |
238 | ||
f8c1d06b | 239 | void |
03f4463b | 240 | target_continue_no_signal (ptid_t ptid) |
f8c1d06b GB |
241 | { |
242 | struct thread_resume resume_info; | |
243 | ||
244 | resume_info.thread = ptid; | |
245 | resume_info.kind = resume_continue; | |
246 | resume_info.sig = GDB_SIGNAL_0; | |
247 | (*the_target->resume) (&resume_info, 1); | |
248 | } | |
249 | ||
049a8570 SDJ |
250 | /* See target/target.h. */ |
251 | ||
252 | void | |
253 | target_continue (ptid_t ptid, enum gdb_signal signal) | |
254 | { | |
255 | struct thread_resume resume_info; | |
256 | ||
257 | resume_info.thread = ptid; | |
258 | resume_info.kind = resume_continue; | |
259 | resume_info.sig = gdb_signal_to_host (signal); | |
260 | (*the_target->resume) (&resume_info, 1); | |
261 | } | |
262 | ||
1fb77080 SDJ |
263 | /* See target/target.h. */ |
264 | ||
265 | int | |
266 | target_supports_multi_process (void) | |
267 | { | |
268 | return (the_target->supports_multi_process != NULL ? | |
269 | (*the_target->supports_multi_process) () : 0); | |
270 | } | |
271 | ||
bd99dc85 PA |
272 | int |
273 | start_non_stop (int nonstop) | |
274 | { | |
275 | if (the_target->start_non_stop == NULL) | |
276 | { | |
277 | if (nonstop) | |
278 | return -1; | |
279 | else | |
280 | return 0; | |
281 | } | |
282 | ||
283 | return (*the_target->start_non_stop) (nonstop); | |
284 | } | |
285 | ||
ce3a066d DJ |
286 | void |
287 | set_target_ops (struct target_ops *target) | |
288 | { | |
8d749320 | 289 | the_target = XNEW (struct target_ops); |
ce3a066d DJ |
290 | memcpy (the_target, target, sizeof (*the_target)); |
291 | } | |
95954743 PA |
292 | |
293 | /* Convert pid to printable format. */ | |
294 | ||
295 | const char * | |
296 | target_pid_to_str (ptid_t ptid) | |
297 | { | |
298 | static char buf[80]; | |
299 | ||
d7e15655 | 300 | if (ptid == minus_one_ptid) |
6cebaf6e | 301 | xsnprintf (buf, sizeof (buf), "<all threads>"); |
d7e15655 | 302 | else if (ptid == null_ptid) |
6cebaf6e | 303 | xsnprintf (buf, sizeof (buf), "<null thread>"); |
cc6bcb54 | 304 | else if (ptid.tid () != 0) |
6cebaf6e | 305 | xsnprintf (buf, sizeof (buf), "Thread %d.0x%lx", |
cc6bcb54 | 306 | ptid.pid (), ptid.tid ()); |
e38504b3 | 307 | else if (ptid.lwp () != 0) |
6cebaf6e | 308 | xsnprintf (buf, sizeof (buf), "LWP %d.%ld", |
e38504b3 | 309 | ptid.pid (), ptid.lwp ()); |
95954743 | 310 | else |
6cebaf6e | 311 | xsnprintf (buf, sizeof (buf), "Process %d", |
e99b03dc | 312 | ptid.pid ()); |
95954743 PA |
313 | |
314 | return buf; | |
315 | } | |
8336d594 | 316 | |
7255706c | 317 | int |
a780ef4f | 318 | kill_inferior (process_info *proc) |
7255706c | 319 | { |
a780ef4f | 320 | gdb_agent_about_to_close (proc->pid); |
7255706c | 321 | |
a780ef4f | 322 | return (*the_target->kill) (proc); |
7255706c | 323 | } |
70b90b91 YQ |
324 | |
325 | /* Target can do hardware single step. */ | |
326 | ||
327 | int | |
328 | target_can_do_hardware_single_step (void) | |
329 | { | |
330 | return 1; | |
331 | } | |
2e6ee069 AT |
332 | |
333 | /* Default implementation for breakpoint_kind_for_pc. | |
334 | ||
335 | The default behavior for targets that don't implement breakpoint_kind_for_pc | |
336 | is to use the size of a breakpoint as the kind. */ | |
337 | ||
338 | int | |
339 | default_breakpoint_kind_from_pc (CORE_ADDR *pcptr) | |
340 | { | |
341 | int size = 0; | |
342 | ||
343 | gdb_assert (the_target->sw_breakpoint_from_kind != NULL); | |
344 | ||
345 | (*the_target->sw_breakpoint_from_kind) (0, &size); | |
346 | return size; | |
347 | } | |
2090129c | 348 | |
223ffa71 TT |
349 | /* Define it. */ |
350 | ||
e671cd59 PA |
351 | target_terminal_state target_terminal::m_terminal_state |
352 | = target_terminal_state::is_ours; | |
223ffa71 | 353 | |
2090129c SDJ |
354 | /* See target/target.h. */ |
355 | ||
356 | void | |
223ffa71 | 357 | target_terminal::init () |
2090129c SDJ |
358 | { |
359 | /* Placeholder needed because of fork_inferior. Not necessary on | |
360 | GDBserver. */ | |
361 | } | |
362 | ||
363 | /* See target/target.h. */ | |
364 | ||
365 | void | |
223ffa71 | 366 | target_terminal::inferior () |
2090129c SDJ |
367 | { |
368 | /* Placeholder needed because of fork_inferior. Not necessary on | |
369 | GDBserver. */ | |
370 | } | |
371 | ||
372 | /* See target/target.h. */ | |
373 | ||
374 | void | |
223ffa71 | 375 | target_terminal::ours () |
2090129c SDJ |
376 | { |
377 | /* Placeholder needed because of fork_inferior. Not necessary on | |
378 | GDBserver. */ | |
379 | } | |
223ffa71 TT |
380 | |
381 | /* See target/target.h. */ | |
382 | ||
383 | void | |
384 | target_terminal::ours_for_output (void) | |
385 | { | |
386 | /* Placeholder. */ | |
387 | } | |
388 | ||
389 | /* See target/target.h. */ | |
390 | ||
391 | void | |
392 | target_terminal::info (const char *arg, int from_tty) | |
393 | { | |
394 | /* Placeholder. */ | |
395 | } |