Commit | Line | Data |
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ce3a066d | 1 | /* Target operations for the remote server for GDB. |
e2882c85 | 2 | Copyright (C) 2002-2018 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" |
ce3a066d DJ |
23 | |
24 | struct target_ops *the_target; | |
25 | ||
f0db101d | 26 | int |
f557a88a | 27 | set_desired_thread () |
0d62e5e8 | 28 | { |
f557a88a | 29 | thread_info *found = find_thread_ptid (general_thread); |
0d62e5e8 | 30 | |
f0db101d PA |
31 | current_thread = found; |
32 | return (current_thread != NULL); | |
0d62e5e8 DJ |
33 | } |
34 | ||
a67a9fae PA |
35 | /* The thread that was current before prepare_to_access_memory was |
36 | called. done_accessing_memory uses this to restore the previous | |
37 | selected thread. */ | |
38 | static ptid_t prev_general_thread; | |
39 | ||
40 | /* See target.h. */ | |
41 | ||
42 | int | |
43 | prepare_to_access_memory (void) | |
44 | { | |
bac608e7 SM |
45 | /* The first thread found. */ |
46 | struct thread_info *first = NULL; | |
47 | /* The first stopped thread found. */ | |
48 | struct thread_info *stopped = NULL; | |
49 | /* The current general thread, if found. */ | |
50 | struct thread_info *current = NULL; | |
a67a9fae | 51 | |
bac608e7 SM |
52 | /* Save the general thread value, since prepare_to_access_memory could change |
53 | it. */ | |
a67a9fae PA |
54 | prev_general_thread = general_thread; |
55 | ||
56 | if (the_target->prepare_to_access_memory != NULL) | |
57 | { | |
58 | int res; | |
59 | ||
60 | res = the_target->prepare_to_access_memory (); | |
61 | if (res != 0) | |
62 | return res; | |
63 | } | |
64 | ||
bac608e7 SM |
65 | for_each_thread (prev_general_thread.pid (), [&] (thread_info *thread) |
66 | { | |
67 | if (mythread_alive (thread->id)) | |
68 | { | |
69 | if (stopped == NULL && the_target->thread_stopped != NULL | |
70 | && thread_stopped (thread)) | |
71 | stopped = thread; | |
72 | ||
73 | if (first == NULL) | |
74 | first = thread; | |
75 | ||
76 | if (current == NULL && prev_general_thread == thread->id) | |
77 | current = thread; | |
78 | } | |
79 | }); | |
80 | ||
81 | /* The thread we end up choosing. */ | |
82 | struct thread_info *thread; | |
a67a9fae PA |
83 | |
84 | /* Prefer a stopped thread. If none is found, try the current | |
85 | thread. Otherwise, take the first thread in the process. If | |
86 | none is found, undo the effects of | |
87 | target->prepare_to_access_memory() and return error. */ | |
bac608e7 SM |
88 | if (stopped != NULL) |
89 | thread = stopped; | |
90 | else if (current != NULL) | |
91 | thread = current; | |
92 | else if (first != NULL) | |
93 | thread = first; | |
a67a9fae PA |
94 | else |
95 | { | |
96 | done_accessing_memory (); | |
97 | return 1; | |
98 | } | |
99 | ||
100 | current_thread = thread; | |
101 | general_thread = ptid_of (thread); | |
102 | ||
103 | return 0; | |
104 | } | |
105 | ||
106 | /* See target.h. */ | |
107 | ||
108 | void | |
109 | done_accessing_memory (void) | |
110 | { | |
111 | if (the_target->done_accessing_memory != NULL) | |
112 | the_target->done_accessing_memory (); | |
113 | ||
114 | /* Restore the previous selected thread. */ | |
115 | general_thread = prev_general_thread; | |
75352e28 | 116 | switch_to_thread (general_thread); |
a67a9fae PA |
117 | } |
118 | ||
c3e735a6 | 119 | int |
f450004a | 120 | read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
611cb4a5 | 121 | { |
c3e735a6 DJ |
122 | int res; |
123 | res = (*the_target->read_memory) (memaddr, myaddr, len); | |
611cb4a5 | 124 | check_mem_read (memaddr, myaddr, len); |
c3e735a6 | 125 | return res; |
611cb4a5 DJ |
126 | } |
127 | ||
721ec300 GB |
128 | /* See target/target.h. */ |
129 | ||
130 | int | |
131 | target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len) | |
132 | { | |
133 | return read_inferior_memory (memaddr, myaddr, len); | |
134 | } | |
135 | ||
136 | /* See target/target.h. */ | |
137 | ||
138 | int | |
139 | target_read_uint32 (CORE_ADDR memaddr, uint32_t *result) | |
140 | { | |
141 | return read_inferior_memory (memaddr, (gdb_byte *) result, sizeof (*result)); | |
142 | } | |
143 | ||
611cb4a5 | 144 | int |
f450004a DJ |
145 | write_inferior_memory (CORE_ADDR memaddr, const unsigned char *myaddr, |
146 | int len) | |
0d62e5e8 DJ |
147 | { |
148 | /* Lacking cleanups, there is some potential for a memory leak if the | |
149 | write fails and we go through error(). Make sure that no more than | |
150 | one buffer is ever pending by making BUFFER static. */ | |
f450004a | 151 | static unsigned char *buffer = 0; |
0d62e5e8 DJ |
152 | int res; |
153 | ||
154 | if (buffer != NULL) | |
155 | free (buffer); | |
156 | ||
224c3ddb | 157 | buffer = (unsigned char *) xmalloc (len); |
0d62e5e8 | 158 | memcpy (buffer, myaddr, len); |
b9fd1791 | 159 | check_mem_write (memaddr, buffer, myaddr, len); |
0d62e5e8 DJ |
160 | res = (*the_target->write_memory) (memaddr, buffer, len); |
161 | free (buffer); | |
162 | buffer = NULL; | |
163 | ||
164 | return res; | |
165 | } | |
166 | ||
721ec300 GB |
167 | /* See target/target.h. */ |
168 | ||
169 | int | |
170 | target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr, ssize_t len) | |
171 | { | |
172 | return write_inferior_memory (memaddr, myaddr, len); | |
173 | } | |
174 | ||
95954743 PA |
175 | ptid_t |
176 | mywait (ptid_t ptid, struct target_waitstatus *ourstatus, int options, | |
bd99dc85 | 177 | int connected_wait) |
611cb4a5 | 178 | { |
95954743 | 179 | ptid_t ret; |
0d62e5e8 DJ |
180 | |
181 | if (connected_wait) | |
182 | server_waiting = 1; | |
183 | ||
f2b9e3df | 184 | ret = target_wait (ptid, ourstatus, options); |
bd99dc85 | 185 | |
4210d83e PA |
186 | /* We don't expose _LOADED events to gdbserver core. See the |
187 | `dlls_changed' global. */ | |
188 | if (ourstatus->kind == TARGET_WAITKIND_LOADED) | |
189 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
190 | ||
1a3d890b PA |
191 | /* If GDB is connected through TCP/serial, then GDBserver will most |
192 | probably be running on its own terminal/console, so it's nice to | |
193 | print there why is GDBserver exiting. If however, GDB is | |
194 | connected through stdio, then there's no need to spam the GDB | |
195 | console with this -- the user will already see the exit through | |
196 | regular GDB output, in that same terminal. */ | |
197 | if (!remote_connection_is_stdio ()) | |
198 | { | |
199 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) | |
200 | fprintf (stderr, | |
201 | "\nChild exited with status %d\n", ourstatus->value.integer); | |
202 | else if (ourstatus->kind == TARGET_WAITKIND_SIGNALLED) | |
203 | fprintf (stderr, "\nChild terminated with signal = 0x%x (%s)\n", | |
204 | gdb_signal_to_host (ourstatus->value.sig), | |
205 | gdb_signal_to_name (ourstatus->value.sig)); | |
206 | } | |
0d62e5e8 DJ |
207 | |
208 | if (connected_wait) | |
209 | server_waiting = 0; | |
210 | ||
211 | return ret; | |
611cb4a5 DJ |
212 | } |
213 | ||
f8c1d06b GB |
214 | /* See target/target.h. */ |
215 | ||
216 | void | |
03f4463b | 217 | target_stop_and_wait (ptid_t ptid) |
f8c1d06b GB |
218 | { |
219 | struct target_waitstatus status; | |
220 | int was_non_stop = non_stop; | |
17e16485 | 221 | struct thread_resume resume_info; |
f8c1d06b | 222 | |
17e16485 YQ |
223 | resume_info.thread = ptid; |
224 | resume_info.kind = resume_stop; | |
225 | resume_info.sig = GDB_SIGNAL_0; | |
226 | (*the_target->resume) (&resume_info, 1); | |
f8c1d06b GB |
227 | |
228 | non_stop = 1; | |
229 | mywait (ptid, &status, 0, 0); | |
230 | non_stop = was_non_stop; | |
231 | } | |
232 | ||
233 | /* See target/target.h. */ | |
234 | ||
f2b9e3df SDJ |
235 | ptid_t |
236 | target_wait (ptid_t ptid, struct target_waitstatus *status, int options) | |
237 | { | |
238 | return (*the_target->wait) (ptid, status, options); | |
239 | } | |
240 | ||
241 | /* See target/target.h. */ | |
242 | ||
bc1e6c81 SDJ |
243 | void |
244 | target_mourn_inferior (ptid_t ptid) | |
245 | { | |
246 | (*the_target->mourn) (find_process_pid (ptid_get_pid (ptid))); | |
247 | } | |
248 | ||
249 | /* See target/target.h. */ | |
250 | ||
f8c1d06b | 251 | void |
03f4463b | 252 | target_continue_no_signal (ptid_t ptid) |
f8c1d06b GB |
253 | { |
254 | struct thread_resume resume_info; | |
255 | ||
256 | resume_info.thread = ptid; | |
257 | resume_info.kind = resume_continue; | |
258 | resume_info.sig = GDB_SIGNAL_0; | |
259 | (*the_target->resume) (&resume_info, 1); | |
260 | } | |
261 | ||
049a8570 SDJ |
262 | /* See target/target.h. */ |
263 | ||
264 | void | |
265 | target_continue (ptid_t ptid, enum gdb_signal signal) | |
266 | { | |
267 | struct thread_resume resume_info; | |
268 | ||
269 | resume_info.thread = ptid; | |
270 | resume_info.kind = resume_continue; | |
271 | resume_info.sig = gdb_signal_to_host (signal); | |
272 | (*the_target->resume) (&resume_info, 1); | |
273 | } | |
274 | ||
1fb77080 SDJ |
275 | /* See target/target.h. */ |
276 | ||
277 | int | |
278 | target_supports_multi_process (void) | |
279 | { | |
280 | return (the_target->supports_multi_process != NULL ? | |
281 | (*the_target->supports_multi_process) () : 0); | |
282 | } | |
283 | ||
bd99dc85 PA |
284 | int |
285 | start_non_stop (int nonstop) | |
286 | { | |
287 | if (the_target->start_non_stop == NULL) | |
288 | { | |
289 | if (nonstop) | |
290 | return -1; | |
291 | else | |
292 | return 0; | |
293 | } | |
294 | ||
295 | return (*the_target->start_non_stop) (nonstop); | |
296 | } | |
297 | ||
ce3a066d DJ |
298 | void |
299 | set_target_ops (struct target_ops *target) | |
300 | { | |
8d749320 | 301 | the_target = XNEW (struct target_ops); |
ce3a066d DJ |
302 | memcpy (the_target, target, sizeof (*the_target)); |
303 | } | |
95954743 PA |
304 | |
305 | /* Convert pid to printable format. */ | |
306 | ||
307 | const char * | |
308 | target_pid_to_str (ptid_t ptid) | |
309 | { | |
310 | static char buf[80]; | |
311 | ||
312 | if (ptid_equal (ptid, minus_one_ptid)) | |
6cebaf6e | 313 | xsnprintf (buf, sizeof (buf), "<all threads>"); |
95954743 | 314 | else if (ptid_equal (ptid, null_ptid)) |
6cebaf6e | 315 | xsnprintf (buf, sizeof (buf), "<null thread>"); |
95954743 | 316 | else if (ptid_get_tid (ptid) != 0) |
6cebaf6e | 317 | xsnprintf (buf, sizeof (buf), "Thread %d.0x%lx", |
318 | ptid_get_pid (ptid), ptid_get_tid (ptid)); | |
95954743 | 319 | else if (ptid_get_lwp (ptid) != 0) |
6cebaf6e | 320 | xsnprintf (buf, sizeof (buf), "LWP %d.%ld", |
321 | ptid_get_pid (ptid), ptid_get_lwp (ptid)); | |
95954743 | 322 | else |
6cebaf6e | 323 | xsnprintf (buf, sizeof (buf), "Process %d", |
324 | ptid_get_pid (ptid)); | |
95954743 PA |
325 | |
326 | return buf; | |
327 | } | |
8336d594 | 328 | |
7255706c YQ |
329 | int |
330 | kill_inferior (int pid) | |
331 | { | |
332 | gdb_agent_about_to_close (pid); | |
333 | ||
334 | return (*the_target->kill) (pid); | |
335 | } | |
70b90b91 YQ |
336 | |
337 | /* Target can do hardware single step. */ | |
338 | ||
339 | int | |
340 | target_can_do_hardware_single_step (void) | |
341 | { | |
342 | return 1; | |
343 | } | |
2e6ee069 AT |
344 | |
345 | /* Default implementation for breakpoint_kind_for_pc. | |
346 | ||
347 | The default behavior for targets that don't implement breakpoint_kind_for_pc | |
348 | is to use the size of a breakpoint as the kind. */ | |
349 | ||
350 | int | |
351 | default_breakpoint_kind_from_pc (CORE_ADDR *pcptr) | |
352 | { | |
353 | int size = 0; | |
354 | ||
355 | gdb_assert (the_target->sw_breakpoint_from_kind != NULL); | |
356 | ||
357 | (*the_target->sw_breakpoint_from_kind) (0, &size); | |
358 | return size; | |
359 | } | |
2090129c | 360 | |
223ffa71 TT |
361 | /* Define it. */ |
362 | ||
363 | enum target_terminal::terminal_state target_terminal::terminal_state | |
364 | = target_terminal::terminal_is_ours; | |
365 | ||
2090129c SDJ |
366 | /* See target/target.h. */ |
367 | ||
368 | void | |
223ffa71 | 369 | target_terminal::init () |
2090129c SDJ |
370 | { |
371 | /* Placeholder needed because of fork_inferior. Not necessary on | |
372 | GDBserver. */ | |
373 | } | |
374 | ||
375 | /* See target/target.h. */ | |
376 | ||
377 | void | |
223ffa71 | 378 | target_terminal::inferior () |
2090129c SDJ |
379 | { |
380 | /* Placeholder needed because of fork_inferior. Not necessary on | |
381 | GDBserver. */ | |
382 | } | |
383 | ||
384 | /* See target/target.h. */ | |
385 | ||
386 | void | |
223ffa71 | 387 | target_terminal::ours () |
2090129c SDJ |
388 | { |
389 | /* Placeholder needed because of fork_inferior. Not necessary on | |
390 | GDBserver. */ | |
391 | } | |
223ffa71 TT |
392 | |
393 | /* See target/target.h. */ | |
394 | ||
395 | void | |
396 | target_terminal::ours_for_output (void) | |
397 | { | |
398 | /* Placeholder. */ | |
399 | } | |
400 | ||
401 | /* See target/target.h. */ | |
402 | ||
403 | void | |
404 | target_terminal::info (const char *arg, int from_tty) | |
405 | { | |
406 | /* Placeholder. */ | |
407 | } |