Commit | Line | Data |
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ce3a066d | 1 | /* Target operations for the remote server for GDB. |
61baf725 | 2 | Copyright (C) 2002-2017 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 | /* Structure used to look up a thread to use as current when accessing |
36 | memory. */ | |
37 | ||
38 | struct thread_search | |
39 | { | |
40 | /* The PTID of the current general thread. This is an input | |
41 | parameter. */ | |
42 | ptid_t current_gen_ptid; | |
43 | ||
44 | /* The first thread found. */ | |
45 | struct thread_info *first; | |
46 | ||
47 | /* The first stopped thread found. */ | |
48 | struct thread_info *stopped; | |
49 | ||
50 | /* The current general thread, if found. */ | |
51 | struct thread_info *current; | |
52 | }; | |
53 | ||
54 | /* Callback for find_inferior. Search for a thread to use as current | |
55 | when accessing memory. */ | |
56 | ||
57 | static int | |
58 | thread_search_callback (struct inferior_list_entry *entry, void *args) | |
59 | { | |
60 | struct thread_info *thread = (struct thread_info *) entry; | |
61 | struct thread_search *s = (struct thread_search *) args; | |
62 | ||
63 | if (ptid_get_pid (entry->id) == ptid_get_pid (s->current_gen_ptid) | |
64 | && mythread_alive (ptid_of (thread))) | |
65 | { | |
0e50fe5c JB |
66 | if (s->stopped == NULL |
67 | && the_target->thread_stopped != NULL | |
68 | && thread_stopped (thread)) | |
a67a9fae PA |
69 | s->stopped = thread; |
70 | ||
71 | if (s->first == NULL) | |
72 | s->first = thread; | |
73 | ||
74 | if (s->current == NULL && ptid_equal (s->current_gen_ptid, entry->id)) | |
75 | s->current = thread; | |
76 | } | |
77 | ||
78 | return 0; | |
79 | } | |
80 | ||
81 | /* The thread that was current before prepare_to_access_memory was | |
82 | called. done_accessing_memory uses this to restore the previous | |
83 | selected thread. */ | |
84 | static ptid_t prev_general_thread; | |
85 | ||
86 | /* See target.h. */ | |
87 | ||
88 | int | |
89 | prepare_to_access_memory (void) | |
90 | { | |
91 | struct thread_search search; | |
92 | struct thread_info *thread; | |
93 | ||
94 | memset (&search, 0, sizeof (search)); | |
95 | search.current_gen_ptid = general_thread; | |
96 | prev_general_thread = general_thread; | |
97 | ||
98 | if (the_target->prepare_to_access_memory != NULL) | |
99 | { | |
100 | int res; | |
101 | ||
102 | res = the_target->prepare_to_access_memory (); | |
103 | if (res != 0) | |
104 | return res; | |
105 | } | |
106 | ||
107 | find_inferior (&all_threads, thread_search_callback, &search); | |
108 | ||
109 | /* Prefer a stopped thread. If none is found, try the current | |
110 | thread. Otherwise, take the first thread in the process. If | |
111 | none is found, undo the effects of | |
112 | target->prepare_to_access_memory() and return error. */ | |
113 | if (search.stopped != NULL) | |
114 | thread = search.stopped; | |
115 | else if (search.current != NULL) | |
116 | thread = search.current; | |
117 | else if (search.first != NULL) | |
118 | thread = search.first; | |
119 | else | |
120 | { | |
121 | done_accessing_memory (); | |
122 | return 1; | |
123 | } | |
124 | ||
125 | current_thread = thread; | |
126 | general_thread = ptid_of (thread); | |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
131 | /* See target.h. */ | |
132 | ||
133 | void | |
134 | done_accessing_memory (void) | |
135 | { | |
136 | if (the_target->done_accessing_memory != NULL) | |
137 | the_target->done_accessing_memory (); | |
138 | ||
139 | /* Restore the previous selected thread. */ | |
140 | general_thread = prev_general_thread; | |
75352e28 | 141 | switch_to_thread (general_thread); |
a67a9fae PA |
142 | } |
143 | ||
c3e735a6 | 144 | int |
f450004a | 145 | read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
611cb4a5 | 146 | { |
c3e735a6 DJ |
147 | int res; |
148 | res = (*the_target->read_memory) (memaddr, myaddr, len); | |
611cb4a5 | 149 | check_mem_read (memaddr, myaddr, len); |
c3e735a6 | 150 | return res; |
611cb4a5 DJ |
151 | } |
152 | ||
721ec300 GB |
153 | /* See target/target.h. */ |
154 | ||
155 | int | |
156 | target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len) | |
157 | { | |
158 | return read_inferior_memory (memaddr, myaddr, len); | |
159 | } | |
160 | ||
161 | /* See target/target.h. */ | |
162 | ||
163 | int | |
164 | target_read_uint32 (CORE_ADDR memaddr, uint32_t *result) | |
165 | { | |
166 | return read_inferior_memory (memaddr, (gdb_byte *) result, sizeof (*result)); | |
167 | } | |
168 | ||
611cb4a5 | 169 | int |
f450004a DJ |
170 | write_inferior_memory (CORE_ADDR memaddr, const unsigned char *myaddr, |
171 | int len) | |
0d62e5e8 DJ |
172 | { |
173 | /* Lacking cleanups, there is some potential for a memory leak if the | |
174 | write fails and we go through error(). Make sure that no more than | |
175 | one buffer is ever pending by making BUFFER static. */ | |
f450004a | 176 | static unsigned char *buffer = 0; |
0d62e5e8 DJ |
177 | int res; |
178 | ||
179 | if (buffer != NULL) | |
180 | free (buffer); | |
181 | ||
224c3ddb | 182 | buffer = (unsigned char *) xmalloc (len); |
0d62e5e8 | 183 | memcpy (buffer, myaddr, len); |
b9fd1791 | 184 | check_mem_write (memaddr, buffer, myaddr, len); |
0d62e5e8 DJ |
185 | res = (*the_target->write_memory) (memaddr, buffer, len); |
186 | free (buffer); | |
187 | buffer = NULL; | |
188 | ||
189 | return res; | |
190 | } | |
191 | ||
721ec300 GB |
192 | /* See target/target.h. */ |
193 | ||
194 | int | |
195 | target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr, ssize_t len) | |
196 | { | |
197 | return write_inferior_memory (memaddr, myaddr, len); | |
198 | } | |
199 | ||
95954743 PA |
200 | ptid_t |
201 | mywait (ptid_t ptid, struct target_waitstatus *ourstatus, int options, | |
bd99dc85 | 202 | int connected_wait) |
611cb4a5 | 203 | { |
95954743 | 204 | ptid_t ret; |
0d62e5e8 DJ |
205 | |
206 | if (connected_wait) | |
207 | server_waiting = 1; | |
208 | ||
f2b9e3df | 209 | ret = target_wait (ptid, ourstatus, options); |
bd99dc85 | 210 | |
4210d83e PA |
211 | /* We don't expose _LOADED events to gdbserver core. See the |
212 | `dlls_changed' global. */ | |
213 | if (ourstatus->kind == TARGET_WAITKIND_LOADED) | |
214 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
215 | ||
1a3d890b PA |
216 | /* If GDB is connected through TCP/serial, then GDBserver will most |
217 | probably be running on its own terminal/console, so it's nice to | |
218 | print there why is GDBserver exiting. If however, GDB is | |
219 | connected through stdio, then there's no need to spam the GDB | |
220 | console with this -- the user will already see the exit through | |
221 | regular GDB output, in that same terminal. */ | |
222 | if (!remote_connection_is_stdio ()) | |
223 | { | |
224 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) | |
225 | fprintf (stderr, | |
226 | "\nChild exited with status %d\n", ourstatus->value.integer); | |
227 | else if (ourstatus->kind == TARGET_WAITKIND_SIGNALLED) | |
228 | fprintf (stderr, "\nChild terminated with signal = 0x%x (%s)\n", | |
229 | gdb_signal_to_host (ourstatus->value.sig), | |
230 | gdb_signal_to_name (ourstatus->value.sig)); | |
231 | } | |
0d62e5e8 DJ |
232 | |
233 | if (connected_wait) | |
234 | server_waiting = 0; | |
235 | ||
236 | return ret; | |
611cb4a5 DJ |
237 | } |
238 | ||
f8c1d06b GB |
239 | /* See target/target.h. */ |
240 | ||
241 | void | |
03f4463b | 242 | target_stop_and_wait (ptid_t ptid) |
f8c1d06b GB |
243 | { |
244 | struct target_waitstatus status; | |
245 | int was_non_stop = non_stop; | |
17e16485 | 246 | struct thread_resume resume_info; |
f8c1d06b | 247 | |
17e16485 YQ |
248 | resume_info.thread = ptid; |
249 | resume_info.kind = resume_stop; | |
250 | resume_info.sig = GDB_SIGNAL_0; | |
251 | (*the_target->resume) (&resume_info, 1); | |
f8c1d06b GB |
252 | |
253 | non_stop = 1; | |
254 | mywait (ptid, &status, 0, 0); | |
255 | non_stop = was_non_stop; | |
256 | } | |
257 | ||
258 | /* See target/target.h. */ | |
259 | ||
f2b9e3df SDJ |
260 | ptid_t |
261 | target_wait (ptid_t ptid, struct target_waitstatus *status, int options) | |
262 | { | |
263 | return (*the_target->wait) (ptid, status, options); | |
264 | } | |
265 | ||
266 | /* See target/target.h. */ | |
267 | ||
bc1e6c81 SDJ |
268 | void |
269 | target_mourn_inferior (ptid_t ptid) | |
270 | { | |
271 | (*the_target->mourn) (find_process_pid (ptid_get_pid (ptid))); | |
272 | } | |
273 | ||
274 | /* See target/target.h. */ | |
275 | ||
f8c1d06b | 276 | void |
03f4463b | 277 | target_continue_no_signal (ptid_t ptid) |
f8c1d06b GB |
278 | { |
279 | struct thread_resume resume_info; | |
280 | ||
281 | resume_info.thread = ptid; | |
282 | resume_info.kind = resume_continue; | |
283 | resume_info.sig = GDB_SIGNAL_0; | |
284 | (*the_target->resume) (&resume_info, 1); | |
285 | } | |
286 | ||
049a8570 SDJ |
287 | /* See target/target.h. */ |
288 | ||
289 | void | |
290 | target_continue (ptid_t ptid, enum gdb_signal signal) | |
291 | { | |
292 | struct thread_resume resume_info; | |
293 | ||
294 | resume_info.thread = ptid; | |
295 | resume_info.kind = resume_continue; | |
296 | resume_info.sig = gdb_signal_to_host (signal); | |
297 | (*the_target->resume) (&resume_info, 1); | |
298 | } | |
299 | ||
1fb77080 SDJ |
300 | /* See target/target.h. */ |
301 | ||
302 | int | |
303 | target_supports_multi_process (void) | |
304 | { | |
305 | return (the_target->supports_multi_process != NULL ? | |
306 | (*the_target->supports_multi_process) () : 0); | |
307 | } | |
308 | ||
bd99dc85 PA |
309 | int |
310 | start_non_stop (int nonstop) | |
311 | { | |
312 | if (the_target->start_non_stop == NULL) | |
313 | { | |
314 | if (nonstop) | |
315 | return -1; | |
316 | else | |
317 | return 0; | |
318 | } | |
319 | ||
320 | return (*the_target->start_non_stop) (nonstop); | |
321 | } | |
322 | ||
ce3a066d DJ |
323 | void |
324 | set_target_ops (struct target_ops *target) | |
325 | { | |
8d749320 | 326 | the_target = XNEW (struct target_ops); |
ce3a066d DJ |
327 | memcpy (the_target, target, sizeof (*the_target)); |
328 | } | |
95954743 PA |
329 | |
330 | /* Convert pid to printable format. */ | |
331 | ||
332 | const char * | |
333 | target_pid_to_str (ptid_t ptid) | |
334 | { | |
335 | static char buf[80]; | |
336 | ||
337 | if (ptid_equal (ptid, minus_one_ptid)) | |
6cebaf6e | 338 | xsnprintf (buf, sizeof (buf), "<all threads>"); |
95954743 | 339 | else if (ptid_equal (ptid, null_ptid)) |
6cebaf6e | 340 | xsnprintf (buf, sizeof (buf), "<null thread>"); |
95954743 | 341 | else if (ptid_get_tid (ptid) != 0) |
6cebaf6e | 342 | xsnprintf (buf, sizeof (buf), "Thread %d.0x%lx", |
343 | ptid_get_pid (ptid), ptid_get_tid (ptid)); | |
95954743 | 344 | else if (ptid_get_lwp (ptid) != 0) |
6cebaf6e | 345 | xsnprintf (buf, sizeof (buf), "LWP %d.%ld", |
346 | ptid_get_pid (ptid), ptid_get_lwp (ptid)); | |
95954743 | 347 | else |
6cebaf6e | 348 | xsnprintf (buf, sizeof (buf), "Process %d", |
349 | ptid_get_pid (ptid)); | |
95954743 PA |
350 | |
351 | return buf; | |
352 | } | |
8336d594 | 353 | |
7255706c YQ |
354 | int |
355 | kill_inferior (int pid) | |
356 | { | |
357 | gdb_agent_about_to_close (pid); | |
358 | ||
359 | return (*the_target->kill) (pid); | |
360 | } | |
70b90b91 YQ |
361 | |
362 | /* Target can do hardware single step. */ | |
363 | ||
364 | int | |
365 | target_can_do_hardware_single_step (void) | |
366 | { | |
367 | return 1; | |
368 | } | |
2e6ee069 AT |
369 | |
370 | /* Default implementation for breakpoint_kind_for_pc. | |
371 | ||
372 | The default behavior for targets that don't implement breakpoint_kind_for_pc | |
373 | is to use the size of a breakpoint as the kind. */ | |
374 | ||
375 | int | |
376 | default_breakpoint_kind_from_pc (CORE_ADDR *pcptr) | |
377 | { | |
378 | int size = 0; | |
379 | ||
380 | gdb_assert (the_target->sw_breakpoint_from_kind != NULL); | |
381 | ||
382 | (*the_target->sw_breakpoint_from_kind) (0, &size); | |
383 | return size; | |
384 | } | |
2090129c | 385 | |
223ffa71 TT |
386 | /* Define it. */ |
387 | ||
388 | enum target_terminal::terminal_state target_terminal::terminal_state | |
389 | = target_terminal::terminal_is_ours; | |
390 | ||
2090129c SDJ |
391 | /* See target/target.h. */ |
392 | ||
393 | void | |
223ffa71 | 394 | target_terminal::init () |
2090129c SDJ |
395 | { |
396 | /* Placeholder needed because of fork_inferior. Not necessary on | |
397 | GDBserver. */ | |
398 | } | |
399 | ||
400 | /* See target/target.h. */ | |
401 | ||
402 | void | |
223ffa71 | 403 | target_terminal::inferior () |
2090129c SDJ |
404 | { |
405 | /* Placeholder needed because of fork_inferior. Not necessary on | |
406 | GDBserver. */ | |
407 | } | |
408 | ||
409 | /* See target/target.h. */ | |
410 | ||
411 | void | |
223ffa71 | 412 | target_terminal::ours () |
2090129c SDJ |
413 | { |
414 | /* Placeholder needed because of fork_inferior. Not necessary on | |
415 | GDBserver. */ | |
416 | } | |
223ffa71 TT |
417 | |
418 | /* See target/target.h. */ | |
419 | ||
420 | void | |
421 | target_terminal::ours_for_output (void) | |
422 | { | |
423 | /* Placeholder. */ | |
424 | } | |
425 | ||
426 | /* See target/target.h. */ | |
427 | ||
428 | void | |
429 | target_terminal::info (const char *arg, int from_tty) | |
430 | { | |
431 | /* Placeholder. */ | |
432 | } |