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 | { |
c12a5089 SC |
29 | client_state &cs = get_client_state (); |
30 | thread_info *found = find_thread_ptid (cs.general_thread); | |
0d62e5e8 | 31 | |
f0db101d PA |
32 | current_thread = found; |
33 | return (current_thread != NULL); | |
0d62e5e8 DJ |
34 | } |
35 | ||
a67a9fae PA |
36 | /* The thread that was current before prepare_to_access_memory was |
37 | called. done_accessing_memory uses this to restore the previous | |
38 | selected thread. */ | |
39 | static ptid_t prev_general_thread; | |
40 | ||
41 | /* See target.h. */ | |
42 | ||
43 | int | |
44 | prepare_to_access_memory (void) | |
45 | { | |
c12a5089 SC |
46 | client_state &cs = get_client_state (); |
47 | ||
bac608e7 SM |
48 | /* The first thread found. */ |
49 | struct thread_info *first = NULL; | |
50 | /* The first stopped thread found. */ | |
51 | struct thread_info *stopped = NULL; | |
52 | /* The current general thread, if found. */ | |
53 | struct thread_info *current = NULL; | |
a67a9fae | 54 | |
bac608e7 SM |
55 | /* Save the general thread value, since prepare_to_access_memory could change |
56 | it. */ | |
c12a5089 | 57 | prev_general_thread = cs.general_thread; |
a67a9fae PA |
58 | |
59 | if (the_target->prepare_to_access_memory != NULL) | |
60 | { | |
61 | int res; | |
62 | ||
63 | res = the_target->prepare_to_access_memory (); | |
64 | if (res != 0) | |
65 | return res; | |
66 | } | |
67 | ||
bac608e7 SM |
68 | for_each_thread (prev_general_thread.pid (), [&] (thread_info *thread) |
69 | { | |
70 | if (mythread_alive (thread->id)) | |
71 | { | |
72 | if (stopped == NULL && the_target->thread_stopped != NULL | |
73 | && thread_stopped (thread)) | |
74 | stopped = thread; | |
75 | ||
76 | if (first == NULL) | |
77 | first = thread; | |
78 | ||
79 | if (current == NULL && prev_general_thread == thread->id) | |
80 | current = thread; | |
81 | } | |
82 | }); | |
83 | ||
84 | /* The thread we end up choosing. */ | |
85 | struct thread_info *thread; | |
a67a9fae PA |
86 | |
87 | /* Prefer a stopped thread. If none is found, try the current | |
88 | thread. Otherwise, take the first thread in the process. If | |
89 | none is found, undo the effects of | |
90 | target->prepare_to_access_memory() and return error. */ | |
bac608e7 SM |
91 | if (stopped != NULL) |
92 | thread = stopped; | |
93 | else if (current != NULL) | |
94 | thread = current; | |
95 | else if (first != NULL) | |
96 | thread = first; | |
a67a9fae PA |
97 | else |
98 | { | |
99 | done_accessing_memory (); | |
100 | return 1; | |
101 | } | |
102 | ||
103 | current_thread = thread; | |
c12a5089 | 104 | cs.general_thread = ptid_of (thread); |
a67a9fae PA |
105 | |
106 | return 0; | |
107 | } | |
108 | ||
109 | /* See target.h. */ | |
110 | ||
111 | void | |
112 | done_accessing_memory (void) | |
113 | { | |
c12a5089 SC |
114 | client_state &cs = get_client_state (); |
115 | ||
a67a9fae PA |
116 | if (the_target->done_accessing_memory != NULL) |
117 | the_target->done_accessing_memory (); | |
118 | ||
119 | /* Restore the previous selected thread. */ | |
c12a5089 SC |
120 | cs.general_thread = prev_general_thread; |
121 | switch_to_thread (cs.general_thread); | |
a67a9fae PA |
122 | } |
123 | ||
c3e735a6 | 124 | int |
f450004a | 125 | read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
611cb4a5 | 126 | { |
c3e735a6 DJ |
127 | int res; |
128 | res = (*the_target->read_memory) (memaddr, myaddr, len); | |
611cb4a5 | 129 | check_mem_read (memaddr, myaddr, len); |
c3e735a6 | 130 | return res; |
611cb4a5 DJ |
131 | } |
132 | ||
721ec300 GB |
133 | /* See target/target.h. */ |
134 | ||
135 | int | |
136 | target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len) | |
137 | { | |
138 | return read_inferior_memory (memaddr, myaddr, len); | |
139 | } | |
140 | ||
141 | /* See target/target.h. */ | |
142 | ||
143 | int | |
144 | target_read_uint32 (CORE_ADDR memaddr, uint32_t *result) | |
145 | { | |
146 | return read_inferior_memory (memaddr, (gdb_byte *) result, sizeof (*result)); | |
147 | } | |
148 | ||
611cb4a5 | 149 | int |
f450004a DJ |
150 | write_inferior_memory (CORE_ADDR memaddr, const unsigned char *myaddr, |
151 | int len) | |
0d62e5e8 DJ |
152 | { |
153 | /* Lacking cleanups, there is some potential for a memory leak if the | |
154 | write fails and we go through error(). Make sure that no more than | |
155 | one buffer is ever pending by making BUFFER static. */ | |
f450004a | 156 | static unsigned char *buffer = 0; |
0d62e5e8 DJ |
157 | int res; |
158 | ||
159 | if (buffer != NULL) | |
160 | free (buffer); | |
161 | ||
224c3ddb | 162 | buffer = (unsigned char *) xmalloc (len); |
0d62e5e8 | 163 | memcpy (buffer, myaddr, len); |
b9fd1791 | 164 | check_mem_write (memaddr, buffer, myaddr, len); |
0d62e5e8 DJ |
165 | res = (*the_target->write_memory) (memaddr, buffer, len); |
166 | free (buffer); | |
167 | buffer = NULL; | |
168 | ||
169 | return res; | |
170 | } | |
171 | ||
721ec300 GB |
172 | /* See target/target.h. */ |
173 | ||
174 | int | |
175 | target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr, ssize_t len) | |
176 | { | |
177 | return write_inferior_memory (memaddr, myaddr, len); | |
178 | } | |
179 | ||
95954743 PA |
180 | ptid_t |
181 | mywait (ptid_t ptid, struct target_waitstatus *ourstatus, int options, | |
bd99dc85 | 182 | int connected_wait) |
611cb4a5 | 183 | { |
95954743 | 184 | ptid_t ret; |
0d62e5e8 DJ |
185 | |
186 | if (connected_wait) | |
187 | server_waiting = 1; | |
188 | ||
f2b9e3df | 189 | ret = target_wait (ptid, ourstatus, options); |
bd99dc85 | 190 | |
4210d83e PA |
191 | /* We don't expose _LOADED events to gdbserver core. See the |
192 | `dlls_changed' global. */ | |
193 | if (ourstatus->kind == TARGET_WAITKIND_LOADED) | |
194 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
195 | ||
1a3d890b PA |
196 | /* If GDB is connected through TCP/serial, then GDBserver will most |
197 | probably be running on its own terminal/console, so it's nice to | |
198 | print there why is GDBserver exiting. If however, GDB is | |
199 | connected through stdio, then there's no need to spam the GDB | |
200 | console with this -- the user will already see the exit through | |
201 | regular GDB output, in that same terminal. */ | |
202 | if (!remote_connection_is_stdio ()) | |
203 | { | |
204 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) | |
205 | fprintf (stderr, | |
206 | "\nChild exited with status %d\n", ourstatus->value.integer); | |
207 | else if (ourstatus->kind == TARGET_WAITKIND_SIGNALLED) | |
208 | fprintf (stderr, "\nChild terminated with signal = 0x%x (%s)\n", | |
209 | gdb_signal_to_host (ourstatus->value.sig), | |
210 | gdb_signal_to_name (ourstatus->value.sig)); | |
211 | } | |
0d62e5e8 DJ |
212 | |
213 | if (connected_wait) | |
214 | server_waiting = 0; | |
215 | ||
216 | return ret; | |
611cb4a5 DJ |
217 | } |
218 | ||
f8c1d06b GB |
219 | /* See target/target.h. */ |
220 | ||
221 | void | |
03f4463b | 222 | target_stop_and_wait (ptid_t ptid) |
f8c1d06b GB |
223 | { |
224 | struct target_waitstatus status; | |
225 | int was_non_stop = non_stop; | |
17e16485 | 226 | struct thread_resume resume_info; |
f8c1d06b | 227 | |
17e16485 YQ |
228 | resume_info.thread = ptid; |
229 | resume_info.kind = resume_stop; | |
230 | resume_info.sig = GDB_SIGNAL_0; | |
231 | (*the_target->resume) (&resume_info, 1); | |
f8c1d06b GB |
232 | |
233 | non_stop = 1; | |
234 | mywait (ptid, &status, 0, 0); | |
235 | non_stop = was_non_stop; | |
236 | } | |
237 | ||
238 | /* See target/target.h. */ | |
239 | ||
f2b9e3df SDJ |
240 | ptid_t |
241 | target_wait (ptid_t ptid, struct target_waitstatus *status, int options) | |
242 | { | |
243 | return (*the_target->wait) (ptid, status, options); | |
244 | } | |
245 | ||
246 | /* See target/target.h. */ | |
247 | ||
bc1e6c81 SDJ |
248 | void |
249 | target_mourn_inferior (ptid_t ptid) | |
250 | { | |
e99b03dc | 251 | (*the_target->mourn) (find_process_pid (ptid.pid ())); |
bc1e6c81 SDJ |
252 | } |
253 | ||
254 | /* See target/target.h. */ | |
255 | ||
f8c1d06b | 256 | void |
03f4463b | 257 | target_continue_no_signal (ptid_t ptid) |
f8c1d06b GB |
258 | { |
259 | struct thread_resume resume_info; | |
260 | ||
261 | resume_info.thread = ptid; | |
262 | resume_info.kind = resume_continue; | |
263 | resume_info.sig = GDB_SIGNAL_0; | |
264 | (*the_target->resume) (&resume_info, 1); | |
265 | } | |
266 | ||
049a8570 SDJ |
267 | /* See target/target.h. */ |
268 | ||
269 | void | |
270 | target_continue (ptid_t ptid, enum gdb_signal signal) | |
271 | { | |
272 | struct thread_resume resume_info; | |
273 | ||
274 | resume_info.thread = ptid; | |
275 | resume_info.kind = resume_continue; | |
276 | resume_info.sig = gdb_signal_to_host (signal); | |
277 | (*the_target->resume) (&resume_info, 1); | |
278 | } | |
279 | ||
1fb77080 SDJ |
280 | /* See target/target.h. */ |
281 | ||
282 | int | |
283 | target_supports_multi_process (void) | |
284 | { | |
285 | return (the_target->supports_multi_process != NULL ? | |
286 | (*the_target->supports_multi_process) () : 0); | |
287 | } | |
288 | ||
bd99dc85 PA |
289 | int |
290 | start_non_stop (int nonstop) | |
291 | { | |
292 | if (the_target->start_non_stop == NULL) | |
293 | { | |
294 | if (nonstop) | |
295 | return -1; | |
296 | else | |
297 | return 0; | |
298 | } | |
299 | ||
300 | return (*the_target->start_non_stop) (nonstop); | |
301 | } | |
302 | ||
ce3a066d DJ |
303 | void |
304 | set_target_ops (struct target_ops *target) | |
305 | { | |
8d749320 | 306 | the_target = XNEW (struct target_ops); |
ce3a066d DJ |
307 | memcpy (the_target, target, sizeof (*the_target)); |
308 | } | |
95954743 PA |
309 | |
310 | /* Convert pid to printable format. */ | |
311 | ||
312 | const char * | |
313 | target_pid_to_str (ptid_t ptid) | |
314 | { | |
315 | static char buf[80]; | |
316 | ||
d7e15655 | 317 | if (ptid == minus_one_ptid) |
6cebaf6e | 318 | xsnprintf (buf, sizeof (buf), "<all threads>"); |
d7e15655 | 319 | else if (ptid == null_ptid) |
6cebaf6e | 320 | xsnprintf (buf, sizeof (buf), "<null thread>"); |
cc6bcb54 | 321 | else if (ptid.tid () != 0) |
6cebaf6e | 322 | xsnprintf (buf, sizeof (buf), "Thread %d.0x%lx", |
cc6bcb54 | 323 | ptid.pid (), ptid.tid ()); |
e38504b3 | 324 | else if (ptid.lwp () != 0) |
6cebaf6e | 325 | xsnprintf (buf, sizeof (buf), "LWP %d.%ld", |
e38504b3 | 326 | ptid.pid (), ptid.lwp ()); |
95954743 | 327 | else |
6cebaf6e | 328 | xsnprintf (buf, sizeof (buf), "Process %d", |
e99b03dc | 329 | ptid.pid ()); |
95954743 PA |
330 | |
331 | return buf; | |
332 | } | |
8336d594 | 333 | |
7255706c | 334 | int |
a780ef4f | 335 | kill_inferior (process_info *proc) |
7255706c | 336 | { |
a780ef4f | 337 | gdb_agent_about_to_close (proc->pid); |
7255706c | 338 | |
a780ef4f | 339 | return (*the_target->kill) (proc); |
7255706c | 340 | } |
70b90b91 YQ |
341 | |
342 | /* Target can do hardware single step. */ | |
343 | ||
344 | int | |
345 | target_can_do_hardware_single_step (void) | |
346 | { | |
347 | return 1; | |
348 | } | |
2e6ee069 AT |
349 | |
350 | /* Default implementation for breakpoint_kind_for_pc. | |
351 | ||
352 | The default behavior for targets that don't implement breakpoint_kind_for_pc | |
353 | is to use the size of a breakpoint as the kind. */ | |
354 | ||
355 | int | |
356 | default_breakpoint_kind_from_pc (CORE_ADDR *pcptr) | |
357 | { | |
358 | int size = 0; | |
359 | ||
360 | gdb_assert (the_target->sw_breakpoint_from_kind != NULL); | |
361 | ||
362 | (*the_target->sw_breakpoint_from_kind) (0, &size); | |
363 | return size; | |
364 | } | |
2090129c | 365 | |
223ffa71 TT |
366 | /* Define it. */ |
367 | ||
e671cd59 PA |
368 | target_terminal_state target_terminal::m_terminal_state |
369 | = target_terminal_state::is_ours; | |
223ffa71 | 370 | |
2090129c SDJ |
371 | /* See target/target.h. */ |
372 | ||
373 | void | |
223ffa71 | 374 | target_terminal::init () |
2090129c SDJ |
375 | { |
376 | /* Placeholder needed because of fork_inferior. Not necessary on | |
377 | GDBserver. */ | |
378 | } | |
379 | ||
380 | /* See target/target.h. */ | |
381 | ||
382 | void | |
223ffa71 | 383 | target_terminal::inferior () |
2090129c SDJ |
384 | { |
385 | /* Placeholder needed because of fork_inferior. Not necessary on | |
386 | GDBserver. */ | |
387 | } | |
388 | ||
389 | /* See target/target.h. */ | |
390 | ||
391 | void | |
223ffa71 | 392 | target_terminal::ours () |
2090129c SDJ |
393 | { |
394 | /* Placeholder needed because of fork_inferior. Not necessary on | |
395 | GDBserver. */ | |
396 | } | |
223ffa71 TT |
397 | |
398 | /* See target/target.h. */ | |
399 | ||
400 | void | |
401 | target_terminal::ours_for_output (void) | |
402 | { | |
403 | /* Placeholder. */ | |
404 | } | |
405 | ||
406 | /* See target/target.h. */ | |
407 | ||
408 | void | |
409 | target_terminal::info (const char *arg, int from_tty) | |
410 | { | |
411 | /* Placeholder. */ | |
412 | } |