Commit | Line | Data |
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ce3a066d | 1 | /* Target operations for the remote server for GDB. |
b811d2c2 | 2 | Copyright (C) 2002-2020 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 | 24 | |
5b6d1e4f | 25 | process_stratum_target *the_target; |
ce3a066d | 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 | 59 | |
79b44087 TBA |
60 | int res = the_target->pt->prepare_to_access_memory (); |
61 | if (res != 0) | |
62 | return res; | |
a67a9fae | 63 | |
bac608e7 SM |
64 | for_each_thread (prev_general_thread.pid (), [&] (thread_info *thread) |
65 | { | |
66 | if (mythread_alive (thread->id)) | |
67 | { | |
68 | if (stopped == NULL && the_target->thread_stopped != NULL | |
69 | && thread_stopped (thread)) | |
70 | stopped = thread; | |
71 | ||
72 | if (first == NULL) | |
73 | first = thread; | |
74 | ||
75 | if (current == NULL && prev_general_thread == thread->id) | |
76 | current = thread; | |
77 | } | |
78 | }); | |
79 | ||
80 | /* The thread we end up choosing. */ | |
81 | struct thread_info *thread; | |
a67a9fae PA |
82 | |
83 | /* Prefer a stopped thread. If none is found, try the current | |
84 | thread. Otherwise, take the first thread in the process. If | |
85 | none is found, undo the effects of | |
86 | target->prepare_to_access_memory() and return error. */ | |
bac608e7 SM |
87 | if (stopped != NULL) |
88 | thread = stopped; | |
89 | else if (current != NULL) | |
90 | thread = current; | |
91 | else if (first != NULL) | |
92 | thread = first; | |
a67a9fae PA |
93 | else |
94 | { | |
95 | done_accessing_memory (); | |
96 | return 1; | |
97 | } | |
98 | ||
99 | current_thread = thread; | |
c12a5089 | 100 | cs.general_thread = ptid_of (thread); |
a67a9fae PA |
101 | |
102 | return 0; | |
103 | } | |
104 | ||
105 | /* See target.h. */ | |
106 | ||
107 | void | |
108 | done_accessing_memory (void) | |
109 | { | |
c12a5089 SC |
110 | client_state &cs = get_client_state (); |
111 | ||
79b44087 | 112 | the_target->pt->done_accessing_memory (); |
a67a9fae PA |
113 | |
114 | /* Restore the previous selected thread. */ | |
c12a5089 | 115 | cs.general_thread = prev_general_thread; |
5b6d1e4f | 116 | switch_to_thread (the_target, cs.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 | 122 | int res; |
e2558df3 | 123 | res = the_target->pt->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 | ||
4196ab2a TT |
144 | /* See target/target.h. */ |
145 | ||
611cb4a5 | 146 | int |
4196ab2a TT |
147 | target_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, |
148 | ssize_t len) | |
0d62e5e8 | 149 | { |
c6778d00 TT |
150 | /* Make a copy of the data because check_mem_write may need to |
151 | update it. */ | |
d59b55f0 | 152 | gdb::byte_vector buffer (myaddr, myaddr + len); |
c6778d00 | 153 | check_mem_write (memaddr, buffer.data (), myaddr, len); |
e2558df3 | 154 | return the_target->pt->write_memory (memaddr, buffer.data (), len); |
0d62e5e8 DJ |
155 | } |
156 | ||
95954743 PA |
157 | ptid_t |
158 | mywait (ptid_t ptid, struct target_waitstatus *ourstatus, int options, | |
bd99dc85 | 159 | int connected_wait) |
611cb4a5 | 160 | { |
95954743 | 161 | ptid_t ret; |
0d62e5e8 DJ |
162 | |
163 | if (connected_wait) | |
164 | server_waiting = 1; | |
165 | ||
f2b9e3df | 166 | ret = target_wait (ptid, ourstatus, options); |
bd99dc85 | 167 | |
4210d83e PA |
168 | /* We don't expose _LOADED events to gdbserver core. See the |
169 | `dlls_changed' global. */ | |
170 | if (ourstatus->kind == TARGET_WAITKIND_LOADED) | |
171 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
172 | ||
1a3d890b PA |
173 | /* If GDB is connected through TCP/serial, then GDBserver will most |
174 | probably be running on its own terminal/console, so it's nice to | |
175 | print there why is GDBserver exiting. If however, GDB is | |
176 | connected through stdio, then there's no need to spam the GDB | |
177 | console with this -- the user will already see the exit through | |
178 | regular GDB output, in that same terminal. */ | |
179 | if (!remote_connection_is_stdio ()) | |
180 | { | |
181 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) | |
182 | fprintf (stderr, | |
183 | "\nChild exited with status %d\n", ourstatus->value.integer); | |
184 | else if (ourstatus->kind == TARGET_WAITKIND_SIGNALLED) | |
185 | fprintf (stderr, "\nChild terminated with signal = 0x%x (%s)\n", | |
186 | gdb_signal_to_host (ourstatus->value.sig), | |
187 | gdb_signal_to_name (ourstatus->value.sig)); | |
188 | } | |
0d62e5e8 DJ |
189 | |
190 | if (connected_wait) | |
191 | server_waiting = 0; | |
192 | ||
193 | return ret; | |
611cb4a5 DJ |
194 | } |
195 | ||
f8c1d06b GB |
196 | /* See target/target.h. */ |
197 | ||
198 | void | |
03f4463b | 199 | target_stop_and_wait (ptid_t ptid) |
f8c1d06b GB |
200 | { |
201 | struct target_waitstatus status; | |
3e6ec53a | 202 | bool was_non_stop = non_stop; |
17e16485 | 203 | struct thread_resume resume_info; |
f8c1d06b | 204 | |
17e16485 YQ |
205 | resume_info.thread = ptid; |
206 | resume_info.kind = resume_stop; | |
207 | resume_info.sig = GDB_SIGNAL_0; | |
0e4d7e35 | 208 | the_target->pt->resume (&resume_info, 1); |
f8c1d06b | 209 | |
3e6ec53a | 210 | non_stop = true; |
f8c1d06b GB |
211 | mywait (ptid, &status, 0, 0); |
212 | non_stop = was_non_stop; | |
213 | } | |
214 | ||
215 | /* See target/target.h. */ | |
216 | ||
f2b9e3df SDJ |
217 | ptid_t |
218 | target_wait (ptid_t ptid, struct target_waitstatus *status, int options) | |
219 | { | |
6532e7e3 | 220 | return the_target->pt->wait (ptid, status, options); |
f2b9e3df SDJ |
221 | } |
222 | ||
223 | /* See target/target.h. */ | |
224 | ||
bc1e6c81 SDJ |
225 | void |
226 | target_mourn_inferior (ptid_t ptid) | |
227 | { | |
8adb37b9 | 228 | the_target->pt->mourn (find_process_pid (ptid.pid ())); |
bc1e6c81 SDJ |
229 | } |
230 | ||
231 | /* See target/target.h. */ | |
232 | ||
f8c1d06b | 233 | void |
03f4463b | 234 | target_continue_no_signal (ptid_t ptid) |
f8c1d06b GB |
235 | { |
236 | struct thread_resume resume_info; | |
237 | ||
238 | resume_info.thread = ptid; | |
239 | resume_info.kind = resume_continue; | |
240 | resume_info.sig = GDB_SIGNAL_0; | |
0e4d7e35 | 241 | the_target->pt->resume (&resume_info, 1); |
f8c1d06b GB |
242 | } |
243 | ||
049a8570 SDJ |
244 | /* See target/target.h. */ |
245 | ||
246 | void | |
247 | target_continue (ptid_t ptid, enum gdb_signal signal) | |
248 | { | |
249 | struct thread_resume resume_info; | |
250 | ||
251 | resume_info.thread = ptid; | |
252 | resume_info.kind = resume_continue; | |
253 | resume_info.sig = gdb_signal_to_host (signal); | |
0e4d7e35 | 254 | the_target->pt->resume (&resume_info, 1); |
049a8570 SDJ |
255 | } |
256 | ||
1fb77080 SDJ |
257 | /* See target/target.h. */ |
258 | ||
259 | int | |
260 | target_supports_multi_process (void) | |
261 | { | |
262 | return (the_target->supports_multi_process != NULL ? | |
263 | (*the_target->supports_multi_process) () : 0); | |
264 | } | |
265 | ||
bd99dc85 PA |
266 | int |
267 | start_non_stop (int nonstop) | |
268 | { | |
269 | if (the_target->start_non_stop == NULL) | |
270 | { | |
271 | if (nonstop) | |
272 | return -1; | |
273 | else | |
274 | return 0; | |
275 | } | |
276 | ||
277 | return (*the_target->start_non_stop) (nonstop); | |
278 | } | |
279 | ||
ce3a066d | 280 | void |
5b6d1e4f | 281 | set_target_ops (process_stratum_target *target) |
ce3a066d | 282 | { |
5b6d1e4f | 283 | the_target = XNEW (process_stratum_target); |
ce3a066d DJ |
284 | memcpy (the_target, target, sizeof (*the_target)); |
285 | } | |
95954743 PA |
286 | |
287 | /* Convert pid to printable format. */ | |
288 | ||
289 | const char * | |
290 | target_pid_to_str (ptid_t ptid) | |
291 | { | |
292 | static char buf[80]; | |
293 | ||
d7e15655 | 294 | if (ptid == minus_one_ptid) |
6cebaf6e | 295 | xsnprintf (buf, sizeof (buf), "<all threads>"); |
d7e15655 | 296 | else if (ptid == null_ptid) |
6cebaf6e | 297 | xsnprintf (buf, sizeof (buf), "<null thread>"); |
cc6bcb54 | 298 | else if (ptid.tid () != 0) |
6cebaf6e | 299 | xsnprintf (buf, sizeof (buf), "Thread %d.0x%lx", |
cc6bcb54 | 300 | ptid.pid (), ptid.tid ()); |
e38504b3 | 301 | else if (ptid.lwp () != 0) |
6cebaf6e | 302 | xsnprintf (buf, sizeof (buf), "LWP %d.%ld", |
e38504b3 | 303 | ptid.pid (), ptid.lwp ()); |
95954743 | 304 | else |
6cebaf6e | 305 | xsnprintf (buf, sizeof (buf), "Process %d", |
e99b03dc | 306 | ptid.pid ()); |
95954743 PA |
307 | |
308 | return buf; | |
309 | } | |
8336d594 | 310 | |
7255706c | 311 | int |
a780ef4f | 312 | kill_inferior (process_info *proc) |
7255706c | 313 | { |
a780ef4f | 314 | gdb_agent_about_to_close (proc->pid); |
7255706c | 315 | |
c6885a57 | 316 | return the_target->pt->kill (proc); |
7255706c | 317 | } |
70b90b91 YQ |
318 | |
319 | /* Target can do hardware single step. */ | |
320 | ||
321 | int | |
322 | target_can_do_hardware_single_step (void) | |
323 | { | |
324 | return 1; | |
325 | } | |
2e6ee069 AT |
326 | |
327 | /* Default implementation for breakpoint_kind_for_pc. | |
328 | ||
329 | The default behavior for targets that don't implement breakpoint_kind_for_pc | |
330 | is to use the size of a breakpoint as the kind. */ | |
331 | ||
332 | int | |
333 | default_breakpoint_kind_from_pc (CORE_ADDR *pcptr) | |
334 | { | |
335 | int size = 0; | |
336 | ||
337 | gdb_assert (the_target->sw_breakpoint_from_kind != NULL); | |
338 | ||
339 | (*the_target->sw_breakpoint_from_kind) (0, &size); | |
340 | return size; | |
341 | } | |
2090129c | 342 | |
223ffa71 TT |
343 | /* Define it. */ |
344 | ||
e671cd59 PA |
345 | target_terminal_state target_terminal::m_terminal_state |
346 | = target_terminal_state::is_ours; | |
223ffa71 | 347 | |
2090129c SDJ |
348 | /* See target/target.h. */ |
349 | ||
350 | void | |
223ffa71 | 351 | target_terminal::init () |
2090129c SDJ |
352 | { |
353 | /* Placeholder needed because of fork_inferior. Not necessary on | |
354 | GDBserver. */ | |
355 | } | |
356 | ||
357 | /* See target/target.h. */ | |
358 | ||
359 | void | |
223ffa71 | 360 | target_terminal::inferior () |
2090129c SDJ |
361 | { |
362 | /* Placeholder needed because of fork_inferior. Not necessary on | |
363 | GDBserver. */ | |
364 | } | |
365 | ||
366 | /* See target/target.h. */ | |
367 | ||
368 | void | |
223ffa71 | 369 | target_terminal::ours () |
2090129c SDJ |
370 | { |
371 | /* Placeholder needed because of fork_inferior. Not necessary on | |
372 | GDBserver. */ | |
373 | } | |
223ffa71 TT |
374 | |
375 | /* See target/target.h. */ | |
376 | ||
377 | void | |
378 | target_terminal::ours_for_output (void) | |
379 | { | |
380 | /* Placeholder. */ | |
381 | } | |
382 | ||
383 | /* See target/target.h. */ | |
384 | ||
385 | void | |
386 | target_terminal::info (const char *arg, int from_tty) | |
387 | { | |
388 | /* Placeholder. */ | |
389 | } | |
6dee9afb TBA |
390 | |
391 | /* Default implementations of target ops. | |
392 | See target.h for definitions. */ | |
393 | ||
394 | void | |
395 | process_target::post_create_inferior () | |
396 | { | |
397 | /* Nop. */ | |
398 | } | |
79b44087 TBA |
399 | |
400 | int | |
401 | process_target::prepare_to_access_memory () | |
402 | { | |
403 | return 0; | |
404 | } | |
405 | ||
406 | void | |
407 | process_target::done_accessing_memory () | |
408 | { | |
409 | /* Nop. */ | |
410 | } | |
2a31c7aa TBA |
411 | |
412 | void | |
413 | process_target::look_up_symbols () | |
414 | { | |
415 | /* Nop. */ | |
416 | } | |
eac215cc TBA |
417 | |
418 | bool | |
419 | process_target::supports_read_auxv () | |
420 | { | |
421 | return false; | |
422 | } | |
423 | ||
424 | int | |
425 | process_target::read_auxv (CORE_ADDR offset, unsigned char *myaddr, | |
426 | unsigned int len) | |
427 | { | |
428 | gdb_assert_not_reached ("target op read_auxv not supported"); | |
429 | } | |
a2b2297a TBA |
430 | |
431 | bool | |
432 | process_target::supports_z_point_type (char z_type) | |
433 | { | |
434 | return false; | |
435 | } |