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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" |
ea06bbaa | 24 | #include "hostio.h" |
ce3a066d | 25 | |
5b6d1e4f | 26 | process_stratum_target *the_target; |
ce3a066d | 27 | |
f0db101d | 28 | int |
f557a88a | 29 | set_desired_thread () |
0d62e5e8 | 30 | { |
c12a5089 SC |
31 | client_state &cs = get_client_state (); |
32 | thread_info *found = find_thread_ptid (cs.general_thread); | |
0d62e5e8 | 33 | |
f0db101d PA |
34 | current_thread = found; |
35 | return (current_thread != NULL); | |
0d62e5e8 DJ |
36 | } |
37 | ||
a67a9fae PA |
38 | /* The thread that was current before prepare_to_access_memory was |
39 | called. done_accessing_memory uses this to restore the previous | |
40 | selected thread. */ | |
41 | static ptid_t prev_general_thread; | |
42 | ||
43 | /* See target.h. */ | |
44 | ||
45 | int | |
46 | prepare_to_access_memory (void) | |
47 | { | |
c12a5089 SC |
48 | client_state &cs = get_client_state (); |
49 | ||
bac608e7 SM |
50 | /* The first thread found. */ |
51 | struct thread_info *first = NULL; | |
52 | /* The first stopped thread found. */ | |
53 | struct thread_info *stopped = NULL; | |
54 | /* The current general thread, if found. */ | |
55 | struct thread_info *current = NULL; | |
a67a9fae | 56 | |
bac608e7 SM |
57 | /* Save the general thread value, since prepare_to_access_memory could change |
58 | it. */ | |
c12a5089 | 59 | prev_general_thread = cs.general_thread; |
a67a9fae | 60 | |
79b44087 TBA |
61 | int res = the_target->pt->prepare_to_access_memory (); |
62 | if (res != 0) | |
63 | return res; | |
a67a9fae | 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; | |
c12a5089 | 101 | cs.general_thread = ptid_of (thread); |
a67a9fae PA |
102 | |
103 | return 0; | |
104 | } | |
105 | ||
106 | /* See target.h. */ | |
107 | ||
108 | void | |
109 | done_accessing_memory (void) | |
110 | { | |
c12a5089 SC |
111 | client_state &cs = get_client_state (); |
112 | ||
79b44087 | 113 | the_target->pt->done_accessing_memory (); |
a67a9fae PA |
114 | |
115 | /* Restore the previous selected thread. */ | |
c12a5089 | 116 | cs.general_thread = prev_general_thread; |
5b6d1e4f | 117 | switch_to_thread (the_target, cs.general_thread); |
a67a9fae PA |
118 | } |
119 | ||
c3e735a6 | 120 | int |
f450004a | 121 | read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
611cb4a5 | 122 | { |
c3e735a6 | 123 | int res; |
e2558df3 | 124 | res = the_target->pt->read_memory (memaddr, myaddr, len); |
611cb4a5 | 125 | check_mem_read (memaddr, myaddr, len); |
c3e735a6 | 126 | return res; |
611cb4a5 DJ |
127 | } |
128 | ||
721ec300 GB |
129 | /* See target/target.h. */ |
130 | ||
131 | int | |
132 | target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len) | |
133 | { | |
134 | return read_inferior_memory (memaddr, myaddr, len); | |
135 | } | |
136 | ||
137 | /* See target/target.h. */ | |
138 | ||
139 | int | |
140 | target_read_uint32 (CORE_ADDR memaddr, uint32_t *result) | |
141 | { | |
142 | return read_inferior_memory (memaddr, (gdb_byte *) result, sizeof (*result)); | |
143 | } | |
144 | ||
4196ab2a TT |
145 | /* See target/target.h. */ |
146 | ||
611cb4a5 | 147 | int |
4196ab2a TT |
148 | target_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, |
149 | ssize_t len) | |
0d62e5e8 | 150 | { |
c6778d00 TT |
151 | /* Make a copy of the data because check_mem_write may need to |
152 | update it. */ | |
d59b55f0 | 153 | gdb::byte_vector buffer (myaddr, myaddr + len); |
c6778d00 | 154 | check_mem_write (memaddr, buffer.data (), myaddr, len); |
e2558df3 | 155 | return the_target->pt->write_memory (memaddr, buffer.data (), len); |
0d62e5e8 DJ |
156 | } |
157 | ||
95954743 PA |
158 | ptid_t |
159 | mywait (ptid_t ptid, struct target_waitstatus *ourstatus, int options, | |
bd99dc85 | 160 | int connected_wait) |
611cb4a5 | 161 | { |
95954743 | 162 | ptid_t ret; |
0d62e5e8 DJ |
163 | |
164 | if (connected_wait) | |
165 | server_waiting = 1; | |
166 | ||
f2b9e3df | 167 | ret = target_wait (ptid, ourstatus, options); |
bd99dc85 | 168 | |
4210d83e PA |
169 | /* We don't expose _LOADED events to gdbserver core. See the |
170 | `dlls_changed' global. */ | |
171 | if (ourstatus->kind == TARGET_WAITKIND_LOADED) | |
172 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
173 | ||
1a3d890b PA |
174 | /* If GDB is connected through TCP/serial, then GDBserver will most |
175 | probably be running on its own terminal/console, so it's nice to | |
176 | print there why is GDBserver exiting. If however, GDB is | |
177 | connected through stdio, then there's no need to spam the GDB | |
178 | console with this -- the user will already see the exit through | |
179 | regular GDB output, in that same terminal. */ | |
180 | if (!remote_connection_is_stdio ()) | |
181 | { | |
182 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) | |
183 | fprintf (stderr, | |
184 | "\nChild exited with status %d\n", ourstatus->value.integer); | |
185 | else if (ourstatus->kind == TARGET_WAITKIND_SIGNALLED) | |
186 | fprintf (stderr, "\nChild terminated with signal = 0x%x (%s)\n", | |
187 | gdb_signal_to_host (ourstatus->value.sig), | |
188 | gdb_signal_to_name (ourstatus->value.sig)); | |
189 | } | |
0d62e5e8 DJ |
190 | |
191 | if (connected_wait) | |
192 | server_waiting = 0; | |
193 | ||
194 | return ret; | |
611cb4a5 DJ |
195 | } |
196 | ||
f8c1d06b GB |
197 | /* See target/target.h. */ |
198 | ||
199 | void | |
03f4463b | 200 | target_stop_and_wait (ptid_t ptid) |
f8c1d06b GB |
201 | { |
202 | struct target_waitstatus status; | |
3e6ec53a | 203 | bool was_non_stop = non_stop; |
17e16485 | 204 | struct thread_resume resume_info; |
f8c1d06b | 205 | |
17e16485 YQ |
206 | resume_info.thread = ptid; |
207 | resume_info.kind = resume_stop; | |
208 | resume_info.sig = GDB_SIGNAL_0; | |
0e4d7e35 | 209 | the_target->pt->resume (&resume_info, 1); |
f8c1d06b | 210 | |
3e6ec53a | 211 | non_stop = true; |
f8c1d06b GB |
212 | mywait (ptid, &status, 0, 0); |
213 | non_stop = was_non_stop; | |
214 | } | |
215 | ||
216 | /* See target/target.h. */ | |
217 | ||
f2b9e3df SDJ |
218 | ptid_t |
219 | target_wait (ptid_t ptid, struct target_waitstatus *status, int options) | |
220 | { | |
6532e7e3 | 221 | return the_target->pt->wait (ptid, status, options); |
f2b9e3df SDJ |
222 | } |
223 | ||
224 | /* See target/target.h. */ | |
225 | ||
bc1e6c81 SDJ |
226 | void |
227 | target_mourn_inferior (ptid_t ptid) | |
228 | { | |
8adb37b9 | 229 | the_target->pt->mourn (find_process_pid (ptid.pid ())); |
bc1e6c81 SDJ |
230 | } |
231 | ||
232 | /* See target/target.h. */ | |
233 | ||
f8c1d06b | 234 | void |
03f4463b | 235 | target_continue_no_signal (ptid_t ptid) |
f8c1d06b GB |
236 | { |
237 | struct thread_resume resume_info; | |
238 | ||
239 | resume_info.thread = ptid; | |
240 | resume_info.kind = resume_continue; | |
241 | resume_info.sig = GDB_SIGNAL_0; | |
0e4d7e35 | 242 | the_target->pt->resume (&resume_info, 1); |
f8c1d06b GB |
243 | } |
244 | ||
049a8570 SDJ |
245 | /* See target/target.h. */ |
246 | ||
247 | void | |
248 | target_continue (ptid_t ptid, enum gdb_signal signal) | |
249 | { | |
250 | struct thread_resume resume_info; | |
251 | ||
252 | resume_info.thread = ptid; | |
253 | resume_info.kind = resume_continue; | |
254 | resume_info.sig = gdb_signal_to_host (signal); | |
0e4d7e35 | 255 | the_target->pt->resume (&resume_info, 1); |
049a8570 SDJ |
256 | } |
257 | ||
1fb77080 SDJ |
258 | /* See target/target.h. */ |
259 | ||
260 | int | |
261 | target_supports_multi_process (void) | |
262 | { | |
263 | return (the_target->supports_multi_process != NULL ? | |
264 | (*the_target->supports_multi_process) () : 0); | |
265 | } | |
266 | ||
bd99dc85 PA |
267 | int |
268 | start_non_stop (int nonstop) | |
269 | { | |
270 | if (the_target->start_non_stop == NULL) | |
271 | { | |
272 | if (nonstop) | |
273 | return -1; | |
274 | else | |
275 | return 0; | |
276 | } | |
277 | ||
278 | return (*the_target->start_non_stop) (nonstop); | |
279 | } | |
280 | ||
ce3a066d | 281 | void |
5b6d1e4f | 282 | set_target_ops (process_stratum_target *target) |
ce3a066d | 283 | { |
5b6d1e4f | 284 | the_target = XNEW (process_stratum_target); |
ce3a066d DJ |
285 | memcpy (the_target, target, sizeof (*the_target)); |
286 | } | |
95954743 PA |
287 | |
288 | /* Convert pid to printable format. */ | |
289 | ||
290 | const char * | |
291 | target_pid_to_str (ptid_t ptid) | |
292 | { | |
293 | static char buf[80]; | |
294 | ||
d7e15655 | 295 | if (ptid == minus_one_ptid) |
6cebaf6e | 296 | xsnprintf (buf, sizeof (buf), "<all threads>"); |
d7e15655 | 297 | else if (ptid == null_ptid) |
6cebaf6e | 298 | xsnprintf (buf, sizeof (buf), "<null thread>"); |
cc6bcb54 | 299 | else if (ptid.tid () != 0) |
6cebaf6e | 300 | xsnprintf (buf, sizeof (buf), "Thread %d.0x%lx", |
cc6bcb54 | 301 | ptid.pid (), ptid.tid ()); |
e38504b3 | 302 | else if (ptid.lwp () != 0) |
6cebaf6e | 303 | xsnprintf (buf, sizeof (buf), "LWP %d.%ld", |
e38504b3 | 304 | ptid.pid (), ptid.lwp ()); |
95954743 | 305 | else |
6cebaf6e | 306 | xsnprintf (buf, sizeof (buf), "Process %d", |
e99b03dc | 307 | ptid.pid ()); |
95954743 PA |
308 | |
309 | return buf; | |
310 | } | |
8336d594 | 311 | |
7255706c | 312 | int |
a780ef4f | 313 | kill_inferior (process_info *proc) |
7255706c | 314 | { |
a780ef4f | 315 | gdb_agent_about_to_close (proc->pid); |
7255706c | 316 | |
c6885a57 | 317 | return the_target->pt->kill (proc); |
7255706c | 318 | } |
70b90b91 | 319 | |
2e6ee069 AT |
320 | /* Default implementation for breakpoint_kind_for_pc. |
321 | ||
322 | The default behavior for targets that don't implement breakpoint_kind_for_pc | |
323 | is to use the size of a breakpoint as the kind. */ | |
324 | ||
325 | int | |
326 | default_breakpoint_kind_from_pc (CORE_ADDR *pcptr) | |
327 | { | |
328 | int size = 0; | |
329 | ||
330 | gdb_assert (the_target->sw_breakpoint_from_kind != NULL); | |
331 | ||
332 | (*the_target->sw_breakpoint_from_kind) (0, &size); | |
333 | return size; | |
334 | } | |
2090129c | 335 | |
223ffa71 TT |
336 | /* Define it. */ |
337 | ||
e671cd59 PA |
338 | target_terminal_state target_terminal::m_terminal_state |
339 | = target_terminal_state::is_ours; | |
223ffa71 | 340 | |
2090129c SDJ |
341 | /* See target/target.h. */ |
342 | ||
343 | void | |
223ffa71 | 344 | target_terminal::init () |
2090129c SDJ |
345 | { |
346 | /* Placeholder needed because of fork_inferior. Not necessary on | |
347 | GDBserver. */ | |
348 | } | |
349 | ||
350 | /* See target/target.h. */ | |
351 | ||
352 | void | |
223ffa71 | 353 | target_terminal::inferior () |
2090129c SDJ |
354 | { |
355 | /* Placeholder needed because of fork_inferior. Not necessary on | |
356 | GDBserver. */ | |
357 | } | |
358 | ||
359 | /* See target/target.h. */ | |
360 | ||
361 | void | |
223ffa71 | 362 | target_terminal::ours () |
2090129c SDJ |
363 | { |
364 | /* Placeholder needed because of fork_inferior. Not necessary on | |
365 | GDBserver. */ | |
366 | } | |
223ffa71 TT |
367 | |
368 | /* See target/target.h. */ | |
369 | ||
370 | void | |
371 | target_terminal::ours_for_output (void) | |
372 | { | |
373 | /* Placeholder. */ | |
374 | } | |
375 | ||
376 | /* See target/target.h. */ | |
377 | ||
378 | void | |
379 | target_terminal::info (const char *arg, int from_tty) | |
380 | { | |
381 | /* Placeholder. */ | |
382 | } | |
6dee9afb TBA |
383 | |
384 | /* Default implementations of target ops. | |
385 | See target.h for definitions. */ | |
386 | ||
387 | void | |
388 | process_target::post_create_inferior () | |
389 | { | |
390 | /* Nop. */ | |
391 | } | |
79b44087 TBA |
392 | |
393 | int | |
394 | process_target::prepare_to_access_memory () | |
395 | { | |
396 | return 0; | |
397 | } | |
398 | ||
399 | void | |
400 | process_target::done_accessing_memory () | |
401 | { | |
402 | /* Nop. */ | |
403 | } | |
2a31c7aa TBA |
404 | |
405 | void | |
406 | process_target::look_up_symbols () | |
407 | { | |
408 | /* Nop. */ | |
409 | } | |
eac215cc TBA |
410 | |
411 | bool | |
412 | process_target::supports_read_auxv () | |
413 | { | |
414 | return false; | |
415 | } | |
416 | ||
417 | int | |
418 | process_target::read_auxv (CORE_ADDR offset, unsigned char *myaddr, | |
419 | unsigned int len) | |
420 | { | |
421 | gdb_assert_not_reached ("target op read_auxv not supported"); | |
422 | } | |
a2b2297a TBA |
423 | |
424 | bool | |
425 | process_target::supports_z_point_type (char z_type) | |
426 | { | |
427 | return false; | |
428 | } | |
7e0bde70 TBA |
429 | |
430 | int | |
431 | process_target::insert_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
432 | int size, raw_breakpoint *bp) | |
433 | { | |
434 | return 1; | |
435 | } | |
436 | ||
437 | int | |
438 | process_target::remove_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
439 | int size, raw_breakpoint *bp) | |
440 | { | |
441 | return 1; | |
442 | } | |
84320c4e TBA |
443 | |
444 | bool | |
445 | process_target::stopped_by_sw_breakpoint () | |
446 | { | |
447 | return false; | |
448 | } | |
449 | ||
450 | bool | |
451 | process_target::supports_stopped_by_sw_breakpoint () | |
452 | { | |
453 | return false; | |
454 | } | |
93fe88b2 TBA |
455 | |
456 | bool | |
457 | process_target::stopped_by_hw_breakpoint () | |
458 | { | |
459 | return false; | |
460 | } | |
461 | ||
462 | bool | |
463 | process_target::supports_stopped_by_hw_breakpoint () | |
464 | { | |
465 | return false; | |
466 | } | |
22aa6223 TBA |
467 | |
468 | bool | |
469 | process_target::supports_hardware_single_step () | |
470 | { | |
471 | return false; | |
472 | } | |
6eeb5c55 TBA |
473 | |
474 | bool | |
475 | process_target::stopped_by_watchpoint () | |
476 | { | |
477 | return false; | |
478 | } | |
479 | ||
480 | CORE_ADDR | |
481 | process_target::stopped_data_address () | |
482 | { | |
483 | return 0; | |
484 | } | |
5203ae1e TBA |
485 | |
486 | bool | |
487 | process_target::supports_read_offsets () | |
488 | { | |
489 | return false; | |
490 | } | |
491 | ||
492 | int | |
493 | process_target::read_offsets (CORE_ADDR *text, CORE_ADDR *data) | |
494 | { | |
495 | gdb_assert_not_reached ("target op read_offsets not supported"); | |
496 | } | |
6e3fd7e9 TBA |
497 | |
498 | bool | |
499 | process_target::supports_get_tls_address () | |
500 | { | |
501 | return false; | |
502 | } | |
503 | ||
504 | int | |
505 | process_target::get_tls_address (thread_info *thread, CORE_ADDR offset, | |
506 | CORE_ADDR load_module, CORE_ADDR *address) | |
507 | { | |
508 | gdb_assert_not_reached ("target op get_tls_address not supported"); | |
509 | } | |
ea06bbaa TBA |
510 | |
511 | void | |
512 | process_target::hostio_last_error (char *buf) | |
513 | { | |
514 | hostio_last_error_from_errno (buf); | |
515 | } | |
2d0795ee TBA |
516 | |
517 | bool | |
518 | process_target::supports_qxfer_osdata () | |
519 | { | |
520 | return false; | |
521 | } | |
522 | ||
523 | int | |
524 | process_target::qxfer_osdata (const char *annex, unsigned char *readbuf, | |
525 | unsigned const char *writebuf, | |
526 | CORE_ADDR offset, int len) | |
527 | { | |
528 | gdb_assert_not_reached ("target op qxfer_osdata not supported"); | |
529 | } | |
d7abedf7 TBA |
530 | |
531 | bool | |
532 | process_target::supports_qxfer_siginfo () | |
533 | { | |
534 | return false; | |
535 | } | |
536 | ||
537 | int | |
538 | process_target::qxfer_siginfo (const char *annex, unsigned char *readbuf, | |
539 | unsigned const char *writebuf, | |
540 | CORE_ADDR offset, int len) | |
541 | { | |
542 | gdb_assert_not_reached ("target op qxfer_siginfo not supported"); | |
543 | } |