1 /* Target operations for the remote server for GDB.
2 Copyright (C) 2002-2017 Free Software Foundation, Inc.
4 Contributed by MontaVista Software.
6 This file is part of GDB.
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
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
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.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 #include "tracepoint.h"
24 struct target_ops *the_target;
27 set_desired_thread (int use_general)
29 struct thread_info *found;
32 found = find_thread_ptid (general_thread);
34 found = find_thread_ptid (cont_thread);
36 current_thread = found;
37 return (current_thread != NULL);
40 /* Structure used to look up a thread to use as current when accessing
45 /* The PTID of the current general thread. This is an input
47 ptid_t current_gen_ptid;
49 /* The first thread found. */
50 struct thread_info *first;
52 /* The first stopped thread found. */
53 struct thread_info *stopped;
55 /* The current general thread, if found. */
56 struct thread_info *current;
59 /* Callback for find_inferior. Search for a thread to use as current
60 when accessing memory. */
63 thread_search_callback (struct inferior_list_entry *entry, void *args)
65 struct thread_info *thread = (struct thread_info *) entry;
66 struct thread_search *s = (struct thread_search *) args;
68 if (ptid_get_pid (entry->id) == ptid_get_pid (s->current_gen_ptid)
69 && mythread_alive (ptid_of (thread)))
71 if (s->stopped == NULL
72 && the_target->thread_stopped != NULL
73 && thread_stopped (thread))
79 if (s->current == NULL && ptid_equal (s->current_gen_ptid, entry->id))
86 /* The thread that was current before prepare_to_access_memory was
87 called. done_accessing_memory uses this to restore the previous
89 static ptid_t prev_general_thread;
94 prepare_to_access_memory (void)
96 struct thread_search search;
97 struct thread_info *thread;
99 memset (&search, 0, sizeof (search));
100 search.current_gen_ptid = general_thread;
101 prev_general_thread = general_thread;
103 if (the_target->prepare_to_access_memory != NULL)
107 res = the_target->prepare_to_access_memory ();
112 find_inferior (&all_threads, thread_search_callback, &search);
114 /* Prefer a stopped thread. If none is found, try the current
115 thread. Otherwise, take the first thread in the process. If
116 none is found, undo the effects of
117 target->prepare_to_access_memory() and return error. */
118 if (search.stopped != NULL)
119 thread = search.stopped;
120 else if (search.current != NULL)
121 thread = search.current;
122 else if (search.first != NULL)
123 thread = search.first;
126 done_accessing_memory ();
130 current_thread = thread;
131 general_thread = ptid_of (thread);
139 done_accessing_memory (void)
141 if (the_target->done_accessing_memory != NULL)
142 the_target->done_accessing_memory ();
144 /* Restore the previous selected thread. */
145 general_thread = prev_general_thread;
146 current_thread = find_thread_ptid (general_thread);
150 read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len)
153 res = (*the_target->read_memory) (memaddr, myaddr, len);
154 check_mem_read (memaddr, myaddr, len);
158 /* See target/target.h. */
161 target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len)
163 return read_inferior_memory (memaddr, myaddr, len);
166 /* See target/target.h. */
169 target_read_uint32 (CORE_ADDR memaddr, uint32_t *result)
171 return read_inferior_memory (memaddr, (gdb_byte *) result, sizeof (*result));
175 write_inferior_memory (CORE_ADDR memaddr, const unsigned char *myaddr,
178 /* Lacking cleanups, there is some potential for a memory leak if the
179 write fails and we go through error(). Make sure that no more than
180 one buffer is ever pending by making BUFFER static. */
181 static unsigned char *buffer = 0;
187 buffer = (unsigned char *) xmalloc (len);
188 memcpy (buffer, myaddr, len);
189 check_mem_write (memaddr, buffer, myaddr, len);
190 res = (*the_target->write_memory) (memaddr, buffer, len);
197 /* See target/target.h. */
200 target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr, ssize_t len)
202 return write_inferior_memory (memaddr, myaddr, len);
206 mywait (ptid_t ptid, struct target_waitstatus *ourstatus, int options,
214 ret = target_wait (ptid, ourstatus, options);
216 /* We don't expose _LOADED events to gdbserver core. See the
217 `dlls_changed' global. */
218 if (ourstatus->kind == TARGET_WAITKIND_LOADED)
219 ourstatus->kind = TARGET_WAITKIND_STOPPED;
221 /* If GDB is connected through TCP/serial, then GDBserver will most
222 probably be running on its own terminal/console, so it's nice to
223 print there why is GDBserver exiting. If however, GDB is
224 connected through stdio, then there's no need to spam the GDB
225 console with this -- the user will already see the exit through
226 regular GDB output, in that same terminal. */
227 if (!remote_connection_is_stdio ())
229 if (ourstatus->kind == TARGET_WAITKIND_EXITED)
231 "\nChild exited with status %d\n", ourstatus->value.integer);
232 else if (ourstatus->kind == TARGET_WAITKIND_SIGNALLED)
233 fprintf (stderr, "\nChild terminated with signal = 0x%x (%s)\n",
234 gdb_signal_to_host (ourstatus->value.sig),
235 gdb_signal_to_name (ourstatus->value.sig));
244 /* See target/target.h. */
247 target_stop_and_wait (ptid_t ptid)
249 struct target_waitstatus status;
250 int was_non_stop = non_stop;
251 struct thread_resume resume_info;
253 resume_info.thread = ptid;
254 resume_info.kind = resume_stop;
255 resume_info.sig = GDB_SIGNAL_0;
256 (*the_target->resume) (&resume_info, 1);
259 mywait (ptid, &status, 0, 0);
260 non_stop = was_non_stop;
263 /* See target/target.h. */
266 target_wait (ptid_t ptid, struct target_waitstatus *status, int options)
268 return (*the_target->wait) (ptid, status, options);
271 /* See target/target.h. */
274 target_mourn_inferior (ptid_t ptid)
276 (*the_target->mourn) (find_process_pid (ptid_get_pid (ptid)));
279 /* See target/target.h. */
282 target_continue_no_signal (ptid_t ptid)
284 struct thread_resume resume_info;
286 resume_info.thread = ptid;
287 resume_info.kind = resume_continue;
288 resume_info.sig = GDB_SIGNAL_0;
289 (*the_target->resume) (&resume_info, 1);
292 /* See target/target.h. */
295 target_continue (ptid_t ptid, enum gdb_signal signal)
297 struct thread_resume resume_info;
299 resume_info.thread = ptid;
300 resume_info.kind = resume_continue;
301 resume_info.sig = gdb_signal_to_host (signal);
302 (*the_target->resume) (&resume_info, 1);
305 /* See target/target.h. */
308 target_supports_multi_process (void)
310 return (the_target->supports_multi_process != NULL ?
311 (*the_target->supports_multi_process) () : 0);
315 start_non_stop (int nonstop)
317 if (the_target->start_non_stop == NULL)
325 return (*the_target->start_non_stop) (nonstop);
329 set_target_ops (struct target_ops *target)
331 the_target = XNEW (struct target_ops);
332 memcpy (the_target, target, sizeof (*the_target));
335 /* Convert pid to printable format. */
338 target_pid_to_str (ptid_t ptid)
342 if (ptid_equal (ptid, minus_one_ptid))
343 xsnprintf (buf, sizeof (buf), "<all threads>");
344 else if (ptid_equal (ptid, null_ptid))
345 xsnprintf (buf, sizeof (buf), "<null thread>");
346 else if (ptid_get_tid (ptid) != 0)
347 xsnprintf (buf, sizeof (buf), "Thread %d.0x%lx",
348 ptid_get_pid (ptid), ptid_get_tid (ptid));
349 else if (ptid_get_lwp (ptid) != 0)
350 xsnprintf (buf, sizeof (buf), "LWP %d.%ld",
351 ptid_get_pid (ptid), ptid_get_lwp (ptid));
353 xsnprintf (buf, sizeof (buf), "Process %d",
354 ptid_get_pid (ptid));
360 kill_inferior (int pid)
362 gdb_agent_about_to_close (pid);
364 return (*the_target->kill) (pid);
367 /* Target can do hardware single step. */
370 target_can_do_hardware_single_step (void)
375 /* Default implementation for breakpoint_kind_for_pc.
377 The default behavior for targets that don't implement breakpoint_kind_for_pc
378 is to use the size of a breakpoint as the kind. */
381 default_breakpoint_kind_from_pc (CORE_ADDR *pcptr)
385 gdb_assert (the_target->sw_breakpoint_from_kind != NULL);
387 (*the_target->sw_breakpoint_from_kind) (0, &size);
391 /* See target/target.h. */
394 target_terminal_init ()
396 /* Placeholder needed because of fork_inferior. Not necessary on
400 /* See target/target.h. */
403 target_terminal_inferior ()
405 /* Placeholder needed because of fork_inferior. Not necessary on
409 /* See target/target.h. */
412 target_terminal_ours ()
414 /* Placeholder needed because of fork_inferior. Not necessary on