1 /* Target operations for the remote server for GDB.
2 Copyright (C) 2002-2018 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;
29 client_state &cs = get_client_state ();
30 thread_info *found = find_thread_ptid (cs.general_thread);
32 current_thread = found;
33 return (current_thread != NULL);
36 /* The thread that was current before prepare_to_access_memory was
37 called. done_accessing_memory uses this to restore the previous
39 static ptid_t prev_general_thread;
44 prepare_to_access_memory (void)
46 client_state &cs = get_client_state ();
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;
55 /* Save the general thread value, since prepare_to_access_memory could change
57 prev_general_thread = cs.general_thread;
59 if (the_target->prepare_to_access_memory != NULL)
63 res = the_target->prepare_to_access_memory ();
68 for_each_thread (prev_general_thread.pid (), [&] (thread_info *thread)
70 if (mythread_alive (thread->id))
72 if (stopped == NULL && the_target->thread_stopped != NULL
73 && thread_stopped (thread))
79 if (current == NULL && prev_general_thread == thread->id)
84 /* The thread we end up choosing. */
85 struct thread_info *thread;
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. */
93 else if (current != NULL)
95 else if (first != NULL)
99 done_accessing_memory ();
103 current_thread = thread;
104 cs.general_thread = ptid_of (thread);
112 done_accessing_memory (void)
114 client_state &cs = get_client_state ();
116 if (the_target->done_accessing_memory != NULL)
117 the_target->done_accessing_memory ();
119 /* Restore the previous selected thread. */
120 cs.general_thread = prev_general_thread;
121 switch_to_thread (cs.general_thread);
125 read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len)
128 res = (*the_target->read_memory) (memaddr, myaddr, len);
129 check_mem_read (memaddr, myaddr, len);
133 /* See target/target.h. */
136 target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len)
138 return read_inferior_memory (memaddr, myaddr, len);
141 /* See target/target.h. */
144 target_read_uint32 (CORE_ADDR memaddr, uint32_t *result)
146 return read_inferior_memory (memaddr, (gdb_byte *) result, sizeof (*result));
150 write_inferior_memory (CORE_ADDR memaddr, const unsigned char *myaddr,
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. */
156 static unsigned char *buffer = 0;
162 buffer = (unsigned char *) xmalloc (len);
163 memcpy (buffer, myaddr, len);
164 check_mem_write (memaddr, buffer, myaddr, len);
165 res = (*the_target->write_memory) (memaddr, buffer, len);
172 /* See target/target.h. */
175 target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr, ssize_t len)
177 return write_inferior_memory (memaddr, myaddr, len);
181 mywait (ptid_t ptid, struct target_waitstatus *ourstatus, int options,
189 ret = target_wait (ptid, ourstatus, options);
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;
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 ())
204 if (ourstatus->kind == TARGET_WAITKIND_EXITED)
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));
219 /* See target/target.h. */
222 target_stop_and_wait (ptid_t ptid)
224 struct target_waitstatus status;
225 int was_non_stop = non_stop;
226 struct thread_resume resume_info;
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);
234 mywait (ptid, &status, 0, 0);
235 non_stop = was_non_stop;
238 /* See target/target.h. */
241 target_wait (ptid_t ptid, struct target_waitstatus *status, int options)
243 return (*the_target->wait) (ptid, status, options);
246 /* See target/target.h. */
249 target_mourn_inferior (ptid_t ptid)
251 (*the_target->mourn) (find_process_pid (ptid_get_pid (ptid)));
254 /* See target/target.h. */
257 target_continue_no_signal (ptid_t ptid)
259 struct thread_resume resume_info;
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);
267 /* See target/target.h. */
270 target_continue (ptid_t ptid, enum gdb_signal signal)
272 struct thread_resume resume_info;
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);
280 /* See target/target.h. */
283 target_supports_multi_process (void)
285 return (the_target->supports_multi_process != NULL ?
286 (*the_target->supports_multi_process) () : 0);
290 start_non_stop (int nonstop)
292 if (the_target->start_non_stop == NULL)
300 return (*the_target->start_non_stop) (nonstop);
304 set_target_ops (struct target_ops *target)
306 the_target = XNEW (struct target_ops);
307 memcpy (the_target, target, sizeof (*the_target));
310 /* Convert pid to printable format. */
313 target_pid_to_str (ptid_t ptid)
317 if (ptid_equal (ptid, minus_one_ptid))
318 xsnprintf (buf, sizeof (buf), "<all threads>");
319 else if (ptid_equal (ptid, null_ptid))
320 xsnprintf (buf, sizeof (buf), "<null thread>");
321 else if (ptid_get_tid (ptid) != 0)
322 xsnprintf (buf, sizeof (buf), "Thread %d.0x%lx",
323 ptid_get_pid (ptid), ptid_get_tid (ptid));
324 else if (ptid_get_lwp (ptid) != 0)
325 xsnprintf (buf, sizeof (buf), "LWP %d.%ld",
326 ptid_get_pid (ptid), ptid_get_lwp (ptid));
328 xsnprintf (buf, sizeof (buf), "Process %d",
329 ptid_get_pid (ptid));
335 kill_inferior (int pid)
337 gdb_agent_about_to_close (pid);
339 return (*the_target->kill) (pid);
342 /* Target can do hardware single step. */
345 target_can_do_hardware_single_step (void)
350 /* Default implementation for breakpoint_kind_for_pc.
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. */
356 default_breakpoint_kind_from_pc (CORE_ADDR *pcptr)
360 gdb_assert (the_target->sw_breakpoint_from_kind != NULL);
362 (*the_target->sw_breakpoint_from_kind) (0, &size);
368 target_terminal_state target_terminal::m_terminal_state
369 = target_terminal_state::is_ours;
371 /* See target/target.h. */
374 target_terminal::init ()
376 /* Placeholder needed because of fork_inferior. Not necessary on
380 /* See target/target.h. */
383 target_terminal::inferior ()
385 /* Placeholder needed because of fork_inferior. Not necessary on
389 /* See target/target.h. */
392 target_terminal::ours ()
394 /* Placeholder needed because of fork_inferior. Not necessary on
398 /* See target/target.h. */
401 target_terminal::ours_for_output (void)
406 /* See target/target.h. */
409 target_terminal::info (const char *arg, int from_tty)