396 lines
9.1 KiB
C
396 lines
9.1 KiB
C
/* Target operations for the remote server for GDB.
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Copyright (C) 2002-2020 Free Software Foundation, Inc.
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Contributed by MontaVista Software.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "server.h"
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#include "tracepoint.h"
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#include "gdbsupport/byte-vector.h"
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process_stratum_target *the_target;
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int
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set_desired_thread ()
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{
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client_state &cs = get_client_state ();
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thread_info *found = find_thread_ptid (cs.general_thread);
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current_thread = found;
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return (current_thread != NULL);
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}
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/* The thread that was current before prepare_to_access_memory was
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called. done_accessing_memory uses this to restore the previous
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selected thread. */
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static ptid_t prev_general_thread;
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/* See target.h. */
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int
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prepare_to_access_memory (void)
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{
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client_state &cs = get_client_state ();
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/* The first thread found. */
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struct thread_info *first = NULL;
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/* The first stopped thread found. */
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struct thread_info *stopped = NULL;
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/* The current general thread, if found. */
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struct thread_info *current = NULL;
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/* Save the general thread value, since prepare_to_access_memory could change
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it. */
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prev_general_thread = cs.general_thread;
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if (the_target->prepare_to_access_memory != NULL)
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{
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int res;
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res = the_target->prepare_to_access_memory ();
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if (res != 0)
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return res;
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}
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for_each_thread (prev_general_thread.pid (), [&] (thread_info *thread)
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{
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if (mythread_alive (thread->id))
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{
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if (stopped == NULL && the_target->thread_stopped != NULL
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&& thread_stopped (thread))
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stopped = thread;
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if (first == NULL)
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first = thread;
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if (current == NULL && prev_general_thread == thread->id)
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current = thread;
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}
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});
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/* The thread we end up choosing. */
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struct thread_info *thread;
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/* Prefer a stopped thread. If none is found, try the current
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thread. Otherwise, take the first thread in the process. If
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none is found, undo the effects of
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target->prepare_to_access_memory() and return error. */
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if (stopped != NULL)
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thread = stopped;
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else if (current != NULL)
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thread = current;
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else if (first != NULL)
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thread = first;
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else
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{
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done_accessing_memory ();
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return 1;
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}
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current_thread = thread;
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cs.general_thread = ptid_of (thread);
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return 0;
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}
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/* See target.h. */
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void
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done_accessing_memory (void)
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{
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client_state &cs = get_client_state ();
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if (the_target->done_accessing_memory != NULL)
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the_target->done_accessing_memory ();
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/* Restore the previous selected thread. */
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cs.general_thread = prev_general_thread;
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switch_to_thread (the_target, cs.general_thread);
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}
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int
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read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len)
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{
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int res;
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res = (*the_target->read_memory) (memaddr, myaddr, len);
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check_mem_read (memaddr, myaddr, len);
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return res;
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}
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/* See target/target.h. */
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int
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target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len)
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{
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return read_inferior_memory (memaddr, myaddr, len);
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}
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/* See target/target.h. */
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int
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target_read_uint32 (CORE_ADDR memaddr, uint32_t *result)
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{
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return read_inferior_memory (memaddr, (gdb_byte *) result, sizeof (*result));
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}
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/* See target/target.h. */
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int
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target_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr,
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ssize_t len)
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{
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/* Make a copy of the data because check_mem_write may need to
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update it. */
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gdb::byte_vector buffer (myaddr, myaddr + len);
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check_mem_write (memaddr, buffer.data (), myaddr, len);
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return (*the_target->write_memory) (memaddr, buffer.data (), len);
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}
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ptid_t
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mywait (ptid_t ptid, struct target_waitstatus *ourstatus, int options,
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int connected_wait)
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{
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ptid_t ret;
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if (connected_wait)
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server_waiting = 1;
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ret = target_wait (ptid, ourstatus, options);
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/* We don't expose _LOADED events to gdbserver core. See the
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`dlls_changed' global. */
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if (ourstatus->kind == TARGET_WAITKIND_LOADED)
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ourstatus->kind = TARGET_WAITKIND_STOPPED;
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/* If GDB is connected through TCP/serial, then GDBserver will most
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probably be running on its own terminal/console, so it's nice to
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print there why is GDBserver exiting. If however, GDB is
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connected through stdio, then there's no need to spam the GDB
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console with this -- the user will already see the exit through
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regular GDB output, in that same terminal. */
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if (!remote_connection_is_stdio ())
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{
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if (ourstatus->kind == TARGET_WAITKIND_EXITED)
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fprintf (stderr,
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"\nChild exited with status %d\n", ourstatus->value.integer);
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else if (ourstatus->kind == TARGET_WAITKIND_SIGNALLED)
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fprintf (stderr, "\nChild terminated with signal = 0x%x (%s)\n",
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gdb_signal_to_host (ourstatus->value.sig),
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gdb_signal_to_name (ourstatus->value.sig));
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}
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if (connected_wait)
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server_waiting = 0;
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return ret;
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}
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/* See target/target.h. */
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void
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target_stop_and_wait (ptid_t ptid)
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{
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struct target_waitstatus status;
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bool was_non_stop = non_stop;
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struct thread_resume resume_info;
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resume_info.thread = ptid;
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resume_info.kind = resume_stop;
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resume_info.sig = GDB_SIGNAL_0;
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(*the_target->resume) (&resume_info, 1);
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non_stop = true;
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mywait (ptid, &status, 0, 0);
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non_stop = was_non_stop;
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}
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/* See target/target.h. */
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ptid_t
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target_wait (ptid_t ptid, struct target_waitstatus *status, int options)
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{
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return (*the_target->wait) (ptid, status, options);
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}
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/* See target/target.h. */
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void
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target_mourn_inferior (ptid_t ptid)
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{
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(*the_target->mourn) (find_process_pid (ptid.pid ()));
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}
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/* See target/target.h. */
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void
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target_continue_no_signal (ptid_t ptid)
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{
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struct thread_resume resume_info;
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resume_info.thread = ptid;
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resume_info.kind = resume_continue;
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resume_info.sig = GDB_SIGNAL_0;
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(*the_target->resume) (&resume_info, 1);
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}
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/* See target/target.h. */
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void
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target_continue (ptid_t ptid, enum gdb_signal signal)
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{
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struct thread_resume resume_info;
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resume_info.thread = ptid;
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resume_info.kind = resume_continue;
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resume_info.sig = gdb_signal_to_host (signal);
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(*the_target->resume) (&resume_info, 1);
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}
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/* See target/target.h. */
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int
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target_supports_multi_process (void)
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{
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return (the_target->supports_multi_process != NULL ?
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(*the_target->supports_multi_process) () : 0);
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}
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int
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start_non_stop (int nonstop)
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{
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if (the_target->start_non_stop == NULL)
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{
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if (nonstop)
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return -1;
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else
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return 0;
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}
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return (*the_target->start_non_stop) (nonstop);
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}
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void
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set_target_ops (process_stratum_target *target)
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{
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the_target = XNEW (process_stratum_target);
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memcpy (the_target, target, sizeof (*the_target));
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}
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/* Convert pid to printable format. */
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const char *
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target_pid_to_str (ptid_t ptid)
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{
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static char buf[80];
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if (ptid == minus_one_ptid)
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xsnprintf (buf, sizeof (buf), "<all threads>");
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else if (ptid == null_ptid)
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xsnprintf (buf, sizeof (buf), "<null thread>");
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else if (ptid.tid () != 0)
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xsnprintf (buf, sizeof (buf), "Thread %d.0x%lx",
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ptid.pid (), ptid.tid ());
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else if (ptid.lwp () != 0)
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xsnprintf (buf, sizeof (buf), "LWP %d.%ld",
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ptid.pid (), ptid.lwp ());
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else
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xsnprintf (buf, sizeof (buf), "Process %d",
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ptid.pid ());
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return buf;
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}
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int
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kill_inferior (process_info *proc)
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{
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gdb_agent_about_to_close (proc->pid);
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return (*the_target->kill) (proc);
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}
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/* Target can do hardware single step. */
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int
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target_can_do_hardware_single_step (void)
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{
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return 1;
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}
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/* Default implementation for breakpoint_kind_for_pc.
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The default behavior for targets that don't implement breakpoint_kind_for_pc
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is to use the size of a breakpoint as the kind. */
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int
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default_breakpoint_kind_from_pc (CORE_ADDR *pcptr)
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{
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int size = 0;
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gdb_assert (the_target->sw_breakpoint_from_kind != NULL);
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(*the_target->sw_breakpoint_from_kind) (0, &size);
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return size;
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}
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/* Define it. */
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target_terminal_state target_terminal::m_terminal_state
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= target_terminal_state::is_ours;
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/* See target/target.h. */
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void
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target_terminal::init ()
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{
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/* Placeholder needed because of fork_inferior. Not necessary on
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GDBserver. */
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}
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/* See target/target.h. */
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void
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target_terminal::inferior ()
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{
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/* Placeholder needed because of fork_inferior. Not necessary on
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GDBserver. */
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}
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/* See target/target.h. */
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void
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target_terminal::ours ()
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{
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/* Placeholder needed because of fork_inferior. Not necessary on
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GDBserver. */
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}
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/* See target/target.h. */
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void
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target_terminal::ours_for_output (void)
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{
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/* Placeholder. */
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}
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/* See target/target.h. */
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void
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target_terminal::info (const char *arg, int from_tty)
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{
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/* Placeholder. */
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}
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