mirror of
https://sourceware.org/git/binutils-gdb.git
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96bbe3ef96
The ptid_t 'tid' member is normally used as an address in gdb -- both bsd-uthread and ravenscar-thread use it this way. However, because the type is 'long', this can cause problems with sign extension. This patch changes the type to ULONGEST to ensure that sign extension does not occur.
858 lines
17 KiB
C++
858 lines
17 KiB
C++
/* Target operations for the remote server for GDB.
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Copyright (C) 2002-2021 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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#include "hostio.h"
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.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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int res = the_target->prepare_to_access_memory ();
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if (res != 0)
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return res;
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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->supports_thread_stopped ()
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&& target_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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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,
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target_wait_flags options, 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,
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target_wait_flags 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 ();
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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 = 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%s",
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ptid.pid (), phex_nz (ptid.tid (), sizeof (ULONGEST)));
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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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/* 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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/* Default implementations of target ops.
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See target.h for definitions. */
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void
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process_stratum_target::post_create_inferior ()
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{
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/* Nop. */
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}
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int
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process_stratum_target::prepare_to_access_memory ()
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{
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return 0;
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}
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void
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process_stratum_target::done_accessing_memory ()
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{
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/* Nop. */
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}
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void
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process_stratum_target::look_up_symbols ()
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{
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/* Nop. */
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}
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bool
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process_stratum_target::supports_read_auxv ()
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{
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return false;
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}
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int
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process_stratum_target::read_auxv (CORE_ADDR offset, unsigned char *myaddr,
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unsigned int len)
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{
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gdb_assert_not_reached ("target op read_auxv not supported");
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}
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bool
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process_stratum_target::supports_z_point_type (char z_type)
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{
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return false;
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}
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int
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process_stratum_target::insert_point (enum raw_bkpt_type type,
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CORE_ADDR addr,
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int size, raw_breakpoint *bp)
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{
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return 1;
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}
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int
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process_stratum_target::remove_point (enum raw_bkpt_type type,
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CORE_ADDR addr,
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int size, raw_breakpoint *bp)
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{
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return 1;
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}
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bool
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process_stratum_target::stopped_by_sw_breakpoint ()
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{
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return false;
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}
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bool
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process_stratum_target::supports_stopped_by_sw_breakpoint ()
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{
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return false;
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}
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bool
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process_stratum_target::stopped_by_hw_breakpoint ()
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{
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return false;
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}
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bool
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process_stratum_target::supports_stopped_by_hw_breakpoint ()
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{
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return false;
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}
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bool
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process_stratum_target::supports_hardware_single_step ()
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{
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return false;
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}
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bool
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process_stratum_target::stopped_by_watchpoint ()
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{
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return false;
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}
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CORE_ADDR
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process_stratum_target::stopped_data_address ()
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{
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return 0;
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}
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bool
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process_stratum_target::supports_read_offsets ()
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{
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return false;
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}
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bool
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process_stratum_target::supports_memory_tagging ()
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{
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return false;
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}
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bool
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process_stratum_target::fetch_memtags (CORE_ADDR address, size_t len,
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gdb::byte_vector &tags, int type)
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{
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gdb_assert_not_reached ("target op fetch_memtags not supported");
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}
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bool
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process_stratum_target::store_memtags (CORE_ADDR address, size_t len,
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const gdb::byte_vector &tags, int type)
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{
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gdb_assert_not_reached ("target op store_memtags not supported");
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}
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int
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process_stratum_target::read_offsets (CORE_ADDR *text, CORE_ADDR *data)
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{
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gdb_assert_not_reached ("target op read_offsets not supported");
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}
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bool
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process_stratum_target::supports_get_tls_address ()
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{
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return false;
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}
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int
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process_stratum_target::get_tls_address (thread_info *thread,
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CORE_ADDR offset,
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CORE_ADDR load_module,
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CORE_ADDR *address)
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{
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gdb_assert_not_reached ("target op get_tls_address not supported");
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}
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bool
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process_stratum_target::supports_qxfer_osdata ()
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{
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return false;
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}
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int
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process_stratum_target::qxfer_osdata (const char *annex,
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unsigned char *readbuf,
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unsigned const char *writebuf,
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CORE_ADDR offset, int len)
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{
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gdb_assert_not_reached ("target op qxfer_osdata not supported");
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}
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bool
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process_stratum_target::supports_qxfer_siginfo ()
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{
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return false;
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}
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int
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process_stratum_target::qxfer_siginfo (const char *annex,
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unsigned char *readbuf,
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unsigned const char *writebuf,
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CORE_ADDR offset, int len)
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{
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gdb_assert_not_reached ("target op qxfer_siginfo not supported");
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}
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bool
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process_stratum_target::supports_non_stop ()
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{
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return false;
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}
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bool
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process_stratum_target::async (bool enable)
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{
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return false;
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}
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int
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process_stratum_target::start_non_stop (bool enable)
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{
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if (enable)
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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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bool
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process_stratum_target::supports_multi_process ()
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{
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return false;
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}
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bool
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process_stratum_target::supports_fork_events ()
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{
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return false;
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}
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bool
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process_stratum_target::supports_vfork_events ()
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{
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return false;
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}
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bool
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process_stratum_target::supports_exec_events ()
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{
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return false;
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}
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void
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process_stratum_target::handle_new_gdb_connection ()
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{
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/* Nop. */
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}
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int
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process_stratum_target::handle_monitor_command (char *mon)
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{
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return 0;
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}
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int
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process_stratum_target::core_of_thread (ptid_t ptid)
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{
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|
return -1;
|
|
}
|
|
|
|
bool
|
|
process_stratum_target::supports_read_loadmap ()
|
|
{
|
|
return false;
|
|
}
|
|
|
|
int
|
|
process_stratum_target::read_loadmap (const char *annex,
|
|
CORE_ADDR offset,
|
|
unsigned char *myaddr,
|
|
unsigned int len)
|
|
{
|
|
gdb_assert_not_reached ("target op read_loadmap not supported");
|
|
}
|
|
|
|
void
|
|
process_stratum_target::process_qsupported
|
|
(gdb::array_view<const char * const> features)
|
|
{
|
|
/* Nop. */
|
|
}
|
|
|
|
bool
|
|
process_stratum_target::supports_tracepoints ()
|
|
{
|
|
return false;
|
|
}
|
|
|
|
CORE_ADDR
|
|
process_stratum_target::read_pc (regcache *regcache)
|
|
{
|
|
gdb_assert_not_reached ("process_target::read_pc: Unable to find PC");
|
|
}
|
|
|
|
void
|
|
process_stratum_target::write_pc (regcache *regcache, CORE_ADDR pc)
|
|
{
|
|
gdb_assert_not_reached ("process_target::write_pc: Unable to update PC");
|
|
}
|
|
|
|
bool
|
|
process_stratum_target::supports_thread_stopped ()
|
|
{
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
process_stratum_target::thread_stopped (thread_info *thread)
|
|
{
|
|
gdb_assert_not_reached ("target op thread_stopped not supported");
|
|
}
|
|
|
|
bool
|
|
process_stratum_target::supports_get_tib_address ()
|
|
{
|
|
return false;
|
|
}
|
|
|
|
int
|
|
process_stratum_target::get_tib_address (ptid_t ptid, CORE_ADDR *address)
|
|
{
|
|
gdb_assert_not_reached ("target op get_tib_address not supported");
|
|
}
|
|
|
|
void
|
|
process_stratum_target::pause_all (bool freeze)
|
|
{
|
|
/* Nop. */
|
|
}
|
|
|
|
void
|
|
process_stratum_target::unpause_all (bool unfreeze)
|
|
{
|
|
/* Nop. */
|
|
}
|
|
|
|
void
|
|
process_stratum_target::stabilize_threads ()
|
|
{
|
|
/* Nop. */
|
|
}
|
|
|
|
bool
|
|
process_stratum_target::supports_fast_tracepoints ()
|
|
{
|
|
return false;
|
|
}
|
|
|
|
int
|
|
process_stratum_target::install_fast_tracepoint_jump_pad
|
|
(CORE_ADDR tpoint, CORE_ADDR tpaddr, CORE_ADDR collector,
|
|
CORE_ADDR lockaddr, ULONGEST orig_size, CORE_ADDR *jump_entry,
|
|
CORE_ADDR *trampoline, ULONGEST *trampoline_size,
|
|
unsigned char *jjump_pad_insn, ULONGEST *jjump_pad_insn_size,
|
|
CORE_ADDR *adjusted_insn_addr, CORE_ADDR *adjusted_insn_addr_end,
|
|
char *err)
|
|
{
|
|
gdb_assert_not_reached ("target op install_fast_tracepoint_jump_pad "
|
|
"not supported");
|
|
}
|
|
|
|
int
|
|
process_stratum_target::get_min_fast_tracepoint_insn_len ()
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
struct emit_ops *
|
|
process_stratum_target::emit_ops ()
|
|
{
|
|
return nullptr;
|
|
}
|
|
|
|
bool
|
|
process_stratum_target::supports_disable_randomization ()
|
|
{
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
process_stratum_target::supports_qxfer_libraries_svr4 ()
|
|
{
|
|
return false;
|
|
}
|
|
|
|
int
|
|
process_stratum_target::qxfer_libraries_svr4 (const char *annex,
|
|
unsigned char *readbuf,
|
|
unsigned const char *writebuf,
|
|
CORE_ADDR offset, int len)
|
|
{
|
|
gdb_assert_not_reached ("target op qxfer_libraries_svr4 not supported");
|
|
}
|
|
|
|
bool
|
|
process_stratum_target::supports_agent ()
|
|
{
|
|
return false;
|
|
}
|
|
|
|
btrace_target_info *
|
|
process_stratum_target::enable_btrace (ptid_t ptid, const btrace_config *conf)
|
|
{
|
|
error (_("Target does not support branch tracing."));
|
|
}
|
|
|
|
int
|
|
process_stratum_target::disable_btrace (btrace_target_info *tinfo)
|
|
{
|
|
error (_("Target does not support branch tracing."));
|
|
}
|
|
|
|
int
|
|
process_stratum_target::read_btrace (btrace_target_info *tinfo,
|
|
buffer *buffer,
|
|
enum btrace_read_type type)
|
|
{
|
|
error (_("Target does not support branch tracing."));
|
|
}
|
|
|
|
int
|
|
process_stratum_target::read_btrace_conf (const btrace_target_info *tinfo,
|
|
buffer *buffer)
|
|
{
|
|
error (_("Target does not support branch tracing."));
|
|
}
|
|
|
|
bool
|
|
process_stratum_target::supports_range_stepping ()
|
|
{
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
process_stratum_target::supports_pid_to_exec_file ()
|
|
{
|
|
return false;
|
|
}
|
|
|
|
const char *
|
|
process_stratum_target::pid_to_exec_file (int pid)
|
|
{
|
|
gdb_assert_not_reached ("target op pid_to_exec_file not supported");
|
|
}
|
|
|
|
bool
|
|
process_stratum_target::supports_multifs ()
|
|
{
|
|
return false;
|
|
}
|
|
|
|
int
|
|
process_stratum_target::multifs_open (int pid, const char *filename,
|
|
int flags, mode_t mode)
|
|
{
|
|
return open (filename, flags, mode);
|
|
}
|
|
|
|
int
|
|
process_stratum_target::multifs_unlink (int pid, const char *filename)
|
|
{
|
|
return unlink (filename);
|
|
}
|
|
|
|
ssize_t
|
|
process_stratum_target::multifs_readlink (int pid, const char *filename,
|
|
char *buf, size_t bufsiz)
|
|
{
|
|
return readlink (filename, buf, bufsiz);
|
|
}
|
|
|
|
int
|
|
process_stratum_target::breakpoint_kind_from_pc (CORE_ADDR *pcptr)
|
|
{
|
|
/* The default behavior is to use the size of a breakpoint as the
|
|
kind. */
|
|
int size = 0;
|
|
sw_breakpoint_from_kind (0, &size);
|
|
return size;
|
|
}
|
|
|
|
int
|
|
process_stratum_target::breakpoint_kind_from_current_state (CORE_ADDR *pcptr)
|
|
{
|
|
return breakpoint_kind_from_pc (pcptr);
|
|
}
|
|
|
|
const char *
|
|
process_stratum_target::thread_name (ptid_t thread)
|
|
{
|
|
return nullptr;
|
|
}
|
|
|
|
bool
|
|
process_stratum_target::thread_handle (ptid_t ptid, gdb_byte **handle,
|
|
int *handle_len)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
process_stratum_target::supports_software_single_step ()
|
|
{
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
process_stratum_target::supports_catch_syscall ()
|
|
{
|
|
return false;
|
|
}
|
|
|
|
int
|
|
process_stratum_target::get_ipa_tdesc_idx ()
|
|
{
|
|
return 0;
|
|
}
|