/* Target operations for the remote server for GDB.
- Copyright (C) 2002, 2004, 2005, 2007, 2008, 2009, 2010
- Free Software Foundation, Inc.
+ Copyright (C) 2002-2020 Free Software Foundation, Inc.
Contributed by MontaVista Software.
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "server.h"
+#include "tracepoint.h"
+#include "gdbsupport/byte-vector.h"
-struct target_ops *the_target;
+process_stratum_target *the_target;
-void
-set_desired_inferior (int use_general)
+int
+set_desired_thread ()
{
- struct thread_info *found;
+ client_state &cs = get_client_state ();
+ thread_info *found = find_thread_ptid (cs.general_thread);
- if (use_general == 1)
- found = find_thread_ptid (general_thread);
- else
+ current_thread = found;
+ return (current_thread != NULL);
+}
+
+/* The thread that was current before prepare_to_access_memory was
+ called. done_accessing_memory uses this to restore the previous
+ selected thread. */
+static ptid_t prev_general_thread;
+
+/* See target.h. */
+
+int
+prepare_to_access_memory (void)
+{
+ client_state &cs = get_client_state ();
+
+ /* The first thread found. */
+ struct thread_info *first = NULL;
+ /* The first stopped thread found. */
+ struct thread_info *stopped = NULL;
+ /* The current general thread, if found. */
+ struct thread_info *current = NULL;
+
+ /* Save the general thread value, since prepare_to_access_memory could change
+ it. */
+ prev_general_thread = cs.general_thread;
+
+ if (the_target->prepare_to_access_memory != NULL)
{
- found = NULL;
-
- /* If we are continuing any (all) thread(s), use step_thread
- to decide which thread to step and/or send the specified
- signal to. */
- if ((!ptid_equal (step_thread, null_ptid)
- && !ptid_equal (step_thread, minus_one_ptid))
- && (ptid_equal (cont_thread, null_ptid)
- || ptid_equal (cont_thread, minus_one_ptid)))
- found = find_thread_ptid (step_thread);
-
- if (found == NULL)
- found = find_thread_ptid (cont_thread);
+ int res;
+
+ res = the_target->prepare_to_access_memory ();
+ if (res != 0)
+ return res;
}
- if (found == NULL)
- current_inferior = (struct thread_info *) all_threads.head;
+ for_each_thread (prev_general_thread.pid (), [&] (thread_info *thread)
+ {
+ if (mythread_alive (thread->id))
+ {
+ if (stopped == NULL && the_target->thread_stopped != NULL
+ && thread_stopped (thread))
+ stopped = thread;
+
+ if (first == NULL)
+ first = thread;
+
+ if (current == NULL && prev_general_thread == thread->id)
+ current = thread;
+ }
+ });
+
+ /* The thread we end up choosing. */
+ struct thread_info *thread;
+
+ /* Prefer a stopped thread. If none is found, try the current
+ thread. Otherwise, take the first thread in the process. If
+ none is found, undo the effects of
+ target->prepare_to_access_memory() and return error. */
+ if (stopped != NULL)
+ thread = stopped;
+ else if (current != NULL)
+ thread = current;
+ else if (first != NULL)
+ thread = first;
else
- current_inferior = found;
+ {
+ done_accessing_memory ();
+ return 1;
+ }
+
+ current_thread = thread;
+ cs.general_thread = ptid_of (thread);
+
+ return 0;
+}
+
+/* See target.h. */
+
+void
+done_accessing_memory (void)
+{
+ client_state &cs = get_client_state ();
+
+ if (the_target->done_accessing_memory != NULL)
+ the_target->done_accessing_memory ();
+
+ /* Restore the previous selected thread. */
+ cs.general_thread = prev_general_thread;
+ switch_to_thread (the_target, cs.general_thread);
}
int
return res;
}
+/* See target/target.h. */
+
int
-write_inferior_memory (CORE_ADDR memaddr, const unsigned char *myaddr,
- int len)
+target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len)
{
- /* Lacking cleanups, there is some potential for a memory leak if the
- write fails and we go through error(). Make sure that no more than
- one buffer is ever pending by making BUFFER static. */
- static unsigned char *buffer = 0;
- int res;
+ return read_inferior_memory (memaddr, myaddr, len);
+}
- if (buffer != NULL)
- free (buffer);
+/* See target/target.h. */
- buffer = xmalloc (len);
- memcpy (buffer, myaddr, len);
- check_mem_write (memaddr, buffer, len);
- res = (*the_target->write_memory) (memaddr, buffer, len);
- free (buffer);
- buffer = NULL;
+int
+target_read_uint32 (CORE_ADDR memaddr, uint32_t *result)
+{
+ return read_inferior_memory (memaddr, (gdb_byte *) result, sizeof (*result));
+}
- return res;
+/* See target/target.h. */
+
+int
+target_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr,
+ ssize_t len)
+{
+ /* Make a copy of the data because check_mem_write may need to
+ update it. */
+ gdb::byte_vector buffer (myaddr, myaddr + len);
+ check_mem_write (memaddr, buffer.data (), myaddr, len);
+ return (*the_target->write_memory) (memaddr, buffer.data (), len);
}
ptid_t
if (connected_wait)
server_waiting = 1;
- ret = (*the_target->wait) (ptid, ourstatus, options);
+ ret = target_wait (ptid, ourstatus, options);
+
+ /* We don't expose _LOADED events to gdbserver core. See the
+ `dlls_changed' global. */
+ if (ourstatus->kind == TARGET_WAITKIND_LOADED)
+ ourstatus->kind = TARGET_WAITKIND_STOPPED;
- if (ourstatus->kind == TARGET_WAITKIND_EXITED)
- fprintf (stderr,
- "\nChild exited with status %d\n", ourstatus->value.sig);
- else if (ourstatus->kind == TARGET_WAITKIND_SIGNALLED)
- fprintf (stderr, "\nChild terminated with signal = 0x%x (%s)\n",
- target_signal_to_host (ourstatus->value.sig),
- target_signal_to_name (ourstatus->value.sig));
+ /* If GDB is connected through TCP/serial, then GDBserver will most
+ probably be running on its own terminal/console, so it's nice to
+ print there why is GDBserver exiting. If however, GDB is
+ connected through stdio, then there's no need to spam the GDB
+ console with this -- the user will already see the exit through
+ regular GDB output, in that same terminal. */
+ if (!remote_connection_is_stdio ())
+ {
+ if (ourstatus->kind == TARGET_WAITKIND_EXITED)
+ fprintf (stderr,
+ "\nChild exited with status %d\n", ourstatus->value.integer);
+ else if (ourstatus->kind == TARGET_WAITKIND_SIGNALLED)
+ fprintf (stderr, "\nChild terminated with signal = 0x%x (%s)\n",
+ gdb_signal_to_host (ourstatus->value.sig),
+ gdb_signal_to_name (ourstatus->value.sig));
+ }
if (connected_wait)
server_waiting = 0;
return ret;
}
+/* See target/target.h. */
+
+void
+target_stop_and_wait (ptid_t ptid)
+{
+ struct target_waitstatus status;
+ bool was_non_stop = non_stop;
+ struct thread_resume resume_info;
+
+ resume_info.thread = ptid;
+ resume_info.kind = resume_stop;
+ resume_info.sig = GDB_SIGNAL_0;
+ (*the_target->resume) (&resume_info, 1);
+
+ non_stop = true;
+ mywait (ptid, &status, 0, 0);
+ non_stop = was_non_stop;
+}
+
+/* See target/target.h. */
+
+ptid_t
+target_wait (ptid_t ptid, struct target_waitstatus *status, int options)
+{
+ return (*the_target->wait) (ptid, status, options);
+}
+
+/* See target/target.h. */
+
+void
+target_mourn_inferior (ptid_t ptid)
+{
+ (*the_target->mourn) (find_process_pid (ptid.pid ()));
+}
+
+/* See target/target.h. */
+
+void
+target_continue_no_signal (ptid_t ptid)
+{
+ struct thread_resume resume_info;
+
+ resume_info.thread = ptid;
+ resume_info.kind = resume_continue;
+ resume_info.sig = GDB_SIGNAL_0;
+ (*the_target->resume) (&resume_info, 1);
+}
+
+/* See target/target.h. */
+
+void
+target_continue (ptid_t ptid, enum gdb_signal signal)
+{
+ struct thread_resume resume_info;
+
+ resume_info.thread = ptid;
+ resume_info.kind = resume_continue;
+ resume_info.sig = gdb_signal_to_host (signal);
+ (*the_target->resume) (&resume_info, 1);
+}
+
+/* See target/target.h. */
+
+int
+target_supports_multi_process (void)
+{
+ return (the_target->supports_multi_process != NULL ?
+ (*the_target->supports_multi_process) () : 0);
+}
+
int
start_non_stop (int nonstop)
{
}
void
-set_target_ops (struct target_ops *target)
+set_target_ops (process_stratum_target *target)
{
- the_target = (struct target_ops *) xmalloc (sizeof (*the_target));
+ the_target = XNEW (process_stratum_target);
memcpy (the_target, target, sizeof (*the_target));
}
{
static char buf[80];
- if (ptid_equal (ptid, minus_one_ptid))
- snprintf (buf, sizeof (buf), "<all threads>");
- else if (ptid_equal (ptid, null_ptid))
- snprintf (buf, sizeof (buf), "<null thread>");
- else if (ptid_get_tid (ptid) != 0)
- snprintf (buf, sizeof (buf), "Thread %d.0x%lx",
- ptid_get_pid (ptid), ptid_get_tid (ptid));
- else if (ptid_get_lwp (ptid) != 0)
- snprintf (buf, sizeof (buf), "LWP %d.%ld",
- ptid_get_pid (ptid), ptid_get_lwp (ptid));
+ if (ptid == minus_one_ptid)
+
xsnprintf (buf, sizeof (buf), "<all threads>");
+ else if (ptid == null_ptid)
+ xsnprintf (buf, sizeof (buf), "<null thread>");
+ else if (ptid.tid () != 0)
+ xsnprintf (buf, sizeof (buf), "Thread %d.0x%lx",
+ ptid.pid (), ptid.tid ());
+ else if (ptid.lwp () != 0)
+ xsnprintf (buf, sizeof (buf), "LWP %d.%ld",
+ ptid.pid (), ptid.lwp ());
else
- snprintf (buf, sizeof (buf), "Process %d",
- ptid_get_pid (ptid));
+ xsnprintf (buf, sizeof (buf), "Process %d",
+ ptid.pid ());
return buf;
}
-/* Return a pretty printed form of target_waitstatus. */
+int
+kill_inferior (process_info *proc)
+{
+ gdb_agent_about_to_close (proc->pid);
+
+ return (*the_target->kill) (proc);
+}
+
+/* Target can do hardware single step. */
-const char *
-target_waitstatus_to_string (const struct target_waitstatus *ws)
+int
+target_can_do_hardware_single_step (void)
{
- static char buf[200];
- const char *kind_str = "status->kind = ";
+ return 1;
+}
- switch (ws->kind)
- {
- case TARGET_WAITKIND_EXITED:
- sprintf (buf, "%sexited, status = %d",
- kind_str, ws->value.integer);
- break;
- case TARGET_WAITKIND_STOPPED:
- sprintf (buf, "%sstopped, signal = %s",
- kind_str, target_signal_to_name (ws->value.sig));
- break;
- case TARGET_WAITKIND_SIGNALLED:
- sprintf (buf, "%ssignalled, signal = %s",
- kind_str, target_signal_to_name (ws->value.sig));
- break;
- case TARGET_WAITKIND_LOADED:
- sprintf (buf, "%sloaded", kind_str);
- break;
- case TARGET_WAITKIND_EXECD:
- sprintf (buf, "%sexecd", kind_str);
- break;
- case TARGET_WAITKIND_SPURIOUS:
- sprintf (buf, "%sspurious", kind_str);
- break;
- case TARGET_WAITKIND_IGNORE:
- sprintf (buf, "%signore", kind_str);
- break;
- default:
- sprintf (buf, "%sunknown???", kind_str);
- break;
- }
+/* Default implementation for breakpoint_kind_for_pc.
- return buf;
+ The default behavior for targets that don't implement breakpoint_kind_for_pc
+ is to use the size of a breakpoint as the kind. */
+
+int
+default_breakpoint_kind_from_pc (CORE_ADDR *pcptr)
+{
+ int size = 0;
+
+ gdb_assert (the_target->sw_breakpoint_from_kind != NULL);
+
+ (*the_target->sw_breakpoint_from_kind) (0, &size);
+ return size;
+}
+
+/* Define it. */
+
+target_terminal_state target_terminal::m_terminal_state
+ = target_terminal_state::is_ours;
+
+/* See target/target.h. */
+
+void
+target_terminal::init ()
+{
+ /* Placeholder needed because of fork_inferior. Not necessary on
+ GDBserver. */
+}
+
+/* See target/target.h. */
+
+void
+target_terminal::inferior ()
+{
+ /* Placeholder needed because of fork_inferior. Not necessary on
+ GDBserver. */
+}
+
+/* See target/target.h. */
+
+void
+target_terminal::ours ()
+{
+ /* Placeholder needed because of fork_inferior. Not necessary on
+ GDBserver. */
+}
+
+/* See target/target.h. */
+
+void
+target_terminal::ours_for_output (void)
+{
+ /* Placeholder. */
+}
+
+/* See target/target.h. */
+
+void
+target_terminal::info (const char *arg, int from_tty)
+{
+ /* Placeholder. */
}
projects / deliverable / binutils-gdb.git / blobdiff