X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2Fgdbserver%2Ftarget.c;h=a4593cf6df91c1f58951aa17b95d7ddbe0d55cbb;hb=07b76c2f0baf197ce44d66a153184d33047e7ba0;hp=9acdb8601008e6ed1161a5c9cd088173a9c3c008;hpb=6aba47ca06d9150c6196a374b745c2711b46e045;p=deliverable%2Fbinutils-gdb.git

diff --git a/gdb/gdbserver/target.c b/gdb/gdbserver/target.c
index 9acdb86010..a4593cf6df 100644
--- a/gdb/gdbserver/target.c
+++ b/gdb/gdbserver/target.c
@@ -1,5 +1,5 @@
 /* Target operations for the remote server for GDB.
-   Copyright (C) 2002, 2004, 2005, 2007 Free Software Foundation, Inc.
+   Copyright (C) 2002-2020 Free Software Foundation, Inc.
 
    Contributed by MontaVista Software.
 
@@ -7,7 +7,7 @@
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2 of the License, or
+   the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
@@ -16,45 +16,110 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 51 Franklin Street, Fifth Floor,
-   Boston, MA 02110-1301, USA.  */
+   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 ()
+{
+  client_state &cs = get_client_state ();
+  thread_info *found = find_thread_ptid (cs.general_thread);
+
+  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)
 {
-  struct thread_info *found;
+  client_state &cs = get_client_state ();
 
-  if (use_general == 1)
+  /* 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 = (struct thread_info *) find_inferior_id (&all_threads,
-						       general_thread);
+      int res;
+
+      res = the_target->prepare_to_access_memory ();
+      if (res != 0)
+	return res;
     }
+
+  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
     {
-      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 ((step_thread != 0 && step_thread != -1)
-	  && (cont_thread == 0 || cont_thread == -1))
-	found = (struct thread_info *) find_inferior_id (&all_threads,
-							 step_thread);
-
-      if (found == NULL)
-	found = (struct thread_info *) find_inferior_id (&all_threads,
-							 cont_thread);
+      done_accessing_memory ();
+      return 1;
     }
 
-  if (found == NULL)
-    current_inferior = (struct thread_info *) all_threads.head;
-  else
-    current_inferior = found;
+  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
@@ -66,38 +131,67 @@ read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len)
   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 = malloc (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);
 }
 
-unsigned char
-mywait (char *statusp, int connected_wait)
+ptid_t
+mywait (ptid_t ptid, struct target_waitstatus *ourstatus, int options,
+	int connected_wait)
 {
-  unsigned char ret;
+  ptid_t ret;
 
   if (connected_wait)
     server_waiting = 1;
 
-  ret = (*the_target->wait) (statusp);
+  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 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;
@@ -105,9 +199,197 @@ mywait (char *statusp, int connected_wait)
   return ret;
 }
 
+/* See target/target.h.  */
+
 void
-set_target_ops (struct target_ops *target)
+target_stop_and_wait (ptid_t ptid)
 {
-  the_target = (struct target_ops *) malloc (sizeof (*the_target));
+  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)
+{
+  if (the_target->start_non_stop == NULL)
+    {
+      if (nonstop)
+	return -1;
+      else
+	return 0;
+    }
+
+  return (*the_target->start_non_stop) (nonstop);
+}
+
+void
+set_target_ops (process_stratum_target *target)
+{
+  the_target = XNEW (process_stratum_target);
   memcpy (the_target, target, sizeof (*the_target));
 }
+
+/* Convert pid to printable format.  */
+
+const char *
+target_pid_to_str (ptid_t ptid)
+{
+  static char buf[80];
+
+  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
+    xsnprintf (buf, sizeof (buf), "Process %d",
+	       ptid.pid ());
+
+  return buf;
+}
+
+int
+kill_inferior (process_info *proc)
+{
+  gdb_agent_about_to_close (proc->pid);
+
+  return (*the_target->kill) (proc);
+}
+
+/* Target can do hardware single step.  */
+
+int
+target_can_do_hardware_single_step (void)
+{
+  return 1;
+}
+
+/* Default implementation for breakpoint_kind_for_pc.
+
+   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.  */
+}