Extended-remote catch exec

This patch implements exec catchpoints for extended-remote Linux
targets.  The implementation follows the same approach used for
fork catchpoints, implementing extended-remote target routines for
inserting and removing the catchpoints by just checking if exec events
are supported.  Existing host-side code and previous support for
extended-remote exec events takes care of the rest.

gdb/ChangeLog:

	* remote.c (remote_exec_event_p): New function.
	(remote_insert_exec_catchpoint): New function.
	(remote_remove_exec_catchpoint): New function.
	(init_extended_remote_ops): Initialize extended_remote_ops
	members to_insert_exec_catchpoint and
	to_remove_exec_catchpoint.

2 files changed, 41 insertions, 0 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index aa6e5b1..0110528 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,4 +1,13 @@
 2015-09-11  Don Breazeal  <donb@codesourcery.com>
+
+	* remote.c (remote_exec_event_p): New function.
+	(remote_insert_exec_catchpoint): New function.
+	(remote_remove_exec_catchpoint): New function.
+	(init_extended_remote_ops): Initialize extended_remote_ops
+	members to_insert_exec_catchpoint and
+	to_remove_exec_catchpoint.
+
+2015-09-11  Don Breazeal  <donb@codesourcery.com>
 	    Luis Machado  <lgustavo@codesourcery.com>
 
 	* infrun.c (follow_exec): Use process-style ptid for
diff --git a/gdb/remote.c b/gdb/remote.c
index 59004f9..db83e6b 100644
--- a/gdb/remote.c
+++ b/gdb/remote.c
@@ -1596,6 +1596,14 @@ remote_vfork_event_p (struct remote_state *rs)
   return packet_support (PACKET_vfork_event_feature) == PACKET_ENABLE;
 }
 
+/* Returns true if exec events are supported.  */
+
+static int
+remote_exec_event_p (struct remote_state *rs)
+{
+  return packet_support (PACKET_exec_event_feature) == PACKET_ENABLE;
+}
+
 /* Insert fork catchpoint target routine.  If fork events are enabled
    then return success, nothing more to do.  */
 
@@ -1636,6 +1644,26 @@ remote_remove_vfork_catchpoint (struct target_ops *ops, int pid)
   return 0;
 }
 
+/* Insert exec catchpoint target routine.  If exec events are
+   enabled, just return success.  */
+
+static int
+remote_insert_exec_catchpoint (struct target_ops *ops, int pid)
+{
+  struct remote_state *rs = get_remote_state ();
+
+  return !remote_exec_event_p (rs);
+}
+
+/* Remove exec catchpoint target routine.  Nothing to do, just
+   return success.  */
+
+static int
+remote_remove_exec_catchpoint (struct target_ops *ops, int pid)
+{
+  return 0;
+}
+
 /* Tokens for use by the asynchronous signal handlers for SIGINT.  */
 static struct async_signal_handler *async_sigint_remote_twice_token;
 static struct async_signal_handler *async_sigint_remote_token;
@@ -12793,6 +12821,10 @@ Specify the serial device it is connected to (e.g. /dev/ttya).";
     = remote_insert_vfork_catchpoint;
   extended_remote_ops.to_remove_vfork_catchpoint
     = remote_remove_vfork_catchpoint;
+  extended_remote_ops.to_insert_exec_catchpoint
+    = remote_insert_exec_catchpoint;
+  extended_remote_ops.to_remove_exec_catchpoint
+    = remote_remove_exec_catchpoint;
 }
 
 static int