gdb:

2012-01-23  Yao Qi  <yao@codesourcery.com>

	* remote.c (remote_use_agent): New.
	(init_remote_ops): Install `remote_use_agent'.

gdb/gdbserver:

2012-01-23  Yao Qi  <yao@codesourcery.com>

	* server.c (handle_general_set): Handle packet 'QAgent'.

gdb/doc:

2012-01-23  Yao Qi  <yao@codesourcery.com>

	* gdb.texinfo (General Query Packets): Add packet `QAgent'.
---
 gdb/doc/gdb.texinfo    |   12 ++++++++++++
 gdb/gdbserver/server.c |   26 ++++++++++++++++++++++++++
 gdb/remote.c           |   18 ++++++++++++++++++
 3 files changed, 56 insertions(+), 0 deletions(-)

diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index 49db189..c4763d4 100644
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -34486,6 +34486,10 @@ Here are the currently defined query and set packets:
 
 @table @samp
 
+@item QAgent:1
+@item QAgent:0
+Turn on or off agent as a helper.
+
 @item QAllow:@var{op}:@var{val}@dots{}
 @cindex @samp{QAllow} packet
 Specify which operations @value{GDBN} expects to request of the
@@ -35065,6 +35069,11 @@ These are the currently defined stub features and their properties:
 @tab @samp{-}
 @tab No
 
+@item @samp{QAgent}
+@tab No
+@tab @samp{-}
+@tab No
+
 @item @samp{QAllow}
 @tab No
 @tab @samp{-}
@@ -35198,6 +35207,9 @@ The remote stub accepts and implements the reverse step packet
 The remote stub understands the @samp{QTDPsrc} packet that supplies
 the source form of tracepoint definitions.
 
+@item QAgent
+The remote stub understaqnds the @samp{QAgent} packet.
+
 @item QAllow
 The remote stub understands the @samp{QAllow} packet.
 
diff --git a/gdb/gdbserver/server.c b/gdb/gdbserver/server.c
index bebccf5..a5e5bbb 100644
--- a/gdb/gdbserver/server.c
+++ b/gdb/gdbserver/server.c
@@ -424,6 +424,8 @@ write_qxfer_response (char *buf, const void *data, int len, int is_more)
 			       PBUFSIZ - 2) + 1;
 }
 
+extern int use_agent;
+
 /* Handle all of the extended 'Q' packets.  */
 
 static void
@@ -529,6 +531,30 @@ handle_general_set (char *own_buf)
       && handle_tracepoint_general_set (own_buf))
     return;
 
+  if (strncmp ("QAgent:", own_buf, strlen ("QAgent:")) == 0)
+    {
+      char *mode = own_buf + strlen ("QAgent:");
+      int req = 0;
+
+      if (strcmp (mode, "0") == 0)
+	req = 0;
+      else if (strcmp (mode, "1") == 0)
+	req = 1;
+      else
+	{
+	  /* We don't know what this value is, so complain to GDB.  */
+	  fprintf (stderr, "Unknown QAgent value requested: %s\n", own_buf);
+	  write_enn (own_buf);
+	  return;
+	}
+
+      /* Update the flag.  */
+      use_agent = req;
+      if (remote_debug)
+	fprintf (stderr, "[%s agent]\n", req ? "Enable" : "Disable");
+      write_ok (own_buf);
+    }
+
   /* Otherwise we didn't know what packet it was.  Say we didn't
      understand it.  */
   own_buf[0] = 0;
diff --git a/gdb/remote.c b/gdb/remote.c
index 60d7ecd..50bb90a 100644
--- a/gdb/remote.c
+++ b/gdb/remote.c
@@ -10581,6 +10581,23 @@ remote_set_trace_notes (char *user, char *notes, char *stop_notes)
   return 1;
 }
 
+extern int use_agent;
+
+static int
+remote_use_agent (int use)
+{
+  struct remote_state *rs = get_remote_state ();
+
+  sprintf (rs->buf, "QAgent:%d", use);
+  putpkt (rs->buf);
+  getpkt (&rs->buf, &rs->buf_size, 0);
+
+  if (strcmp (rs->buf, "OK") == 0)
+    use_agent = use;
+
+  return use_agent;
+}
+
 static void
 init_remote_ops (void)
 {
@@ -10684,6 +10701,7 @@ Specify the serial device it is connected to\n\
   remote_ops.to_static_tracepoint_markers_by_strid
     = remote_static_tracepoint_markers_by_strid;
   remote_ops.to_traceframe_info = remote_traceframe_info;
+  remote_ops.to_use_agent = remote_use_agent;
 }
 
 /* Set up the extended remote vector by making a copy of the standard
-- 
1.7.0.4