Support disconnected tracing.

	* infcmd.c (detach_command): Ask whether to stop tracing.
	* cli/cli-cmds.c (quit_command): Ditto.
	* breakpoint.h (struct breakpoint): New field number_on_target.
	* breakpoint.c (create_tracepoint_from_upload): New function.
	(get_tracepoint_by_number_on_target): New function.
	* remote.c (struct remote): New field disconnected_tracing.
	(remote_disconnected_tracing_feature): New function.
	(remote_protocol_features): Add DisconnectedTracing.
	(struct uploaded_tp): New struct.
	(uploaded_tps): New global.
	(get_uploaded_tp): New function.
	(find_matching_tracepoint): New function.
	(remote_get_tracing_state): New function.
	(remote_start_remote): Call it.
	* tracepoint.c (disconnected_tracing): New global.
	(trace_start_command): Initialize number_on_target.
	(stop_tracing): New function, split out from...
	(trace_stop_command): Call stop_tracing.
	(get_trace_status): New function, split out from...
	(trace_status_command): Call get_trace_status, add info on
	disconnection behavior.
	(disconnect_or_stop_tracing): New function.
	(finish_tfind_command): Translate from number on target.
	(trace_find_tracepoint_command): Translate to number on target.
	(send_disconnected_tracing_value): New function.
	(set_disconnected_tracing): New function.
	(_initialize_tracepoint): Add disconnected-tracing variable.
	* NEWS: Mention disconnected tracing.

	* gdb.texinfo (Starting and Stopping Trace Experiments): Document
	disconnected tracing.
	(Tracepoint Packets): Document new protocol.

1 files changed, 26 insertions, 2 deletions

diff --git a/gdb/NEWS b/gdb/NEWS
index 544a1aa..1f322b3 100644
--- a/gdb/NEWS
+++ b/gdb/NEWS
@@ -24,7 +24,11 @@ Renesas RX			rx
   lists inferiors that are not running yet or that have exited
   already.  See also "New commands" and "New options" below.
 
-* Trace state variables
+* New tracing features
+
+  GDB's tracepoint facility now includes several new features:
+
+  ** Trace state variables
 
   GDB tracepoints now include support for trace state variables, which
   are variables managed by the target agent during a tracing
@@ -37,7 +41,7 @@ Renesas RX			rx
   command to create, and "info tvariables" to view; see "Trace State
   Variables" in the manual for more detail.
 
-* Fast tracepoints
+  ** Fast tracepoints
 
   GDB now includes an option for defining fast tracepoints, which
   targets may implement more efficiently, such as by installing a jump
@@ -49,6 +53,14 @@ Renesas RX			rx
   fast tracepoint, use the "ftrace" command, with syntax identical to
   the regular trace command.
 
+  ** Disconnected tracing
+
+  It is now possible to detach GDB from the target while it is running
+  a trace experiment, then reconnect later to see how the experiment
+  is going.  In addition, a new variable disconnected-tracing lets you
+  tell the target agent whether to continue running a trace if the
+  connection is lost unexpectedly.
+
 * Changed commands
 
 disassemble
@@ -130,6 +142,12 @@ show default-collect
    This is a useful way to ensure essential items are not overlooked,
    such as registers or a critical global variable.
 
+set disconnected-tracing
+show disconnected-tracing
+   If set to 1, the target is instructed to continue tracing if it
+   loses its connection to GDB.  If 0, the target is to stop tracing
+   upon disconnection.
+
 * New remote packets
 
 QTDV
@@ -138,6 +156,12 @@ QTDV
 qTV
    Get the current value of a trace state variable.
 
+QTDisconnected
+   Set desired tracing behavior upon disconnection.
+
+qTfP, qTsP
+   Get data about the tracepoints currently in use.
+
 * Bug fixes
 
 Process record now works correctly with hardware watchpoints.