xscale: trace buffer remains enabled until explicitly disabled

Hi everyone,

Since a call went out for patches... been sitting on this for months.  For some
reason, the xscale trace buffer is automatically disabled as soon as a break
occurs and the trace data is collected.  This patch was a result of the
frustration of always re-enabling it, or else hitting a breakpoint and checking
the trace data, only to discover that I forgot to re-enable it before resuming.
Don't see why it should work this way.  There is no run-time penalty, AFAIK.

Along the way, I also cleaned up a little by removing the ugly practice of
recording wrap mode by setting the fill count variable to "-1", replacing it
with an enum that records the trace mode.

I've been using this for months.  Comments, criticisms gratefully received.

Mike

Signed-off-by: Mike Dunn <mikedunn@newsguy.com>

src/target/xscale.h

@@ -71,13 +71,20 @@ struct xscale_trace_data
 	struct xscale_trace_data *next;
 };
 
+enum trace_mode
+{
+   XSCALE_TRACE_DISABLED,
+   XSCALE_TRACE_FILL,
+   XSCALE_TRACE_WRAP
+};
+
 struct xscale_trace
 {
-	trace_status_t capture_status;	/* current state of capture run */
 	struct image *image;					/* source for target opcodes */
 	struct xscale_trace_data *data;		/* linked list of collected trace data */
-	int buffer_enabled;				/* whether trace buffer is enabled */
-	int buffer_fill;				/* maximum number of trace runs to read (-1 for wrap-around) */
+	int buffer_fill;				/* maximum number of trace runs to read */
+    int fill_counter;				/* running count during trace collection */
+    enum trace_mode mode;
 	enum arm_state core_state;	/* current core state (ARM, Thumb) */
 };