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-rw-r--r--qemu/scripts/tracetool/backend/ftrace.py48
1 files changed, 48 insertions, 0 deletions
diff --git a/qemu/scripts/tracetool/backend/ftrace.py b/qemu/scripts/tracetool/backend/ftrace.py
new file mode 100644
index 000000000..d798c7134
--- /dev/null
+++ b/qemu/scripts/tracetool/backend/ftrace.py
@@ -0,0 +1,48 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+Ftrace built-in backend.
+"""
+
+__author__ = "Eiichi Tsukata <eiichi.tsukata.xh@hitachi.com>"
+__copyright__ = "Copyright (C) 2013 Hitachi, Ltd."
+__license__ = "GPL version 2 or (at your option) any later version"
+
+__maintainer__ = "Stefan Hajnoczi"
+__email__ = "stefanha@redhat.com"
+
+
+from tracetool import out
+
+
+PUBLIC = True
+
+
+def generate_h_begin(events):
+ out('#include "trace/ftrace.h"',
+ '#include "trace/control.h"',
+ '')
+
+
+def generate_h(event):
+ argnames = ", ".join(event.args.names())
+ if len(event.args) > 0:
+ argnames = ", " + argnames
+
+ out(' {',
+ ' char ftrace_buf[MAX_TRACE_STRLEN];',
+ ' int unused __attribute__ ((unused));',
+ ' int trlen;',
+ ' if (trace_event_get_state(%(event_id)s)) {',
+ ' trlen = snprintf(ftrace_buf, MAX_TRACE_STRLEN,',
+ ' "%(name)s " %(fmt)s "\\n" %(argnames)s);',
+ ' trlen = MIN(trlen, MAX_TRACE_STRLEN - 1);',
+ ' unused = write(trace_marker_fd, ftrace_buf, trlen);',
+ ' }',
+ ' }',
+ name=event.name,
+ args=event.args,
+ event_id="TRACE_" + event.name.upper(),
+ fmt=event.fmt.rstrip("\n"),
+ argnames=argnames)