gcov: Implement code to read coverage informations

Operations are handled by a sysctl specific operation.

Implement 4 operations
- check if coverage is compiled in
- read size of coverage information
- read coverage information
- reset coverage counters

Information are stored in a single blob in a format specific to Xen designed
to make code that generate coverage as small as possible.

This patch add a public header with the structure of blob exported by Xen.
This avoid problems distributing header which is GPL2.

Signed-off-by: Frediano Ziglio <frediano.ziglio@citrix.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/xen/include/xen/gcov.h b/xen/include/xen/gcov.h
index d695919762..27c5c37a1c 100644
--- a/xen/include/xen/gcov.h
+++ b/xen/include/xen/gcov.h
@@ -14,6 +14,8 @@
 #ifndef __XEN_GCOV_H__
 #define __XEN_GCOV_H__ __XEN_GCOV_H__
 
+#include <public/sysctl.h>
+
 /*
  * Profiling data types used for gcc 3.4 and above - these are defined by
  * gcc and need to be kept as close to the original definition as possible to
@@ -81,4 +83,11 @@ struct gcov_info
 };
 
 
+/**
+ * Sysctl operations for coverage
+ */
+#ifdef TEST_COVERAGE
+int sysctl_coverage_op(xen_sysctl_coverage_op_t *op);
+#endif
+
 #endif /* __XEN_GCOV_H__ */