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, 6 insertions, 0 deletions

diff --git a/xen/common/sysctl.c b/xen/common/sysctl.c
index b8d2c736f7..31f9650ecc 100644
--- a/xen/common/sysctl.c
+++ b/xen/common/sysctl.c
@@ -26,6 +26,7 @@
 #include <xen/nodemask.h>
 #include <xsm/xsm.h>
 #include <xen/pmstat.h>
+#include <xen/gcov.h>
 
 long do_sysctl(XEN_GUEST_HANDLE_PARAM(xen_sysctl_t) u_sysctl)
 {
@@ -357,6 +358,11 @@ long do_sysctl(XEN_GUEST_HANDLE_PARAM(xen_sysctl_t) u_sysctl)
     }
     break;
 
+#ifdef TEST_COVERAGE
+    case XEN_SYSCTL_coverage_op:
+        ret = sysctl_coverage_op(&op->u.coverage_op);
+        break;
+#endif
 
     default:
         ret = arch_do_sysctl(op, u_sysctl);