PERFORCE change 219774 for review

[Robert Watson]

http://p4web.freebsd.org/@@219774?ac=10

Change 219774 by rwatson at rwatson_zenith_cl_cam_ac_uk on 2012/11/13 22:34:24

	In a cheritest sandbox, invoke getpid() to make sure that the
	kernel's syscall blocking counter is incremented properly.

Affected files ...

.. //depot/projects/ctsrd/cheribsd/src/libexec/cheritest-helper/cheritest-helper.c#5 edit

Differences ...

==== //depot/projects/ctsrd/cheribsd/src/libexec/cheritest-helper/cheritest-helper.c#5 (text+ko) ====

@@ -58,5 +58,12 @@
 	}
 	MD5End(&md5context, buf);
 	memcpy_tocap(2, buf, 0, sizeof(buf));
+
+	/*
+	 * Invoke getpid() to trigger kernel protection features.  Should
+	 * mostly be a nop.
+	 */
+	__asm__ __volatile__ ("syscall 20");
+
 	return (123456);
 }