Add a new UMA debugging facility. This will overwrite freed memory with

0xdeadc0de and then check for it just before memory is handed off as part
of a new request.  This will catch any post free/pre alloc modification of
memory, as well as introduce errors for anything that tries to dereference
it as a pointer.

This code takes the form of special init, fini, ctor and dtor routines that
are specificly used by malloc.  It is in a seperate file because additional
debugging aids will want to live here as well.

1 files changed, 47 insertions, 0 deletions

diff --git a/sys/vm/uma_dbg.h b/sys/vm/uma_dbg.h
new file mode 100644
index 0000000..126dc57
--- /dev/null
+++ b/sys/vm/uma_dbg.h
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2002, Jeffrey Roberson <jroberson@chesapeake.net>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice unmodified, this list of conditions, and the following
+ *    disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ *
+ */
+
+/* 
+ *
+ * Jeff Roberson <jroberson@chesapeake.net>
+ *
+ * This file includes definitions, structures, prototypes, and inlines used
+ * when debugging users of the UMA interface.
+ *
+ */
+
+#ifndef VM_UMA_DBG_H
+#define VM_UMA_DBG_H
+
+void trash_ctor(void *mem, int size, void *arg);
+void trash_dtor(void *mem, int size, void *arg);
+void trash_init(void *mem, int size);
+void trash_fini(void *mem, int size);
+
+#endif /* VM_UMA_DBG_H */