add memory debug (kmalloc/kfree)

* support "memdebug" mckernel option
* check buffer overrun when memory free and next mcexec run
* check double free
* check memory leak when next mcexec run

arch/x86/kernel/include/cas.h

@@ -0,0 +1,46 @@
+/**
+ * \file arch/x86/kernel/include/cas.h
+ *  License details are found in the file LICENSE.
+ * \brief
+ *  compare and swap
+ * \author Tomoki Shirasawa  <tomoki.shirasawa.kk@hitachi-solutions.com> \par
+ *      Copyright (C) 2012 - 2013 Hitachi, Ltd.
+ */
+/*
+ * HISTORY:
+ */
+
+#ifndef __HEADER_X86_COMMON_CAS_H
+#define __HEADER_X86_COMMON_CAS_H
+// return 0:fail, 1:success
+static inline int
+compare_and_swap(void *addr, unsigned long olddata, unsigned long newdata)
+{
+	unsigned long before;
+
+	asm volatile (
+		"lock; cmpxchgq %2,%1"
+		: "=a" (before), "+m" (*(unsigned long *)addr)
+		: "q" (newdata), "0" (olddata)
+		: "cc");
+	return before == olddata;
+}
+
+#if 0 // cmpxchg16b was not support on k1om
+// return 0:fail, 1:success
+static inline int
+compare_and_swap16(void *addr, void *olddata, void *newdata)
+{
+	char rc;
+
+	asm volatile (
+		"lock; cmpxchg16b %0; setz %1"
+		: "=m" (*(long *)addr), "=q" (rc)
+		: "m" (*(long *)addr),
+		  "d" (((long *)olddata)[0]), "a" (((long *)olddata)[1]),
+		  "c" (((long *)newdata)[0]), "b" (((long *)newdata)[1])
+		: "memory");
+	return rc;
+}
+#endif
+#endif /*__HEADER_X86_COMMON_CAS_H*/