Initial s390-tools-2.0.0 import

This commit is based on the s390-tools-1.39.0 version.

Changes on top of s390-tools-1.39.0:

 - Add MIT license to all source files
 - Add LICENSE file
 - Transform REAMDE to README.md (markdown)
 - Add AUTHORS.md file
 - Add CONTRIBUTING.md file
 - Move changelog from README to CHANGELOG.md file

Reviewed-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>

include/lib/util_panic.h

@@ -0,0 +1,44 @@
+/**
+ * @defgroup util_panic_h util_panic: Panic interface
+ * @{
+ * @brief Collect FFDC data for unexpected errors
+ *
+ * Copyright IBM Corp. 2016, 2017
+ *
+ * s390-tools is free software; you can redistribute it and/or modify
+ * it under the terms of the MIT license. See LICENSE for details.
+ */
+
+#ifndef LIB_UTIL_PANIC_H
+#define LIB_UTIL_PANIC_H
+
+#include "zt_common.h"
+
+/**
+ * Write message, print backtrace and then call the abort() function
+ *
+ * @param[in] ...     Format string and parameters describing the panic reason
+ */
+#define util_panic(...) \
+	__util_panic(__func__, __FILE__, __LINE__, ##__VA_ARGS__)
+
+void __noreturn __util_panic(const char *func, const char *file, int line,
+		  const char *fmt, ...);
+
+/**
+ * Ensure that assumption is not true, otherwise panic
+ *
+ * Example: util_assert(ptr == NULL, "The ptr must be NULL, but is %p", ptr)
+ *
+ * @param[in] assumption  This assumption has to be true
+ * @param[in] ...         Format string and parameters describing the assumption
+ */
+#define util_assert(assumption, ...) \
+	__util_assert(#assumption, __func__, __FILE__, __LINE__, \
+		      assumption, ##__VA_ARGS__)
+
+void __util_assert(const char *assertion_string,
+		   const char *func, const char *file, int line,
+		   int assumption, const char *fmt, ...);
+
+#endif /** LIB_UTIL_PANIC_H @} */