--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/os/aix/porting_aix.hpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,111 @@
+/*
+ * Copyright (c) 2012, 2015 SAP SE. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef OS_AIX_VM_PORTING_AIX_HPP
+#define OS_AIX_VM_PORTING_AIX_HPP
+
+#include <stddef.h>
+
+// Header file to contain porting-relevant code which does not have a
+// home anywhere else and which can not go into os_<platform>.h because
+// that header is included inside the os class definition, hence all
+// its content is part of the os class.
+
+// Aix' own version of dladdr().
+// This function tries to mimick dladdr(3) on Linux
+// (see http://linux.die.net/man/3/dladdr)
+// dladdr(3) is not POSIX but a GNU extension, and is not available on AIX.
+//
+// Differences between AIX dladdr and Linux dladdr:
+//
+// 1) Dl_info.dli_fbase: can never work, is disabled.
+//   A loaded image on AIX is divided in multiple segments, at least two
+//   (text and data) but potentially also far more. This is because the loader may
+//   load each member into an own segment, as for instance happens with the libC.a
+// 2) Dl_info.dli_sname: This only works for code symbols (functions); for data, a
+//   zero-length string is returned ("").
+// 3) Dl_info.dli_saddr: For code, this will return the entry point of the function,
+//   not the function descriptor.
+
+typedef struct {
+  const char *dli_fname; // file path of loaded library
+  // void *dli_fbase;
+  const char *dli_sname; // symbol name; "" if not known
+  void *dli_saddr;       // address of *entry* of function; not function descriptor;
+} Dl_info;
+
+// Note: we export this to use it inside J2se too
+#ifdef __cplusplus
+extern "C"
+#endif
+int dladdr(void *addr, Dl_info *info);
+
+struct tbtable;
+
+class AixSymbols {
+ public:
+
+  // Given a program counter, tries to locate the traceback table and returns info from
+  // it - e.g. function name, displacement of the pc inside the function, and the traceback
+  // table itself.
+  static bool get_function_name (
+    address pc,                      // [in] program counter
+    char* p_name, size_t namelen,    // [out] optional: user provided buffer for the function name
+    int* p_displacement,             // [out] optional: displacement
+    const struct tbtable** p_tb,     // [out] optional: ptr to traceback table to get further information
+    bool demangle                    // [in] whether to demangle the name
+  );
+
+  // Given a program counter, returns the name of the module (library and module) the pc points to
+  static bool get_module_name (
+    address pc,                      // [in] program counter
+    char* p_name, size_t namelen     // [out] module name
+  );
+
+};
+
+class AixNativeCallstack {
+ public:
+  // This function can be used independently from os::init();
+  static void print_callstack_for_context(outputStream* st, const ucontext_t* uc,
+                                          bool demangle,
+                                          char* buf, size_t buf_size);
+};
+
+class AixMisc {
+ public:
+  struct stackbounds_t {
+    address base; // high address (stack grows down)
+    size_t size;
+  };
+
+  // Invokes pthread_getthrds_np() and returns its values. Note: values are
+  // not aligned to stack page sizes.
+  // This function can be used independently from os::init();
+  static bool query_stack_bounds_for_current_thread(stackbounds_t* out);
+
+};
+
+#endif // OS_AIX_VM_PORTING_AIX_HPP
+