1 /*
   2  * Copyright (c) 2012, 2013 SAP SE. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 /*
  26  * Header file to contain porting-relevant code which does not have a
  27  * home anywhere else.
  28  * This is intially based on hotspot/src/os/aix/vm/{loadlib,porting}_aix.{hpp,cpp}
  29  */
  30 
  31 /*
  32  * Aix' own version of dladdr().
  33  * This function tries to mimick dladdr(3) on Linux
  34  * (see http://linux.die.net/man/3/dladdr)
  35  * dladdr(3) is not POSIX but a GNU extension, and is not available on AIX.
  36  *
  37  * Differences between AIX dladdr and Linux dladdr:
  38  *
  39  * 1) Dl_info.dli_fbase: can never work, is disabled.
  40  *   A loaded image on AIX is divided in multiple segments, at least two
  41  *   (text and data) but potentially also far more. This is because the loader may
  42  *   load each member into an own segment, as for instance happens with the libC.a
  43  * 2) Dl_info.dli_sname: This only works for code symbols (functions); for data, a
  44  *   zero-length string is returned ("").
  45  * 3) Dl_info.dli_saddr: For code, this will return the entry point of the function,
  46  *   not the function descriptor.
  47  */
  48 
  49 typedef struct {
  50   const char *dli_fname; /* file path of loaded library */
  51   void *dli_fbase;       /* doesn't make sence on AIX */
  52   const char *dli_sname; /* symbol name; "" if not known */
  53   void *dli_saddr;       /* address of *entry* of function; not function descriptor; */
  54 } Dl_info;
  55 
  56 #ifdef __cplusplus
  57 extern "C"
  58 #endif
  59 int dladdr(void *addr, Dl_info *info);