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hijackdlsym.c revision 1.2 
      1 /*      $NetBSD: hijackdlsym.c,v 1.2 2011/02/25 16:01:41 pooka Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2011 Antti Kantee.  All Rights Reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     16  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     18  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     25  * SUCH DAMAGE.
     26  */
     27 
     28 #include <sys/cdefs.h>
     29 __RCSID("$NetBSD: hijackdlsym.c,v 1.2 2011/02/25 16:01:41 pooka Exp $");
     30 
     31 #include <dlfcn.h>
     32 
     33 #include "hijack.h"
     34 
     35 /*
     36  * This is called from librumpclient in case of LD_PRELOAD.
     37  * It ensures correct RTLD_NEXT.
     38  *
     39  * (note, this module is compiled with -O0 to make sure this
     40  * function is not treated as a tailcall or other optimizations
     41  * applied)
     42  */
     43 
     44 /* why is this indirection required for powerpc ???? */
     45 static void * __noinline
     46 bouncer(void *handle, const char *symbol)
     47 {
     48 
     49 	return dlsym(handle, symbol);
     50 }
     51 
     52 void *
     53 rumphijack_dlsym(void *handle, const char *symbol)
     54 {
     55 
     56 	return bouncer(handle, symbol);
     57 }
     58