d900731978
Previously dlsym resolved to the version in crt0.o or libc which would mean that the caller's shared object couldn't be determined correctly using __builtin_return_address(0). Mainly from FreeBSD, but adapted by me. Benefits of this solutions are: - backward comptibility maintained - existing broken binaries are fixed with a new ld.elf_so - __mainprog_obj can be removed from crt0.o - we do the same thing as FreeBSD Fixes PR 22067. OKed by Jason and Christos.
97 lines
2.6 KiB
C
97 lines
2.6 KiB
C
/* $NetBSD: dlfcn_elf.c,v 1.4 2003/08/12 09:18:43 skrll Exp $ */
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/*
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* Copyright (c) 2000 Takuya SHIOZAKI
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: dlfcn_elf.c,v 1.4 2003/08/12 09:18:43 skrll Exp $");
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#define ELFSIZE ARCH_ELFSIZE
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#include "rtld.h"
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#ifdef __weak_alias
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__weak_alias(dlopen,__dlopen)
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__weak_alias(dlclose,__dlclose)
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__weak_alias(dlsym,__dlsym)
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__weak_alias(dlerror,__dlerror)
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__weak_alias(dladdr,__dladdr)
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#endif
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/*
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* For ELF, the dynamic linker directly resolves references to its
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* services to functions inside the dynamic linker itself. These
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* weak-symbol stubs are necessary so that "ld" won't complain about
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* undefined symbols. The stubs are executed only when the program is
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* linked statically, or when a given service isn't implemented in the
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* dynamic linker. They must return an error if called, and they must
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* be weak symbols so that the dynamic linker can override them.
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*/
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static char dlfcn_error[] = "Service unavailable";
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/*ARGSUSED*/
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void *
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dlopen(const char *name, int mode)
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{
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return NULL;
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}
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/*ARGSUSED*/
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int
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dlclose(void *fd)
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{
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return -1;
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}
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/*ARGSUSED*/
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void *
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dlsym(void *handle, const char *name)
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{
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return NULL;
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}
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/*ARGSUSED*/
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__aconst char *
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dlerror()
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{
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return dlfcn_error;
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}
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/*ARGSUSED*/
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int
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dladdr(const void *addr, Dl_info *dli)
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{
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return 0;
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}
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