* Updating common/lib * Updating lib/csu * Updating lib/libc * Updating libexec/ld.elf_so * Corrected test on __minix in featuretest to actually follow the meaning of the comment. * Cleaned up _REENTRANT-related defintions. * Disabled -D_REENTRANT for libfetch * Removing some unneeded __NBSD_LIBC defines and tests Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2
205 lines
4.9 KiB
C
205 lines
4.9 KiB
C
/* $NetBSD: dlfcn_elf.c,v 1.13 2012/06/24 15:26:03 christos 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 1.13 2012/06/24 15:26:03 christos Exp $");
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include <sys/atomic.h>
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#include <assert.h>
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#include <elf.h>
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#include <errno.h>
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#include <string.h>
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#include <stdbool.h>
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#undef dlopen
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#undef dlclose
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#undef dlsym
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#undef dlerror
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#undef dladdr
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#undef dfinfo
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#define dlopen ___dlopen
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#define dlclose ___dlclose
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#define dlsym ___dlsym
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#define dlvsym ___dlvsym
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#define dlerror ___dlerror
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#define dladdr ___dladdr
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#define dlinfo ___dlinfo
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#define dl_iterate_phdr ___dl_iterate_phdr
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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(dlvsym,___dlvsym)
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__weak_alias(dlerror,___dlerror)
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__weak_alias(dladdr,___dladdr)
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__weak_alias(dlinfo,___dlinfo)
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__weak_alias(dl_iterate_phdr,___dl_iterate_phdr)
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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(__dlvsym,___dlvsym)
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__weak_alias(__dlerror,___dlerror)
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__weak_alias(__dladdr,___dladdr)
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__weak_alias(__dlinfo,___dlinfo)
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__weak_alias(__dl_iterate_phdr,___dl_iterate_phdr)
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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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void *
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dlvsym(void *handle, const char *name, const char *version)
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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(void)
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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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/*ARGSUSED*/
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int
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dlinfo(void *handle, int req, void *v)
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{
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return -1;
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}
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static const char *dlpi_name;
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static Elf_Addr dlpi_addr;
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static const Elf_Phdr *dlpi_phdr;
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static Elf_Half dlpi_phnum;
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static void
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dl_iterate_phdr_setup(void)
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{
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const AuxInfo *aux;
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_DIAGASSERT(_dlauxinfo() != NULL);
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for (aux = _dlauxinfo(); aux->a_type != AT_NULL; ++aux) {
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switch (aux->a_type) {
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case AT_BASE:
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dlpi_addr = aux->a_v;
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break;
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case AT_PHDR:
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dlpi_phdr = (void *)aux->a_v;
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break;
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case AT_PHNUM:
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_DIAGASSERT(__type_fit(Elf_Half, aux->a_v));
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dlpi_phnum = (Elf_Half)aux->a_v;
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break;
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case AT_SUN_EXECNAME:
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dlpi_name = (void *)aux->a_v;
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break;
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}
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}
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}
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/*ARGSUSED*/
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int
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dl_iterate_phdr(int (*callback)(struct dl_phdr_info *, size_t, void *),
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void *data)
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{
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static bool setup_done;
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struct dl_phdr_info phdr_info;
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if (!setup_done) {
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/*
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* This can race on the first call to dl_iterate_phdr.
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* dl_iterate_phdr_setup only touches field of pointer size
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* and smaller and such stores are atomic.
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*/
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dl_iterate_phdr_setup();
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membar_producer();
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setup_done = true;
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}
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memset(&phdr_info, 0, sizeof(phdr_info));
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phdr_info.dlpi_addr = dlpi_addr;
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phdr_info.dlpi_phdr = dlpi_phdr;
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phdr_info.dlpi_phnum = dlpi_phnum;
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phdr_info.dlpi_name = dlpi_name;
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return callback(&phdr_info, sizeof(phdr_info), data);
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}
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