minix/lib/libc/dlfcn/dlfcn_elf.c
Ben Gras 4b999f1962 build shared versions of libraries
building defaults to off until clang is updated.

current clang does not handle -shared, necessary to change the ld
invocation to build shared libraries properly. a new clang should be
installed and MKPIC defaults to no unless the newer clang is detected.

changes:

	. mainly small imports of a Makefile or two and small fixes
	  (turning things back on that were turned off in Makefiles)
	. e.g.: dynamic librefuse now depends on dynamic
	  libpuffs, so libpuffs has to be built dynamically too
	  and a make dependency barrier is needed in lib/Makefile
	. all library objects now have a PIC (for .so) and non-PIC
	  version, so everything is built twice.
	. generate PIC versions of the compat (un-RENAMEd) jump files,
	  include function type annotation in generated assembly
	. build progs with -static by default for now
	. also build ld.elf_so
	. also import NetBSD ldd
2012-04-16 05:21:20 +02:00

138 lines
3.4 KiB
C

/* $NetBSD: dlfcn_elf.c,v 1.7 2010/10/16 10:27:07 skrll Exp $ */
/*
* Copyright (c) 2000 Takuya SHIOZAKI
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: dlfcn_elf.c,v 1.7 2010/10/16 10:27:07 skrll Exp $");
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#undef dlopen
#undef dlclose
#undef dlsym
#undef dlerror
#undef dladdr
#undef dfinfo
#define dlopen ___dlopen
#define dlclose ___dlclose
#define dlsym ___dlsym
#define dlerror ___dlerror
#define dladdr ___dladdr
#define dlinfo ___dlinfo
#define dl_iterate_phdr ___dl_iterate_phdr
#define ELFSIZE ARCH_ELFSIZE
#include "rtld.h"
#ifdef __weak_alias
__weak_alias(dlopen,___dlopen)
__weak_alias(dlclose,___dlclose)
__weak_alias(dlsym,___dlsym)
__weak_alias(dlerror,___dlerror)
__weak_alias(dladdr,___dladdr)
__weak_alias(dlinfo,___dlinfo)
__weak_alias(dl_iterate_phdr,___dl_iterate_phdr)
__weak_alias(__dlopen,___dlopen)
__weak_alias(__dlclose,___dlclose)
__weak_alias(__dlsym,___dlsym)
__weak_alias(__dlerror,___dlerror)
__weak_alias(__dladdr,___dladdr)
__weak_alias(__dlinfo,___dlinfo)
__weak_alias(__dl_iterate_phdr,___dl_iterate_phdr)
#endif
/*
* For ELF, the dynamic linker directly resolves references to its
* services to functions inside the dynamic linker itself. These
* weak-symbol stubs are necessary so that "ld" won't complain about
* undefined symbols. The stubs are executed only when the program is
* linked statically, or when a given service isn't implemented in the
* dynamic linker. They must return an error if called, and they must
* be weak symbols so that the dynamic linker can override them.
*/
static char dlfcn_error[] = "Service unavailable";
/*ARGSUSED*/
void *
dlopen(const char *name, int mode)
{
return NULL;
}
/*ARGSUSED*/
int
dlclose(void *fd)
{
return -1;
}
/*ARGSUSED*/
void *
dlsym(void *handle, const char *name)
{
return NULL;
}
/*ARGSUSED*/
__aconst char *
dlerror()
{
return dlfcn_error;
}
/*ARGSUSED*/
int
dladdr(const void *addr, Dl_info *dli)
{
return 0;
}
/*ARGSUSED*/
int
dlinfo(void *handle, int req, void *v)
{
return -1;
}
/*ARGSUSED*/
int
dl_iterate_phdr(int (*callback)(struct dl_phdr_info *, size_t, void *),
void *data)
{
return 0;
}