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Revision 1.9, Wed Mar 9 23:10:06 2011 UTC (10 years, 9 months ago) by joerg
Branch: MAIN
CVS Tags: yamt-pagecache-base3, yamt-pagecache-base2, yamt-pagecache-base, netbsd-6-base, netbsd-6-1-RELEASE, netbsd-6-1-RC4, netbsd-6-1-RC3, netbsd-6-1-RC2, netbsd-6-1-RC1, netbsd-6-1-5-RELEASE, netbsd-6-1-4-RELEASE, netbsd-6-1-3-RELEASE, netbsd-6-1-2-RELEASE, netbsd-6-1-1-RELEASE, netbsd-6-1, netbsd-6-0-RELEASE, netbsd-6-0-RC2, netbsd-6-0-RC1, netbsd-6-0-6-RELEASE, netbsd-6-0-5-RELEASE, netbsd-6-0-4-RELEASE, netbsd-6-0-3-RELEASE, netbsd-6-0-2-RELEASE, netbsd-6-0-1-RELEASE, netbsd-6-0, netbsd-6, matt-nb6-plus-nbase, matt-nb6-plus-base, matt-nb6-plus, cherry-xenmp-base, cherry-xenmp
Branch point for: yamt-pagecache
Changes since 1.8: +12 -2 lines

Add TLS support infrastructure. For dynamic binaries, ld.elf_so exports
_rtld_tls_allocate and _rtld_tls_free. libpthread uses this functions to
setup the thread private area of all new threads. ld.elf_so is
responsible for setting up the private area for the initial thread.
Similar functions are called from _libc_init for static binaries, using
dl_iterate_phdr to access the ELF Program Header.

Add test cases to exercise the different TLS storage models. Test cases
are compiled and installed on all platforms, but are skipped on
platforms not marked for TLS support.

This material is based upon work partially supported by
The NetBSD Foundation under a contract with Joerg Sonnenberger.

It is inspired by the TLS support in FreeBSD by Doug Rabson and the
clean ups of the DragonFly port of the original FreeBSD modifications.

/* 	$NetBSD: initfini.c,v 1.9 2011/03/09 23:10:06 joerg Exp $	 */

/*-
 * Copyright (c) 2007 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Andrew Doran.
 *
 * 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``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 FOUNDATION OR CONTRIBUTORS
 * 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>
__RCSID("$NetBSD: initfini.c,v 1.9 2011/03/09 23:10:06 joerg Exp $");

#ifdef _LIBC
#include "namespace.h"
#endif

#include <sys/param.h>
#include <sys/exec.h>
#include <sys/tls.h>
#include <stdbool.h>

void	_libc_init(void) __attribute__((__constructor__, __used__));

void	__guard_setup(void);
void	__libc_thr_init(void);
void	__libc_atomic_init(void);
void	__libc_atexit_init(void);
void	__libc_env_init(void);

#if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
__dso_hidden void	__libc_static_tls_setup(void);
#endif

static bool libc_initialised;

void _libc_init(void);

__dso_hidden void	*__auxinfo;
struct ps_strings *__ps_strings;

/*
 * _libc_init is called twice.  The first time explicitly by crt0.o
 * (for newer versions) and the second time as indirectly via _init().
 */
void
_libc_init(void)
{

	if (libc_initialised)
		return;

	libc_initialised = 1;

	if (__ps_strings != NULL)
		__auxinfo = __ps_strings->ps_argvstr +
		    __ps_strings->ps_nargvstr + __ps_strings->ps_nenvstr + 2;

	/* For -fstack-protector */
	__guard_setup();

	/* Atomic operations */
	__libc_atomic_init();

#if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
	/* Initialize TLS for statically linked programs. */
	__libc_static_tls_setup();
#endif

	/* Threads */
	__libc_thr_init();

	/* Initialize the atexit mutexes */
	__libc_atexit_init();

	/* Initialize environment memory RB tree. */
	__libc_env_init();
}