aad599979d
_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.
100 lines
2.9 KiB
C
100 lines
2.9 KiB
C
/* $NetBSD: initfini.c,v 1.9 2011/03/09 23:10:06 joerg Exp $ */
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/*-
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* Copyright (c) 2007 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Andrew Doran.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: initfini.c,v 1.9 2011/03/09 23:10:06 joerg Exp $");
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#ifdef _LIBC
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#include "namespace.h"
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#endif
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#include <sys/param.h>
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#include <sys/exec.h>
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#include <sys/tls.h>
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#include <stdbool.h>
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void _libc_init(void) __attribute__((__constructor__, __used__));
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void __guard_setup(void);
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void __libc_thr_init(void);
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void __libc_atomic_init(void);
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void __libc_atexit_init(void);
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void __libc_env_init(void);
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#if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
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__dso_hidden void __libc_static_tls_setup(void);
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#endif
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static bool libc_initialised;
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void _libc_init(void);
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__dso_hidden void *__auxinfo;
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struct ps_strings *__ps_strings;
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/*
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* _libc_init is called twice. The first time explicitly by crt0.o
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* (for newer versions) and the second time as indirectly via _init().
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*/
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void
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_libc_init(void)
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{
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if (libc_initialised)
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return;
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libc_initialised = 1;
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if (__ps_strings != NULL)
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__auxinfo = __ps_strings->ps_argvstr +
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__ps_strings->ps_nargvstr + __ps_strings->ps_nenvstr + 2;
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/* For -fstack-protector */
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__guard_setup();
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/* Atomic operations */
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__libc_atomic_init();
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#if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
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/* Initialize TLS for statically linked programs. */
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__libc_static_tls_setup();
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#endif
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/* Threads */
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__libc_thr_init();
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/* Initialize the atexit mutexes */
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__libc_atexit_init();
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/* Initialize environment memory RB tree. */
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__libc_env_init();
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}
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