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70 lines
2.9 KiB
C
70 lines
2.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2004 Doug Rabson
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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 AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Semi-public interface from thread libraries to rtld for managing
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* TLS.
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*/
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#ifndef _RTLD_TLS_H_
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#define _RTLD_TLS_H_
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/*
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* Allocate a TLS block for a new thread. The memory allocated will
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* include 'tcbsize' bytes aligned to a 'tcbalign' boundary (in bytes)
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* for the thread library's private purposes. The location of the TCB
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* block is returned by this function. For architectures using
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* 'Variant I' TLS, the thread local storage follows the TCB, and for
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* 'Variant II', the thread local storage precedes it. For
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* architectures using the 'Variant II' model (e.g. i386, amd64) the
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* TCB must begin with two pointer fields which are used by rtld for
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* its TLS implementation. For the 'Variant I' model, the TCB must
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* begin with a single pointer field for rtld's implementation.
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*
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* If the value of 'oldtls' is non-NULL, the new TLS block will be
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* initialised using the values contained in 'oldtls' and 'oldtls'
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* will be freed. This is typically used when initialising a thread
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* library to migrate from using the initial bootstrap TLS block
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* created by rtld to one which contains suitable thread library
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* private data.
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*
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* The value returned from this function is suitable for installing
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* directly into the thread pointer register.
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*/
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void *_rtld_allocate_tls(void *oldtls, size_t tcbsize, size_t tcbalign)
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__exported;
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/*
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* Free a TLS block allocated using _rtld_allocate_tls(). The tcbsize
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* and tcbalign parameters must be the same as those used to allocate
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* the block.
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*/
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void _rtld_free_tls(void *tcb, size_t tcbsize, size_t tcbalign) __exported;
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#endif
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