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/*
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 * Copyright (c) 2006 Jakub Jermar
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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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 *
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 * - 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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 * - 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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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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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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/** @addtogroup libc
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 * @{
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 */
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/** @file
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 *
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 * Support for thread-local storage, as described in:
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 *  Drepper U.: ELF Handling For Thread-Local Storage, 2005
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 *
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 * Only static model is supported.
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 */
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#include <tls.h>
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#include <malloc.h>
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#include <string.h>
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#include <align.h>
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/** Create TLS (Thread Local Storage) data structures.
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 *
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 * The code requires, that sections .tdata and .tbss are adjacent. It may be
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 * changed in the future.
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 *
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 * @return Pointer to TCB.
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 */
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tcb_t *__make_tls(void)
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{
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    void *data;
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    tcb_t *tcb;
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    size_t tls_size = &_tbss_end - &_tdata_start;
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    tcb = __alloc_tls(&data, tls_size);
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    /*
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     * Copy thread local data from the initialization image.
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     */
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    memcpy(data, &_tdata_start, &_tdata_end - &_tdata_start);
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    /*
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     * Zero out the thread local uninitialized data.
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     */
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    memset(data + (&_tbss_start - &_tdata_start), 0,
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        &_tbss_end - &_tbss_start);
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    return tcb;
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}
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void __free_tls(tcb_t *tcb)
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{
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    size_t tls_size = &_tbss_end - &_tdata_start;
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    __free_tls_arch(tcb, tls_size);
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}
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#ifdef CONFIG_TLS_VARIANT_1
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/** Allocate TLS variant 1 data structures.
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 *
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 * @param data      Start of TLS section. This is an output argument.
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 * @param size      Size of tdata + tbss section.
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 * @return      Pointer to tcb_t structure.
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 */
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tcb_t *tls_alloc_variant_1(void **data, size_t size)
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{
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    tcb_t *result;
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    result = malloc(sizeof(tcb_t) + size);
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    *data = ((void *)result) + sizeof(tcb_t);
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    return result;
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}
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/** Free TLS variant I data structures.
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 *
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 * @param tcb       Pointer to TCB structure.
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 * @param size      This argument is ignored.
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 */
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void tls_free_variant_1(tcb_t *tcb, size_t size)
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{
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    free(tcb);
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}
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#endif
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#ifdef CONFIG_TLS_VARIANT_2
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/** Allocate TLS variant II data structures.
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 *
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 * @param data      Pointer to pointer to thread local data. This is
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 *          actually an output argument.
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 * @param size      Size of thread local data.
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 * @return      Pointer to TCB structure.
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 */
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tcb_t * tls_alloc_variant_2(void **data, size_t size)
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{
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    tcb_t *tcb;
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    size = ALIGN_UP(size, &_tls_alignment);
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    *data = memalign((uintptr_t) &_tls_alignment, sizeof(tcb_t) + size);
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    tcb = (tcb_t *) (*data + size);
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    tcb->self = tcb;
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    return tcb;
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}
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/** Free TLS variant II data structures.
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 *
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 * @param tcb       Pointer to TCB structure.
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 * @param size      Size of thread local data.
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 */
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void tls_free_variant_2(tcb_t *tcb, size_t size)
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{
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    size = ALIGN_UP(size, &_tls_alignment);
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    void *start = ((void *) tcb) - size;
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    free(start);
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}
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#endif
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/** @}
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 */