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1113 palkovsky 1 
/*
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 * Copyright (c) 2006 Ondrej Palkovsky
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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 libcmips32 
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 * @{
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 */
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/** @file
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 * @ingroup libcmips32eb   
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 */
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/* TLS for MIPS is described in http://www.linux-mips.org/wiki/NPTL */
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#ifndef LIBC_mips32_TLS_H_
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#define LIBC_mips32_TLS_H_
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/*
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 * FIXME: Note that the use of variant I contradicts the observations made in
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 * the note below. Nevertheless the scheme we have used for allocating and
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 * deallocatin TLS corresponds to TLS variant I.
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 */
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#define CONFIG_TLS_VARIANT_1
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/* I did not find any specification (neither MIPS nor PowerPC), but
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 * as I found it
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 * - it uses Variant II
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 * - TCB is at Address(First TLS Block)+0x7000.
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 * - DTV is at Address(First TLS Block)+0x8000
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 * - What would happen if the TLS data was larger then 0x7000?
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 * - The linker never accesses DTV directly, has the second definition any
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 *   sense?
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 * We will make it this way:
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 * - TCB is at TP-0x7000-sizeof(tcb)
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 * - No assumption about DTV etc., but it will not have a fixed address
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 */
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#define MIPS_TP_OFFSET 0x7000
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typedef struct {
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    void *fibril_data;
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} tcb_t;
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static inline void __tcb_set(tcb_t *tcb)
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{
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    void *tp = tcb;
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    tp += MIPS_TP_OFFSET + sizeof(tcb_t);
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    asm volatile ("add $27, %0, $0" : : "r"(tp)); /* Move tls to K1 */
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}
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static inline tcb_t * __tcb_get(void)
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{
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    void * retval;
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    asm volatile("add %0, $27, $0" : "=r"(retval));
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    return (tcb_t *)(retval - MIPS_TP_OFFSET - sizeof(tcb_t));
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}
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#endif
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/** @}
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 */