| 1 | /*
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| 2 | * Copyright (c) 2006 Ondrej Palkovsky
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup libcmips32
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | * @ingroup libcmips32
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| 34 | */
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| 35 |
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| 36 | /* TLS for MIPS is described in http://www.linux-mips.org/wiki/NPTL */
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| 37 |
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| 38 | #ifndef LIBC_mips32_TLS_H_
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| 39 | #define LIBC_mips32_TLS_H_
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| 40 |
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| 41 | /*
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| 42 | * FIXME: Note that the use of variant I contradicts the observations made in
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| 43 | * the note below. Nevertheless the scheme we have used for allocating and
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| 44 | * deallocatin TLS corresponds to TLS variant I.
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| 45 | */
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| 46 | #define CONFIG_TLS_VARIANT_1
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| 47 |
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| 48 | /* I did not find any specification (neither MIPS nor PowerPC), but
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| 49 | * as I found it
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| 50 | * - it uses Variant II
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| 51 | * - TCB is at Address(First TLS Block)+0x7000.
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| 52 | * - DTV is at Address(First TLS Block)+0x8000
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| 53 | * - What would happen if the TLS data was larger then 0x7000?
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| 54 | * - The linker never accesses DTV directly, has the second definition any
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| 55 | * sense?
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| 56 | * We will make it this way:
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| 57 | * - TCB is at TP-0x7000-sizeof(tcb)
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| 58 | * - No assumption about DTV etc., but it will not have a fixed address
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| 59 | */
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| 60 | #define MIPS_TP_OFFSET 0x7000
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| 61 |
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| 62 | typedef struct {
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| 63 | void *fibril_data;
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| 64 | } tcb_t;
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| 65 |
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| 66 | static inline void __tcb_set(tcb_t *tcb)
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| 67 | {
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| 68 | void *tp = tcb;
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| 69 | tp += MIPS_TP_OFFSET + sizeof(tcb_t);
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| 70 |
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| 71 | asm volatile ("add $27, %0, $0" : : "r"(tp)); /* Move tls to K1 */
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| 72 | }
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| 73 |
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| 74 | static inline tcb_t * __tcb_get(void)
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| 75 | {
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| 76 | void * retval;
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| 77 |
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| 78 | asm volatile("add %0, $27, $0" : "=r"(retval));
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| 79 |
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| 80 | return (tcb_t *)(retval - MIPS_TP_OFFSET - sizeof(tcb_t));
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| 81 | }
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| 82 |
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| 83 | #endif
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| 84 |
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| 85 | /** @}
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| 86 | */
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