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| 1113 | palkovsky | 1 | /* |
| 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 | |||
| 1120 | palkovsky | 29 | /* TLS for MIPS is described in http://www.linux-mips.org/wiki/NPTL */ |
| 30 | |||
| 1113 | palkovsky | 31 | #ifndef __LIBC__mips32THREAD_H__ |
| 32 | #define __LIBC__mips32THREAD_H__ |
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| 33 | |||
| 1129 | palkovsky | 34 | /* I did not find any specification (neither MIPS nor PowerPC), but |
| 35 | * as I found it |
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| 36 | * - it uses Variant II |
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| 37 | * - TCB is at Address(First TLS Block)+0x7000. |
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| 38 | * - DTV is at Address(First TLS Block)+0x8000 |
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| 39 | * - What would happen if the TLS data was larger then 0x7000? |
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| 40 | * - The linker never accesses DTV directly, has the second definition any |
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| 41 | * sense? |
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| 42 | * We will make it this way: |
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| 43 | * - TCB is at TP-0x7000-sizeof(tcb) |
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| 44 | * - No assumption about DTV etc., but it will not have a fixed address |
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| 45 | */ |
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| 46 | #define MIPS_TP_OFFSET 0x7000 |
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| 47 | |||
| 48 | typedef struct { |
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| 49 | void *pst_data; |
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| 50 | } tcb_t; |
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| 51 | |||
| 52 | static inline void __tcb_set(tcb_t *tcb) |
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| 1113 | palkovsky | 53 | { |
| 1129 | palkovsky | 54 | void *tp = tcb; |
| 55 | tp += MIPS_TP_OFFSET + sizeof(tcb_t); |
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| 56 | |||
| 57 | __asm__ volatile ("add $27, %0, $0" : : "r"(tp)); /* Move tls to K1 */ |
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| 1113 | palkovsky | 58 | } |
| 59 | |||
| 1129 | palkovsky | 60 | static inline tcb_t * __tcb_get(void) |
| 1113 | palkovsky | 61 | { |
| 62 | void * retval; |
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| 63 | |||
| 64 | __asm__ volatile("add %0, $27, $0" : "=r"(retval)); |
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| 1129 | palkovsky | 65 | |
| 66 | return (tcb_t *)(retval - MIPS_TP_OFFSET - sizeof(tcb_t)); |
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| 1113 | palkovsky | 67 | } |
| 68 | |||
| 69 | #endif |