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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 | |||
1656 | cejka | 29 | /** @addtogroup libcmips32 |
30 | * @{ |
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31 | */ |
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32 | /** @file |
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1657 | cejka | 33 | * @ingroup libcmips32eb |
1656 | cejka | 34 | */ |
35 | |||
1120 | palkovsky | 36 | /* TLS for MIPS is described in http://www.linux-mips.org/wiki/NPTL */ |
37 | |||
1113 | palkovsky | 38 | #ifndef __LIBC__mips32THREAD_H__ |
39 | #define __LIBC__mips32THREAD_H__ |
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40 | |||
1129 | palkovsky | 41 | /* I did not find any specification (neither MIPS nor PowerPC), but |
42 | * as I found it |
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43 | * - it uses Variant II |
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44 | * - TCB is at Address(First TLS Block)+0x7000. |
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45 | * - DTV is at Address(First TLS Block)+0x8000 |
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46 | * - What would happen if the TLS data was larger then 0x7000? |
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47 | * - The linker never accesses DTV directly, has the second definition any |
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48 | * sense? |
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49 | * We will make it this way: |
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50 | * - TCB is at TP-0x7000-sizeof(tcb) |
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51 | * - No assumption about DTV etc., but it will not have a fixed address |
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52 | */ |
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53 | #define MIPS_TP_OFFSET 0x7000 |
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54 | |||
55 | typedef struct { |
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56 | void *pst_data; |
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57 | } tcb_t; |
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58 | |||
59 | static inline void __tcb_set(tcb_t *tcb) |
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1113 | palkovsky | 60 | { |
1129 | palkovsky | 61 | void *tp = tcb; |
62 | tp += MIPS_TP_OFFSET + sizeof(tcb_t); |
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63 | |||
64 | __asm__ volatile ("add $27, %0, $0" : : "r"(tp)); /* Move tls to K1 */ |
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1113 | palkovsky | 65 | } |
66 | |||
1129 | palkovsky | 67 | static inline tcb_t * __tcb_get(void) |
1113 | palkovsky | 68 | { |
69 | void * retval; |
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70 | |||
71 | __asm__ volatile("add %0, $27, $0" : "=r"(retval)); |
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1129 | palkovsky | 72 | |
73 | return (tcb_t *)(retval - MIPS_TP_OFFSET - sizeof(tcb_t)); |
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1113 | palkovsky | 74 | } |
75 | |||
76 | #endif |
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1656 | cejka | 77 | |
78 | /** @} |
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79 | */ |
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80 |