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| Rev | Author | Line No. | Line |
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| 2128 | jermar | 1 | /* |
| 2465 | jermar | 2 | * Copyright (c) 2007 Pavel Jancik, Michal Kebrt |
| 2128 | jermar | 3 | * All rights reserved. |
| 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 | |||
| 2465 | jermar | 29 | /** @addtogroup libcarm32 |
| 2128 | jermar | 30 | * @{ |
| 31 | */ |
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| 32 | /** @file |
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| 2465 | jermar | 33 | * @brief Uspace threads and TLS. |
| 2128 | jermar | 34 | */ |
| 35 | |||
| 36 | #ifndef LIBC_arm32_THREAD_H_ |
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| 37 | #define LIBC_arm32_THREAD_H_ |
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| 38 | |||
| 39 | #include <unistd.h> |
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| 40 | |||
| 2465 | jermar | 41 | /** Stack initial size. */ |
| 2128 | jermar | 42 | #define THREAD_INITIAL_STACK_PAGES_NO 1 |
| 43 | |||
| 2465 | jermar | 44 | /** Offsets for accessing __thread variables are shifted 8 bytes higher. */ |
| 45 | #define ARM_TP_OFFSET (-8) |
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| 46 | |||
| 47 | /** TCB (Thread Control Block) struct. |
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| 48 | * |
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| 49 | * TLS starts just after this struct. |
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| 50 | */ |
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| 2128 | jermar | 51 | typedef struct { |
| 2465 | jermar | 52 | /** psthread data. */ |
| 2128 | jermar | 53 | void *pst_data; |
| 54 | } tcb_t; |
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| 55 | |||
| 2465 | jermar | 56 | |
| 57 | /** Sets TLS address to the r9 register. |
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| 58 | * |
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| 59 | * @param tcb TCB (TLS starts behind) |
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| 60 | */ |
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| 2128 | jermar | 61 | static inline void __tcb_set(tcb_t *tcb) |
| 62 | { |
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| 2468 | jermar | 63 | void *tls = (void *) tcb; |
| 2465 | jermar | 64 | tls += sizeof(tcb_t) + ARM_TP_OFFSET; |
| 65 | asm volatile ( |
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| 66 | "mov r9, %0" |
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| 67 | : |
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| 68 | : "r"(tls) |
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| 69 | ); |
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| 2128 | jermar | 70 | } |
| 71 | |||
| 2465 | jermar | 72 | |
| 73 | /** Returns TCB address. |
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| 74 | * |
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| 75 | * @return TCB address (starts before TLS which address is stored in r9 register). |
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| 76 | */ |
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| 2128 | jermar | 77 | static inline tcb_t *__tcb_get(void) |
| 78 | { |
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| 2465 | jermar | 79 | void *ret; |
| 80 | asm volatile ( |
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| 81 | "mov %0, r9" |
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| 82 | : "=r"(ret) |
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| 83 | ); |
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| 2468 | jermar | 84 | return (tcb_t *) (ret - ARM_TP_OFFSET - sizeof(tcb_t)); |
| 2128 | jermar | 85 | } |
| 86 | |||
| 2465 | jermar | 87 | |
| 88 | /** Returns TLS address stored. |
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| 89 | * |
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| 90 | * Implemented in assembly. |
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| 91 | * |
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| 92 | * @return TLS address stored in r9 register |
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| 93 | */ |
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| 94 | extern uintptr_t __aeabi_read_tp(void); |
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| 95 | |||
| 2128 | jermar | 96 | #endif |
| 97 | |||
| 98 | /** @} |
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| 99 | */ |