| 1 | /*
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| 2 | * Copyright (c) 2007 Pavel Jancik
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| 3 | * Copyright (c) 2007 Michal Kebrt
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| 4 | * All rights reserved.
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| 5 | *
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| 6 | * Redistribution and use in source and binary forms, with or without
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| 7 | * modification, are permitted provided that the following conditions
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| 8 | * are met:
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| 9 | *
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| 10 | * - Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | * - Redistributions in binary form must reproduce the above copyright
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| 13 | * notice, this list of conditions and the following disclaimer in the
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| 14 | * documentation and/or other materials provided with the distribution.
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| 15 | * - The name of the author may not be used to endorse or promote products
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| 16 | * derived from this software without specific prior written permission.
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| 17 | *
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| 18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 28 | */
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| 29 |
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| 30 | /** @addtogroup libcarm32
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| 31 | * @{
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| 32 | */
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| 33 | /** @file
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| 34 | */
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| 35 |
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| 36 | #ifndef LIBC_arm32_TLS_H_
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| 37 | #define LIBC_arm32_TLS_H_
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| 38 |
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| 39 | #include <stdint.h>
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| 40 |
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| 41 | #define CONFIG_TLS_VARIANT_1
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| 42 |
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| 43 | /** Offsets for accessing thread-local variables are shifted 8 bytes higher. */
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| 44 | #define ARM_TP_OFFSET (-8)
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| 45 |
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| 46 | /** TCB (Thread Control Block) struct.
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| 47 | *
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| 48 | * TLS starts just after this struct.
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| 49 | */
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| 50 | typedef struct {
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| 51 | /** Fibril data. */
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| 52 | void *fibril_data;
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| 53 | } tcb_t;
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| 54 |
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| 55 |
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| 56 | /** Sets TLS address to the r9 register.
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| 57 | *
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| 58 | * @param tcb TCB (TLS starts behind)
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| 59 | */
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| 60 | static inline void __tcb_set(tcb_t *tcb)
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| 61 | {
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| 62 | uint8_t *tls = (uint8_t *) tcb;
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| 63 | tls += sizeof(tcb_t) + ARM_TP_OFFSET;
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| 64 | asm volatile (
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| 65 | "mov r9, %0"
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| 66 | :
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| 67 | : "r" (tls)
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| 68 | );
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| 69 | }
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| 70 |
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| 71 |
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| 72 | /** Returns TCB address.
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| 73 | *
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| 74 | * @return TCB address (starts before TLS which address is stored
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| 75 | * in r9 register).
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| 76 | */
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| 77 | static inline tcb_t *__tcb_get(void)
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| 78 | {
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| 79 | uint8_t *ret;
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| 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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| 84 | return (tcb_t *) (ret - ARM_TP_OFFSET - sizeof(tcb_t));
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| 85 | }
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| 86 |
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| 87 |
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| 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 |
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| 96 | #endif
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| 97 |
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| 98 | /** @}
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| 99 | */
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