Subversion Repositories HelenOS

Rev

Rev 4528 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
2128 jermar 1 
/*
2586 jermar 2 
 * Copyright (c) 2007 Pavel Jancik
3 
 * Copyright (c) 2007 Michal Kebrt
2128 jermar 4 
 * All rights reserved.
5 
 *
6 
 * Redistribution and use in source and binary forms, with or without
7 
 * modification, are permitted provided that the following conditions
8 
 * are met:
9 
 *
10 
 * - Redistributions of source code must retain the above copyright
11 
 *   notice, this list of conditions and the following disclaimer.
12 
 * - Redistributions in binary form must reproduce the above copyright
13 
 *   notice, this list of conditions and the following disclaimer in the
14 
 *   documentation and/or other materials provided with the distribution.
15 
 * - The name of the author may not be used to endorse or promote products
16 
 *   derived from this software without specific prior written permission.
17 
 *
18 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 
 */
29 
 
2465 jermar 30 
/** @addtogroup libcarm32
2128 jermar 31 
 * @{
32 
 */
33 
/** @file
34 
 */
35 
 
2586 jermar 36 
#ifndef LIBC_arm32_TLS_H_
37 
#define LIBC_arm32_TLS_H_
2128 jermar 38 
 
2586 jermar 39 
#include <sys/types.h>
2128 jermar 40 
 
2586 jermar 41 
#define CONFIG_TLS_VARIANT_1
2128 jermar 42 
 
4528 svoboda 43 
/** Offsets for accessing thread-local variables are shifted 8 bytes higher. */
2586 jermar 44 
#define ARM_TP_OFFSET  (-8)
2465 jermar 45 
 
46 
/** TCB (Thread Control Block) struct.
47 
 *
48 
 *  TLS starts just after this struct.
49 
 */
2128 jermar 50 
typedef struct {
2482 jermar 51 
    /** Fibril data. */
52 
    void *fibril_data;
2128 jermar 53 
} tcb_t;
54 
 
2465 jermar 55 
 
56 
/** Sets TLS address to the r9 register.
57 
 *
2586 jermar 58 
 *  @param tcb      TCB (TLS starts behind)
2465 jermar 59 
 */
2128 jermar 60 
static inline void __tcb_set(tcb_t *tcb)
61 
{
2468 jermar 62 
    void *tls = (void *) tcb;
2465 jermar 63 
    tls += sizeof(tcb_t) + ARM_TP_OFFSET;
64 
    asm volatile (
65 
        "mov r9, %0"
66 
        :
2586 jermar 67 
        : "r" (tls)
2465 jermar 68 
    );
2128 jermar 69 
}
70 
 
2465 jermar 71 
 
72 
/** Returns TCB address.
73 
 *
2586 jermar 74 
 * @return      TCB address (starts before TLS which address is stored
75 
 *          in r9 register).
2465 jermar 76 
 */
2128 jermar 77 
static inline tcb_t *__tcb_get(void)
78 
{
2465 jermar 79 
    void *ret;
80 
    asm volatile (
81 
        "mov %0, r9"
82 
        : "=r"(ret)
83 
    );
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.
89 
 *
90 
 *  Implemented in assembly.
91 
 *
2586 jermar 92 
 *  @return     TLS address stored in r9 register
2465 jermar 93 
 */
94 
extern uintptr_t __aeabi_read_tp(void);
95 
 
2128 jermar 96 
#endif
97 
 
98 
/** @}
99 
 */