Subversion Repositories HelenOS

Rev

Rev 3022 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
447 decky 1 
/*
2071 jermar 2 
 * Copyright (c) 2006 Jakub Jermar
447 decky 3 
 * All rights reserved.
4 
 *
5 
 * Redistribution and use in source and binary forms, with or without
6 
 * modification, are permitted provided that the following conditions
7 
 * are met:
8 
 *
9 
 * - Redistributions of source code must retain the above copyright
10 
 *   notice, this list of conditions and the following disclaimer.
11 
 * - Redistributions in binary form must reproduce the above copyright
12 
 *   notice, this list of conditions and the following disclaimer in the
13 
 *   documentation and/or other materials provided with the distribution.
14 
 * - The name of the author may not be used to endorse or promote products
15 
 *   derived from this software without specific prior written permission.
16 
 *
17 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1653 cejka 27 
 */
28 
 
1781 jermar 29 
/** @addtogroup libc
1653 cejka 30 
 * @{
31 
 */
32 
/** @file
2586 jermar 33 
 *
34 
 * Support for thread-local storage, as described in:
35 
 *  Drepper U.: ELF Handling For Thread-Local Storage, 2005
36 
 *
37 
 * Only static model is supported.
447 decky 38 
 */
39 
 
2586 jermar 40 
#include <tls.h>
41 
#include <malloc.h>
1129 palkovsky 42 
#include <string.h>
2586 jermar 43 
#include <align.h>
447 decky 44 
 
2061 jermar 45 
/** Create TLS (Thread Local Storage) data structures.
1129 palkovsky 46 
 *
2061 jermar 47 
 * The code requires, that sections .tdata and .tbss are adjacent. It may be
48 
 * changed in the future.
49 
 *
50 
 * @return Pointer to TCB.
1129 palkovsky 51 
 */
2061 jermar 52 
tcb_t *__make_tls(void)
1113 palkovsky 53 
{
1129 palkovsky 54 
    void *data;
55 
    tcb_t *tcb;
56 
    size_t tls_size = &_tbss_end - &_tdata_start;
57 
 
58 
    tcb = __alloc_tls(&data, tls_size);
59 
 
2061 jermar 60 
    /*
61 
     * Copy thread local data from the initialization image.
62 
     */
1129 palkovsky 63 
    memcpy(data, &_tdata_start, &_tdata_end - &_tdata_start);
2061 jermar 64 
    /*
65 
     * Zero out the thread local uninitialized data.
66 
     */
2436 jermar 67 
    memset(data + (&_tbss_start - &_tdata_start), 0,
68 
        &_tbss_end - &_tbss_start);
2061 jermar 69 
 
1129 palkovsky 70 
    return tcb;
1113 palkovsky 71 
}
72 
 
1129 palkovsky 73 
void __free_tls(tcb_t *tcb)
1113 palkovsky 74 
{
1129 palkovsky 75 
    size_t tls_size = &_tbss_end - &_tdata_start;
76 
    __free_tls_arch(tcb, tls_size);
1113 palkovsky 77 
}
78 
 
2586 jermar 79 
#ifdef CONFIG_TLS_VARIANT_1
80 
/** Allocate TLS variant 1 data structures.
1081 jermar 81 
 *
2586 jermar 82 
 * @param data      Start of TLS section. This is an output argument.
83 
 * @param size      Size of tdata + tbss section.
84 
 * @return      Pointer to tcb_t structure.
1081 jermar 85 
 */
2586 jermar 86 
tcb_t *tls_alloc_variant_1(void **data, size_t size)
1079 jermar 87 
{
2586 jermar 88 
    tcb_t *result;
1113 palkovsky 89 
 
2586 jermar 90 
    result = malloc(sizeof(tcb_t) + size);
91 
    *data = ((void *)result) + sizeof(tcb_t);
92 
    return result;
1079 jermar 93 
}
1065 jermar 94 
 
2586 jermar 95 
/** Free TLS variant I data structures.
1081 jermar 96 
 *
2586 jermar 97 
 * @param tcb       Pointer to TCB structure.
98 
 * @param size      This argument is ignored.
1081 jermar 99 
 */
2586 jermar 100 
void tls_free_variant_1(tcb_t *tcb, size_t size)
1065 jermar 101 
{
2586 jermar 102 
    free(tcb);
713 decky 103 
}
2586 jermar 104 
#endif
713 decky 105 
 
2586 jermar 106 
#ifdef CONFIG_TLS_VARIANT_2
107 
/** Allocate TLS variant II data structures.
1081 jermar 108 
 *
2586 jermar 109 
 * @param data      Pointer to pointer to thread local data. This is
110 
 *          actually an output argument.
111 
 * @param size      Size of thread local data.
112 
 * @return      Pointer to TCB structure.
1081 jermar 113 
 */
2586 jermar 114 
tcb_t * tls_alloc_variant_2(void **data, size_t size)
1065 jermar 115 
{
2586 jermar 116 
    tcb_t *tcb;
117 
 
118 
    size = ALIGN_UP(size, &_tls_alignment);
4055 trochtova 119 
    *data = memalign((uintptr_t) &_tls_alignment, sizeof(tcb_t) + size);
1427 palkovsky 120 
 
2586 jermar 121 
    tcb = (tcb_t *) (*data + size);
122 
    tcb->self = tcb;
2188 decky 123 
 
2586 jermar 124 
    return tcb;
2188 decky 125 
}
126 
 
2586 jermar 127 
/** Free TLS variant II data structures.
2188 decky 128 
 *
2586 jermar 129 
 * @param tcb       Pointer to TCB structure.
130 
 * @param size      Size of thread local data.
2188 decky 131 
 */
2586 jermar 132 
void tls_free_variant_2(tcb_t *tcb, size_t size)
2188 decky 133 
{
2586 jermar 134 
    size = ALIGN_UP(size, &_tls_alignment);
135 
    void *start = ((void *) tcb) - size;
136 
    free(start);
2188 decky 137 
}
2586 jermar 138 
#endif
2188 decky 139 
 
1781 jermar 140 
/** @}
1653 cejka 141 
 */