Rev 2586 | 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); |
||
3488 | svoboda | 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 | */ |