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9dda1f80 | 1 | /* TLS emulation. |
2 | Copyright (C) 2006 Free Software Foundation, Inc. | |
3 | Contributed by Jakub Jelinek <jakub@redhat.com>. | |
4 | ||
5 | This file is part of GCC. | |
6 | ||
7 | GCC is free software; you can redistribute it and/or modify it under | |
8 | the terms of the GNU General Public License as published by the Free | |
9 | Software Foundation; either version 2, or (at your option) any later | |
10 | version. | |
11 | ||
12 | In addition to the permissions in the GNU General Public License, the | |
13 | Free Software Foundation gives you unlimited permission to link the | |
14 | compiled version of this file into combinations with other programs, | |
15 | and to distribute those combinations without any restriction coming | |
16 | from the use of this file. (The General Public License restrictions | |
17 | do apply in other respects; for example, they cover modification of | |
18 | the file, and distribution when not linked into a combine | |
19 | executable.) | |
20 | ||
21 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
22 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
23 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
24 | for more details. | |
25 | ||
26 | You should have received a copy of the GNU General Public License | |
27 | along with GCC; see the file COPYING. If not, write to the Free | |
28 | Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA | |
29 | 02110-1301, USA. */ | |
30 | ||
31 | #include "tconfig.h" | |
32 | #include "tsystem.h" | |
33 | #include "coretypes.h" | |
34 | #include "tm.h" | |
35 | #include "gthr.h" | |
36 | ||
37 | typedef unsigned int word __attribute__((mode(word))); | |
38 | typedef unsigned int pointer __attribute__((mode(pointer))); | |
39 | ||
40 | struct __emutls_object | |
41 | { | |
42 | word size; | |
43 | word align; | |
44 | union { | |
45 | pointer offset; | |
46 | void *ptr; | |
47 | } loc; | |
48 | void *templ; | |
49 | }; | |
50 | ||
bedbe58b | 51 | struct __emutls_array |
52 | { | |
53 | pointer size; | |
54 | void **data[]; | |
55 | }; | |
56 | ||
9dda1f80 | 57 | #ifdef __GTHREADS |
58 | #ifdef __GTHREAD_MUTEX_INIT | |
59 | static __gthread_mutex_t emutls_mutex = __GTHREAD_MUTEX_INIT; | |
60 | #else | |
61 | static __gthread_mutex_t emutls_mutex; | |
62 | #endif | |
63 | static __gthread_key_t emutls_key; | |
64 | static pointer emutls_size; | |
65 | ||
66 | static void | |
67 | emutls_destroy (void *ptr) | |
68 | { | |
bedbe58b | 69 | struct __emutls_array *arr = ptr; |
70 | pointer size = arr->size; | |
71 | pointer i; | |
72 | ||
73 | for (i = 0; i < size; ++i) | |
9dda1f80 | 74 | { |
bedbe58b | 75 | if (arr->data[i]) |
76 | free (arr->data[i][-1]); | |
9dda1f80 | 77 | } |
bedbe58b | 78 | |
9dda1f80 | 79 | free (ptr); |
80 | } | |
81 | ||
82 | static void | |
83 | emutls_init (void) | |
84 | { | |
85 | #ifndef __GTHREAD_MUTEX_INIT | |
86 | __GTHREAD_MUTEX_INIT_FUNCTION (&emutls_mutex); | |
87 | #endif | |
88 | if (__gthread_key_create (&emutls_key, emutls_destroy) != 0) | |
89 | abort (); | |
90 | } | |
91 | #endif | |
92 | ||
93 | static void * | |
94 | emutls_alloc (struct __emutls_object *obj) | |
95 | { | |
96 | void *ptr; | |
97 | void *ret; | |
98 | ||
99 | /* We could use here posix_memalign if available and adjust | |
100 | emutls_destroy accordingly. */ | |
101 | if (obj->align <= sizeof (void *)) | |
102 | { | |
103 | ptr = malloc (obj->size + sizeof (void *)); | |
104 | if (ptr == NULL) | |
105 | abort (); | |
106 | ((void **) ptr)[0] = ptr; | |
107 | ret = ptr + sizeof (void *); | |
108 | } | |
109 | else | |
110 | { | |
111 | ptr = malloc (obj->size + sizeof (void *) + obj->align - 1); | |
112 | if (ptr == NULL) | |
113 | abort (); | |
114 | ret = (void *) (((pointer) (ptr + sizeof (void *) + obj->align - 1)) | |
115 | & ~(pointer)(obj->align - 1)); | |
116 | ((void **) ret)[-1] = ptr; | |
117 | } | |
118 | ||
119 | if (obj->templ) | |
120 | memcpy (ret, obj->templ, obj->size); | |
121 | else | |
122 | memset (ret, 0, obj->size); | |
123 | ||
124 | return ret; | |
125 | } | |
126 | ||
127 | void * | |
128 | __emutls_get_address (struct __emutls_object *obj) | |
129 | { | |
130 | if (! __gthread_active_p ()) | |
131 | { | |
132 | if (__builtin_expect (obj->loc.ptr == NULL, 0)) | |
133 | obj->loc.ptr = emutls_alloc (obj); | |
134 | return obj->loc.ptr; | |
135 | } | |
136 | ||
137 | #ifndef __GTHREADS | |
138 | abort (); | |
139 | #else | |
bedbe58b | 140 | pointer offset = obj->loc.offset; |
9dda1f80 | 141 | |
bedbe58b | 142 | if (__builtin_expect (offset == 0, 0)) |
9dda1f80 | 143 | { |
144 | static __gthread_once_t once = __GTHREAD_ONCE_INIT; | |
145 | __gthread_once (&once, emutls_init); | |
146 | __gthread_mutex_lock (&emutls_mutex); | |
147 | offset = ++emutls_size; | |
148 | obj->loc.offset = offset; | |
149 | __gthread_mutex_unlock (&emutls_mutex); | |
150 | } | |
9dda1f80 | 151 | |
bedbe58b | 152 | struct __emutls_array *arr = __gthread_getspecific (emutls_key); |
9dda1f80 | 153 | if (__builtin_expect (arr == NULL, 0)) |
154 | { | |
155 | pointer size = offset + 32; | |
156 | arr = calloc (size, sizeof (void *)); | |
157 | if (arr == NULL) | |
158 | abort (); | |
bedbe58b | 159 | arr->size = size; |
9dda1f80 | 160 | __gthread_setspecific (emutls_key, (void *) arr); |
161 | } | |
bedbe58b | 162 | else if (__builtin_expect (offset >= arr->size, 0)) |
9dda1f80 | 163 | { |
bedbe58b | 164 | pointer orig_size = arr->size; |
9dda1f80 | 165 | pointer size = orig_size * 2; |
166 | if (offset >= size) | |
167 | size = offset + 32; | |
168 | arr = realloc (arr, size * sizeof (void *)); | |
169 | if (arr == NULL) | |
170 | abort (); | |
bedbe58b | 171 | arr->size = size; |
172 | memset (arr->data + orig_size - 1, 0, | |
173 | (size - orig_size) * sizeof (void *)); | |
9dda1f80 | 174 | __gthread_setspecific (emutls_key, (void *) arr); |
175 | } | |
176 | ||
bedbe58b | 177 | void *ret = arr->data[offset - 1]; |
9dda1f80 | 178 | if (__builtin_expect (ret == NULL, 0)) |
179 | { | |
180 | ret = emutls_alloc (obj); | |
bedbe58b | 181 | arr->data[offset - 1] = ret; |
9dda1f80 | 182 | } |
183 | return ret; | |
184 | #endif | |
185 | } | |
186 | ||
187 | void | |
188 | __emutls_register_common (struct __emutls_object *obj, | |
189 | word size, word align, void *templ) | |
190 | { | |
191 | if (obj->size < size) | |
192 | { | |
193 | obj->size = size; | |
194 | obj->templ = NULL; | |
195 | } | |
196 | if (obj->align < align) | |
197 | obj->align = align; | |
198 | if (templ && size == obj->size) | |
199 | obj->templ = templ; | |
200 | } |