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f1717362 | 1 | /* Copyright (C) 2008-2016 Free Software Foundation, Inc. |
4c0315d0 | 2 | Contributed by Richard Henderson <rth@redhat.com>. |
3 | ||
4 | This file is part of the GNU Transactional Memory Library (libitm). | |
5 | ||
6 | Libitm is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | Libitm is distributed in the hope that it will be useful, but WITHOUT ANY | |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS | |
13 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
14 | more details. | |
15 | ||
16 | Under Section 7 of GPL version 3, you are granted additional | |
17 | permissions described in the GCC Runtime Library Exception, version | |
18 | 3.1, as published by the Free Software Foundation. | |
19 | ||
20 | You should have received a copy of the GNU General Public License and | |
21 | a copy of the GCC Runtime Library Exception along with this program; | |
22 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
23 | <http://www.gnu.org/licenses/>. */ | |
24 | ||
25 | #ifndef LIBITM_TLS_H | |
26 | #define LIBITM_TLS_H 1 | |
27 | ||
28 | namespace GTM HIDDEN { | |
29 | ||
30 | #if !defined(HAVE_ARCH_GTM_THREAD) || !defined(HAVE_ARCH_GTM_THREAD_DISP) | |
31 | // Provides a single place to store all this libraries thread-local data. | |
32 | struct gtm_thread_tls | |
33 | { | |
34 | #ifndef HAVE_ARCH_GTM_THREAD | |
35 | // The currently active transaction. Elided if the target provides | |
36 | // some efficient mechanism for storing this. | |
37 | gtm_thread *thr; | |
38 | #endif | |
39 | #ifndef HAVE_ARCH_GTM_THREAD_DISP | |
40 | // The dispatch table for the STM implementation currently in use. Elided | |
41 | // if the target provides some efficient mechanism for storing this. | |
42 | abi_dispatch *disp; | |
43 | #endif | |
44 | }; | |
45 | ||
46 | extern __thread gtm_thread_tls _gtm_thr_tls; | |
47 | #endif | |
48 | ||
49 | #ifndef HAVE_ARCH_GTM_THREAD | |
50 | // If the target does not provide optimized access to the thread-local | |
51 | // data, simply access the TLS variable defined above. | |
0e5877a5 | 52 | static inline gtm_thread *gtm_thr() { return _gtm_thr_tls.thr; } |
4c0315d0 | 53 | static inline void set_gtm_thr(gtm_thread *x) { _gtm_thr_tls.thr = x; } |
54 | #endif | |
55 | ||
56 | #ifndef HAVE_ARCH_GTM_THREAD_DISP | |
57 | // If the target does not provide optimized access to the currently | |
58 | // active dispatch table, simply access via GTM_THR. | |
59 | static inline abi_dispatch * abi_disp() { return _gtm_thr_tls.disp; } | |
60 | static inline void set_abi_disp(abi_dispatch *x) { _gtm_thr_tls.disp = x; } | |
61 | #endif | |
62 | ||
16cd8302 | 63 | #ifndef HAVE_ARCH_GTM_MASK_STACK |
64 | // To filter out any updates that overlap the libitm stack, we define | |
65 | // gtm_mask_stack_top to the entry point to the library and | |
66 | // gtm_mask_stack_bottom to below the calling function (enforced with the | |
67 | // noinline attribute). This definition should be fine for all | |
68 | // stack-grows-down architectures. | |
69 | // FIXME We fake the bottom to be lower so that we are safe even if we might | |
70 | // call further functions (compared to where we called gtm_mask_stack_bottom | |
71 | // in the call hierarchy) to actually undo or redo writes (e.g., memcpy). | |
72 | // This is a completely arbitrary value; can we instead ensure that there are | |
73 | // no such calls, or can we determine a future-proof value otherwise? | |
74 | static inline void * | |
75 | mask_stack_top(gtm_thread *tx) { return tx->jb.cfa; } | |
76 | void * __attribute__((noinline)) | |
77 | mask_stack_bottom(gtm_thread *tx); | |
78 | #endif | |
79 | ||
4c0315d0 | 80 | } // namespace GTM |
81 | ||
82 | #endif // LIBITM_TLS_H |