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7adcbafe | 1 | /* Copyright (C) 2008-2022 Free Software Foundation, Inc. |
0a35513e AH |
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 | #include "libitm_i.h" | |
26 | ||
27 | namespace GTM HIDDEN { | |
28 | ||
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29 | // This function needs to be noinline because we need to prevent that it gets |
30 | // inlined into another function that calls further functions. This could | |
31 | // break our assumption that we only call memcpy and thus only need to | |
32 | // additionally protect the memcpy stack (see the hack in mask_stack_bottom()). | |
33 | // Even if that isn't an issue because those other calls don't happen during | |
34 | // copying, we still need mask_stack_bottom() to be called "close" to the | |
35 | // memcpy in terms of stack frames, so just ensure that for now using the | |
36 | // noinline. | |
37 | void __attribute__((noinline)) | |
38 | gtm_undolog::rollback (gtm_thread* tx, size_t until_size) | |
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39 | { |
40 | size_t i, n = undolog.size(); | |
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41 | void *top = mask_stack_top(tx); |
42 | void *bot = mask_stack_bottom(tx); | |
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43 | |
44 | if (n > 0) | |
45 | { | |
46 | for (i = n; i-- > until_size; ) | |
47 | { | |
11f30bb0 TR |
48 | void *ptr = (void *) undolog[i--]; |
49 | size_t len = undolog[i]; | |
50 | size_t words = (len + sizeof(gtm_word) - 1) / sizeof(gtm_word); | |
51 | i -= words; | |
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52 | // Filter out any updates that overlap the libitm stack. We don't |
53 | // bother filtering out just the overlapping bytes because we don't | |
54 | // merge writes and thus any overlapping write is either bogus or | |
55 | // would restore data on stack frames that are not in use anymore. | |
56 | // FIXME The memcpy can/will end up as another call but we | |
57 | // calculated BOT based on the current function. Can we inline or | |
58 | // reimplement this without too much trouble due to unaligned calls | |
59 | // and still have good performance, so that we can remove the hack | |
60 | // in mask_stack_bottom()? | |
61 | if (likely(ptr > top || (uint8_t*)ptr + len <= bot)) | |
62 | __builtin_memcpy (ptr, &undolog[i], len); | |
0a35513e | 63 | } |
aab74ee9 | 64 | undolog.set_size(until_size); |
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65 | } |
66 | } | |
67 | ||
68 | void ITM_REGPARM | |
69 | GTM_LB (const void *ptr, size_t len) | |
70 | { | |
71 | gtm_thread *tx = gtm_thr(); | |
11f30bb0 | 72 | tx->undolog.log(ptr, len); |
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73 | } |
74 | ||
75 | } // namespace GTM | |
76 | ||
77 | using namespace GTM; | |
78 | ||
4408b086 RH |
79 | /* ??? Use configure to determine if aliases are supported. Or convince |
80 | the compiler to not just tail call this, but actually generate the | |
81 | same_body_alias itself. */ | |
82 | void ITM_REGPARM | |
83 | _ITM_LB (const void *ptr, size_t len) | |
84 | { | |
85 | GTM_LB (ptr, len); | |
86 | } | |
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87 | |
88 | #define ITM_LOG_DEF(T) \ | |
89 | void ITM_REGPARM _ITM_L##T (const _ITM_TYPE_##T *ptr) \ | |
90 | { GTM_LB (ptr, sizeof (*ptr)); } | |
91 | ||
92 | ITM_LOG_DEF(U1) | |
93 | ITM_LOG_DEF(U2) | |
94 | ITM_LOG_DEF(U4) | |
95 | ITM_LOG_DEF(U8) | |
96 | ITM_LOG_DEF(F) | |
97 | ITM_LOG_DEF(D) | |
98 | ITM_LOG_DEF(E) | |
99 | ITM_LOG_DEF(CF) | |
100 | ITM_LOG_DEF(CD) | |
101 | ITM_LOG_DEF(CE) |