| 1 | /* Data for vDSO support. Linux version. |
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| 2 | Copyright (C) 2020-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | /* This file is included in three different modes for both static (libc.a) |
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| 20 | and shared (rtld) modes: |
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| 21 | |
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| 22 | 1. PROCINFO_DECL is defined, meaning we are only interested in |
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| 23 | declarations. For static it requires use the extern keywork along with |
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| 24 | the attribute_relro while for shared it will be embedded in the |
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| 25 | rtld_global_ro. |
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| 26 | |
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| 27 | 2. PROCINFO_DECL and SHARED are not defined. Nothing to do, the default |
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| 28 | zero initializion is suffice. |
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| 29 | |
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| 30 | 3. PROCINFO_DECL is not defined while SHARED is. Similar to 2., the zero |
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| 31 | initialization of rtld_global_ro is suffice. */ |
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| 32 | |
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| 33 | #ifndef PROCINFO_CLASS |
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| 34 | # define PROCINFO_CLASS |
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| 35 | #endif |
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| 36 | |
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| 37 | #ifndef SHARED |
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| 38 | # define RELRO attribute_relro |
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| 39 | #else |
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| 40 | # define RELRO |
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| 41 | #endif |
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| 42 | |
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| 43 | #if defined PROCINFO_DECL || !defined SHARED |
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| 44 | # ifdef HAVE_CLOCK_GETTIME_VSYSCALL |
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| 45 | PROCINFO_CLASS int (*_dl_vdso_clock_gettime) (clockid_t, |
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| 46 | struct timespec *) RELRO; |
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| 47 | #endif |
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| 48 | # ifdef HAVE_CLOCK_GETTIME64_VSYSCALL |
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| 49 | PROCINFO_CLASS int (*_dl_vdso_clock_gettime64) (clockid_t, |
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| 50 | struct __timespec64 *) RELRO; |
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| 51 | #endif |
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| 52 | # ifdef HAVE_GETTIMEOFDAY_VSYSCALL |
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| 53 | PROCINFO_CLASS int (*_dl_vdso_gettimeofday) (struct timeval *, void *) RELRO; |
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| 54 | #endif |
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| 55 | # ifdef HAVE_TIME_VSYSCALL |
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| 56 | PROCINFO_CLASS time_t (*_dl_vdso_time) (time_t *) RELRO; |
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| 57 | # endif |
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| 58 | # ifdef HAVE_GETCPU_VSYSCALL |
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| 59 | PROCINFO_CLASS int (*_dl_vdso_getcpu) (unsigned *, unsigned *, void *) RELRO; |
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| 60 | # endif |
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| 61 | # ifdef HAVE_CLOCK_GETRES_VSYSCALL |
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| 62 | PROCINFO_CLASS int (*_dl_vdso_clock_getres) (clockid_t, |
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| 63 | struct timespec *) RELRO; |
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| 64 | # endif |
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| 65 | # ifdef HAVE_CLOCK_GETRES64_VSYSCALL |
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| 66 | PROCINFO_CLASS int (*_dl_vdso_clock_getres_time64) (clockid_t, |
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| 67 | struct __timespec64 *) RELRO; |
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| 68 | # endif |
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| 69 | |
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| 70 | /* PowerPC specific ones. */ |
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| 71 | # ifdef HAVE_GET_TBFREQ |
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| 72 | PROCINFO_CLASS uint64_t (*_dl_vdso_get_tbfreq)(void) RELRO; |
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| 73 | # endif |
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| 74 | #endif |
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| 75 | |
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| 76 | #undef RELRO |
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| 77 | #undef PROCINFO_DECL |
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| 78 | #undef PROCINFO_CLASS |
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| 79 | |
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