1  /* Data for vDSO support.  Linux version.
       2     Copyright (C) 2020-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  /* This file is included in three different modes for both static (libc.a)
      20     and shared (rtld) modes:
      21  
      22     1. PROCINFO_DECL is defined, meaning we are only interested in
      23        declarations.  For static it requires use the extern keyword along with
      24        the attribute_relro while for shared it will be embedded in the
      25        rtld_global_ro.
      26  
      27     2. PROCINFO_DECL and SHARED are not defined.  Nothing to do, the default
      28        zero initializion is suffice.
      29  
      30     3. PROCINFO_DECL is not defined while SHARED is.  Similar to 2., the zero
      31        initialization of rtld_global_ro is suffice.  */
      32  
      33  #ifndef PROCINFO_CLASS
      34  # define PROCINFO_CLASS
      35  #endif
      36  
      37  #ifndef SHARED
      38  # define RELRO attribute_relro
      39  #else
      40  # define RELRO
      41  #endif
      42  
      43  #if defined PROCINFO_DECL || !defined SHARED
      44  # ifdef HAVE_CLOCK_GETTIME_VSYSCALL
      45  PROCINFO_CLASS int (*_dl_vdso_clock_gettime) (clockid_t,
      46  					      struct timespec *) RELRO;
      47  #endif
      48  # ifdef HAVE_CLOCK_GETTIME64_VSYSCALL
      49  PROCINFO_CLASS int (*_dl_vdso_clock_gettime64) (clockid_t,
      50  						struct __timespec64 *) RELRO;
      51  #endif
      52  # ifdef HAVE_GETTIMEOFDAY_VSYSCALL
      53  PROCINFO_CLASS int (*_dl_vdso_gettimeofday) (struct timeval *, void *) RELRO;
      54  #endif
      55  # ifdef HAVE_TIME_VSYSCALL
      56  PROCINFO_CLASS time_t (*_dl_vdso_time) (time_t *) RELRO;
      57  # endif
      58  # ifdef HAVE_GETCPU_VSYSCALL
      59  PROCINFO_CLASS int (*_dl_vdso_getcpu) (unsigned *, unsigned *, void *) RELRO;
      60  # endif
      61  # ifdef HAVE_CLOCK_GETRES_VSYSCALL
      62  PROCINFO_CLASS int (*_dl_vdso_clock_getres) (clockid_t,
      63  					     struct timespec *) RELRO;
      64  # endif
      65  # ifdef HAVE_CLOCK_GETRES64_VSYSCALL
      66  PROCINFO_CLASS int (*_dl_vdso_clock_getres_time64) (clockid_t,
      67  						    struct __timespec64 *) RELRO;
      68  # endif
      69  
      70  /* PowerPC specific ones.  */
      71  # ifdef HAVE_GET_TBFREQ
      72  PROCINFO_CLASS uint64_t (*_dl_vdso_get_tbfreq)(void) RELRO;
      73  # endif
      74  #endif
      75  
      76  #undef RELRO
      77  #undef PROCINFO_DECL
      78  #undef PROCINFO_CLASS