sysdeps/powerpc/mod-cache-ppc.c

   1 /* Test if an executable can read from rtld_global_ro._dl_cache_line_size.
   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 #include <stdio.h>
  20 #include <stdint.h>
  21 #include <inttypes.h>
  22 #include <sys/auxv.h>
  23 #include <ldsodefs.h>
  24 #include <errno.h>
  25
  26 /* errnop is required in order to work around BZ #20802.  */
  27 int
  28 test_cache (int *errnop)
  29 {
  30   int cls1 = GLRO (dl_cache_line_size);
  31   errno = *errnop;
  32   uint64_t cls2 = getauxval (AT_DCACHEBSIZE);
  33   *errnop = errno;
  34
  35   printf ("AT_DCACHEBSIZE      = %" PRIu64 " B\n", cls2);
  36   printf ("_dl_cache_line_size = %d B\n", cls1);
  37
  38   if (cls1 != cls2)
  39     {
  40       printf ("error: _dl_cache_line_size != AT_DCACHEBSIZE\n");
  41       return 1;
  42     }
  43
  44   return 0;
  45 }