sysdeps/unix/sysv/linux/powerpc/dl-sysdep.c

   1 /* Operating system support for run-time dynamic linker.  Linux/PPC version.
   2    Copyright (C) 1997, 1998, 2001, 2003, 2006, 2007
   3    Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <config.h>
  21 #include <kernel-features.h>
  22 #include <ldsodefs.h>
  23
  24 int __cache_line_size attribute_hidden;
  25
  26 /* Scan the Aux Vector for the "Data Cache Block Size" entry.  If found
  27    verify that the static extern __cache_line_size is defined by checking
  28    for not NULL.  If it is defined then assign the cache block size
  29    value to __cache_line_size.  */
  30 #define DL_PLATFORM_AUXV                                                      \
  31       case AT_DCACHEBSIZE:                                                    \
  32         __cache_line_size = av->a_un.a_val;                                   \
  33         break;
  34
  35 #ifndef __ASSUME_STD_AUXV
  36
  37 /* The PowerPC's auxiliary argument block gets aligned to a 16-byte
  38    boundary.  This is history and impossible to change compatibly.  */
  39
  40 #define DL_FIND_ARG_COMPONENTS(cookie, argc, argv, envp, auxp) \
  41   do {                                                                        \
  42     char **_tmp;                                                              \
  43     size_t _test;                                                             \
  44     (argc) = *(long int *) cookie;                                            \
  45     (argv) = (char **) cookie + 1;                                            \
  46     (envp) = (argv) + (argc) + 1;                                             \
  47     for (_tmp = (envp); *_tmp; ++_tmp)                                        \
  48       continue;                                                               \
  49     /* The following '++' is important!  */                                   \
  50     ++_tmp;                                                                   \
  51                                                                               \
  52     _test = (size_t)_tmp;                                                     \
  53     _test = (_test + 0xf) & ~0xf;                                             \
  54     /* Under some circumstances, MkLinux (up to at least DR3a5)               \
  55        omits the padding.  To work around this, we make a                     \
  56        basic sanity check of the argument vector.  Of                         \
  57        course, this means that in future, the argument                        \
  58        vector will have to be laid out to allow for this                      \
  59        test :-(.  */                                                          \
  60      if (((ElfW(auxv_t) *)_test)->a_type <= 0x10)                             \
  61        _tmp = (char **)_test;                                                 \
  62     (auxp) = (ElfW(auxv_t) *) _tmp;                                           \
  63   } while (0)
  64 #endif
  65
  66 #include <sysdeps/unix/sysv/linux/dl-sysdep.c>