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 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <config.h>
  21 #include <kernel-features.h>
  22 #include <ldsodefs.h>
  23
  24 extern int __cache_line_size;
  25 weak_extern (__cache_line_size)
  26
  27 /* Scan the Aux Vector for the "Data Cache Block Size" entry.  If found
  28    verify that the static extern __cache_line_size is defined by checking
  29    for not NULL.  If it is defined then assign the cache block size
  30    value to __cache_line_size.  */
  31 #define DL_PLATFORM_AUXV                                                      \
  32       case AT_DCACHEBSIZE:                                                    \
  33         {                                                                     \
  34           int *cls = & __cache_line_size;                                     \
  35           if (cls != NULL)                                                    \
  36             *cls = av->a_un.a_val;                                            \
  37         }                                                                     \
  38       break;
  39
  40 #ifndef __ASSUME_STD_AUXV
  41
  42 /* The PowerPC's auxiliary argument block gets aligned to a 16-byte
  43    boundary.  This is history and impossible to change compatibly.  */
  44
  45 #define DL_FIND_ARG_COMPONENTS(cookie, argc, argv, envp, auxp) \
  46   do {                                                                        \
  47     char **_tmp;                                                              \
  48     size_t _test;                                                             \
  49     (argc) = *(long int *) cookie;                                            \
  50     (argv) = (char **) cookie + 1;                                            \
  51     (envp) = (argv) + (argc) + 1;                                             \
  52     for (_tmp = (envp); *_tmp; ++_tmp)                                        \
  53       continue;                                                               \
  54     /* The following '++' is important!  */                                   \
  55     ++_tmp;                                                                   \
  56                                                                               \
  57     _test = (size_t)_tmp;                                                     \
  58     _test = (_test + 0xf) & ~0xf;                                             \
  59     /* Under some circumstances, MkLinux (up to at least DR3a5)               \
  60        omits the padding.  To work around this, we make a                     \
  61        basic sanity check of the argument vector.  Of                         \
  62        course, this means that in future, the argument                        \
  63        vector will have to be laid out to allow for this                      \
  64        test :-(.  */                                                          \
  65      if (((ElfW(auxv_t) *)_test)->a_type <= 0x10)                             \
  66        _tmp = (char **)_test;                                                 \
  67     (auxp) = (ElfW(auxv_t) *) _tmp;                                           \
  68   } while (0)
  69 #endif
  70
  71 #include <sysdeps/unix/sysv/linux/dl-sysdep.c>