sysdeps/powerpc/powerpc32/power4/multiarch/init-arch.h

   1 /* This file is part of the GNU C Library.
   2    Copyright (C) 2013-2015 Free Software Foundation, Inc.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <ldsodefs.h>
  19
  20 /* The code checks if _rtld_global_ro was realocated before trying to access
  21    the dl_hwcap field. The assembly is to make the compiler not optimize the
  22    test (&_rtld_global_ro != NULL), which is always true in ISO C (but not
  23    in that case since _rtld_global_ro might not been realocated yet).  */
  24 #if defined(SHARED) && !IS_IN (rtld)
  25 # define __GLRO(value) \
  26   ({ volatile void **__p = (volatile void**)(&_rtld_global_ro); \
  27     unsigned long int __ret;                                    \
  28      asm ("# x in %0" : "+r" (__p));                            \
  29      __ret = (__p) ? GLRO(value) : 0;                           \
  30      __ret; })
  31 #else
  32 # define __GLRO(value)  GLRO(value)
  33 #endif
  34
  35 /* dl_hwcap contains only the latest supported ISA, the macro checks which is
  36    and fills the previous ones.  */
  37 #define INIT_ARCH() \
  38   unsigned long int hwcap = __GLRO(dl_hwcap);                   \
  39   unsigned long int __attribute__((unused)) hwcap2 = __GLRO(dl_hwcap2); \
  40   if (hwcap & PPC_FEATURE_ARCH_2_06)                            \
  41     hwcap |= PPC_FEATURE_ARCH_2_05 |                            \
  42              PPC_FEATURE_POWER5_PLUS |                          \
  43              PPC_FEATURE_POWER5 |                               \
  44              PPC_FEATURE_POWER4;                                \
  45   else if (hwcap & PPC_FEATURE_ARCH_2_05)                       \
  46     hwcap |= PPC_FEATURE_POWER5_PLUS |                          \
  47              PPC_FEATURE_POWER5 |                               \
  48              PPC_FEATURE_POWER4;                                \
  49   else if (hwcap & PPC_FEATURE_POWER5_PLUS)                     \
  50     hwcap |= PPC_FEATURE_POWER5 |                               \
  51              PPC_FEATURE_POWER4;                                \
  52   else if (hwcap & PPC_FEATURE_POWER5)                          \
  53     hwcap |= PPC_FEATURE_POWER4;