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

   1 /* This file is part of the GNU C Library.
   2    Copyright (C) 2013-2024 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    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <ldsodefs.h>
  19 #include <cpu-features.h>
  20
  21 /* The code checks if _rtld_global_ro was realocated before trying to access
  22    the dl_hwcap field. The assembly is to make the compiler not optimize the
  23    test (&_rtld_global_ro != NULL), which is always true in ISO C (but not
  24    in that case since _rtld_global_ro might not been realocated yet).  */
  25 #if defined(SHARED) && !IS_IN (rtld)
  26 # define __GLRO(value) \
  27   ({ volatile void **__p = (volatile void**)(&_rtld_global_ro); \
  28     unsigned long int __ret;                                    \
  29      asm ("# x in %0" : "+r" (__p));                            \
  30      __ret = (__p) ? GLRO(value) : 0;                           \
  31      __ret; })
  32 #else
  33 # define __GLRO(value)  GLRO(value)
  34 #endif
  35
  36 /* Get the hardware information post the tunables set, the macro checks
  37    it and fills the previous ones.  */
  38 #define INIT_ARCH() \
  39   const struct cpu_features *features = &GLRO(dl_powerpc_cpu_features); \
  40   unsigned long int hwcap = features->hwcap;                            \
  41   unsigned long int __attribute__((unused)) hwcap2 = features->hwcap2; \
  42   bool __attribute__((unused)) use_cached_memopt =              \
  43     __GLRO(dl_powerpc_cpu_features.use_cached_memopt);          \
  44   if (hwcap & PPC_FEATURE_ARCH_2_06)                            \
  45     hwcap |= PPC_FEATURE_ARCH_2_05 |                            \
  46              PPC_FEATURE_POWER5_PLUS |                          \
  47              PPC_FEATURE_POWER5 |                               \
  48              PPC_FEATURE_POWER4;                                \
  49   else if (hwcap & PPC_FEATURE_ARCH_2_05)                       \
  50     hwcap |= PPC_FEATURE_POWER5_PLUS |                          \
  51              PPC_FEATURE_POWER5 |                               \
  52              PPC_FEATURE_POWER4;                                \
  53   else if (hwcap & PPC_FEATURE_POWER5_PLUS)                     \
  54     hwcap |= PPC_FEATURE_POWER5 |                               \
  55              PPC_FEATURE_POWER4;                                \
  56   else if (hwcap & PPC_FEATURE_POWER5)                          \
  57     hwcap |= PPC_FEATURE_POWER4;