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56 lines
2.3 KiB
C
56 lines
2.3 KiB
C
/* This file is part of the GNU C Library.
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Copyright (C) 2013-2020 Free Software Foundation, Inc.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <ldsodefs.h>
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/* The code checks if _rtld_global_ro was realocated before trying to access
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the dl_hwcap field. The assembly is to make the compiler not optimize the
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test (&_rtld_global_ro != NULL), which is always true in ISO C (but not
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in that case since _rtld_global_ro might not been realocated yet). */
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#if defined(SHARED) && !IS_IN (rtld)
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# define __GLRO(value) \
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({ volatile void **__p = (volatile void**)(&_rtld_global_ro); \
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unsigned long int __ret; \
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asm ("# x in %0" : "+r" (__p)); \
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__ret = (__p) ? GLRO(value) : 0; \
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__ret; })
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#else
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# define __GLRO(value) GLRO(value)
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#endif
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/* dl_hwcap contains only the latest supported ISA, the macro checks which is
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and fills the previous ones. */
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#define INIT_ARCH() \
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unsigned long int hwcap = __GLRO(dl_hwcap); \
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unsigned long int __attribute__((unused)) hwcap2 = __GLRO(dl_hwcap2); \
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bool __attribute__((unused)) use_cached_memopt = \
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GLRO(dl_powerpc_cpu_features).use_cached_memopt; \
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if (hwcap & PPC_FEATURE_ARCH_2_06) \
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hwcap |= PPC_FEATURE_ARCH_2_05 | \
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PPC_FEATURE_POWER5_PLUS | \
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PPC_FEATURE_POWER5 | \
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PPC_FEATURE_POWER4; \
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else if (hwcap & PPC_FEATURE_ARCH_2_05) \
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hwcap |= PPC_FEATURE_POWER5_PLUS | \
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PPC_FEATURE_POWER5 | \
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PPC_FEATURE_POWER4; \
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else if (hwcap & PPC_FEATURE_POWER5_PLUS) \
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hwcap |= PPC_FEATURE_POWER5 | \
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PPC_FEATURE_POWER4; \
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else if (hwcap & PPC_FEATURE_POWER5) \
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hwcap |= PPC_FEATURE_POWER4;
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