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61 lines
1.9 KiB
C
61 lines
1.9 KiB
C
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/* Support for GNU properties in ldconfig. x86 version.
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Copyright (C) 2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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#ifndef _ELF_READ_PROP_H
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#define _ELF_READ_PROP_H
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#include <dl-cache.h>
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/* Called for each property in the NT_GNU_PROPERTY_TYPE_0 note of SEGMENT.
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Return value:
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false: Continue processing the properties.
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true : Stop processing the properties.
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*/
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static inline bool __attribute__ ((always_inline))
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read_gnu_property (unsigned int *isal_level, uint32_t type,
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uint32_t datasz, void *data)
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{
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/* Property type must be in ascending order. */
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if (type > GNU_PROPERTY_X86_ISA_1_NEEDED)
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return true;
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if (type == GNU_PROPERTY_X86_ISA_1_NEEDED)
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{
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if (datasz == 4)
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{
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/* The size of GNU_PROPERTY_X86_ISA_1_NEEDED must be 4 bytes.
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There is no point to continue if this type is ill-formed. */
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unsigned int isa_1_needed = *(unsigned int *) data;
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_Static_assert (((sizeof (isa_1_needed) * 8)
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<= (1 << DL_CACHE_HWCAP_ISA_LEVEL_COUNT)),
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"DL_CACHE_HWCAP_ISA_LEVEL_COUNT is too small");
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if (isa_1_needed != 0)
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{
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unsigned int level;
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asm ("bsr %1, %0" : "=r" (level) : "g" (isa_1_needed));
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*isal_level = level;
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}
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}
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return true;
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}
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return false;
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}
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#endif
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