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/* Support for GNU properties in ldconfig. x86 version.
Copyright (C) 2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#ifndef _ELF_READ_PROP_H
#define _ELF_READ_PROP_H
#include <dl-cache.h>
/* Called for each property in the NT_GNU_PROPERTY_TYPE_0 note of SEGMENT.
Return value:
false: Continue processing the properties.
true : Stop processing the properties.
*/
static inline bool __attribute__ ((always_inline))
read_gnu_property (unsigned int *isal_level, uint32_t type,
uint32_t datasz, void *data)
{
/* Property type must be in ascending order. */
if (type > GNU_PROPERTY_X86_ISA_1_NEEDED)
return true;
if (type == GNU_PROPERTY_X86_ISA_1_NEEDED)
{
if (datasz == 4)
{
/* The size of GNU_PROPERTY_X86_ISA_1_NEEDED must be 4 bytes.
There is no point to continue if this type is ill-formed. */
unsigned int isa_1_needed = *(unsigned int *) data;
_Static_assert (((sizeof (isa_1_needed) * 8)
<= (1 << DL_CACHE_HWCAP_ISA_LEVEL_COUNT)),
"DL_CACHE_HWCAP_ISA_LEVEL_COUNT is too small");
if (isa_1_needed != 0)
{
unsigned int level;
asm ("bsr %1, %0" : "=r" (level) : "g" (isa_1_needed));
*isal_level = level;
}
}
return true;
}
return false;
}
#endif
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