1 /* Support for GNU properties in ldconfig. x86 version.
2 Copyright (C) 2021-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
19 #ifndef _ELF_READ_PROP_H
20 #define _ELF_READ_PROP_H
24 /* Called for each property in the NT_GNU_PROPERTY_TYPE_0 note of SEGMENT.
26 false: Continue processing the properties.
27 true : Stop processing the properties.
29 static inline bool __attribute__ ((always_inline
))
30 read_gnu_property (unsigned int *isal_level
, uint32_t type
,
31 uint32_t datasz
, void *data
)
33 /* Property type must be in ascending order. */
34 if (type
> GNU_PROPERTY_X86_ISA_1_NEEDED
)
37 if (type
== GNU_PROPERTY_X86_ISA_1_NEEDED
)
41 /* The size of GNU_PROPERTY_X86_ISA_1_NEEDED must be 4 bytes.
42 There is no point to continue if this type is ill-formed. */
43 unsigned int isa_1_needed
= *(unsigned int *) data
;
44 _Static_assert (((sizeof (isa_1_needed
) * 8)
45 <= (1 << DL_CACHE_HWCAP_ISA_LEVEL_COUNT
)),
46 "DL_CACHE_HWCAP_ISA_LEVEL_COUNT is too small");
47 if (isa_1_needed
!= 0)
50 asm ("bsr %1, %0" : "=r" (level
) : "g" (isa_1_needed
));