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/* Support for GNU properties. AArch64 version.
Copyright (C) 2018-2023 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 _DL_PROP_H
#define _DL_PROP_H
extern void _dl_bti_protect (struct link_map *, int) attribute_hidden;
extern void _dl_bti_check (struct link_map *, const char *)
attribute_hidden;
static inline void __attribute__ ((always_inline))
_rtld_main_check (struct link_map *m, const char *program)
{
_dl_bti_check (m, program);
}
static inline void __attribute__ ((always_inline))
_dl_open_check (struct link_map *m)
{
_dl_bti_check (m, NULL);
}
static inline void __attribute__ ((always_inline))
_dl_process_pt_note (struct link_map *l, int fd, const ElfW(Phdr) *ph)
{
}
static inline int
_dl_process_gnu_property (struct link_map *l, int fd, uint32_t type,
uint32_t datasz, void *data)
{
if (!GLRO(dl_aarch64_cpu_features).bti)
/* Skip note processing. */
return 0;
if (type == GNU_PROPERTY_AARCH64_FEATURE_1_AND)
{
/* Stop if the property note is ill-formed. */
if (datasz != 4)
return 0;
unsigned int feature_1 = *(unsigned int *) data;
if (feature_1 & GNU_PROPERTY_AARCH64_FEATURE_1_BTI)
_dl_bti_protect (l, fd);
/* Stop if we processed the property note. */
return 0;
}
/* Continue. */
return 1;
}
#endif /* _DL_PROP_H */
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