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/* AArch64 definitions for libc main startup.
Copyright (C) 2024-2025 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 _LIBC_START_H
#define _LIBC_START_H
#ifndef SHARED
# include <dl-prop.h>
# ifndef PR_SET_SHADOW_STACK_STATUS
# define PR_SET_SHADOW_STACK_STATUS 75
# define PR_SHADOW_STACK_ENABLE (1UL << 0)
# endif
/* Must be on a top-level stack frame that does not return. */
static inline void __attribute__((always_inline))
aarch64_libc_setup_tls (void)
{
__libc_setup_tls ();
struct link_map *main_map = _dl_get_dl_main_map ();
const ElfW(Phdr) *phdr = GL(dl_phdr);
const ElfW(Phdr) *ph;
for (ph = phdr; ph < phdr + GL(dl_phnum); ph++)
if (ph->p_type == PT_GNU_PROPERTY)
{
_dl_process_pt_gnu_property (main_map, -1, ph);
_rtld_main_check (main_map, _dl_argv[0]);
break;
}
if (GL(dl_aarch64_gcs) != 0)
{
int ret = INLINE_SYSCALL_CALL (prctl, PR_SET_SHADOW_STACK_STATUS,
PR_SHADOW_STACK_ENABLE, 0, 0, 0);
if (ret)
_dl_fatal_printf ("failed to enable GCS: %d\n", -ret);
}
}
# define ARCH_SETUP_IREL() apply_irel ()
# define ARCH_SETUP_TLS() aarch64_libc_setup_tls ()
# define ARCH_APPLY_IREL()
#endif /* ! SHARED */
#endif /* _LIBC_START_H */
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