diff options
| -rw-r--r-- | sysdeps/unix/sysv/linux/aarch64/libc-start.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/aarch64/libc-start.h b/sysdeps/unix/sysv/linux/aarch64/libc-start.h new file mode 100644 index 0000000000..ccf0f8af5c --- /dev/null +++ b/sysdeps/unix/sysv/linux/aarch64/libc-start.h @@ -0,0 +1,49 @@ +/* AArch64 definitions for libc main startup. + Copyright (C) 2024 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 + +# ifndef PR_SET_SHADOW_STACK_STATUS +# define PR_GET_SHADOW_STACK_STATUS 71 +# define PR_SET_SHADOW_STACK_STATUS 72 +# define PR_LOCK_SHADOW_STACK_STATUS 73 +# define PR_SHADOW_STACK_ENABLE (1UL << 0) +# define PR_SHADOW_STACK_WRITE (1UL << 1) +# define PR_SHADOW_STACK_PUSH (1UL << 2) +# 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 (); + + uint64_t s = GL(dl_aarch64_gcs); + if (s != 0) + INLINE_SYSCALL_CALL (prctl, PR_SET_SHADOW_STACK_STATUS, s, 0, 0, 0); +} + +# define ARCH_SETUP_IREL() apply_irel () +# define ARCH_SETUP_TLS() aarch64_libc_setup_tls () +# define ARCH_APPLY_IREL() +#endif /* ! SHARED */ + +#endif /* _LIBC_START_H */ |