/* AArch64 GCS (Guarded Control Stack) declarations. This file is part of the GNU C Library. Copyright (C) 2024-2025 Free Software Foundation, Inc. Copyright The GNU Toolchain Authors. 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 . */ #ifndef _AARCH64_GCS_H #define _AARCH64_GCS_H #include #include struct gcs_record { void *gcs_base; void *gcs_token; size_t gcs_size; }; void *__alloc_gcs (size_t, struct gcs_record *) attribute_hidden; static inline bool has_gcs (void) { register unsigned long x16 asm ("x16") = 1; asm ("hint 40" /* chkfeat x16 */ : "+r" (x16)); return x16 == 0; } #endif