1 /* Define INIT_ARCH so that midr is initialized before use by IFUNCs. 2 This file is part of the GNU C Library. 3 Copyright (C) 2017-2022 Free Software Foundation, Inc. 4 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. 9 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. 14 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/>. */ 18 19 #include <ldsodefs.h> 20 #include <sys/auxv.h> 21 22 /* Make glibc MTE-safe on a system that supports MTE in case user code 23 enables tag checks independently of the mte_status of glibc. There 24 is currently no ABI contract for enabling tag checks in user code, 25 but this can be useful for debugging with MTE. */ 26 #define MTE_ENABLED() (GLRO(dl_hwcap2) & HWCAP2_MTE) 27 28 #define INIT_ARCH() \ 29 uint64_t __attribute__((unused)) midr = \ 30 GLRO(dl_aarch64_cpu_features).midr_el1; \ 31 unsigned __attribute__((unused)) zva_size = \ 32 GLRO(dl_aarch64_cpu_features).zva_size; \ 33 bool __attribute__((unused)) bti = \ 34 HAVE_AARCH64_BTI && GLRO(dl_aarch64_cpu_features).bti; \ 35 bool __attribute__((unused)) mte = \ 36 MTE_ENABLED (); \ 37 bool __attribute__((unused)) sve = \ 38 GLRO(dl_aarch64_cpu_features).sve; 39