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| 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 |
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