| 1 | /* Definitions used by AArch64 indirect function resolvers. |
|---|---|
| 2 | Copyright (C) 2019-2024 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 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 | #ifndef _SYS_IFUNC_H |
| 20 | #define _SYS_IFUNC_H |
| 21 | |
| 22 | /* A second argument is passed to the ifunc resolver. */ |
| 23 | #define _IFUNC_ARG_HWCAP (1ULL << 62) |
| 24 | |
| 25 | /* The prototype of a gnu indirect function resolver on AArch64 is |
| 26 | |
| 27 | ElfW(Addr) ifunc_resolver (uint64_t, const __ifunc_arg_t *); |
| 28 | |
| 29 | the first argument should have the _IFUNC_ARG_HWCAP bit set and |
| 30 | the remaining bits should match the AT_HWCAP settings. */ |
| 31 | |
| 32 | /* Second argument to an ifunc resolver. */ |
| 33 | struct __ifunc_arg_t |
| 34 | { |
| 35 | unsigned long _size; /* Size of the struct, so it can grow. */ |
| 36 | unsigned long _hwcap; |
| 37 | unsigned long _hwcap2; |
| 38 | }; |
| 39 | |
| 40 | typedef struct __ifunc_arg_t __ifunc_arg_t; |
| 41 | |
| 42 | #endif |
| 43 |