| 1 | /* Test if an executable can read from rtld_global_ro._dl_cache_line_size. |
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| 2 | Copyright (C) 2020-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <stdio.h> |
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| 20 | #include <stdint.h> |
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| 21 | #include <inttypes.h> |
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| 22 | #include <sys/auxv.h> |
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| 23 | #include <ldsodefs.h> |
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| 24 | #include <errno.h> |
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| 25 | |
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| 26 | /* errnop is required in order to work around BZ #20802. */ |
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| 27 | int |
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| 28 | test_cache (int *errnop) |
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| 29 | { |
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| 30 | int cls1 = GLRO (dl_cache_line_size); |
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| 31 | errno = *errnop; |
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| 32 | uint64_t cls2 = getauxval (AT_DCACHEBSIZE); |
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| 33 | *errnop = errno; |
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| 34 | |
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| 35 | printf (format: "AT_DCACHEBSIZE = %" PRIu64 " B\n" , cls2); |
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| 36 | printf (format: "_dl_cache_line_size = %d B\n" , cls1); |
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| 37 | |
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| 38 | if (cls1 != cls2) |
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| 39 | { |
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| 40 | printf (format: "error: _dl_cache_line_size != AT_DCACHEBSIZE\n" ); |
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| 41 | return 1; |
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| 42 | } |
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| 43 | |
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| 44 | return 0; |
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| 45 | } |
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| 46 | |
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