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fcd6a8b5c5
Add a new helper function __ifunc_hwcap() as a portable way to
access HWCAP elements via the parameter(s) passed to an ifunc
resolver checking the _IFUNC_ARG_HWCAP bit in the first parameter
and size of the buffer in the second parameter.
Note that 0 is returned when the requested element is not available
or does not correspond to a valid AT_HWCAP{,2,...} value.
Also add relevant tests.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
98 lines
2.9 KiB
C
98 lines
2.9 KiB
C
/* Tests for __ifunc_hwcap helper function.
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Copyright (C) 2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stdint.h>
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#include <sys/ifunc.h>
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#include <support/check.h>
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#define CHECK_VALUES_WITH_ARG(p1, p2, p3, p4) \
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({ \
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TEST_COMPARE (__ifunc_hwcap (0, _IFUNC_ARG_HWCAP, arg), 0); \
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TEST_COMPARE (__ifunc_hwcap (_IFUNC_ARG_AT_HWCAP, _IFUNC_ARG_HWCAP, arg), p1); \
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TEST_COMPARE (__ifunc_hwcap (_IFUNC_ARG_AT_HWCAP2, _IFUNC_ARG_HWCAP, arg), p2); \
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TEST_COMPARE (__ifunc_hwcap (_IFUNC_ARG_AT_HWCAP3, _IFUNC_ARG_HWCAP, arg), p3); \
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TEST_COMPARE (__ifunc_hwcap (_IFUNC_ARG_AT_HWCAP4, _IFUNC_ARG_HWCAP, arg), p4); \
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TEST_COMPARE (__ifunc_hwcap (5, _IFUNC_ARG_HWCAP, arg), 0); \
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})
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#define CHECK_VALUES_WITHOUT_ARG(p1) \
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({ \
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TEST_COMPARE (__ifunc_hwcap (0, p1, arg), 0); \
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TEST_COMPARE (__ifunc_hwcap (_IFUNC_ARG_AT_HWCAP, p1, arg), p1); \
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TEST_COMPARE (__ifunc_hwcap (_IFUNC_ARG_AT_HWCAP2, p1, arg), 0); \
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TEST_COMPARE (__ifunc_hwcap (_IFUNC_ARG_AT_HWCAP3, p1, arg), 0); \
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TEST_COMPARE (__ifunc_hwcap (_IFUNC_ARG_AT_HWCAP4, p1, arg), 0); \
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TEST_COMPARE (__ifunc_hwcap (5, p1, arg), 0); \
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})
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static void
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test_one (const unsigned long *arg)
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{
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uint64_t size = arg[0] / sizeof (uint64_t);
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switch (size)
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{
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case 1:
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CHECK_VALUES_WITH_ARG (0, 0, 0, 0);
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CHECK_VALUES_WITHOUT_ARG (0);
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break;
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case 2:
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CHECK_VALUES_WITH_ARG (1, 0, 0, 0);
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CHECK_VALUES_WITHOUT_ARG (1);
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break;
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case 3:
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CHECK_VALUES_WITH_ARG (1, 2, 0, 0);
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CHECK_VALUES_WITHOUT_ARG (1);
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break;
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case 4:
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CHECK_VALUES_WITH_ARG (1, 2, 3, 0);
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CHECK_VALUES_WITHOUT_ARG (1);
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break;
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case 5:
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CHECK_VALUES_WITH_ARG (1, 2, 3, 4);
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CHECK_VALUES_WITHOUT_ARG (1);
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break;
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default:
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TEST_VERIFY (0); // unexpected size
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break;
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}
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}
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static int
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do_test (void)
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{
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uint64_t arg[_IFUNC_HWCAP_MAX + 1] = {
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0, /* Placeholder for size */
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_IFUNC_ARG_AT_HWCAP, /* AT_HWCAP */
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_IFUNC_ARG_AT_HWCAP2, /* AT_HWCAP2 */
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_IFUNC_ARG_AT_HWCAP3, /* AT_HWCAP3 */
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_IFUNC_ARG_AT_HWCAP4, /* AT_HWCAP4 */
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};
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for (int k = 0; k <= _IFUNC_HWCAP_MAX; k++)
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{
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/* Update size */
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arg[0] = (k + 1) * sizeof (uint64_t);
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test_one (arg);
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}
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return 0;
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}
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#include <support/test-driver.c>
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