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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>
81 lines
2.4 KiB
C
81 lines
2.4 KiB
C
/* Test R_*_IRELATIVE resolver with second argument.
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Copyright (C) 2019-2025 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/auxv.h>
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#include <sys/ifunc.h>
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#include <support/check.h>
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static int
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one (void)
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{
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return 1;
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}
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static uint64_t saved_arg1;
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static __ifunc_arg_t saved_arg2;
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/* local ifunc symbol. */
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int
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__attribute__ ((visibility ("hidden")))
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foo (void);
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static void *
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__attribute__ ((used))
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foo_ifunc (uint64_t, const __ifunc_arg_t *) __asm__ ("foo");
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__asm__(".type foo, %gnu_indirect_function");
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static void *
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__attribute__ ((used))
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inhibit_stack_protector
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foo_ifunc (uint64_t arg1, const __ifunc_arg_t *arg2)
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{
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saved_arg1 = arg1;
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if (arg1 & _IFUNC_ARG_HWCAP)
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saved_arg2 = *arg2;
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return (void *) one;
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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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TEST_VERIFY (foo () == 1);
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TEST_VERIFY (saved_arg1 & _IFUNC_ARG_HWCAP);
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TEST_COMPARE ((uint32_t)saved_arg1, (uint32_t)getauxval (AT_HWCAP));
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TEST_COMPARE (saved_arg2._size, sizeof (__ifunc_arg_t));
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TEST_COMPARE (saved_arg2._hwcap, getauxval (AT_HWCAP));
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TEST_COMPARE (saved_arg2._hwcap2, getauxval (AT_HWCAP2));
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TEST_COMPARE (saved_arg2._hwcap3, getauxval (AT_HWCAP3));
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TEST_COMPARE (saved_arg2._hwcap4, getauxval (AT_HWCAP4));
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const unsigned long *saved_arg2_ptr = (const unsigned long *)&saved_arg2;
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TEST_COMPARE (__ifunc_hwcap (1, saved_arg1, saved_arg2_ptr),
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getauxval (AT_HWCAP));
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TEST_COMPARE (__ifunc_hwcap (2, saved_arg1, saved_arg2_ptr),
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getauxval (AT_HWCAP2));
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TEST_COMPARE (__ifunc_hwcap (3, saved_arg1, saved_arg2_ptr),
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getauxval (AT_HWCAP3));
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TEST_COMPARE (__ifunc_hwcap (4, saved_arg1, saved_arg2_ptr),
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getauxval (AT_HWCAP4));
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return 0;
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}
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#include <support/test-driver.c>
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