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Both vdso_test_gettimeofday and vdso_standalone_test_x86 use the library in parse_vdso.c but each separately declares the API it offers which is not ideal. Create a header file with prototypes of the functions and use it in both the library and the tests to ensure that the same prototypes are used throughout. Signed-off-by: Mark Brown <broonie@kernel.org> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
31 lines
1,009 B
C
31 lines
1,009 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef PARSE_VDSO_H
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#define PARSE_VDSO_H
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#include <stdint.h>
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/*
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* To use this vDSO parser, first call one of the vdso_init_* functions.
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* If you've already parsed auxv, then pass the value of AT_SYSINFO_EHDR
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* to vdso_init_from_sysinfo_ehdr. Otherwise pass auxv to vdso_init_from_auxv.
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* Then call vdso_sym for each symbol you want. For example, to look up
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* gettimeofday on x86_64, use:
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*
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* <some pointer> = vdso_sym("LINUX_2.6", "gettimeofday");
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* or
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* <some pointer> = vdso_sym("LINUX_2.6", "__vdso_gettimeofday");
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*
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* vdso_sym will return 0 if the symbol doesn't exist or if the init function
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* failed or was not called. vdso_sym is a little slow, so its return value
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* should be cached.
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*
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* vdso_sym is threadsafe; the init functions are not.
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*
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* These are the prototypes:
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*/
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void *vdso_sym(const char *version, const char *name);
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void vdso_init_from_sysinfo_ehdr(uintptr_t base);
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void vdso_init_from_auxv(void *auxv);
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#endif
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