42 lines
1.3 KiB
C
42 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2020 Linaro Limited. All rights reserved.
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* Author: Viresh Kumar <viresh.kumar@linaro.org>
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*/
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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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#include <time.h>
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extern void vdso_init_from_auxv(void *auxv);
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extern void vdso_init_from_sysinfo_ehdr(uintptr_t base);
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extern void *vdso_sym(const char *version, const char *name);
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typedef int (*gettime_t)(clockid_t clk_id, void *ts);
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void find_clock_gettime_vdso(gettime_t *ptr_vdso_gettime,
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gettime_t *ptr_vdso_gettime64);
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#endif /* PARSE_VDSO_H__ */
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