/* SPDX-License-Identifier: GPL-2.0-only */ #ifndef PARSE_VDSO_H #define PARSE_VDSO_H #include <stdint.h> /* * To use this vDSO parser, first call one of the vdso_init_* functions. * If you've already parsed auxv, then pass the value of AT_SYSINFO_EHDR * to vdso_init_from_sysinfo_ehdr. Otherwise pass auxv to vdso_init_from_auxv. * Then call vdso_sym for each symbol you want. For example, to look up * gettimeofday on x86_64, use: * * <some pointer> = vdso_sym("LINUX_2.6", "gettimeofday"); * or * <some pointer> = vdso_sym("LINUX_2.6", "__vdso_gettimeofday"); * * vdso_sym will return 0 if the symbol doesn't exist or if the init function * failed or was not called. vdso_sym is a little slow, so its return value * should be cached. * * vdso_sym is threadsafe; the init functions are not. * * These are the prototypes: */ void *vdso_sym(const char *version, const char *name); void vdso_init_from_sysinfo_ehdr(uintptr_t base); #endif