From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- tools/testing/selftests/vDSO/parse_vdso.h | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 tools/testing/selftests/vDSO/parse_vdso.h (limited to 'tools/testing/selftests/vDSO/parse_vdso.h') diff --git a/tools/testing/selftests/vDSO/parse_vdso.h b/tools/testing/selftests/vDSO/parse_vdso.h new file mode 100644 index 000000000..de0453067 --- /dev/null +++ b/tools/testing/selftests/vDSO/parse_vdso.h @@ -0,0 +1,31 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#ifndef PARSE_VDSO_H +#define PARSE_VDSO_H + +#include + +/* + * 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: + * + * = vdso_sym("LINUX_2.6", "gettimeofday"); + * or + * = 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); +void vdso_init_from_auxv(void *auxv); + +#endif -- cgit v1.2.3