1/* vDSO common definition for Linux.
2 Copyright (C) 2015-2020 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#ifndef SYSDEP_VDSO_LINUX_H
20# define SYSDEP_VDSO_LINUX_H
21
22#include <ldsodefs.h>
23
24#ifndef INTERNAL_VSYSCALL_CALL
25# define INTERNAL_VSYSCALL_CALL(funcptr, err, nr, args...) \
26 funcptr (args)
27#endif
28
29#define INLINE_VSYSCALL(name, nr, args...) \
30 ({ \
31 __label__ out; \
32 __label__ iserr; \
33 INTERNAL_SYSCALL_DECL (sc_err); \
34 long int sc_ret; \
35 \
36 __typeof (GLRO(dl_vdso_##name)) vdsop = GLRO(dl_vdso_##name); \
37 if (vdsop != NULL) \
38 { \
39 sc_ret = INTERNAL_VSYSCALL_CALL (vdsop, sc_err, nr, ##args); \
40 if (!INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err)) \
41 goto out; \
42 if (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err) != ENOSYS) \
43 goto iserr; \
44 } \
45 \
46 sc_ret = INTERNAL_SYSCALL (name, sc_err, nr, ##args); \
47 if (INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err)) \
48 { \
49 iserr: \
50 __set_errno (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err)); \
51 sc_ret = -1L; \
52 } \
53 out: \
54 sc_ret; \
55 })
56
57#endif /* SYSDEP_VDSO_LINUX_H */
58