1/* vDSO common definition for Linux.
2 Copyright (C) 2015-2019 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 <http://www.gnu.org/licenses/>. */
18
19#ifndef SYSDEP_VDSO_LINUX_H
20# define SYSDEP_VDSO_LINUX_H
21
22#define VDSO_SYMBOL(__name) __vdso_##__name
23
24#ifndef INTERNAL_VSYSCALL_CALL
25# define INTERNAL_VSYSCALL_CALL(funcptr, err, nr, args...) \
26 funcptr (args)
27#endif
28
29#if USE_VSYSCALL && defined HAVE_VSYSCALL
30
31# include <libc-vdso.h>
32
33# define INLINE_VSYSCALL(name, nr, args...) \
34 ({ \
35 __label__ out; \
36 __label__ iserr; \
37 INTERNAL_SYSCALL_DECL (sc_err); \
38 long int sc_ret; \
39 \
40 __typeof (__vdso_##name) vdsop = __vdso_##name; \
41 PTR_DEMANGLE (vdsop); \
42 if (vdsop != NULL) \
43 { \
44 sc_ret = INTERNAL_VSYSCALL_CALL (vdsop, sc_err, nr, ##args); \
45 if (!INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err)) \
46 goto out; \
47 if (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err) != ENOSYS) \
48 goto iserr; \
49 } \
50 \
51 sc_ret = INTERNAL_SYSCALL (name, sc_err, nr, ##args); \
52 if (INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err)) \
53 { \
54 iserr: \
55 __set_errno (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err)); \
56 sc_ret = -1L; \
57 } \
58 out: \
59 sc_ret; \
60 })
61
62# define INTERNAL_VSYSCALL(name, err, nr, args...) \
63 ({ \
64 __label__ out; \
65 long v_ret; \
66 \
67 __typeof (__vdso_##name) vdsop = __vdso_##name; \
68 PTR_DEMANGLE (vdsop); \
69 if (vdsop != NULL) \
70 { \
71 v_ret = INTERNAL_VSYSCALL_CALL (vdsop, err, nr, ##args); \
72 if (!INTERNAL_SYSCALL_ERROR_P (v_ret, err) \
73 || INTERNAL_SYSCALL_ERRNO (v_ret, err) != ENOSYS) \
74 goto out; \
75 } \
76 v_ret = INTERNAL_SYSCALL (name, err, nr, ##args); \
77 out: \
78 v_ret; \
79 })
80#else
81
82# define INLINE_VSYSCALL(name, nr, args...) \
83 INLINE_SYSCALL (name, nr, ##args)
84# define INTERNAL_VSYSCALL(name, err, nr, args...) \
85 INTERNAL_SYSCALL (name, err, nr, ##args)
86
87#endif /* USE_VSYSCALL && defined HAVE_VSYSCALL */
88
89#endif /* SYSDEP_VDSO_LINUX_H */
90