| /* vDSO common definition for Linux. |
| Copyright (C) 2015-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef SYSDEP_VDSO_LINUX_H |
| # define SYSDEP_VDSO_LINUX_H |
| |
| #define VDSO_SYMBOL(__name) __vdso_##__name |
| |
| #ifndef INTERNAL_VSYSCALL_CALL |
| # define INTERNAL_VSYSCALL_CALL(funcptr, err, nr, args...) \ |
| funcptr (args) |
| #endif |
| |
| #ifdef SHARED |
| |
| # ifdef HAVE_VSYSCALL |
| |
| # include <libc-vdso.h> |
| |
| # define INLINE_VSYSCALL(name, nr, args...) \ |
| ({ \ |
| __label__ out; \ |
| __label__ iserr; \ |
| INTERNAL_SYSCALL_DECL (sc_err); \ |
| long int sc_ret; \ |
| \ |
| __typeof (__vdso_##name) vdsop = __vdso_##name; \ |
| PTR_DEMANGLE (vdsop); \ |
| if (vdsop != NULL) \ |
| { \ |
| sc_ret = INTERNAL_VSYSCALL_CALL (vdsop, sc_err, nr, ##args); \ |
| if (!INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err)) \ |
| goto out; \ |
| if (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err) != ENOSYS) \ |
| goto iserr; \ |
| } \ |
| \ |
| sc_ret = INTERNAL_SYSCALL (name, sc_err, nr, ##args); \ |
| if (INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err)) \ |
| { \ |
| iserr: \ |
| __set_errno (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err)); \ |
| sc_ret = -1L; \ |
| } \ |
| out: \ |
| sc_ret; \ |
| }) |
| |
| # define INTERNAL_VSYSCALL(name, err, nr, args...) \ |
| ({ \ |
| __label__ out; \ |
| long v_ret; \ |
| \ |
| __typeof (__vdso_##name) vdsop = __vdso_##name; \ |
| PTR_DEMANGLE (vdsop); \ |
| if (vdsop != NULL) \ |
| { \ |
| v_ret = INTERNAL_VSYSCALL_CALL (vdsop, err, nr, ##args); \ |
| if (!INTERNAL_SYSCALL_ERROR_P (v_ret, err) \ |
| || INTERNAL_SYSCALL_ERRNO (v_ret, err) != ENOSYS) \ |
| goto out; \ |
| } \ |
| v_ret = INTERNAL_SYSCALL (name, err, nr, ##args); \ |
| out: \ |
| v_ret; \ |
| }) |
| # else |
| # define INLINE_VSYSCALL(name, nr, args...) \ |
| INLINE_SYSCALL (name, nr, ##args) |
| # define INTERNAL_VSYSCALL(name, err, nr, args...) \ |
| INTERNAL_SYSCALL (name, err, nr, ##args) |
| # endif /* HAVE_VSYSCALL */ |
| |
| # else /* SHARED */ |
| |
| # define INLINE_VSYSCALL(name, nr, args...) \ |
| INLINE_SYSCALL (name, nr, ##args) |
| # define INTERNAL_VSYSCALL(name, err, nr, args...) \ |
| INTERNAL_SYSCALL (name, err, nr, ##args) |
| |
| #endif /* SHARED */ |
| |
| #endif /* SYSDEP_VDSO_LINUX_H */ |