1  /* vDSO common definition for Linux.
       2     Copyright (C) 2015-2023 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, nr, args...)		      	      \
      26       funcptr (args)
      27  #endif
      28  
      29  #define INLINE_VSYSCALL(name, nr, args...)				      \
      30    ({									      \
      31      __label__ out;							      \
      32      __label__ iserr;							      \
      33      long int sc_ret;							      \
      34  									      \
      35      __typeof (GLRO(dl_vdso_##name)) vdsop = GLRO(dl_vdso_##name);	      \
      36      if (vdsop != NULL)							      \
      37        {									      \
      38  	sc_ret = INTERNAL_VSYSCALL_CALL (vdsop, nr, ##args);	      	      \
      39  	if (!INTERNAL_SYSCALL_ERROR_P (sc_ret))			      	      \
      40  	  goto out;							      \
      41  	if (INTERNAL_SYSCALL_ERRNO (sc_ret) != ENOSYS)		      	      \
      42  	  goto iserr;							      \
      43        }									      \
      44  									      \
      45      sc_ret = INTERNAL_SYSCALL_CALL (name, ##args);		      	      \
      46      if (INTERNAL_SYSCALL_ERROR_P (sc_ret))			      	      \
      47        {									      \
      48        iserr:								      \
      49          __set_errno (INTERNAL_SYSCALL_ERRNO (sc_ret));		      	      \
      50          sc_ret = -1L;							      \
      51        }									      \
      52    out:									      \
      53      sc_ret;								      \
      54    })
      55  
      56  #endif /* SYSDEP_VDSO_LINUX_H  */