sysdeps/unix/sysdep.h

   1 /* Copyright (C) 1991-2015 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <sysdeps/generic/sysdep.h>
  19
  20 #include <sys/syscall.h>
  21 #define HAVE_SYSCALLS
  22
  23 /* Note that using a `PASTE' macro loses.  */
  24 #define SYSCALL__(name, args)   PSEUDO (__##name, name, args)
  25 #define SYSCALL(name, args)     PSEUDO (name, name, args)
  26
  27 /* Machine-dependent sysdep.h files are expected to define the macro
  28    PSEUDO (function_name, syscall_name) to emit assembly code to define the
  29    C-callable function FUNCTION_NAME to do system call SYSCALL_NAME.
  30    r0 and r1 are the system call outputs.  MOVE(x, y) should be defined as
  31    an instruction such that "MOVE(r1, r0)" works.  ret should be defined
  32    as the return instruction.  */
  33
  34 #define SYS_ify(syscall_name) SYS_##syscall_name
  35
  36 /* Terminate a system call named SYM.  This is used on some platforms
  37    to generate correct debugging information.  */
  38 #ifndef PSEUDO_END
  39 #define PSEUDO_END(sym)
  40 #endif
  41 #ifndef PSEUDO_END_NOERRNO
  42 #define PSEUDO_END_NOERRNO(sym) PSEUDO_END(sym)
  43 #endif
  44 #ifndef PSEUDO_END_ERRVAL
  45 #define PSEUDO_END_ERRVAL(sym)  PSEUDO_END(sym)
  46 #endif
  47
  48 /* Wrappers around system calls should normally inline the system call code.
  49    But sometimes it is not possible or implemented and we use this code.  */
  50 #define INLINE_SYSCALL(name, nr, args...) __syscall_##name (args)