sysdeps/unix/sysdep.h

   1 /* Copyright (C) 1991, 92, 93, 96, 98, 2003 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <sysdeps/generic/sysdep.h>
  20
  21 #include <sys/syscall.h>
  22 #define HAVE_SYSCALLS
  23
  24 /* Note that using a `PASTE' macro loses.  */
  25 #ifdef  __STDC__
  26 #define SYSCALL__(name, args)   PSEUDO (__##name, name, args)
  27 #else
  28 #define SYSCALL__(name, args)   PSEUDO (__/**/name, name, args)
  29 #endif
  30 #define SYSCALL(name, args)     PSEUDO (name, name, args)
  31
  32 /* Machine-dependent sysdep.h files are expected to define the macro
  33    PSEUDO (function_name, syscall_name) to emit assembly code to define the
  34    C-callable function FUNCTION_NAME to do system call SYSCALL_NAME.
  35    r0 and r1 are the system call outputs.  MOVE(x, y) should be defined as
  36    an instruction such that "MOVE(r1, r0)" works.  ret should be defined
  37    as the return instruction.  */
  38
  39 #ifdef __STDC__
  40 #define SYS_ify(syscall_name) SYS_##syscall_name
  41 #else
  42 #define SYS_ify(syscall_name) SYS_/**/syscall_name
  43 #endif
  44
  45 /* Terminate a system call named SYM.  This is used on some platforms
  46    to generate correct debugging information.  */
  47 #ifndef PSEUDO_END
  48 #define PSEUDO_END(sym)
  49 #endif
  50 #ifndef PSEUDO_END_NOERRNO
  51 #define PSEUDO_END_NOERRNO(sym) PSEUDO_END(sym)
  52 #endif
  53 #ifndef PSEUDO_END_ERRVAL
  54 #define PSEUDO_END_ERRVAL(sym)  PSEUDO_END(sym)
  55 #endif
  56
  57 /* Wrappers around system calls should normally inline the system call code.
  58    But sometimes it is not possible or implemented and we use this code.  */
  59 #define INLINE_SYSCALL(name, nr, args...) __syscall_##name (args)