sysdeps/unix/bsd/bsd4.4/kfreebsd/i386/sys_fork.S

   1 /* Copyright (C) 1991-1992, 1994-1995, 1997, 2002 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 <sysdep.h>
  20
  21 .text;
  22 ENTRY (__syscall_fork)
  23         DO_CALL (fork, 0)
  24         jb SYSCALL_ERROR_LABEL;
  25         /* R1 is now 0 for the parent and 1 for the child.  Decrement it to
  26            make it -1 (all bits set) for the parent, and 0 (no bits set)
  27            for the child.  Then AND it with R0, so the parent gets
  28            R0&-1==R0, and the child gets R0&0==0.  */
  29         decl r1
  30         andl r1, r0
  31 L(pseudo_end):
  32         ret
  33 PSEUDO_END (__syscall_fork)
  34 libc_hidden_def (__syscall_fork)