| /* Copyright (C) 1993, 1994, 1995, 1997, 2002 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, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <sysdep.h> |
| |
| /* Since vfork shares the address space between the parent and child, |
| we must take care to avoid the child unwinding the stack frame and |
| clobbering it for the parent. */ |
| |
| .text |
| ENTRY (__vfork) |
| popl scratch /* Save the return PC in a register. */ |
| DO_CALL (vfork, 0) /* Do the system call. */ |
| pushl scratch /* Put the return PC back on the stack. */ |
| jb syscall_error /* Branch if error. */ |
| /* R1 is now 0 for the parent and 1 for the child. Decrement it to |
| make it -1 (all bits set) for the parent, and 0 (no bits set) |
| for the child. Then AND it with R0, so the parent gets |
| R0&-1==R0, and the child gets R0&0==0. */ |
| decl r1 |
| andl r1, r0 |
| ret |
| libc_hidden_def (__vfork) |
| |
| weak_alias (__vfork, vfork) |
