diff options
Diffstat (limited to 'sysdeps/unix/bsd/sun/m68k/vfork.S')
-rw-r--r-- | sysdeps/unix/bsd/sun/m68k/vfork.S | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/sysdeps/unix/bsd/sun/m68k/vfork.S b/sysdeps/unix/bsd/sun/m68k/vfork.S new file mode 100644 index 0000000..cf9e2e9 --- /dev/null +++ b/sysdeps/unix/bsd/sun/m68k/vfork.S @@ -0,0 +1,56 @@ +/* Copyright (C) 1991, 92, 93, 94, 95, 97, 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> + +#ifndef SYS_vfork +#define SYS_vfork 66 +#endif + +/* Clone the calling process, but without copying the whole address space. + The calling process is suspended until the new process exits or is + replaced by a call to `execve'. Return -1 for errors, 0 to the new process, + and the process ID of the new process to the old process. */ +.globl ___vfork +___vfork: + /* Pop the return PC value into A0. */ + movel sp@+, a0 + + /* Push the syscall number and trap into the kernel. */ + movel #SYS_vfork, sp@- + trap #0 + bcs error /* Branch forward if it failed. */ + + /* It succeeded. See which fork we're in. D1 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 D0, so the parent gets D0&-1==R0, and the child + gets D0&0==0. */ + subql #1, d1 + andl d1, d0 + + /* Jump to the return PC. */ + jmp a0@ + +error: + movel d0, _errno + moveq #-1, d0 + jmp a0@ +libc_hidden_def (__vfork) + +weak_alias (__vfork, vfork) |