57 lines
1.7 KiB
ArmAsm
57 lines
1.7 KiB
ArmAsm
/* Copyright (C) 1991, 1992, 1995, 1997 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 Library General Public License as
|
|
published by the Free Software Foundation; either version 2 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
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. 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 the calling process is suspended until the 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:
|
|
.word 0
|
|
/* Save our return address in R2, and return to code below. */
|
|
movl 16(fp), r2
|
|
movab unwind, 16(fp)
|
|
ret
|
|
unwind:
|
|
/* Do the system call. */
|
|
chmk $SYS_vfork
|
|
bcs error
|
|
|
|
tstl r1
|
|
beq parent
|
|
|
|
/* We are the child. Return zero. */
|
|
clrl r0
|
|
|
|
/* Return to the saved address. */
|
|
parent: jmp (r2)
|
|
|
|
.globl _errno
|
|
error:
|
|
movl r0, _errno
|
|
mnegl $1, r0
|
|
jmp (r2)
|
|
|
|
weak_alias (__vfork, vfork)
|