|
Packit |
6c4009 |
/* Copyright (C) 1999-2018 Free Software Foundation, Inc.
|
|
Packit |
6c4009 |
This file is part of the GNU C Library.
|
|
Packit |
6c4009 |
Contributed by Philip Blundell <philb@gnu.org>.
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
The GNU C Library is free software; you can redistribute it and/or
|
|
Packit |
6c4009 |
modify it under the terms of the GNU Lesser General Public
|
|
Packit |
6c4009 |
License as published by the Free Software Foundation; either
|
|
Packit |
6c4009 |
version 2.1 of the License, or (at your option) any later version.
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
The GNU C Library is distributed in the hope that it will be useful,
|
|
Packit |
6c4009 |
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
Packit |
6c4009 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Packit |
6c4009 |
Lesser General Public License for more details.
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
You should have received a copy of the GNU Lesser General Public
|
|
Packit |
6c4009 |
License along with the GNU C Library. If not, see
|
|
Packit |
6c4009 |
<http://www.gnu.org/licenses/>. */
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
#include <sysdep.h>
|
|
Packit |
6c4009 |
#define _ERRNO_H 1
|
|
Packit |
6c4009 |
#include <bits/errno.h>
|
|
Packit |
6c4009 |
#include <tcb-offsets.h>
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Clone the calling process, but without copying the whole address space.
|
|
Packit |
6c4009 |
The calling process is suspended until the new process exits or is
|
|
Packit |
6c4009 |
replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
|
|
Packit |
6c4009 |
and the process ID of the new process to the old process. */
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
ENTRY (__vfork)
|
|
Packit |
6c4009 |
/* The DO_CALL macro saves r7 on the stack, to enable generation
|
|
Packit |
6c4009 |
of ARM unwind info. Since the stack is initially shared between
|
|
Packit |
6c4009 |
parent and child of vfork, that saved value could be corrupted.
|
|
Packit |
6c4009 |
To avoid this problem, we save r7 into ip as well, and restore
|
|
Packit |
6c4009 |
from there. */
|
|
Packit |
6c4009 |
mov ip, r7
|
|
Packit |
6c4009 |
cfi_register (r7, ip)
|
|
Packit |
6c4009 |
.fnstart
|
|
Packit |
6c4009 |
push { r7 }
|
|
Packit |
6c4009 |
cfi_adjust_cfa_offset (4)
|
|
Packit |
6c4009 |
.save { r7 }
|
|
Packit |
6c4009 |
ldr r7, =SYS_ify (vfork)
|
|
Packit |
6c4009 |
swi 0x0
|
|
Packit |
6c4009 |
.fnend
|
|
Packit |
6c4009 |
add sp, sp, #4
|
|
Packit |
6c4009 |
cfi_adjust_cfa_offset (-4)
|
|
Packit |
6c4009 |
mov r7, ip
|
|
Packit |
6c4009 |
cfi_restore (r7)
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
cmn a1, #4096
|
|
Packit |
6c4009 |
it cc
|
|
Packit |
6c4009 |
RETINSTR(cc, lr)
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
b PLTJMP(SYSCALL_ERROR)
|
|
Packit |
6c4009 |
PSEUDO_END (__vfork)
|
|
Packit |
6c4009 |
libc_hidden_def (__vfork)
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
weak_alias (__vfork, vfork)
|
|
Packit |
6c4009 |
strong_alias (__vfork, __libc_vfork)
|