mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-23 11:20:07 +00:00
53ad957e4f
* sysdeps/unix/sysv/linux/i386/vfork.S: Add back the first implementation now that the syscall is back in 2.2.0.
67 lines
1.9 KiB
ArmAsm
67 lines
1.9 KiB
ArmAsm
/* Copyright (C) 1999 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Andreas Schwab <schwab@gnu.org>.
|
|
|
|
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>
|
|
#define _ERRNO_H 1
|
|
#include <bits/errno.h>
|
|
|
|
/* 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. */
|
|
|
|
ENTRY (__vfork)
|
|
|
|
#ifdef __NR_vfork
|
|
|
|
/* Pop the return PC value into ECX. */
|
|
popl %ecx
|
|
|
|
/* Stuff the syscall number in EAX and enter into the kernel. */
|
|
movl $SYS_ify (vfork), %eax
|
|
int $0x80
|
|
cmpl $-4095, %eax
|
|
jae .Lerror /* Branch forward if it failed. */
|
|
|
|
/* Jump to the return PC. */
|
|
jmp *%ecx
|
|
|
|
.Lerror:
|
|
/* Push back the return PC. */
|
|
pushl %ecx
|
|
|
|
/* Check if vfork syscall is known at all. */
|
|
cmpl $-ENOSYS, %eax
|
|
jne SYSCALL_ERROR_LABEL
|
|
|
|
#endif
|
|
|
|
/* If we don't have vfork, fork is close enough. */
|
|
|
|
movl $SYS_ify (fork), %eax
|
|
int $0x80
|
|
cmpl $-4095, %eax
|
|
jae SYSCALL_ERROR_LABEL
|
|
.Lpseudo_end:
|
|
ret
|
|
|
|
PSEUDO_END (__vfork)
|
|
|
|
weak_alias (__vfork, vfork)
|