mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-02 09:40:13 +00:00
8b9d605485
2004-02-09 Jakub Jelinek <jakub@redhat.com> * posix/Makefile (tests): Add tst-vfork2. * posix/tst-vfork1.c (do_test): Fix comment. * posix/tst-vfork2.c: New test.
69 lines
2.1 KiB
ArmAsm
69 lines
2.1 KiB
ArmAsm
/* Copyright (C) 1999, 2002, 2004 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 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>
|
|
#define _ERRNO_H 1
|
|
#include <bits/errno.h>
|
|
#include <kernel-features.h>
|
|
#include <tcb-offsets.h>
|
|
|
|
/* Save the PID value. */
|
|
#define SAVE_PID \
|
|
movl %gs:PID, %edx; \
|
|
movl %edx, %eax; \
|
|
negl %eax; \
|
|
movl %eax, %gs:PID
|
|
|
|
/* Restore the old PID value in the parent. */
|
|
#define RESTORE_PID \
|
|
testl %eax, %eax; \
|
|
je 1f; \
|
|
movl %edx, %gs:PID; \
|
|
1:
|
|
|
|
/* 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)
|
|
/* Pop the return PC value into ECX. */
|
|
popl %ecx
|
|
|
|
SAVE_PID
|
|
|
|
/* Stuff the syscall number in EAX and enter into the kernel. */
|
|
movl $SYS_ify (vfork), %eax
|
|
int $0x80
|
|
|
|
RESTORE_PID
|
|
|
|
/* Jump to the return PC. Don't jump directly since this
|
|
disturbs the branch target cache. Instead push the return
|
|
address back on the stack. */
|
|
pushl %ecx
|
|
|
|
cmpl $-4095, %eax
|
|
jae SYSCALL_ERROR_LABEL /* Branch forward if it failed. */
|
|
.Lpseudo_end:
|
|
ret
|
|
PSEUDO_END (__vfork)
|
|
|
|
weak_alias (__vfork, vfork)
|