mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-27 23:40:10 +00:00
65 lines
2.0 KiB
ArmAsm
65 lines
2.0 KiB
ArmAsm
/* Copyright (C) 2003-2016 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, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <sysdep.h>
|
|
#define _ERRNO_H 1
|
|
#include <bits/errno.h>
|
|
#include <tcb-offsets.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)
|
|
|
|
/* Load the TCB-cached PID value and negates it. If It it is zero
|
|
sets it to 0x800000. And then sets its value again on TCB field.
|
|
See raise.c for the logic that relies on this value. */
|
|
|
|
lwz r0,PID(r2)
|
|
cmpwi cr0,r0,0
|
|
neg r0,r0
|
|
bne- cr0,1f
|
|
lis r0,0x8000
|
|
1: stw r0,PID(r2)
|
|
|
|
DO_CALL (SYS_ify (vfork))
|
|
|
|
cmpwi cr1,r3,0
|
|
beqlr- 1
|
|
|
|
/* Restore the original value of the TCB cache of the PID, if we're
|
|
the parent. But in the child (syscall return value equals zero),
|
|
leave things as they are. */
|
|
lwz r0,PID(r2)
|
|
/* Cannot use clrlwi. here, because cr0 needs to be preserved
|
|
until PSEUDO_RET. */
|
|
clrlwi r4,r0,1
|
|
cmpwi cr1,r4,0
|
|
beq- cr1,1f
|
|
neg r4,r0
|
|
1: stw r4,PID(r2)
|
|
|
|
PSEUDO_RET
|
|
|
|
PSEUDO_END (__vfork)
|
|
libc_hidden_def (__vfork)
|
|
|
|
weak_alias (__vfork, vfork)
|
|
strong_alias (__vfork, __libc_vfork)
|