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/* Copyright (C) 2000-2016 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 _SIGNAL_H
#include <bits/signum.h>
#include <tcb-offsets.h>
/* The following are defined in linux/sched.h, which unfortunately */
/* is not safe for inclusion in an assembly file. */
#define CLONE_VM 0x00000100 /* set if VM shared between processes */
#define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
/* pid_t vfork(void); */
/* Implemented as __clone_syscall(CLONE_VFORK | CLONE_VM | SIGCHLD, 0) */
ENTRY (__libc_vfork)
.prologue // work around a GAS bug which triggers if
.body // first .prologue is not at the beginning of proc.
alloc r2=ar.pfs,0,0,2,0
adds r14=PID,r13
;;
ld4 r16=[r14]
;;
sub r15=0,r16
cmp.eq p6,p0=0,r16
;;
(p6) movl r15=0x80000000
mov out0=CLONE_VM+CLONE_VFORK+SIGCHLD
mov out1=0 /* Standard sp value. */
;;
st4 [r14]=r15
DO_CALL (SYS_ify (clone))
cmp.eq p6,p0=0,r8
adds r14=PID,r13
(p6) br.cond.dptk 1f
;;
ld4 r15=[r14]
;;
extr.u r16=r15,0,31
;;
cmp.eq p0,p6=0,r16
;;
(p6) sub r16=0,r15
;;
st4 [r14]=r16
1:
cmp.eq p6,p0=-1,r10
(p6) br.cond.spnt.few __syscall_error
ret
PSEUDO_END (__libc_vfork)
strong_alias (__libc_vfork, __vfork)
libc_hidden_def (__vfork)
weak_alias (__vfork, vfork)
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