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/*
* Copyright (C) 2016-2017 Andes Technology, Inc.
* Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
*/
/* Copyright (C) 1999, 2002, 2003 Free Software Foundation, Inc.
Contributed by Philip Blundell <philb@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>
/* 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 PIC
.pic
#endif
#ifdef __NR_vfork
syscall __NR_vfork
bltz $r0, 2f
1:
ret
2:
sltsi $r1, $r0, -4096
bnez $r1, 1b;
# ifdef __ASSUME_VFORK_SYSCALL
# ifdef PIC
pushm $gp, $lp
cfi_adjust_cfa_offset(8)
cfi_rel_offset(gp, 0)
cfi_rel_offset(lp, 4)
mfusr $r15, $PC
sethi $gp, hi20(_GLOBAL_OFFSET_TABLE_+4)
ori $gp, $gp, lo12(_GLOBAL_OFFSET_TABLE_+8)
add $gp, $gp, $r15
! r15=C_SYMBOL_NAME(__syscall_error)@PLT
sethi $r15, hi20(C_SYMBOL_NAME(__syscall_error)@PLT)
ori $r15, $r15, lo12(C_SYMBOL_NAME(__syscall_error)@PLT)
add $r15, $r15, $gp
! jump to SYSCALL_ERROR
jral $r15
popm $gp, $lp
cfi_adjust_cfa_offset(-8)
cfi_restore(lp)
cfi_restore(gp)
ret
# else
j C_SYMBOL_NAME(__syscall_error)
# endif
# else
/* Check if vfork syscall is known at all. */
li $r1, -ENOSYS
beq $r0, $r1, 1f
# ifdef PIC
3:
pushm $gp, $lp
cfi_adjust_cfa_offset(8)
cfi_rel_offset(gp, 0)
cfi_rel_offset(lp, 4)
mfusr $r15, $PC
sethi $gp, hi20(_GLOBAL_OFFSET_TABLE_+4)
ori $gp, $gp, lo12(_GLOBAL_OFFSET_TABLE_+8)
add $gp, $gp, $r15
! r15=C_SYMBOL_NAME(__syscall_error)@PLT
sethi $r15, hi20(C_SYMBOL_NAME(__syscall_error)@PLT)
ori $r15, $r15, lo12(C_SYMBOL_NAME(__syscall_error)@PLT)
add $r15, $r15, $gp
! jump to SYSCALL_ERROR
jral $r15
popm $gp, $lp
cfi_adjust_cfa_offset(-8)
cfi_restore(lp)
cfi_restore(gp)
ret
# else
j C_SYMBOL_NAME(__syscall_error)
# endif
1:
# endif
#endif
#ifndef __ASSUME_VFORK_SYSCALL
/* If we don't have vfork, fork is close enough. */
syscall __NR_fork
bgez $r0, 1f
sltsi $r1, $r0, -4096
bnez $r1, 1f
# ifdef PIC
b 3b
# else
j C_SYMBOL_NAME(__syscall_error)
# endif
1:
ret
#elif !defined __NR_vfork
# error "__NR_vfork not available and __ASSUME_VFORK_SYSCALL defined"
#endif
PSEUDO_END (__vfork)
weak_alias (__vfork, vfork)
libc_hidden_def (vfork)
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