65 lines
1.9 KiB
ArmAsm
65 lines
1.9 KiB
ArmAsm
/* Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
|
|
Contributed by Andreas Schwab (schwab@issan.informatik.uni-dortmund.de)
|
|
|
|
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. */
|
|
|
|
/* clone is even more special than fork as it mucks with stacks
|
|
and invokes a function in the right context after its all over. */
|
|
|
|
#include <sysdep.h>
|
|
#define _ERRNO_H 1
|
|
#include <bits/errno.h>
|
|
|
|
/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */
|
|
|
|
.text
|
|
ENTRY (__clone)
|
|
|
|
/* Sanity check arguments. */
|
|
movel #-EINVAL, %d0
|
|
movel 4(%sp), %a0 /* no NULL function pointers */
|
|
tstl %a0
|
|
jeq SYSCALL_ERROR_LABEL
|
|
movel 8(%sp), %a1 /* no NULL stack pointers */
|
|
tstl %a1
|
|
jeq SYSCALL_ERROR_LABEL
|
|
|
|
/* Allocate space and copy the argument onto the new stack. */
|
|
movel 16(%sp), -(%a1)
|
|
|
|
/* Do the system call */
|
|
exg %d2, %a1 /* save %d2 and get stack pointer */
|
|
movel 12(%sp), %d1 /* get flags */
|
|
movel #SYS_ify (clone), %d0
|
|
trap #0
|
|
exg %d2, %a1 /* restore %d2 */
|
|
|
|
tstl %d0
|
|
jmi SYSCALL_ERROR_LABEL
|
|
jeq thread_start
|
|
|
|
rts
|
|
|
|
thread_start:
|
|
subl %fp, %fp /* terminate the stack frame */
|
|
jsr (%a0)
|
|
movel %d0, -(%sp)
|
|
jbsr JUMPTARGET (_exit)
|
|
|
|
PSEUDO_END (__clone)
|
|
|
|
weak_alias (__clone, clone)
|