1 /* Copyright (C) 1996 Free Software Foundation, Inc.
2 Contributed by Andreas Schwab (schwab@issan.informatik.uni-dortmund.de)
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If
16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
17 Cambridge, MA 02139, USA. */
19 /* clone is even more special than fork as it mucks with stacks
20 and invokes a function in the right context after its all over. */
26 /* int clone (int (*fn) (), void *child_stack, int flags, int nargs, ...) */
32 /* Sanity check arguments. */
34 movel 4(%sp), %a0 /* no NULL function pointers */
37 movel 8(%sp), %a1 /* no NULL stack pointers */
40 movel 16(%sp), %d1 /* no negative argument counts */
43 /* Allocate space on the new stack and copy args over */
46 lea (%a1,%d0.l*4), %a1
48 1: movel 16(%sp,%d1.l*4), -4(%a1,%d1.l*4)
53 /* Do the system call */
54 exg %d2, %a1 /* save %d2 and get stack pointer */
55 movel 12(%sp), %d1 /* get flags */
56 movel #SYS_ify (clone), %d0
58 exg %d2, %a1 /* restore %d2 */
69 subl %fp, %fp /* terminate the stack frame */
79 weak_alias (__clone, clone)