1 /* Copyright (C) 2000, 2001, 2004 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
20 /* clone is even more special than fork as it mucks with stacks
21 and invokes a function in the right context after its all over. */
26 #include <bits/errno.h>
28 /* int __clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
29 pid_t *parent_tid, void *tls, pid_t *child_tid); */
30 /* sys_clone (void *child_stack, unsigned long flags,
31 pid_t *parent_tid, pid_t *child_tid, void *tls); */
35 st %r6,24(%r15) /* store %r6 to save area */
37 lr %r0,%r5 /* move *arg out of the way */
38 ltr %r1,%r2 /* check fn and move to %r1 */
39 jz error /* no NULL function pointers */
40 ltr %r2,%r3 /* check child_stack and move to %r2 */
41 jz error /* no NULL stack pointers */
42 lr %r3,%r4 /* move flags to %r3 */
43 lr %r4,%r6 /* move parent_tid to %r4 */
44 l %r5,100(%r15) /* load child_tid from stack */
45 l %r6,96(%r15) /* load tls from stack */
47 ltr %r2,%r2 /* check return code */
49 l %r6,24(%r15) /* restore %r6 */
50 jm SYSCALL_ERROR_LABEL
59 tmh %r3,1 /* CLONE_THREAD == 0x00010000 */
62 tml %r3,256 /* CLONE_VM == 0x00000100 */
70 /* fn is in gpr 1, arg in gpr 0 */
71 lr %r2,%r0 /* set first parameter to void *arg */
72 ahi %r15,-96 /* make room on the stack for the save area */
74 basr %r14,%r1 /* jump to fn */
76 weak_alias (__clone, clone)