1 /* Copyright (C) 1999, 2000, 2003, 2004, 2007 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the 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 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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. */
23 #include <asm/unistd.h>
26 #include <bits/errno.h>
28 #include <tcb-offsets.h>
30 /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
31 pid_t *ptid, void *tls, pid_t *ctid); */
35 /* sanity check arguments. */
44 /* insert the args onto the new stack */
46 /* save the function pointer as the 0th element */
49 /* do the system call */
54 mov #+SYS_ify(clone), r3
59 not r1, r1 // r1=0 means r0 = -1 to -4095
60 tst r1, r1 // i.e. error in linux
71 /* terminate the stack frame */
76 tst #1, r0 // CLONE_THREAD = (1 << 16)
81 tst #1, r0 // CLONE_VM = (1 << 8)
84 mov #+SYS_ify(getpid), r3
101 /* we are done, passing the return value through r0 */
124 .long _GLOBAL_OFFSET_TABLE_
126 .long PLTJMP(C_SYMBOL_NAME(_exit))
130 .long C_SYMBOL_NAME(_exit)
134 .word PID - TLS_PRE_TCB_SIZE
136 .word TID - TLS_PRE_TCB_SIZE
140 weak_alias (__clone, clone)