1 /* Copyright (C) 1996, 1997, 1998, 1999, 2002, 2005, 2008, 2009, 2010
2 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Pat Beirne <patb@corelcomputer.com>
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
21 /* clone() is even more special than fork() as it mucks with stacks
22 and invokes a function in the right context after its all over. */
26 #include <bits/errno.h>
28 #define CLONE_VM 0x00000100
29 #define CLONE_THREAD 0x00010000
31 /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
32 pid_t *ptid, struct user_desc *tls, pid_t *ctid); */
40 beq PLTJMP(syscall_error)
42 @ insert the args onto the new stack
52 @ new sp is already in r1
55 cfi_adjust_cfa_offset (8)
56 cfi_rel_offset (r4, 0)
57 cfi_rel_offset (r7, 4)
60 cfi_adjust_cfa_offset (8)
61 cfi_rel_offset (r4, 0)
67 ldr r7, =SYS_ify(clone)
80 blt PLTJMP(C_SYMBOL_NAME(__syscall_error))
96 ldr r7, =SYS_ify(getpid)
101 str r0, [r1, #PID_OFFSET]
102 str r0, [r1, #TID_OFFSET]
105 @ pick the function arg and call address off the stack and execute
107 #if defined(__ARM_ARCH_4T__) && defined(__THUMB_INTERWORK__)
116 @ and we are done, passing the return value through r0
117 b PLTJMP(HIDDEN_JUMPTARGET(_exit))
121 weak_alias (__clone, clone)