1 /*
2 * libc/sysdeps/linux/bfin/clone.c -- `clone' syscall for linux/blackfin
3 *
4 * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
5 *
6 * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
7 */
8
9 #include <sched.h>
10 #include <errno.h>
11 #include <sys/syscall.h>
12
13 int
clone(int (* fn)(void * arg),void * child_stack,int flags,void * arg,...)14 clone (int (*fn)(void *arg), void *child_stack, int flags, void *arg, ...)
15 {
16 long rval = -1;
17
18 if (fn && child_stack) {
19
20 __asm__ __volatile__ (
21 "excpt 0;" /* Call sys_clone */
22 "cc = r0 == 0;"
23 "if !cc jump 1f;" /* if (rval != 0) skip to parent */
24 "r0 = %4;"
25 "p0 = %5;"
26 "fp = 0;"
27 #ifdef __BFIN_FDPIC__
28 "p1 = [p0];"
29 "p3 = [p0 + 4];"
30 "call (p1);" /* Call cloned function */
31 #else
32 "call (p0);" /* Call cloned function */
33 #endif
34 "p0 = %6;"
35 "excpt 0;" /* Call sys_exit */
36 "1: nop;"
37 : "=q0" (rval)
38 : "qA" (__NR_clone), "q1" (child_stack), "q0" (flags), "a" (arg), "a" (fn), "i" (__NR_exit)
39 : "CC");
40
41 } else
42 __set_errno(EINVAL);
43
44 return rval;
45 }
46