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/*
* libc/sysdeps/linux/nios2/clone.c -- `clone' syscall for linux/nios2
*
* Copyright (C) 2004,05 Microtronix Datacom Ltd
* Copyright (C) 2002,03 NEC Electronics Corporation
* Copyright (C) 2002,03 Miles Bader <miles@gnu.org>
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License. See the file COPYING.LIB in the main
* directory of this archive for more details.
*
* Written by Miles Bader <miles@gnu.org>
* Nios2 port by Wentao Xu
*/
#include <errno.h>
#include <sys/syscall.h>
int clone (int (*fn)(void *arg), void *child_stack, int flags, void *arg)
{
register unsigned long rval asm ("r2") = -EINVAL;
if (fn && child_stack) {
register unsigned long syscall asm ("r3");
register unsigned long arg0 asm ("r4");
register unsigned long arg1 asm ("r5");
/* Clone this thread. */
rval = TRAP_ID_SYSCALL;
syscall = __NR_clone;
arg0 = flags;
arg1 = (unsigned long)child_stack;
asm volatile ("trap "
: "=r" (rval), "=r" (syscall)
: "0" (rval),"1" (syscall), "r" (arg0), "r" (arg1)
);
if (rval == 0) {
/* In child thread, call fn and exit. */
arg0 = (*fn) (arg);
syscall = __NR_exit;
asm volatile ("trap "
: "=r" (rval), "=r" (syscall)
: "1" (syscall), "r" (arg0));
}
}
__syscall_return (int, rval);
}
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