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/*
* libc/sysdeps/linux/bfin/clone.c -- `clone' syscall for linux/blackfin
*
* Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
*
* Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
*/
#include <asm/unistd.h>
int
clone (int (*fn)(void *arg), void *child_stack, int flags, void *arg)
{
register long rval = -1;
if (fn && child_stack) {
#ifdef __BFIN_FDPIC__
__asm__ __volatile__ (
"r1 = %2;"
"r0 = %3;"
"P0 = %1;"
"excpt 0;" /*Call sys_clone*/
"%0 = r0;"
"cc = r0 == 0;"
"if !cc jump xxx;" /* if (rval != 0) skip to parent */
"r0 = %4;"
"p0 = %5;"
"fp = 0;"
"p1 = [p0];"
"p3 = [p0 + 4];"
"call (p1);" /* Call cloned function */
"p0 = %6;"
"excpt 0;" /* Call sys_exit */
"xxx: nop;"
: "=d" (rval)
: "i" (__NR_clone), "a" (child_stack), "a" (flags), "a" (arg), "a" (fn), "i" (__NR_exit)
: "CC", "R0", "R1", "P0");
#else
__asm__ __volatile__ (
"r1 = %2;"
"r0 = %3;"
"P0 = %1;"
"excpt 0;" /*Call sys_clone*/
"%0 = r0;"
"cc = r0 == 0;"
"if !cc jump xxx;" /* if (rval != 0) skip to parent */
"r0 = %4;"
"p0 = %5;"
"fp = 0;"
"call (p0);" /* Call cloned function */
"p0 = %6;"
"excpt 0;" /* Call sys_exit */
"xxx: nop;"
: "=d" (rval)
: "i" (__NR_clone), "a" (child_stack), "a" (flags), "a" (arg), "a" (fn), "i" (__NR_exit)
: "CC", "R0", "R1", "P0");
#endif
}
return rval;
}
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