/* * 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 <sched.h> #include <errno.h> #include <sys/syscall.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 .Lxxx;" /* 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 */ ".Lxxx: 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 .Lxxx;" /* if (rval != 0) skip to parent */ "r0 = %4;" "p0 = %5;" "fp = 0;" "call (p0);" /* Call cloned function */ "p0 = %6;" "excpt 0;" /* Call sys_exit */ ".Lxxx: nop;" : "=d" (rval) : "i" (__NR_clone), "a" (child_stack), "a" (flags), "a" (arg), "a" (fn), "i" (__NR_exit) : "CC", "R0", "R1", "P0"); #endif } else { __set_errno(EINVAL); } return rval; }