/* $NetBSD: __clone.S,v 1.6 2008/04/28 20:22:57 martin Exp $ */ /*- * Copyright (c) 2001 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jason R. Thorpe. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include <sys/errno.h> #include "SYS.h" #ifdef WEAK_ALIAS WEAK_ALIAS(clone, __clone) #endif /* * int __clone(int (*fn)(void *), void *stack, int flags, void *arg); */ ENTRY(__clone) save %sp, -CCFSZ, %sp /* * Sanity checks: func and stack may not be NULL. */ tst %i0 be 8f ! func == NULL, bail orcc %i1, %g0, %o1 ! setup stack arg for syscall, test be 8f ! stack == NULL, bail mov %i2, %o0 ! setup flags arg for syscall /* * Allocate "caller's" frame in the child stack as ABI * requires. * * We pass the function and the argument to the child by * stashing them at the bottom of the frame. There they are * safe from window spill would we need to take one as it's * below the window save area. */ sub %o1, CCFSZ, %o1 ! make space on the child's stack st %i0, [%o1+CCFSZ-8] ! save func st %i3, [%o1+CCFSZ-4] ! save arg /* * Args are now set up for system call as (flags, stack). */ mov SYS___clone, %g1 t ST_SYSCALL bcs 9f tst %o1 ! %o1 (rv[1]) == 0 in parent 1: bz 2f ! yes, parent ld [%sp+CCFSZ-8], %l0 ! grab the function... call %l0 ! Call the clone's entry point. ld [%sp+CCFSZ-4], %o0 ! ...and the argument from the stack CALL(_C_LABEL(_exit)) /* NOTREACHED */ 2: ret restore %g0, %o0, %o0 8: restore %g0, EINVAL, %o0 ERROR() /* NOTREACHED */ 9: restore %g0, %o0, %o0 ERROR() /* NOTREACHED */