/* $NetBSD: __clone.S,v 1.2 2003/11/13 06:29:39 simonb Exp $ */ /*- * Copyright (c) 2001 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Steve C. Woodford. * * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * 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 #include "SYS.h" #ifdef WEAK_ALIAS WEAK_ALIAS(clone,__clone) #endif /* * int __clone(int (*fn)(void *), void *stack, int flags, void *arg); */ ENTRY(__clone) movd S_ARG0,r2 cmpqd 0,r2 /* NULL function pointer? */ beq 2f /* Yup, bomb out */ movd S_ARG1,r0 cmpqd 0,r0 /* NULL stack? */ beq 2f /* Yup, bomb out */ movd S_ARG3,-4(r0) /* "Push" clone's `arg' on its new stack */ addr -16(r0),tos /* Syscall arg: stack */ /* (-16 because of faked syscall */ /* args and the "push") */ movd S_ARG3,tos /* Syscall arg: flags */ movqd 0,tos /* Fake return address */ SYSTRAP(__clone) /* Note: `fn' in r2 is preserved */ adjspd -12 /* Zap syscall args */ bcs _ASM_LABEL(cerror)/* Punt if syscall failed */ cmpqd 0,r0 bne 1f /* We're the parent, just return. */ lprd fp,0 /* Clear framepointer */ jsr 0(r2) /* We're the clone, call the function */ movd r0,tos /* If clone returns, invoke _exit(3) */ bsr _C_LABEL(_exit) /* NOTREACHED */ 1: ret 0 2: movd EINVAL,r0 br _ASM_LABEL(cerror)