1/* $NetBSD: __clone.S,v 1.5 2013/07/16 23:00:15 matt Exp $ */ 2 3/*- 4 * Copyright (c) 2001 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Steve C. Woodford. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#include <sys/errno.h> 33#include "SYS.h" 34 35#ifdef WEAK_ALIAS 36WEAK_ALIAS(clone, __clone) 37#endif 38 39/* 40 * int clone(int (*fn)(void *), void *stack, int flags, void *arg); 41 */ 42ENTRY(__clone) 43 movl 4(%sp),%d0 /* NULL function pointer? */ 44 jeq 2f /* Yup, bomb out */ 45 movl %d0,%a1 46 movl 8(%sp),%d0 /* NULL stack? */ 47 jeq 2f /* Yup, bomb out */ 48 movl %d0,%a0 49 movl 16(%sp),-(%a0) /* Push clone's `arg' on its new stack */ 50 lea -12(%a0),%a0 /* Fake syscall args for the clone */ 51 movl %a0,-(%sp) /* Syscall arg: stack */ 52 movl 16(%sp),-(%sp) /* Syscall arg: flags */ 53 clrl -(%sp) /* Fake return address */ 54 SYSTRAP(__clone) /* Note: `fn' in (a1) is preserved */ 55 lea 12(%sp),%sp /* Zap syscall args */ 56 jcs 3f /* Punt if syscall failed */ 57 tstl %d0 58 jne 1f /* We're the parent, just return. */ 59 jsr (%a1) /* We're the clone, call the function */ 60 movl %d0,-(%sp) /* If clone returns, invoke _exit(3) */ 61 jbsr PIC_PLT(_C_LABEL(_exit)) 62 /* NOTREACHED */ 631: rts 642: movl #EINVAL,%d0 653: jbra CERROR 66END(__clone) 67