1/* $NetBSD: __clone.S,v 1.5 2004/07/18 20:48:04 chs 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 Matt Fredette. 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39#include <sys/errno.h> 40#include "SYS.h" 41 42#ifdef WEAK_ALIAS 43 WEAK_ALIAS(clone, __clone) 44#endif 45 46 .import __cerror, code 47 48/* 49 * int clone(int (*fn)(void *), void *stack, int flags, void *arg); 50 */ 51ENTRY(__clone, 0) 52 53 /* 54 * Sanity checks: func and stack may not be NULL. 55 */ 56 ldi EINVAL, %t1 57 comb,= %r0, %arg0, __cerror 58 nop 59 comb,= %r0, %arg1, __cerror 60 nop 61 62 /* 63 * Put the func and arg arguments into a frame in the child's stack. 64 */ 65 ldo (HPPA_FRAME_SIZE * 2)(%arg1), %arg1 66 stw %arg0, HPPA_FRAME_ARG(0)(%arg1) 67 stw %arg3, HPPA_FRAME_ARG(1)(%arg1) 68 69 /* 70 * The system call expects (flags, stack). 71 */ 72 copy %arg2, %arg0 73 SYSCALL(__clone) 74 comb,<>,n %r0, %ret1, 9f 75 bv,n %r0(%rp) 76 779: /* 78 * Child: Reload the function and argument from the new stack. 79 */ 80 ldw HPPA_FRAME_ARG(0)(%sp), %r22 81 ldw HPPA_FRAME_ARG(1)(%sp), %arg0 82 83 /* Call the clone's entry point. */ 84 stw %r19, HPPA_FRAME_ARG(2)(%sp) 85 bl $$dyncall, %r31 86 copy %r31, %rp 87 ldw HPPA_FRAME_ARG(2)(%sp), %r19 88 89 /* Pass the return value to _exit(). */ 90 copy %ret0, %arg0 91 PIC_CALL(_exit) 92 93 /* NOTREACHED */ 94EXIT(__clone) 95