1*ce099b40Smartin/* $NetBSD: __clone.S,v 1.6 2008/04/28 20:22:57 martin Exp $ */ 2fdda2239Schristos 3fdda2239Schristos/*- 4fdda2239Schristos * Copyright (c) 2001 The NetBSD Foundation, Inc. 5fdda2239Schristos * All rights reserved. 6fdda2239Schristos * 7fdda2239Schristos * This code is derived from software contributed to The NetBSD Foundation 8fdda2239Schristos * by Jason R. Thorpe. 9fdda2239Schristos * 10fdda2239Schristos * Redistribution and use in source and binary forms, with or without 11fdda2239Schristos * modification, are permitted provided that the following conditions 12fdda2239Schristos * are met: 13fdda2239Schristos * 1. Redistributions of source code must retain the above copyright 14fdda2239Schristos * notice, this list of conditions and the following disclaimer. 15fdda2239Schristos * 2. Redistributions in binary form must reproduce the above copyright 16fdda2239Schristos * notice, this list of conditions and the following disclaimer in the 17fdda2239Schristos * documentation and/or other materials provided with the distribution. 18fdda2239Schristos * 19fdda2239Schristos * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20fdda2239Schristos * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21fdda2239Schristos * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22fdda2239Schristos * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23fdda2239Schristos * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24fdda2239Schristos * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25fdda2239Schristos * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26fdda2239Schristos * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27fdda2239Schristos * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28fdda2239Schristos * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29fdda2239Schristos * POSSIBILITY OF SUCH DAMAGE. 30fdda2239Schristos */ 31fdda2239Schristos 32fdda2239Schristos#include <sys/errno.h> 33fdda2239Schristos 34fdda2239Schristos#include "SYS.h" 35fdda2239Schristos 36fdda2239Schristos#ifdef WEAK_ALIAS 37fdda2239SchristosWEAK_ALIAS(clone, __clone) 38fdda2239Schristos#endif 39fdda2239Schristos 40fdda2239Schristos/* 41fdda2239Schristos * int __clone(int (*fn)(void *), void *stack, int flags, void *arg); 42fdda2239Schristos */ 43fdda2239SchristosENTRY(__clone) 4455a9a999Smartin save %sp, -CCFSZ, %sp 45fdda2239Schristos 46fdda2239Schristos /* 47fdda2239Schristos * Sanity checks: func and stack may not be NULL. 48fdda2239Schristos */ 49fdda2239Schristos tst %i0 50fdda2239Schristos be 8f ! func == NULL, bail 51fdda2239Schristos orcc %i1, %g0, %o1 ! setup stack arg for syscall, test 52fdda2239Schristos be 8f ! stack == NULL, bail 53fdda2239Schristos mov %i2, %o0 ! setup flags arg for syscall 54fdda2239Schristos 55fdda2239Schristos /* 561c4ebce5Smartin * Allocate "caller's" frame in the child stack as ABI 571c4ebce5Smartin * requires. 581c4ebce5Smartin * 591c4ebce5Smartin * We pass the function and the argument to the child by 601c4ebce5Smartin * stashing them at the bottom of the frame. There they are 611c4ebce5Smartin * safe from window spill would we need to take one as it's 621c4ebce5Smartin * below the window save area. 63fdda2239Schristos */ 641c4ebce5Smartin sub %o1, CCFSZ, %o1 ! make space on the child's stack 651c4ebce5Smartin st %i0, [%o1+CCFSZ-8] ! save func 661c4ebce5Smartin st %i3, [%o1+CCFSZ-4] ! save arg 67fdda2239Schristos 68fdda2239Schristos /* 69fdda2239Schristos * Args are now set up for system call as (flags, stack). 70fdda2239Schristos */ 71fdda2239Schristos mov SYS___clone, %g1 72fdda2239Schristos t ST_SYSCALL 739ee271adSmartin bcs 9f 74fdda2239Schristos tst %o1 ! %o1 (rv[1]) == 0 in parent 75fdda2239Schristos 76fdda2239Schristos1: bz 2f ! yes, parent 771c4ebce5Smartin ld [%sp+CCFSZ-8], %l0 ! grab the function... 78fdda2239Schristos call %l0 ! Call the clone's entry point. 791c4ebce5Smartin ld [%sp+CCFSZ-4], %o0 ! ...and the argument from the stack 80fdda2239Schristos 81fdda2239Schristos CALL(_C_LABEL(_exit)) 82fdda2239Schristos /* NOTREACHED */ 83fdda2239Schristos 84fdda2239Schristos2: ret 85fdda2239Schristos restore %g0, %o0, %o0 86fdda2239Schristos 87ce5186b5Smartin8: restore %g0, EINVAL, %o0 88ce5186b5Smartin ERROR() 89ce5186b5Smartin /* NOTREACHED */ 90ce5186b5Smartin 91ce5186b5Smartin9: restore %g0, %o0, %o0 92ce5186b5Smartin ERROR() 93ce5186b5Smartin /* NOTREACHED */ 94