__clone.S revision 1.1.2.2
1 1.1.2.2 nathanw /* $NetBSD: __clone.S,v 1.1.2.2 2001/10/08 20:18:28 nathanw Exp $ */ 2 1.1.2.2 nathanw 3 1.1.2.2 nathanw /*- 4 1.1.2.2 nathanw * Copyright (c) 2001 The NetBSD Foundation, Inc. 5 1.1.2.2 nathanw * All rights reserved. 6 1.1.2.2 nathanw * 7 1.1.2.2 nathanw * This code is derived from software contributed to The NetBSD Foundation 8 1.1.2.2 nathanw * by Jason R. Thorpe. 9 1.1.2.2 nathanw * 10 1.1.2.2 nathanw * Redistribution and use in source and binary forms, with or without 11 1.1.2.2 nathanw * modification, are permitted provided that the following conditions 12 1.1.2.2 nathanw * are met: 13 1.1.2.2 nathanw * 1. Redistributions of source code must retain the above copyright 14 1.1.2.2 nathanw * notice, this list of conditions and the following disclaimer. 15 1.1.2.2 nathanw * 2. Redistributions in binary form must reproduce the above copyright 16 1.1.2.2 nathanw * notice, this list of conditions and the following disclaimer in the 17 1.1.2.2 nathanw * documentation and/or other materials provided with the distribution. 18 1.1.2.2 nathanw * 3. All advertising materials mentioning features or use of this software 19 1.1.2.2 nathanw * must display the following acknowledgement: 20 1.1.2.2 nathanw * This product includes software developed by the NetBSD 21 1.1.2.2 nathanw * Foundation, Inc. and its contributors. 22 1.1.2.2 nathanw * 4. Neither the name of The NetBSD Foundation nor the names of its 23 1.1.2.2 nathanw * contributors may be used to endorse or promote products derived 24 1.1.2.2 nathanw * from this software without specific prior written permission. 25 1.1.2.2 nathanw * 26 1.1.2.2 nathanw * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 1.1.2.2 nathanw * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 1.1.2.2 nathanw * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 1.1.2.2 nathanw * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 1.1.2.2 nathanw * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 1.1.2.2 nathanw * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 1.1.2.2 nathanw * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 1.1.2.2 nathanw * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 1.1.2.2 nathanw * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 1.1.2.2 nathanw * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 1.1.2.2 nathanw * POSSIBILITY OF SUCH DAMAGE. 37 1.1.2.2 nathanw */ 38 1.1.2.2 nathanw 39 1.1.2.2 nathanw #include <sys/errno.h> 40 1.1.2.2 nathanw 41 1.1.2.2 nathanw #include "SYS.h" 42 1.1.2.2 nathanw 43 1.1.2.2 nathanw #ifdef WEAK_ALIAS 44 1.1.2.2 nathanw WEAK_ALIAS(clone, __clone) 45 1.1.2.2 nathanw #endif 46 1.1.2.2 nathanw 47 1.1.2.2 nathanw /* 48 1.1.2.2 nathanw * int __clone(int (*fn)(void *), void *stack, int flags, void *arg); 49 1.1.2.2 nathanw */ 50 1.1.2.2 nathanw ENTRY(__clone) 51 1.1.2.2 nathanw save %sp, -176, %sp 52 1.1.2.2 nathanw 53 1.1.2.2 nathanw /* 54 1.1.2.2 nathanw * Sanity checks: func and stack may not be NULL. 55 1.1.2.2 nathanw */ 56 1.1.2.2 nathanw tst %i0 57 1.1.2.2 nathanw be 8f ! func == NULL, bail 58 1.1.2.2 nathanw orcc %i1, %g0, %o1 ! setup stack arg for syscall, test 59 1.1.2.2 nathanw be 8f ! stack == NULL, bail 60 1.1.2.2 nathanw mov %i2, %o0 ! setup flags arg for syscall 61 1.1.2.2 nathanw 62 1.1.2.2 nathanw /* 63 1.1.2.2 nathanw * Store the function and the argument on our child's stack 64 1.1.2.2 nathanw */ 65 1.1.2.2 nathanw sub %o1, 16, %o1 ! make space on the child's stack 66 1.1.2.2 nathanw stx %i0, [%o1] ! save func 67 1.1.2.2 nathanw stx %i3, [%o1+8] ! save arg 68 1.1.2.2 nathanw 69 1.1.2.2 nathanw /* 70 1.1.2.2 nathanw * Args are now set up for system call as (flags, stack). 71 1.1.2.2 nathanw */ 72 1.1.2.2 nathanw mov SYS___clone, %g1 73 1.1.2.2 nathanw t ST_SYSCALL 74 1.1.2.2 nathanw be 9f 75 1.1.2.2 nathanw tst %o1 ! %o1 (rv[1]) == 0 in parent 76 1.1.2.2 nathanw 77 1.1.2.2 nathanw 1: bz 2f ! yes, parent 78 1.1.2.2 nathanw ldx [%sp], %l0 ! grab the function 79 1.1.2.2 nathanw ldx [%sp+8], %o0 ! and the argument from the stack 80 1.1.2.2 nathanw add %sp, 16, %sp ! restore the stack 81 1.1.2.2 nathanw call %l0 ! Call the clone's entry point. 82 1.1.2.2 nathanw nop 83 1.1.2.2 nathanw 84 1.1.2.2 nathanw CALL(_C_LABEL(_exit)) 85 1.1.2.2 nathanw /* NOTREACHED */ 86 1.1.2.2 nathanw 87 1.1.2.2 nathanw 2: ret 88 1.1.2.2 nathanw restore %g0, %o0, %o0 89 1.1.2.2 nathanw 90 1.1.2.2 nathanw 8: mov EINVAL, %o0 91 1.1.2.2 nathanw 9: ERROR() 92 1.1.2.2 nathanw mov -1, %i0 93 1.1.2.2 nathanw ret 94 1.1.2.2 nathanw restore %g0, -1, %o0 95
Indexes created Thu Oct 02 14:10:14 GMT 2025