__clone.S revision 1.7.8.2
1 1.7.8.2 martin /* $NetBSD: __clone.S,v 1.7.8.2 2008/04/28 20:22:58 martin Exp $ */ 2 1.7.8.2 martin 3 1.7.8.2 martin /*- 4 1.7.8.2 martin * Copyright (c) 2001 The NetBSD Foundation, Inc. 5 1.7.8.2 martin * All rights reserved. 6 1.7.8.2 martin * 7 1.7.8.2 martin * This code is derived from software contributed to The NetBSD Foundation 8 1.7.8.2 martin * by Jason R. Thorpe. 9 1.7.8.2 martin * 10 1.7.8.2 martin * Redistribution and use in source and binary forms, with or without 11 1.7.8.2 martin * modification, are permitted provided that the following conditions 12 1.7.8.2 martin * are met: 13 1.7.8.2 martin * 1. Redistributions of source code must retain the above copyright 14 1.7.8.2 martin * notice, this list of conditions and the following disclaimer. 15 1.7.8.2 martin * 2. Redistributions in binary form must reproduce the above copyright 16 1.7.8.2 martin * notice, this list of conditions and the following disclaimer in the 17 1.7.8.2 martin * documentation and/or other materials provided with the distribution. 18 1.7.8.2 martin * 19 1.7.8.2 martin * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.7.8.2 martin * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.7.8.2 martin * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.7.8.2 martin * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.7.8.2 martin * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.7.8.2 martin * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.7.8.2 martin * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.7.8.2 martin * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.7.8.2 martin * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.7.8.2 martin * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.7.8.2 martin * POSSIBILITY OF SUCH DAMAGE. 30 1.7.8.2 martin */ 31 1.7.8.2 martin 32 1.7.8.2 martin #include <sys/errno.h> 33 1.7.8.2 martin 34 1.7.8.2 martin #include "SYS.h" 35 1.7.8.2 martin 36 1.7.8.2 martin #ifdef WEAK_ALIAS 37 1.7.8.2 martin WEAK_ALIAS(clone, __clone) 38 1.7.8.2 martin #endif 39 1.7.8.2 martin 40 1.7.8.2 martin /* 41 1.7.8.2 martin * int __clone(int (*fn)(void *), void *stack, int flags, void *arg); 42 1.7.8.2 martin */ 43 1.7.8.2 martin ENTRY(__clone) 44 1.7.8.2 martin save %sp, -CC64FSZ, %sp 45 1.7.8.2 martin 46 1.7.8.2 martin /* 47 1.7.8.2 martin * Sanity checks: func and stack may not be NULL. 48 1.7.8.2 martin */ 49 1.7.8.2 martin brz,pn %i0,8f ! func == NULL, bail 50 1.7.8.2 martin orcc %i1, %g0, %o1 ! setup stack arg for syscall, test 51 1.7.8.2 martin bz,pn %xcc, 8f ! stack == NULL, bail 52 1.7.8.2 martin mov %i2, %o0 ! setup flags arg for syscall 53 1.7.8.2 martin 54 1.7.8.2 martin /* 55 1.7.8.2 martin * Allocate "caller's" frame in the child stack as ABI 56 1.7.8.2 martin * requires. Subtract BIAS - it will be 64-bit code. 57 1.7.8.2 martin * 58 1.7.8.2 martin * We pass the function and the argument to the child by 59 1.7.8.2 martin * stashing them at the bottom of the frame. There they are 60 1.7.8.2 martin * safe from window spill would we need to take one as it's 61 1.7.8.2 martin * below the window save area. 62 1.7.8.2 martin */ 63 1.7.8.2 martin sub %o1, CC64FSZ+BIAS, %o1 ! make space 64 1.7.8.2 martin stx %i0, [%o1+CC64FSZ-16+BIAS] ! save func 65 1.7.8.2 martin stx %i3, [%o1+CC64FSZ-8+BIAS] ! save arg 66 1.7.8.2 martin 67 1.7.8.2 martin /* 68 1.7.8.2 martin * Args are now set up for system call as (flags, stack). 69 1.7.8.2 martin */ 70 1.7.8.2 martin mov SYS___clone, %g1 71 1.7.8.2 martin t ST_SYSCALL 72 1.7.8.2 martin bcs,pn %xcc, 9f 73 1.7.8.2 martin tst %o1 ! %o1 (rv[1]) == 0 in parent 74 1.7.8.2 martin bz %xcc, 2f ! yes, parent 75 1.7.8.2 martin ldx [%sp+CC64FSZ-16+BIAS], %l0 ! grab the function... 76 1.7.8.2 martin call %l0 ! Call the clone's entry point. 77 1.7.8.2 martin ldx [%sp+CC64FSZ-8+BIAS], %o0 ! ...and the argument 78 1.7.8.2 martin 79 1.7.8.2 martin JUMP(_exit) 80 1.7.8.2 martin /* NOTREACHED */ 81 1.7.8.2 martin 82 1.7.8.2 martin 2: ret 83 1.7.8.2 martin restore %g0, %o0, %o0 84 1.7.8.2 martin 85 1.7.8.2 martin 8: restore %g0, EINVAL, %o0 86 1.7.8.2 martin ERROR() 87 1.7.8.2 martin /* NOTREACHED */ 88 1.7.8.2 martin 89 1.7.8.2 martin 9: restore %o0, %g0, %o0 90 1.7.8.2 martin ERROR() 91 1.7.8.2 martin /* NOTREACHED */ 92
Indexes created Thu Oct 02 14:10:14 GMT 2025