1/* $NetBSD: __clone.S,v 1.6 2008/04/28 20:22:56 martin 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 * 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 36 WEAK_ALIAS(clone, __clone) 37#endif 38 39 .import __cerror, code 40 41/* 42 * int clone(int (*fn)(void *), void *stack, int flags, void *arg); 43 */ 44ENTRY(__clone, 0) 45 46 /* 47 * Sanity checks: func and stack may not be NULL. 48 */ 49 ldi EINVAL, %t1 50 comb,= %r0, %arg0, __cerror 51 nop 52 comb,= %r0, %arg1, __cerror 53 nop 54 55 /* 56 * Put the func and arg arguments into a frame in the child's stack. 57 */ 58 ldo (HPPA_FRAME_SIZE * 2)(%arg1), %arg1 59 stw %arg0, HPPA_FRAME_ARG(0)(%arg1) 60 stw %arg3, HPPA_FRAME_ARG(1)(%arg1) 61 62 /* 63 * The system call expects (flags, stack). 64 */ 65 copy %arg2, %arg0 66 SYSCALL(__clone) 67 comb,<>,n %r0, %ret1, 9f 68 bv,n %r0(%rp) 69 709: /* 71 * Child: Reload the function and argument from the new stack. 72 */ 73 ldw HPPA_FRAME_ARG(0)(%sp), %r22 74 ldw HPPA_FRAME_ARG(1)(%sp), %arg0 75 76 /* Call the clone's entry point. */ 77 stw %r19, HPPA_FRAME_ARG(2)(%sp) 78 bl $$dyncall, %r31 79 copy %r31, %rp 80 ldw HPPA_FRAME_ARG(2)(%sp), %r19 81 82 /* Pass the return value to _exit(). */ 83 copy %ret0, %arg0 84 PIC_CALL(_exit) 85 86 /* NOTREACHED */ 87EXIT(__clone) 88