1/* $NetBSD: __clone.S,v 1.8 2020/05/05 20:43:47 skrll 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/* 40 * int clone(int (*fn)(void *), void *stack, int flags, void *arg); 41 */ 42ENTRY(__clone, 0) 43 44 /* 45 * Sanity checks: func and stack may not be NULL. 46 */ 47 comb,= %r0, %arg0, 8f 48 nop 49 comb,= %r0, %arg1, 8f 50 nop 51 52 /* 53 * Put the func and arg arguments into a frame in the child's stack. 54 */ 55 ldo (HPPA_FRAME_SIZE * 2)(%arg1), %arg1 56 stw %arg0, HPPA_FRAME_ARG(0)(%arg1) 57 stw %arg3, HPPA_FRAME_ARG(1)(%arg1) 58 59 /* 60 * The system call expects (flags, stack). 61 */ 62 copy %arg2, %arg0 63 SYSCALL(__clone) 64 comb,<>,n %r0, %ret1, 9f 65 bv,n %r0(%rp) 66 678: 68 b __cerror 69 ldi EINVAL, %t1 70 719: /* 72 * Child: Reload the function and argument from the new stack. 73 */ 74 ldw HPPA_FRAME_ARG(0)(%sp), %r22 75 ldw HPPA_FRAME_ARG(1)(%sp), %arg0 76 77 /* Call the clone's entry point. */ 78 stw %r19, HPPA_FRAME_ARG(2)(%sp) 79 bl $$dyncall, %r31 80 copy %r31, %rp 81 ldw HPPA_FRAME_ARG(2)(%sp), %r19 82 83 /* Pass the return value to _exit(). */ 84 copy %ret0, %arg0 85 PIC_CALL(_exit) 86 87 /* NOTREACHED */ 88EXIT(__clone) 89