__clone.S revision 1.3.2.2
1 1.3.2.2 nathanw /* $NetBSD: __clone.S,v 1.3.2.2 2001/10/08 20:17:49 nathanw Exp $ */ 2 1.3.2.2 nathanw 3 1.3.2.2 nathanw /*- 4 1.3.2.2 nathanw * Copyright (c) 2001 The NetBSD Foundation, Inc. 5 1.3.2.2 nathanw * All rights reserved. 6 1.3.2.2 nathanw * 7 1.3.2.2 nathanw * This code is derived from software contributed to The NetBSD Foundation 8 1.3.2.2 nathanw * by Jason R. Thorpe. 9 1.3.2.2 nathanw * 10 1.3.2.2 nathanw * Redistribution and use in source and binary forms, with or without 11 1.3.2.2 nathanw * modification, are permitted provided that the following conditions 12 1.3.2.2 nathanw * are met: 13 1.3.2.2 nathanw * 1. Redistributions of source code must retain the above copyright 14 1.3.2.2 nathanw * notice, this list of conditions and the following disclaimer. 15 1.3.2.2 nathanw * 2. Redistributions in binary form must reproduce the above copyright 16 1.3.2.2 nathanw * notice, this list of conditions and the following disclaimer in the 17 1.3.2.2 nathanw * documentation and/or other materials provided with the distribution. 18 1.3.2.2 nathanw * 3. All advertising materials mentioning features or use of this software 19 1.3.2.2 nathanw * must display the following acknowledgement: 20 1.3.2.2 nathanw * This product includes software developed by the NetBSD 21 1.3.2.2 nathanw * Foundation, Inc. and its contributors. 22 1.3.2.2 nathanw * 4. Neither the name of The NetBSD Foundation nor the names of its 23 1.3.2.2 nathanw * contributors may be used to endorse or promote products derived 24 1.3.2.2 nathanw * from this software without specific prior written permission. 25 1.3.2.2 nathanw * 26 1.3.2.2 nathanw * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 1.3.2.2 nathanw * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 1.3.2.2 nathanw * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 1.3.2.2 nathanw * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 1.3.2.2 nathanw * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 1.3.2.2 nathanw * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 1.3.2.2 nathanw * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 1.3.2.2 nathanw * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 1.3.2.2 nathanw * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 1.3.2.2 nathanw * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 1.3.2.2 nathanw * POSSIBILITY OF SUCH DAMAGE. 37 1.3.2.2 nathanw */ 38 1.3.2.2 nathanw 39 1.3.2.2 nathanw #include <sys/errno.h> 40 1.3.2.2 nathanw 41 1.3.2.2 nathanw #include "SYS.h" 42 1.3.2.2 nathanw 43 1.3.2.2 nathanw #ifdef WEAK_ALIAS 44 1.3.2.2 nathanw WEAK_ALIAS(clone, __clone) 45 1.3.2.2 nathanw #endif 46 1.3.2.2 nathanw 47 1.3.2.2 nathanw /* 48 1.3.2.2 nathanw * int __clone(int (*fn)(void *), void *stack, int flags, void *arg); 49 1.3.2.2 nathanw */ 50 1.3.2.2 nathanw LEAF(__clone) 51 1.3.2.2 nathanw PIC_PROLOGUE(__clone, t9) 52 1.3.2.2 nathanw 53 1.3.2.2 nathanw /* 54 1.3.2.2 nathanw * Sanity checks: func and stack may not be NULL. 55 1.3.2.2 nathanw */ 56 1.3.2.2 nathanw li v0, EINVAL 57 1.3.2.2 nathanw beq a0, zero, 9f 58 1.3.2.2 nathanw beq a1, zero, 9f 59 1.3.2.2 nathanw 60 1.3.2.2 nathanw /* 61 1.3.2.2 nathanw * We need to be able to get at the func and arg arguments 62 1.3.2.2 nathanw * in the child. Luckily, we have a convenient place to 63 1.3.2.2 nathanw * do this; the child's stack. 64 1.3.2.2 nathanw */ 65 1.3.2.2 nathanw subu a1, a1, (2 * SZREG) 66 1.3.2.2 nathanw REG_S a0, 0(a1) 67 1.3.2.2 nathanw REG_S a3, SZREG(a1) 68 1.3.2.2 nathanw 69 1.3.2.2 nathanw /* 70 1.3.2.2 nathanw * The system call expects (flags, stack). 71 1.3.2.2 nathanw */ 72 1.3.2.2 nathanw move a0, a2 73 1.3.2.2 nathanw SYSTRAP(__clone) 74 1.3.2.2 nathanw bne a3, zero, 8f 75 1.3.2.2 nathanw 76 1.3.2.2 nathanw bne v1, zero, 9f # v1 (rv[1]) == 0, parent, child pid in v0 77 1.3.2.2 nathanw 78 1.3.2.2 nathanw j ra # parent return 79 1.3.2.2 nathanw 80 1.3.2.2 nathanw 8: PIC_CALL(__cerror, t9) 81 1.3.2.2 nathanw /* NOTREACHED */ 82 1.3.2.2 nathanw 83 1.3.2.2 nathanw 9: /* 84 1.3.2.2 nathanw * Child: Fetch the function and argument from the new stack, 85 1.3.2.2 nathanw * and pop it back. 86 1.3.2.2 nathanw */ 87 1.3.2.2 nathanw REG_L t9, 0(sp) 88 1.3.2.2 nathanw REG_L a0, SZREG(sp) 89 1.3.2.2 nathanw addu sp, sp, (2 * SZREG) 90 1.3.2.2 nathanw 91 1.3.2.2 nathanw #ifdef ABICALLS 92 1.3.2.2 nathanw .cprestore 93 1.3.2.2 nathanw #endif 94 1.3.2.2 nathanw 95 1.3.2.2 nathanw /* Call the clone's entry point. */ 96 1.3.2.2 nathanw jal t9 97 1.3.2.2 nathanw 98 1.3.2.2 nathanw /* Pass the return value to _exit(). */ 99 1.3.2.2 nathanw move a0, v0 100 1.3.2.2 nathanw PIC_CALL(_exit, t9) 101 1.3.2.2 nathanw 102 1.3.2.2 nathanw /* NOTREACHED */ 103 1.3.2.2 nathanw END(__clone) 104
Indexes created Thu Oct 02 01:09:59 GMT 2025