1/* $NetBSD: _lwp.c,v 1.4 2005/06/12 05:21:25 lukem Exp $ */ 2 3/* 4 * Copyright (c) 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38#include <sys/cdefs.h> 39#if defined(LIBC_SCCS) && !defined(lint) 40__RCSID("$NetBSD: _lwp.c,v 1.4 2005/06/12 05:21:25 lukem Exp $"); 41#endif /* LIBC_SCCS and not lint */ 42 43#include "namespace.h" 44#include <sys/types.h> 45#include <ucontext.h> 46#include <lwp.h> 47#include <stdlib.h> 48 49void 50_lwp_makecontext(ucontext_t *u, void (*start)(void *), 51 void *arg, void *private, caddr_t stack_base, size_t stack_size) 52{ 53 void **sp; 54 55 getcontext(u); 56 u->uc_link = NULL; 57 58 u->uc_stack.ss_sp = stack_base; 59 u->uc_stack.ss_size = stack_size; 60 61 sp = (void **) (stack_base + stack_size); 62 63 /* 64 * Note: We make sure the stack is 8-byte aligned, here. 65 */ 66 67 u->uc_mcontext.__gregs[_REG_R0] = (__greg_t) arg; 68 u->uc_mcontext.__gregs[_REG_SP] = ((__greg_t) sp) & ~7; 69 u->uc_mcontext.__gregs[_REG_LR] = (__greg_t) _lwp_exit; 70 u->uc_mcontext.__gregs[_REG_PC] = (__greg_t) start; 71 u->uc_mcontext._mc_tlsbase = (uintptr_t)private; 72 u->uc_flags |= _UC_TLSBASE; 73} 74