1*e415d488SLionel Sambuc /* $NetBSD: _lwp.c,v 1.8 2012/03/18 16:26:34 christos Exp $ */
22fe8fb19SBen Gras
32fe8fb19SBen Gras /*-
42fe8fb19SBen Gras * Copyright (c) 2001 The NetBSD Foundation, Inc.
52fe8fb19SBen Gras * All rights reserved.
62fe8fb19SBen Gras *
72fe8fb19SBen Gras * This code is derived from software contributed to The NetBSD Foundation
82fe8fb19SBen Gras * by Nathan J. Williams and Steve C. Woodford.
92fe8fb19SBen Gras *
102fe8fb19SBen Gras * Redistribution and use in source and binary forms, with or without
112fe8fb19SBen Gras * modification, are permitted provided that the following conditions
122fe8fb19SBen Gras * are met:
132fe8fb19SBen Gras * 1. Redistributions of source code must retain the above copyright
142fe8fb19SBen Gras * notice, this list of conditions and the following disclaimer.
152fe8fb19SBen Gras * 2. Redistributions in binary form must reproduce the above copyright
162fe8fb19SBen Gras * notice, this list of conditions and the following disclaimer in the
172fe8fb19SBen Gras * documentation and/or other materials provided with the distribution.
182fe8fb19SBen Gras *
192fe8fb19SBen Gras * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
202fe8fb19SBen Gras * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
212fe8fb19SBen Gras * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
222fe8fb19SBen Gras * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
232fe8fb19SBen Gras * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
242fe8fb19SBen Gras * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
252fe8fb19SBen Gras * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
262fe8fb19SBen Gras * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
272fe8fb19SBen Gras * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
282fe8fb19SBen Gras * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
292fe8fb19SBen Gras * POSSIBILITY OF SUCH DAMAGE.
302fe8fb19SBen Gras */
312fe8fb19SBen Gras
322fe8fb19SBen Gras #include <sys/cdefs.h>
332fe8fb19SBen Gras #if defined(LIBC_SCCS) && !defined(lint)
34*e415d488SLionel Sambuc __RCSID("$NetBSD: _lwp.c,v 1.8 2012/03/18 16:26:34 christos Exp $");
352fe8fb19SBen Gras #endif /* LIBC_SCCS and not lint */
362fe8fb19SBen Gras
372fe8fb19SBen Gras #include "namespace.h"
382fe8fb19SBen Gras #include <sys/types.h>
39*e415d488SLionel Sambuc #include <sys/tls.h>
402fe8fb19SBen Gras #include <ucontext.h>
412fe8fb19SBen Gras #include <lwp.h>
422fe8fb19SBen Gras #include <stdlib.h>
432fe8fb19SBen Gras
442fe8fb19SBen Gras void
_lwp_makecontext(ucontext_t * u,void (* start)(void *),void * arg,void * tcb,caddr_t stack_base,size_t stack_size)452fe8fb19SBen Gras _lwp_makecontext(ucontext_t *u, void (*start)(void *),
46*e415d488SLionel Sambuc void *arg, void *tcb, caddr_t stack_base, size_t stack_size)
472fe8fb19SBen Gras {
482fe8fb19SBen Gras void **sp;
492fe8fb19SBen Gras
502fe8fb19SBen Gras getcontext(u);
512fe8fb19SBen Gras u->uc_link = NULL;
522fe8fb19SBen Gras
532fe8fb19SBen Gras u->uc_stack.ss_sp = stack_base;
542fe8fb19SBen Gras u->uc_stack.ss_size = stack_size;
552fe8fb19SBen Gras
562fe8fb19SBen Gras u->uc_mcontext.__gregs[_REG_PC] = (int)start;
572fe8fb19SBen Gras
58*e415d488SLionel Sambuc sp = (void **)(void *)(stack_base + stack_size);
592fe8fb19SBen Gras
602fe8fb19SBen Gras *--sp = arg;
612fe8fb19SBen Gras *--sp = (void *) _lwp_exit;
622fe8fb19SBen Gras
632fe8fb19SBen Gras u->uc_mcontext.__gregs[_REG_A7] = (int) sp;
64*e415d488SLionel Sambuc u->uc_mcontext._mc_tlsbase = (uintptr_t)tcb + TLS_TP_OFFSET +
65*e415d488SLionel Sambuc sizeof(struct tls_tcb);
66*e415d488SLionel Sambuc u->uc_flags |= _UC_TLSBASE;
672fe8fb19SBen Gras }
68