1*0a6a1f1dSLionel Sambuc /* $NetBSD: _lwp.c,v 1.1 2014/08/10 05:47:36 matt Exp $ */
2*0a6a1f1dSLionel Sambuc
3*0a6a1f1dSLionel Sambuc /*-
4*0a6a1f1dSLionel Sambuc * Copyright (c) 2014 The NetBSD Foundation, Inc.
5*0a6a1f1dSLionel Sambuc * All rights reserved.
6*0a6a1f1dSLionel Sambuc *
7*0a6a1f1dSLionel Sambuc * This code is derived from software contributed to The NetBSD Foundation
8*0a6a1f1dSLionel Sambuc * by Matt Thomas of 3am Software Foundry.
9*0a6a1f1dSLionel Sambuc *
10*0a6a1f1dSLionel Sambuc * Redistribution and use in source and binary forms, with or without
11*0a6a1f1dSLionel Sambuc * modification, are permitted provided that the following conditions
12*0a6a1f1dSLionel Sambuc * are met:
13*0a6a1f1dSLionel Sambuc * 1. Redistributions of source code must retain the above copyright
14*0a6a1f1dSLionel Sambuc * notice, this list of conditions and the following disclaimer.
15*0a6a1f1dSLionel Sambuc * 2. Redistributions in binary form must reproduce the above copyright
16*0a6a1f1dSLionel Sambuc * notice, this list of conditions and the following disclaimer in the
17*0a6a1f1dSLionel Sambuc * documentation and/or other materials provided with the distribution.
18*0a6a1f1dSLionel Sambuc *
19*0a6a1f1dSLionel Sambuc * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20*0a6a1f1dSLionel Sambuc * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21*0a6a1f1dSLionel Sambuc * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22*0a6a1f1dSLionel Sambuc * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23*0a6a1f1dSLionel Sambuc * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24*0a6a1f1dSLionel Sambuc * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25*0a6a1f1dSLionel Sambuc * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26*0a6a1f1dSLionel Sambuc * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27*0a6a1f1dSLionel Sambuc * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28*0a6a1f1dSLionel Sambuc * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29*0a6a1f1dSLionel Sambuc * POSSIBILITY OF SUCH DAMAGE.
30*0a6a1f1dSLionel Sambuc */
31*0a6a1f1dSLionel Sambuc
32*0a6a1f1dSLionel Sambuc #include <sys/cdefs.h>
33*0a6a1f1dSLionel Sambuc #if defined(LIBC_SCCS) && !defined(lint)
34*0a6a1f1dSLionel Sambuc __RCSID("$NetBSD: _lwp.c,v 1.1 2014/08/10 05:47:36 matt Exp $");
35*0a6a1f1dSLionel Sambuc #endif /* LIBC_SCCS and not lint */
36*0a6a1f1dSLionel Sambuc
37*0a6a1f1dSLionel Sambuc #include "namespace.h"
38*0a6a1f1dSLionel Sambuc #include <sys/types.h>
39*0a6a1f1dSLionel Sambuc #include <ucontext.h>
40*0a6a1f1dSLionel Sambuc #include <lwp.h>
41*0a6a1f1dSLionel Sambuc #include <stdlib.h>
42*0a6a1f1dSLionel Sambuc
43*0a6a1f1dSLionel Sambuc void
_lwp_makecontext(ucontext_t * u,void (* start)(void *),void * arg,void * private,caddr_t stack_base,size_t stack_size)44*0a6a1f1dSLionel Sambuc _lwp_makecontext(ucontext_t *u, void (*start)(void *),
45*0a6a1f1dSLionel Sambuc void *arg, void *private, caddr_t stack_base, size_t stack_size)
46*0a6a1f1dSLionel Sambuc {
47*0a6a1f1dSLionel Sambuc getcontext(u);
48*0a6a1f1dSLionel Sambuc u->uc_link = NULL;
49*0a6a1f1dSLionel Sambuc
50*0a6a1f1dSLionel Sambuc u->uc_stack.ss_sp = stack_base;
51*0a6a1f1dSLionel Sambuc u->uc_stack.ss_size = stack_size;
52*0a6a1f1dSLionel Sambuc
53*0a6a1f1dSLionel Sambuc uintptr_t sp = (uintptr_t)stack_base + stack_size;
54*0a6a1f1dSLionel Sambuc
55*0a6a1f1dSLionel Sambuc /*
56*0a6a1f1dSLionel Sambuc * Note: We make sure the stack is 16-byte aligned, here.
57*0a6a1f1dSLionel Sambuc */
58*0a6a1f1dSLionel Sambuc
59*0a6a1f1dSLionel Sambuc u->uc_mcontext.__gregs[_REG_X0] = (__greg_t)(uintptr_t)arg;
60*0a6a1f1dSLionel Sambuc u->uc_mcontext.__gregs[_REG_SP] = ((__greg_t)sp) & -16;
61*0a6a1f1dSLionel Sambuc u->uc_mcontext.__gregs[_REG_X29] = (__greg_t)(uintptr_t)_lwp_exit;
62*0a6a1f1dSLionel Sambuc u->uc_mcontext.__gregs[_REG_PC] = (__greg_t)(uintptr_t)start;
63*0a6a1f1dSLionel Sambuc u->uc_mcontext.__gregs[_REG_TPIDR] = (__greg_t)(uintptr_t)private;
64*0a6a1f1dSLionel Sambuc }
65