minix/lib/libc/arch/x86_64/gen/_lwp.c

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/* $NetBSD: _lwp.c,v 1.7 2011/02/24 04:28:43 joerg Exp $ */
/*-
* Copyright (c) 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Nathan J. Williams.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: _lwp.c,v 1.7 2011/02/24 04:28:43 joerg Exp $");
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include <sys/types.h>
#include <inttypes.h>
#include <ucontext.h>
#include <lwp.h>
#include <stdlib.h>
void
_lwp_makecontext(ucontext_t *u, void (*start)(void *),
void *arg, void *private, caddr_t stack_base, size_t stack_size)
{
__greg_t *gr = u->uc_mcontext.__gregs;
void **sp;
getcontext(u);
u->uc_link = NULL;
u->uc_stack.ss_sp = stack_base;
u->uc_stack.ss_size = stack_size;
/* LINTED uintptr_t is safe */
gr[_REG_RIP] = (uintptr_t)start;
sp = (void **) (((uintptr_t)(stack_base + stack_size) & ~15));
/* LINTED __greg_t is safe */
gr[_REG_RDI] = (__greg_t)arg;
*--sp = (void *) _lwp_exit;
/* LINTED uintptr_t is safe */
gr[_REG_URSP] = (uintptr_t) sp;
u->uc_mcontext._mc_tlsbase = (uintptr_t)private;
u->uc_flags |= _UC_TLSBASE;
}