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

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/* $NetBSD: _lwp.c,v 1.8 2011/04/29 08:05:22 matt Exp $ */
/*
* Copyright (c) 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Wayne Knowles
*
* 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 1.8 2011/04/29 08:05:22 matt Exp $");
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include <sys/types.h>
#include <ucontext.h>
#include <lwp.h>
#include <stdlib.h>
#if defined(__mips_o32) || defined(__mips_o64)
#define CALLFRAME_SIZ (6 * sizeof(void *))
#else
#define CALLFRAME_SIZ (4 * sizeof(uint64_t))
#endif
void
_lwp_makecontext(ucontext_t *u, void (*start)(void *),
void *arg, void *tcb, caddr_t stack_base, size_t stack_size)
{
caddr_t sp;
__greg_t *gr;
getcontext(u);
gr = u->uc_mcontext.__gregs;
u->uc_link = NULL;
u->uc_stack.ss_sp = stack_base;
u->uc_stack.ss_size = stack_size;
sp = stack_base + stack_size - CALLFRAME_SIZ;
gr[_REG_EPC] = (uintptr_t) start;
gr[_REG_T9] = (uintptr_t) start; /* required for .abicalls */
gr[_REG_RA] = (uintptr_t) _lwp_exit;
gr[_REG_A0] = (uintptr_t) arg;
gr[_REG_SP] = (uintptr_t) sp;
u->uc_mcontext._mc_tlsbase =
(uintptr_t)tcb + TLS_TP_OFFSET + sizeof(struct tls_tcb);
u->uc_flags |= _UC_TLSBASE;
}