xref: /src/lib/csu/arch/ia64/crt0.S

/* $NetBSD: crt0.S,v 1.3 2019/05/04 22:55:32 scole Exp $ */

/*-
 * Copyright (c) 2014 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Cherry G. Mathew of Backyard Innovations, UK, Ltd.
 *
 * 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 <machine/asm.h>

RCSID("$NetBSD: crt0.S,v 1.3 2019/05/04 22:55:32 scole Exp $")

STRONG_ALIAS(_start,__start)

.proc __start
.global __start

/*
 * Called with:
 * 	in0 = cleanup
 * 	in1 = obj
 * 	in2 = ps_strings
 * 	in3 = sp
 * See: sys/arch/ia64/ia64/machdep.c:setregs()
 */

__start:
	.regstk 4, 0, 0, 0

	mov sp = in3 /* Setup Memory Stack Pointer. */
	mov in1 = in2 /* obj is no longer used. */
	alloc r31 = ar.pfs, 3, 0, 0, 0 /* Adjust backingstore for ___start() */
	;;
	br.call.sptk.many rp = ___start