NetBSD-5.0.2/lib/csu/alpha/crtfm.c

/*	$NetBSD: crtfm.c,v 1.2 2002/01/14 01:31:00 thorpej Exp $	*/

/*
 * Copyright (c) 2002 Wasabi Systems, Inc.
 * All rights reserved.
 *
 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
 *
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed for the NetBSD Project by
 *	Wasabi Systems, Inc.
 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
 *    or promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
 * 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.
 */

/*
 * Support for the GCC "-ffast-math" option on the Alpha.
 */

#include <sys/types.h>

#include <machine/fpu.h>
#include <machine/sysarch.h>

/*
 * Must provide this wrapper around sysarch(2) so that statically-linked
 * programs work properly.
 */

extern void __alpha_sysarch(int, void *);

__asm(".ent __alpha_sysarch 0	;\n"
"__alpha_sysarch:		;\n"
"	ldiq	$0, 165		;\n" /* v0 = SYS_sysarch */
"	call_pal 0x0083		;\n" /* PAL_OSF1_callsys */
"	ret	$31,($26),1	;\n"
".end __alpha_sysarch");

static void __attribute__((__constructor__))
__alpha_set_fast_math(void)
{
	struct alpha_fp_c_args args;

	args.fp_c = IEEE_MAP_DMZ|IEEE_MAP_UMZ;
	__alpha_sysarch(ALPHA_SET_FP_C, &args);
}