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      1 /*	$NetBSD: crtfm.c,v 1.1 2013/08/05 13:38:35 matt Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2002 Wasabi Systems, Inc.
      5  * All rights reserved.
      6  *
      7  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *	This product includes software developed for the NetBSD Project by
     20  *	Wasabi Systems, Inc.
     21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
     22  *    or promote products derived from this software without specific prior
     23  *    written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
     29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     35  * POSSIBILITY OF SUCH DAMAGE.
     36  */
     37 
     38 /*
     39  * Support for the GCC "-ffast-math" option on the Alpha.
     40  */
     41 
     42 #include <sys/types.h>
     43 
     44 #include <machine/fpu.h>
     45 #include <machine/sysarch.h>
     46 
     47 /*
     48  * Must provide this wrapper around sysarch(2) so that statically-linked
     49  * programs work properly.
     50  */
     51 
     52 extern void __alpha_sysarch(int, void *);
     53 
     54 __asm(".ent __alpha_sysarch 0	;\n"
     55 "__alpha_sysarch:		;\n"
     56 "	ldiq	$0, 165		;\n" /* v0 = SYS_sysarch */
     57 "	call_pal 0x0083		;\n" /* PAL_OSF1_callsys */
     58 "	ret	$31,($26),1	;\n"
     59 ".end __alpha_sysarch");
     60 
     61 static void __attribute__((__constructor__))
     62 __alpha_set_fast_math(void)
     63 {
     64 	struct alpha_fp_c_args args;
     65 
     66 	args.fp_c = IEEE_MAP_DMZ|IEEE_MAP_UMZ;
     67 	__alpha_sysarch(ALPHA_SET_FP_C, &args);
     68 }
     69