4 * Code to implement the FPU register/register arithmetic instructions
7 * Copyright (C) 1992,1993,1994
8 * W. Metzenthen, 22 Parker St, Ormond, Vic 3163,
9 * Australia. E-mail billm@vaxc.cc.monash.edu.au
10 * All rights reserved.
12 * This copyright notice covers the redistribution and use of the
13 * FPU emulator developed by W. Metzenthen. It covers only its use
14 * in the 386BSD, FreeBSD and NetBSD operating systems. Any other
15 * use is not permitted under this copyright.
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions
20 * 1. Redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer.
22 * 2. Redistributions in binary form must include information specifying
23 * that source code for the emulator is freely available and include
25 * a) an offer to provide the source code for a nominal distribution
27 * b) list at least two alternative methods whereby the source
28 * can be obtained, e.g. a publically accessible bulletin board
29 * and an anonymous ftp site from which the software can be
31 * 3. All advertising materials specifically mentioning features or use of
32 * this emulator must acknowledge that it was developed by W. Metzenthen.
33 * 4. The name of W. Metzenthen may not be used to endorse or promote
34 * products derived from this software without specific prior written
37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
38 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
39 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
40 * W. METZENTHEN BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
41 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
42 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
43 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
44 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
45 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
46 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
49 * The purpose of this copyright, based upon the Berkeley copyright, is to
50 * ensure that the covered software remains freely available to everyone.
52 * The software (with necessary differences) is also available, but under
53 * the terms of the GNU copyleft, for the Linux operating system and for
54 * the djgpp ms-dos extender.
56 * W. Metzenthen June 1994.
59 * $FreeBSD: src/sys/gnu/i386/fpemul/fpu_arith.c,v 1.9 1999/08/28 00:42:49 peter Exp $
60 * $DragonFly: src/sys/i386/gnu/fpemul/Attic/fpu_arith.c,v 1.3 2003/08/07 21:17:20 dillon Exp $
67 #include <sys/param.h>
69 #include <machine/pcb.h>
72 #include "fpu_system.h"
79 reg_add(FPU_st0_ptr, &st(FPU_rm), FPU_st0_ptr, control_word);
87 reg_mul(FPU_st0_ptr, &st(FPU_rm), FPU_st0_ptr, control_word);
96 reg_sub(FPU_st0_ptr, &st(FPU_rm), FPU_st0_ptr, control_word);
104 reg_sub(&st(FPU_rm), FPU_st0_ptr, FPU_st0_ptr, control_word);
112 reg_div(FPU_st0_ptr, &st(FPU_rm), FPU_st0_ptr, control_word);
120 reg_div(&st(FPU_rm), FPU_st0_ptr, FPU_st0_ptr, control_word);
129 reg_add(FPU_st0_ptr, &st(FPU_rm), &st(FPU_rm), control_word);
137 reg_mul(&st(FPU_rm), FPU_st0_ptr, &st(FPU_rm), control_word);
145 /* This is the sense of the 80486 manual reg_sub(&st(FPU_rm),
146 * FPU_st0_ptr, &st(FPU_rm), control_word); */
147 reg_sub(FPU_st0_ptr, &st(FPU_rm), &st(FPU_rm), control_word);
155 /* This is the sense of the 80486 manual reg_sub(FPU_st0_ptr,
156 * &st(FPU_rm), &st(FPU_rm), control_word); */
157 reg_sub(&st(FPU_rm), FPU_st0_ptr, &st(FPU_rm), control_word);
165 reg_div(FPU_st0_ptr, &st(FPU_rm), &st(FPU_rm), control_word);
173 reg_div(&st(FPU_rm), FPU_st0_ptr, &st(FPU_rm), control_word);
182 reg_add(FPU_st0_ptr, &st(FPU_rm), &st(FPU_rm), control_word);
191 reg_mul(&st(FPU_rm), FPU_st0_ptr, &st(FPU_rm), control_word);
200 /* fsubrp st(i),st */
201 /* This is the sense of the 80486 manual reg_sub(&st(FPU_rm),
202 * FPU_st0_ptr, &st(FPU_rm), control_word); */
203 reg_sub(FPU_st0_ptr, &st(FPU_rm), &st(FPU_rm), control_word);
212 /* This is the sense of the 80486 manual reg_sub(FPU_st0_ptr,
213 * &st(FPU_rm), &st(FPU_rm), control_word); */
214 reg_sub(&st(FPU_rm), FPU_st0_ptr, &st(FPU_rm), control_word);
222 /* fdivrp st(i),st */
223 reg_div(FPU_st0_ptr, &st(FPU_rm), &st(FPU_rm), control_word);
232 reg_div(&st(FPU_rm), FPU_st0_ptr, &st(FPU_rm), control_word);