4 * Implement a few FPU 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_etc.c,v 1.8 1999/08/28 00:42:51 peter Exp $
60 * $DragonFly: src/sys/platform/pc32/gnu/fpemul/Attic/fpu_etc.c,v 1.3 2003/08/07 21:17:20 dillon Exp $
64 #include <sys/param.h>
66 #include <sys/systm.h> /* for printf() in EXCEPTION() */
69 #include <machine/pcb.h>
72 #include "fpu_system.h"
73 #include "exception.h"
81 FPU_st0_ptr->sign ^= SIGN_POS ^ SIGN_NEG;
82 status_word &= ~SW_C1;
90 if (FPU_st0_tag ^ TW_Empty) {
91 FPU_st0_ptr->sign = SIGN_POS;
92 status_word &= ~SW_C1;
101 switch (FPU_st0_tag) {
107 #ifdef DENORM_OPERAND
108 if ((FPU_st0_ptr->exp <= EXP_UNDER) && (denormal_operand()))
110 #endif /* DENORM_OPERAND */
112 if (FPU_st0_ptr->sign == SIGN_POS)
118 setcc(SW_C0 | SW_C2 | SW_C3); /* Operand is not comparable */
119 EXCEPTION(EX_Invalid);
122 if (FPU_st0_ptr->sign == SIGN_POS)
126 EXCEPTION(EX_Invalid);
129 setcc(SW_C0 | SW_C2 | SW_C3);
130 EXCEPTION(EX_StackUnder);
133 setcc(SW_C0 | SW_C2 | SW_C3); /* Operand is not comparable */
134 EXCEPTION(EX_INTERNAL | 0x14);
143 switch (FPU_st0_tag) {
151 /* This will need to be changed if TW_Denormal is ever used. */
152 if (FPU_st0_ptr->exp <= EXP_UNDER)
153 c = SW_C2 | SW_C3; /* Denormal */
164 if (FPU_st0_ptr->sign == SIGN_NEG)
169 static FUNC fp_etc_table[] = {
170 fchs, fabs, Un_impl, Un_impl, ftst_, fxam, Un_impl, Un_impl
176 (fp_etc_table[FPU_rm]) ();