1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
|
/* $OpenBSD: reg_constant.c,v 1.2 2003/07/30 21:30:31 jason Exp $ */
/*
* reg_constant.c
*
* All of the constant FPU_REGs
*
*
* Copyright (C) 1992,1993,1994
* W. Metzenthen, 22 Parker St, Ormond, Vic 3163,
* Australia. E-mail billm@vaxc.cc.monash.edu.au
* All rights reserved.
*
* This copyright notice covers the redistribution and use of the
* FPU emulator developed by W. Metzenthen. It covers only its use
* in the 386BSD, FreeBSD and NetBSD operating systems. Any other
* use is not permitted under this copyright.
*
* 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 include information specifying
* that source code for the emulator is freely available and include
* either:
* a) an offer to provide the source code for a nominal distribution
* fee, or
* b) list at least two alternative methods whereby the source
* can be obtained, e.g. a publically accessible bulletin board
* and an anonymous ftp site from which the software can be
* downloaded.
* 3. All advertising materials specifically mentioning features or use of
* this emulator must acknowledge that it was developed by W. Metzenthen.
* 4. The name of W. Metzenthen may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED ``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
* W. METZENTHEN 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.
*
*
* The purpose of this copyright, based upon the Berkeley copyright, is to
* ensure that the covered software remains freely available to everyone.
*
* The software (with necessary differences) is also available, but under
* the terms of the GNU copyleft, for the Linux operating system and for
* the djgpp ms-dos extender.
*
* W. Metzenthen June 1994.
*
*
* $id:$
*
*/
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/user.h>
#include <machine/cpu.h>
#include <machine/pcb.h>
#include <gnu/arch/i386/fpemul/fpu_emu.h>
#include <gnu/arch/i386/fpemul/fpu_system.h>
#include <gnu/arch/i386/fpemul/status_w.h>
#include <gnu/arch/i386/fpemul/reg_constant.h>
FPU_REG CONST_1 = {SIGN_POS, TW_Valid, EXP_BIAS,
0x00000000, 0x80000000};
static FPU_REG CONST_L2T = {SIGN_POS, TW_Valid, EXP_BIAS + 1,
0xcd1b8afe, 0xd49a784b};
static FPU_REG CONST_L2E = {SIGN_POS, TW_Valid, EXP_BIAS,
0x5c17f0bc, 0xb8aa3b29};
FPU_REG CONST_PI = {SIGN_POS, TW_Valid, EXP_BIAS + 1,
0x2168c235, 0xc90fdaa2};
FPU_REG CONST_PI2 = {SIGN_POS, TW_Valid, EXP_BIAS,
0x2168c235, 0xc90fdaa2};
FPU_REG CONST_PI4 = {SIGN_POS, TW_Valid, EXP_BIAS - 1,
0x2168c235, 0xc90fdaa2};
static FPU_REG CONST_LG2 = {SIGN_POS, TW_Valid, EXP_BIAS - 2,
0xfbcff799, 0x9a209a84};
FPU_REG CONST_LN2 = {SIGN_POS, TW_Valid, EXP_BIAS - 1,
0xd1cf79ac, 0xb17217f7};
/* Only the sign (and tag) is used in internal zeroes */
FPU_REG CONST_Z = {SIGN_POS, TW_Zero, 0, 0x0, 0x0};
/* Only the sign and significand (and tag) are used in internal NaNs */
/* The 80486 never generates one of these
FPU_REG CONST_SNAN = { SIGN_POS, TW_NaN, EXP_OVER, 0x00000001, 0x80000000 };
*/
/* This is the real indefinite QNaN */
FPU_REG CONST_QNaN = {SIGN_NEG, TW_NaN, EXP_OVER, 0x00000000, 0xC0000000};
/* Only the sign (and tag) is used in internal infinities */
FPU_REG CONST_INF = {SIGN_POS, TW_Infinity, EXP_OVER, 0x00000000, 0x80000000};
static void
fld_const(FPU_REG * c)
{
FPU_REG *st_new_ptr;
if (STACK_OVERFLOW) {
stack_overflow();
return;
}
push();
reg_move(c, FPU_st0_ptr);
status_word &= ~SW_C1;
}
static void
fld1(void)
{
fld_const(&CONST_1);
}
static void
fldl2t(void)
{
fld_const(&CONST_L2T);
}
static void
fldl2e(void)
{
fld_const(&CONST_L2E);
}
static void
fldpi(void)
{
fld_const(&CONST_PI);
}
static void
fldlg2(void)
{
fld_const(&CONST_LG2);
}
static void
fldln2(void)
{
fld_const(&CONST_LN2);
}
static void
fldz(void)
{
fld_const(&CONST_Z);
}
static FUNC constants_table[] = {
fld1, fldl2t, fldl2e, fldpi, fldlg2, fldln2, fldz, Un_impl
};
void
fconst(void)
{
(constants_table[FPU_rm]) ();
}
|
