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[linux-2.6.git] / arch / m68k / math-emu / fp_emu.h
1 /*
2  * fp_emu.h
3  *
4  * Copyright Roman Zippel, 1997.  All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, and the entire permission notice in its entirety,
11  *    including the disclaimer of warranties.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  * 3. The name of the author may not be used to endorse or promote
16  *    products derived from this software without specific prior
17  *    written permission.
18  *
19  * ALTERNATIVELY, this product may be distributed under the terms of
20  * the GNU General Public License, in which case the provisions of the GPL are
21  * required INSTEAD OF the above restrictions.  (This clause is
22  * necessary due to a potential bad interaction between the GPL and
23  * the restrictions contained in a BSD-style copyright.)
24  *
25  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
29  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
30  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
31  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
33  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
35  * OF THE POSSIBILITY OF SUCH DAMAGE.
36  */
37
38 #ifndef _FP_EMU_H
39 #define _FP_EMU_H
40
41 #ifdef __ASSEMBLY__
42 #include <asm/offsets.h>
43 #endif
44 #include <asm/math-emu.h>
45
46 #ifndef __ASSEMBLY__
47
48 #define IS_INF(a) ((a)->exp == 0x7fff)
49 #define IS_ZERO(a) ((a)->mant.m64 == 0)
50
51
52 #define fp_set_sr(bit) ({                                       \
53         FPDATA->fpsr |= 1 << (bit);                             \
54 })
55
56 #define fp_set_quotient(quotient) ({                            \
57         FPDATA->fpsr &= 0xff00ffff;                             \
58         FPDATA->fpsr |= ((quotient) & 0xff) << 16;              \
59 })
60
61 /* linkage for several useful functions */
62
63 /* Normalize the extended struct, return 0 for a NaN */
64 #define fp_normalize_ext(fpreg) ({                              \
65         register struct fp_ext *reg asm ("a0") = fpreg;         \
66         register int res asm ("d0");                            \
67                                                                 \
68         asm volatile ("jsr fp_conv_ext2ext"                     \
69                         : "=d" (res) : "a" (reg)                \
70                         : "a1", "d1", "d2", "memory");          \
71         res;                                                    \
72 })
73
74 #define fp_copy_ext(dest, src) ({                               \
75         *dest = *src;                                           \
76 })
77
78 #define fp_monadic_check(dest, src) ({                          \
79         fp_copy_ext(dest, src);                                 \
80         if (!fp_normalize_ext(dest))                            \
81                 return dest;                                    \
82 })
83
84 #define fp_dyadic_check(dest, src) ({                           \
85         if (!fp_normalize_ext(dest))                            \
86                 return dest;                                    \
87         if (!fp_normalize_ext(src)) {                           \
88                 fp_copy_ext(dest, src);                         \
89                 return dest;                                    \
90         }                                                       \
91 })
92
93 extern const struct fp_ext fp_QNaN;
94 extern const struct fp_ext fp_Inf;
95
96 #define fp_set_nan(dest) ({                                     \
97         fp_set_sr(FPSR_EXC_OPERR);                              \
98         *dest = fp_QNaN;                                        \
99 })
100
101 /* TODO check rounding mode? */
102 #define fp_set_ovrflw(dest) ({                                  \
103         fp_set_sr(FPSR_EXC_OVFL);                               \
104         dest->exp = 0x7fff;                                     \
105         dest->mant.m64 = 0;                                     \
106 })
107
108 #define fp_conv_ext2long(src) ({                                \
109         register struct fp_ext *__src asm ("a0") = src;         \
110         register int __res asm ("d0");                          \
111                                                                 \
112         asm volatile ("jsr fp_conv_ext2long"                    \
113                         : "=d" (__res) : "a" (__src)            \
114                         : "a1", "d1", "d2", "memory");          \
115         __res;                                                  \
116 })
117
118 #define fp_conv_long2ext(dest, src) ({                          \
119         register struct fp_ext *__dest asm ("a0") = dest;       \
120         register int __src asm ("d0") = src;                    \
121                                                                 \
122         asm volatile ("jsr fp_conv_ext2long"                    \
123                         : : "d" (__src), "a" (__dest)           \
124                         : "a1", "d1", "d2", "memory");          \
125 })
126
127 #else /* __ASSEMBLY__ */
128
129 /*
130  * set, reset or clear a bit in the fp status register
131  */
132 .macro  fp_set_sr       bit
133         bset    #(\bit&7),(FPD_FPSR+3-(\bit/8),FPDATA)
134 .endm
135
136 .macro  fp_clr_sr       bit
137         bclr    #(\bit&7),(FPD_FPSR+3-(\bit/8),FPDATA)
138 .endm
139
140 .macro  fp_tst_sr       bit
141         btst    #(\bit&7),(FPD_FPSR+3-(\bit/8),FPDATA)
142 .endm
143
144 #endif /* __ASSEMBLY__ */
145
146 #endif /* _FP_EMU_H */