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fp_emu.h
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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/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 */