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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 */