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/*
* fp_emu.h
*
* Copyright Roman Zippel, 1997. All rights reserved.
*
* 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, and the entire permission notice in its entirety,
* including the disclaimer of warranties.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* ALTERNATIVELY, this product may be distributed under the terms of
* the GNU Public License, in which case the provisions of the GPL are
* required INSTEAD OF the above restrictions. (This clause is
* necessary due to a potential bad interaction between the GPL and
* the restrictions contained in a BSD-style copyright.)
*
* 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 THE AUTHOR 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.
*/
#ifndef _FP_EMU_H
#define _FP_EMU_H
#include "../kernel/m68k_defs.h"
#include <asm/math-emu.h>
#ifndef __ASSEMBLY__
#define IS_INF(a) ((a)->exp == 0x7fff)
#define IS_ZERO(a) ((a)->mant.m64 == 0)
#define fp_set_sr(bit) ({ \
FPDATA->fpsr |= 1 << (bit); \
})
#define fp_set_quotient(quotient) ({ \
FPDATA->fpsr &= 0xff00ffff; \
FPDATA->fpsr |= ((quotient) & 0xff) << 16; \
})
/* linkage for several useful functions */
/* Normalize the extended struct, return 0 for a NaN */
#define fp_normalize_ext(fpreg) ({ \
register struct fp_ext *reg asm ("a0") = fpreg; \
register int res asm ("d0"); \
\
asm volatile ("jsr fp_conv_ext2ext" \
: "=d" (res) : "a" (reg) \
: "a1", "d1", "d2", "memory"); \
res; \
})
#define fp_copy_ext(dest, src) ({ \
*dest = *src; \
})
#define fp_monadic_check(dest, src) ({ \
fp_copy_ext(dest, src); \
if (!fp_normalize_ext(dest)) \
return dest; \
})
#define fp_dyadic_check(dest, src) ({ \
if (!fp_normalize_ext(dest)) \
return dest; \
if (!fp_normalize_ext(src)) { \
fp_copy_ext(dest, src); \
return dest; \
} \
})
extern const struct fp_ext fp_QNaN;
extern const struct fp_ext fp_Inf;
#define fp_set_nan(dest) ({ \
fp_set_sr(FPSR_EXC_OPERR); \
*dest = fp_QNaN; \
})
/* TODO check rounding mode? */
#define fp_set_ovrflw(dest) ({ \
fp_set_sr(FPSR_EXC_OVFL); \
dest->exp = 0x7fff; \
dest->mant.m64 = 0; \
})
#define fp_conv_ext2long(src) ({ \
register struct fp_ext *__src asm ("a0") = src; \
register int __res asm ("d0"); \
\
asm volatile ("jsr fp_conv_ext2long" \
: "=d" (__res) : "a" (__src) \
: "a1", "d1", "d2", "memory"); \
__res; \
})
#else /* __ASSEMBLY__ */
/*
* set, reset or clear a bit in the fp status register
*/
.macro fp_set_sr bit
bset #(\bit&7),(FPD_FPSR+3-(\bit/8),FPDATA)
.endm
.macro fp_clr_sr bit
bclr #(\bit&7),(FPD_FPSR+3-(\bit/8),FPDATA)
.endm
.macro fp_tst_sr bit
btst #(\bit&7),(FPD_FPSR+3-(\bit/8),FPDATA)
.endm
#endif /* __ASSEMBLY__ */
#endif /* _FP_EMU_H */
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