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/Ethereal-msm8939-beta9/arch/m68k/math-emu/fp_emu.h

https://bitbucket.org/MilosStamenkovic95/etherealos
C Header | 146 lines | 81 code | 23 blank | 42 comment | 5 complexity | f351108964be032920a86ce6a81e0d90 MD5 | raw file
  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
 93extern const struct fp_ext fp_QNaN;
 94extern 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 */