151 lines
4.2 KiB
C
151 lines
4.2 KiB
C
/* $NetBSD: ieee_internal.h,v 1.11 2006/05/14 21:55:39 elad Exp $ */
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/*
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* IEEE floating point support for NS32081 and NS32381 fpus.
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* Copyright (c) 1995 Ian Dall
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* IAN DALL ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION.
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* IAN DALL DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES
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* WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*/
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/*
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* File: ieee_internal.h
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* Author: Ian Dall
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* Date: November 1995
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*
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* Prototypes and structure definitions internal to the ieee exception
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* handling package.
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*
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*
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* HISTORY
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* 14-Dec-95 Ian Dall (Ian.Dall@dsto.defence.gov.au)
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* First release.
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*
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*/
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#ifndef _IEEE_INTERNAL_H_
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#define _IEEE_INTERNAL_H_
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#include "ieee_handler.h"
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#include "fpu_status.h"
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#ifdef DEBUG
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extern int ieee_handler_debug;
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#define DP(n, format, args...) \
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if (ieee_handler_debug >= n) printf(format, ## args)
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#else
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#define DP(n, format, args...)
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#endif
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enum format { fmt9, fmt11, fmt12};
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#define XOPCODE(fmt, opcode) ((opcode) << 2 | (fmt))
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#define MOVF XOPCODE(fmt11, 1)
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#define MOVLF XOPCODE(fmt9, 2)
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#define MOVFL XOPCODE(fmt9, 3)
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#define MOVIF XOPCODE(fmt9, 0)
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#define ROUNDFI XOPCODE(fmt9, 4)
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#define TRUNCFI XOPCODE(fmt9, 5)
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#define FLOORFI XOPCODE(fmt9, 7)
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#define ADDF XOPCODE(fmt11, 0)
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#define SUBF XOPCODE(fmt11, 4)
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#define MULF XOPCODE(fmt11, 12)
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#define DIVF XOPCODE(fmt11, 8)
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#define NEGF XOPCODE(fmt11, 5)
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#define ABSF XOPCODE(fmt11, 13)
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#define SCALBF XOPCODE(fmt12, 4)
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#define LOGBF XOPCODE(fmt12, 5)
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#define DOTF XOPCODE(fmt12, 3)
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#define POLYF XOPCODE(fmt12, 2)
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#define CMPF XOPCODE(fmt11, 2)
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#define LFSR XOPCODE(fmt9, 1)
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#define SFSR XOPCODE(fmt9, 6)
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union t_conv {
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double d;
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float f;
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struct {
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unsigned int mantissa2:32;
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unsigned int mantissa:20;
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unsigned int exp:11;
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unsigned int sign :1;
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} d_bits;
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struct {
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unsigned int mantissa:23;
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unsigned int exp:8;
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unsigned int sign :1;
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} f_bits;
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signed char c;
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short s;
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int i;
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};
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/* These assume "double" interpretation of the union is valid */
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#define ISNAN(data) \
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((data).d_bits.exp == 0x7ff && \
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((data).d_bits.mantissa != 0 || (data).d_bits.mantissa2 != 0))
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#define ISQNAN(data) \
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((data).d_bits.exp == 0x7ff && \
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((data).d_bits.mantissa & 0x80000) != 0)
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#define ISSNAN(data) \
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((data).d_bits.exp == 0x7ff && \
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((data).d_bits.mantissa & 0x80000) == 0 && \
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((data).d_bits.mantissa != 0 || (data).d_bits.mantissa2 != 0))
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#define ISINFTY(data) \
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((data).d_bits.exp == 0x7ff && (data).d_bits.mantissa == 0 && \
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(data).d_bits.mantissa2 == 0)
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#define ISDENORM(data) \
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((data).d_bits.exp == 0 && ((data).d_bits.mantissa != 0 || \
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(data).d_bits.mantissa2 != 0))
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#define ISZERO(data) \
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((data).d_bits.exp == 0 && (data).d_bits.mantissa == 0 && \
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(data).d_bits.mantissa2 == 0)
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#define EXP_DBIAS 1023
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#define EXP_FBIAS 127
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enum op_type {op_type_float, op_type_int};
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enum op_class {op_class_read, op_class_write, op_class_rmw, op_class_addr};
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enum op_where_tag { op_where_register, op_where_memory, op_where_immediate };
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extern const union t_conv infty;
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extern const union t_conv snan;
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extern const union t_conv qnan;
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struct operand {
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enum op_type type;
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enum op_class class;
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struct {
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enum op_where_tag tag;
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vaddr_t addr;
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} where;
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char size;
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union t_conv data;
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};
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int ieee_undfl(struct operand *, struct operand *, struct operand *, int,
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state *);
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int ieee_ovfl(struct operand *, struct operand *, struct operand *, int,
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state *);
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int ieee_dze(struct operand *, struct operand *, struct operand *, int,
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state *);
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int ieee_invop(struct operand *, struct operand *, struct operand *, int,
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state *);
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int ieee_add(double, double *);
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int ieee_mul(double, double *);
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int ieee_div(double, double *);
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int ieee_dot(double, double, double *);
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void ieee_cmp(double, double, state *);
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int ieee_normalize(union t_conv *);
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int ieee_scalb(double, double *);
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#endif /* _IEEE_INTERNAL_H_ */
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