/* * fpu_emu.h * * * Copyright (C) 1992,1993,1994 * W. Metzenthen, 22 Parker St, Ormond, Vic 3163, * Australia. E-mail billm@vaxc.cc.monash.edu.au * All rights reserved. * * This copyright notice covers the redistribution and use of the * FPU emulator developed by W. Metzenthen. It covers only its use * in the 386BSD, FreeBSD and NetBSD operating systems. Any other * use is not permitted under this copyright. * * 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, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must include information specifying * that source code for the emulator is freely available and include * either: * a) an offer to provide the source code for a nominal distribution * fee, or * b) list at least two alternative methods whereby the source * can be obtained, e.g. a publically accessible bulletin board * and an anonymous ftp site from which the software can be * downloaded. * 3. All advertising materials specifically mentioning features or use of * this emulator must acknowledge that it was developed by W. Metzenthen. * 4. The name of W. Metzenthen may not be used to endorse or promote * products derived from this software without specific prior written * permission. * * 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 * W. METZENTHEN 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. * * * The purpose of this copyright, based upon the Berkeley copyright, is to * ensure that the covered software remains freely available to everyone. * * The software (with necessary differences) is also available, but under * the terms of the GNU copyleft, for the Linux operating system and for * the djgpp ms-dos extender. * * W. Metzenthen June 1994. * * * $Id: fpu_emu.h,v 1.2 1994/04/29 21:16:20 gclarkii Exp $ * */ #ifndef _FPU_EMU_H_ #define _FPU_EMU_H_ /* * Define DENORM_OPERAND to make the emulator detect denormals * and use the denormal flag of the status word. Note: this only * affects the flag and corresponding interrupt, the emulator * will always generate denormals and operate upon them as required. */ #define DENORM_OPERAND /* * Define PECULIAR_486 to get a closer approximation to 80486 behaviour, * rather than behaviour which appears to be cleaner. * This is a matter of opinion: for all I know, the 80486 may simply * be complying with the IEEE spec. Maybe one day I'll get to see the * spec... */ #define PECULIAR_486 #ifdef LOCORE #include "fpu_asm.h" #define Const(x) $/**/x #else #define Const(x) x #endif #define EXP_BIAS Const(0) #define EXP_OVER Const(0x4000) /* smallest invalid large exponent */ #define EXP_UNDER Const(-0x3fff) /* largest invalid small exponent */ #define SIGN_POS Const(0) #define SIGN_NEG Const(1) /* Keep the order TW_Valid, TW_Zero, TW_Denormal */ #define TW_Valid Const(0)/* valid */ #define TW_Zero Const(1)/* zero */ /* The following fold to 2 (Special) in the Tag Word */ #define TW_Denormal Const(4)/* De-normal */ #define TW_Infinity Const(5)/* + or - infinity */ #define TW_NaN Const(6)/* Not a Number */ #define TW_Empty Const(7)/* empty */ /* #define TW_FPU_Interrupt Const(0x80) *//* Signals an interrupt */ #ifndef LOCORE #include "types.h" #include "math_emu.h" #ifdef PARANOID extern char emulating; #define REENTRANT_CHECK(state) emulating = (state) #define ON 1 #define OFF 0 #else #define REENTRANT_CHECK(state) #endif /* PARANOID */ typedef void (*FUNC) (void); typedef struct fpu_reg FPU_REG; #define st(x) ( regs[((top+x) &7 )] ) #define STACK_OVERFLOW (st_new_ptr = &st(-1), st_new_ptr->tag != TW_Empty) #define NOT_EMPTY(i) (st(i).tag != TW_Empty) #define NOT_EMPTY_0 (FPU_st0_tag ^ TW_Empty) extern unsigned char FPU_rm; extern char FPU_st0_tag; extern FPU_REG *FPU_st0_ptr; extern void *FPU_data_address; extern FPU_REG FPU_loaded_data; #define pop() { FPU_st0_ptr->tag = TW_Empty; top++; } /* push() does not affect the tags */ #define push() { top--; FPU_st0_ptr = st_new_ptr; } #define reg_move(x, y) { \ *(short *)&((y)->sign) = *(short *)&((x)->sign); \ *(long *)&((y)->exp) = *(long *)&((x)->exp); \ *(long long *)&((y)->sigl) = *(long long *)&((x)->sigl); } /*----- Prototypes for functions written in assembler -----*/ /* extern void reg_move(FPU_REG *a, FPU_REG *b); */ extern void mul64(long long *a, long long *b, long long *result); extern void poly_div2(long long *x); extern void poly_div4(long long *x); extern void poly_div16(long long *x); extern void polynomial(unsigned accum[], unsigned x[], unsigned short terms[][4], int n); extern void normalize(FPU_REG * x); extern void normalize_nuo(FPU_REG * x); extern void reg_div(FPU_REG * arg1, FPU_REG * arg2, FPU_REG * answ, unsigned int control_w); extern void reg_u_sub(FPU_REG * arg1, FPU_REG * arg2, FPU_REG * answ, unsigned int control_w); extern void reg_u_mul(FPU_REG * arg1, FPU_REG * arg2, FPU_REG * answ, unsigned int control_w); extern void reg_u_div(FPU_REG * arg1, FPU_REG * arg2, FPU_REG * answ, unsigned int control_w); extern void reg_u_add(FPU_REG * arg1, FPU_REG * arg2, FPU_REG * answ, unsigned int control_w); extern void wm_sqrt(FPU_REG * n, unsigned int control_w); extern unsigned shrx(void *l, unsigned x); extern unsigned shrxs(void *v, unsigned x); extern unsigned long div_small(unsigned long long *x, unsigned long y); extern void round_reg(FPU_REG * arg, unsigned int extent, unsigned int control_w); #ifndef MAKING_PROTO #include "fpu_proto.h" #endif #endif /* LOCORE */ #endif /* _FPU_EMU_H_ */