160 lines
4.5 KiB
C
160 lines
4.5 KiB
C
/*
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* reg_constant.c
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*
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* All of the constant FPU_REGs
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*
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*
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* Copyright (C) 1992, 1993 W. Metzenthen, 22 Parker St, Ormond,
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* Vic 3163, Australia.
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* E-mail apm233m@vaxc.cc.monash.edu.au
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* All rights reserved.
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*
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* This copyright notice covers the redistribution and use of the
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* FPU emulator developed by W. Metzenthen. It covers only its use
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* in the 386BSD operating system. Any other use is not permitted
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* under this copyright.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must include information specifying
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* that source code for the emulator is freely available and include
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* either:
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* a) an offer to provide the source code for a nominal distribution
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* fee, or
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* b) list at least two alternative methods whereby the source
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* can be obtained, e.g. a publically accessible bulletin board
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* and an anonymous ftp site from which the software can be
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* downloaded.
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* 3. All advertising materials specifically mentioning features or use of
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* this emulator must acknowledge that it was developed by W. Metzenthen.
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* 4. The name of W. Metzenthen may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* W. METZENTHEN BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include "param.h"
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#include "proc.h"
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#include "systm.h"
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#include "machine/cpu.h"
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#include "machine/pcb.h"
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#include "fpu_emu.h"
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#include "fpu_system.h"
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#include "status_w.h"
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#include "reg_constant.h"
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FPU_REG CONST_1 = {SIGN_POS, TW_Valid, EXP_BIAS,
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0x00000000, 0x80000000};
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FPU_REG CONST_2 = {SIGN_POS, TW_Valid, EXP_BIAS + 1,
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0x00000000, 0x80000000};
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FPU_REG CONST_HALF = {SIGN_POS, TW_Valid, EXP_BIAS - 1,
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0x00000000, 0x80000000};
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FPU_REG CONST_L2T = {SIGN_POS, TW_Valid, EXP_BIAS + 1,
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0xcd1b8afe, 0xd49a784b};
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FPU_REG CONST_L2E = {SIGN_POS, TW_Valid, EXP_BIAS,
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0x5c17f0bc, 0xb8aa3b29};
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FPU_REG CONST_PI = {SIGN_POS, TW_Valid, EXP_BIAS + 1,
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0x2168c235, 0xc90fdaa2};
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FPU_REG CONST_PI2 = {SIGN_POS, TW_Valid, EXP_BIAS,
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0x2168c235, 0xc90fdaa2};
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FPU_REG CONST_PI4 = {SIGN_POS, TW_Valid, EXP_BIAS - 1,
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0x2168c235, 0xc90fdaa2};
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FPU_REG CONST_LG2 = {SIGN_POS, TW_Valid, EXP_BIAS - 2,
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0xfbcff799, 0x9a209a84};
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FPU_REG CONST_LN2 = {SIGN_POS, TW_Valid, EXP_BIAS - 1,
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0xd1cf79ac, 0xb17217f7};
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/* Only the sign (and tag) is used in internal zeroes */
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FPU_REG CONST_Z = {SIGN_POS, TW_Zero, 0, 0x0, 0x0};
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/* Only the sign and significand (and tag) are used in internal NaNs */
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/* The 80486 never generates one of these
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FPU_REG CONST_SNAN = { SIGN_POS, TW_NaN, EXP_OVER, 0x00000001, 0x80000000 };
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*/
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/* This is the real indefinite QNaN */
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FPU_REG CONST_QNaN = {SIGN_NEG, TW_NaN, EXP_OVER, 0x00000000, 0xC0000000};
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/* Only the sign (and tag) is used in internal infinities */
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FPU_REG CONST_INF = {SIGN_POS, TW_Infinity, EXP_OVER, 0x00000000, 0x80000000};
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static void
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fld_const(FPU_REG * c)
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{
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FPU_REG *st_new_ptr;
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if (STACK_OVERFLOW) {
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stack_overflow();
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return;
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}
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push();
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reg_move(c, FPU_st0_ptr);
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status_word &= ~SW_C1;
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}
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static void
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fld1(void)
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{
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fld_const(&CONST_1);
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}
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static void
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fldl2t(void)
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{
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fld_const(&CONST_L2T);
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}
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static void
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fldl2e(void)
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{
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fld_const(&CONST_L2E);
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}
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static void
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fldpi(void)
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{
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fld_const(&CONST_PI);
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}
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static void
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fldlg2(void)
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{
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fld_const(&CONST_LG2);
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}
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static void
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fldln2(void)
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{
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fld_const(&CONST_LN2);
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}
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static void
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fldz(void)
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{
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fld_const(&CONST_Z);
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}
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static FUNC constants_table[] = {
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fld1, fldl2t, fldl2e, fldpi, fldlg2, fldln2, fldz, Un_impl
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};
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void
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fconst(void)
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{
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(constants_table[FPU_rm]) ();
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}
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