diff options
Diffstat (limited to 'sys/gnu/fpemul/reg_constant.c')
| -rw-r--r-- | sys/gnu/fpemul/reg_constant.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/sys/gnu/fpemul/reg_constant.c b/sys/gnu/fpemul/reg_constant.c new file mode 100644 index 0000000000000..f33427358e1ca --- /dev/null +++ b/sys/gnu/fpemul/reg_constant.c @@ -0,0 +1,175 @@ +/* + * reg_constant.c + * + * All of the constant FPU_REGs + * + * + * 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. + * + * + * $id:$ + * + */ + + + +#include "param.h" +#include "proc.h" +#include "systm.h" +#include "machine/cpu.h" +#include "machine/pcb.h" + +#include "fpu_emu.h" +#include "fpu_system.h" +#include "status_w.h" +#include "reg_constant.h" + + +FPU_REG CONST_1 = {SIGN_POS, TW_Valid, EXP_BIAS, +0x00000000, 0x80000000}; +FPU_REG CONST_2 = {SIGN_POS, TW_Valid, EXP_BIAS + 1, +0x00000000, 0x80000000}; +FPU_REG CONST_HALF = {SIGN_POS, TW_Valid, EXP_BIAS - 1, +0x00000000, 0x80000000}; +FPU_REG CONST_L2T = {SIGN_POS, TW_Valid, EXP_BIAS + 1, +0xcd1b8afe, 0xd49a784b}; +FPU_REG CONST_L2E = {SIGN_POS, TW_Valid, EXP_BIAS, +0x5c17f0bc, 0xb8aa3b29}; +FPU_REG CONST_PI = {SIGN_POS, TW_Valid, EXP_BIAS + 1, +0x2168c235, 0xc90fdaa2}; +FPU_REG CONST_PI2 = {SIGN_POS, TW_Valid, EXP_BIAS, +0x2168c235, 0xc90fdaa2}; +FPU_REG CONST_PI4 = {SIGN_POS, TW_Valid, EXP_BIAS - 1, +0x2168c235, 0xc90fdaa2}; +FPU_REG CONST_LG2 = {SIGN_POS, TW_Valid, EXP_BIAS - 2, +0xfbcff799, 0x9a209a84}; +FPU_REG CONST_LN2 = {SIGN_POS, TW_Valid, EXP_BIAS - 1, +0xd1cf79ac, 0xb17217f7}; +/* Only the sign (and tag) is used in internal zeroes */ +FPU_REG CONST_Z = {SIGN_POS, TW_Zero, 0, 0x0, 0x0}; +/* Only the sign and significand (and tag) are used in internal NaNs */ +/* The 80486 never generates one of these +FPU_REG CONST_SNAN = { SIGN_POS, TW_NaN, EXP_OVER, 0x00000001, 0x80000000 }; + */ +/* This is the real indefinite QNaN */ +FPU_REG CONST_QNaN = {SIGN_NEG, TW_NaN, EXP_OVER, 0x00000000, 0xC0000000}; +/* Only the sign (and tag) is used in internal infinities */ +FPU_REG CONST_INF = {SIGN_POS, TW_Infinity, EXP_OVER, 0x00000000, 0x80000000}; + + + +static void +fld_const(FPU_REG * c) +{ + FPU_REG *st_new_ptr; + + if (STACK_OVERFLOW) { + stack_overflow(); + return; + } + push(); + reg_move(c, FPU_st0_ptr); + status_word &= ~SW_C1; +} + + +static void +fld1(void) +{ + fld_const(&CONST_1); +} + +static void +fldl2t(void) +{ + fld_const(&CONST_L2T); +} + +static void +fldl2e(void) +{ + fld_const(&CONST_L2E); +} + +static void +fldpi(void) +{ + fld_const(&CONST_PI); +} + +static void +fldlg2(void) +{ + fld_const(&CONST_LG2); +} + +static void +fldln2(void) +{ + fld_const(&CONST_LN2); +} + +static void +fldz(void) +{ + fld_const(&CONST_Z); +} + +static FUNC constants_table[] = { + fld1, fldl2t, fldl2e, fldpi, fldlg2, fldln2, fldz, Un_impl +}; + +void +fconst(void) +{ + (constants_table[FPU_rm]) (); +} |