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f148af2593
Patch from Richard Purdie NWFPE used global variables which meant it wasn't safe for use with preemptive kernels. This patch removes them and communicates the information between functions in a preempt safe manner. Generation of some exceptions was broken and this has also been corrected. Tests with glibc's maths test suite show no change in the results before/after this patch. Signed-off-by: Richard Purdie <rpurdie@rpsys.net> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
154 lines
4 KiB
C
154 lines
4 KiB
C
/*
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NetWinder Floating Point Emulator
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(c) Rebel.COM, 1998,1999
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Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "fpa11.h"
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#include "softfloat.h"
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#include "fpopcode.h"
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floatx80 floatx80_exp(floatx80 Fm);
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floatx80 floatx80_ln(floatx80 Fm);
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floatx80 floatx80_sin(floatx80 rFm);
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floatx80 floatx80_cos(floatx80 rFm);
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floatx80 floatx80_arcsin(floatx80 rFm);
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floatx80 floatx80_arctan(floatx80 rFm);
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floatx80 floatx80_log(floatx80 rFm);
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floatx80 floatx80_tan(floatx80 rFm);
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floatx80 floatx80_arccos(floatx80 rFm);
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floatx80 floatx80_pow(floatx80 rFn, floatx80 rFm);
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floatx80 floatx80_pol(floatx80 rFn, floatx80 rFm);
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static floatx80 floatx80_rsf(struct roundingData *roundData, floatx80 rFn, floatx80 rFm)
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{
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return floatx80_sub(roundData, rFm, rFn);
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}
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static floatx80 floatx80_rdv(struct roundingData *roundData, floatx80 rFn, floatx80 rFm)
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{
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return floatx80_div(roundData, rFm, rFn);
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}
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static floatx80 (*const dyadic_extended[16])(struct roundingData*, floatx80 rFn, floatx80 rFm) = {
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[ADF_CODE >> 20] = floatx80_add,
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[MUF_CODE >> 20] = floatx80_mul,
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[SUF_CODE >> 20] = floatx80_sub,
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[RSF_CODE >> 20] = floatx80_rsf,
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[DVF_CODE >> 20] = floatx80_div,
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[RDF_CODE >> 20] = floatx80_rdv,
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[RMF_CODE >> 20] = floatx80_rem,
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/* strictly, these opcodes should not be implemented */
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[FML_CODE >> 20] = floatx80_mul,
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[FDV_CODE >> 20] = floatx80_div,
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[FRD_CODE >> 20] = floatx80_rdv,
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};
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static floatx80 floatx80_mvf(struct roundingData *roundData, floatx80 rFm)
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{
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return rFm;
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}
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static floatx80 floatx80_mnf(struct roundingData *roundData, floatx80 rFm)
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{
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rFm.high ^= 0x8000;
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return rFm;
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}
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static floatx80 floatx80_abs(struct roundingData *roundData, floatx80 rFm)
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{
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rFm.high &= 0x7fff;
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return rFm;
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}
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static floatx80 (*const monadic_extended[16])(struct roundingData*, floatx80 rFm) = {
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[MVF_CODE >> 20] = floatx80_mvf,
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[MNF_CODE >> 20] = floatx80_mnf,
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[ABS_CODE >> 20] = floatx80_abs,
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[RND_CODE >> 20] = floatx80_round_to_int,
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[URD_CODE >> 20] = floatx80_round_to_int,
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[SQT_CODE >> 20] = floatx80_sqrt,
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[NRM_CODE >> 20] = floatx80_mvf,
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};
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unsigned int ExtendedCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd)
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{
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FPA11 *fpa11 = GET_FPA11();
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floatx80 rFm;
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unsigned int Fm, opc_mask_shift;
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Fm = getFm(opcode);
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if (CONSTANT_FM(opcode)) {
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rFm = getExtendedConstant(Fm);
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} else {
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switch (fpa11->fType[Fm]) {
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case typeSingle:
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rFm = float32_to_floatx80(fpa11->fpreg[Fm].fSingle);
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break;
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case typeDouble:
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rFm = float64_to_floatx80(fpa11->fpreg[Fm].fDouble);
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break;
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case typeExtended:
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rFm = fpa11->fpreg[Fm].fExtended;
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break;
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default:
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return 0;
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}
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}
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opc_mask_shift = (opcode & MASK_ARITHMETIC_OPCODE) >> 20;
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if (!MONADIC_INSTRUCTION(opcode)) {
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unsigned int Fn = getFn(opcode);
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floatx80 rFn;
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switch (fpa11->fType[Fn]) {
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case typeSingle:
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rFn = float32_to_floatx80(fpa11->fpreg[Fn].fSingle);
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break;
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case typeDouble:
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rFn = float64_to_floatx80(fpa11->fpreg[Fn].fDouble);
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break;
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case typeExtended:
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rFn = fpa11->fpreg[Fn].fExtended;
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break;
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default:
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return 0;
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}
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if (dyadic_extended[opc_mask_shift]) {
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rFd->fExtended = dyadic_extended[opc_mask_shift](roundData, rFn, rFm);
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} else {
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return 0;
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}
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} else {
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if (monadic_extended[opc_mask_shift]) {
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rFd->fExtended = monadic_extended[opc_mask_shift](roundData, rFm);
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} else {
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return 0;
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}
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}
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return 1;
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}
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