forked from luck/tmp_suning_uos_patched
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>
139 lines
3.8 KiB
C
139 lines
3.8 KiB
C
/*
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NetWinder Floating Point Emulator
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(c) Rebel.COM, 1998,1999
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(c) Philip Blundell, 2001
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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 <linux/config.h>
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#include "fpa11.h"
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#include "fpopcode.h"
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unsigned int SingleCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd);
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unsigned int DoubleCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd);
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unsigned int ExtendedCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd);
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unsigned int EmulateCPDO(const unsigned int opcode)
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{
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FPA11 *fpa11 = GET_FPA11();
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FPREG *rFd;
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unsigned int nType, nDest, nRc;
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struct roundingData roundData;
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/* Get the destination size. If not valid let Linux perform
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an invalid instruction trap. */
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nDest = getDestinationSize(opcode);
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if (typeNone == nDest)
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return 0;
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roundData.mode = SetRoundingMode(opcode);
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roundData.precision = SetRoundingPrecision(opcode);
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roundData.exception = 0;
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/* Compare the size of the operands in Fn and Fm.
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Choose the largest size and perform operations in that size,
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in order to make use of all the precision of the operands.
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If Fm is a constant, we just grab a constant of a size
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matching the size of the operand in Fn. */
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if (MONADIC_INSTRUCTION(opcode))
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nType = nDest;
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else
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nType = fpa11->fType[getFn(opcode)];
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if (!CONSTANT_FM(opcode)) {
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register unsigned int Fm = getFm(opcode);
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if (nType < fpa11->fType[Fm]) {
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nType = fpa11->fType[Fm];
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}
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}
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rFd = &fpa11->fpreg[getFd(opcode)];
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switch (nType) {
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case typeSingle:
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nRc = SingleCPDO(&roundData, opcode, rFd);
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break;
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case typeDouble:
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nRc = DoubleCPDO(&roundData, opcode, rFd);
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break;
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#ifdef CONFIG_FPE_NWFPE_XP
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case typeExtended:
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nRc = ExtendedCPDO(&roundData, opcode, rFd);
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break;
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#endif
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default:
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nRc = 0;
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}
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/* The CPDO functions used to always set the destination type
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to be the same as their working size. */
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if (nRc != 0) {
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/* If the operation succeeded, check to see if the result in the
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destination register is the correct size. If not force it
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to be. */
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fpa11->fType[getFd(opcode)] = nDest;
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#ifdef CONFIG_FPE_NWFPE_XP
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if (nDest != nType) {
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switch (nDest) {
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case typeSingle:
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{
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if (typeDouble == nType)
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rFd->fSingle = float64_to_float32(&roundData, rFd->fDouble);
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else
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rFd->fSingle = floatx80_to_float32(&roundData, rFd->fExtended);
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}
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break;
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case typeDouble:
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{
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if (typeSingle == nType)
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rFd->fDouble = float32_to_float64(rFd->fSingle);
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else
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rFd->fDouble = floatx80_to_float64(&roundData, rFd->fExtended);
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}
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break;
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case typeExtended:
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{
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if (typeSingle == nType)
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rFd->fExtended = float32_to_floatx80(rFd->fSingle);
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else
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rFd->fExtended = float64_to_floatx80(rFd->fDouble);
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}
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break;
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}
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}
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#else
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if (nDest != nType) {
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if (nDest == typeSingle)
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rFd->fSingle = float64_to_float32(&roundData, rFd->fDouble);
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else
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rFd->fDouble = float32_to_float64(rFd->fSingle);
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}
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#endif
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}
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if (roundData.exception)
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float_raise(roundData.exception);
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return nRc;
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}
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