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-rw-r--r--arch/arm/nwfpe/fpa11_cpdo.c125
1 files changed, 125 insertions, 0 deletions
diff --git a/arch/arm/nwfpe/fpa11_cpdo.c b/arch/arm/nwfpe/fpa11_cpdo.c
new file mode 100644
index 000000000..631333fc5
--- /dev/null
+++ b/arch/arm/nwfpe/fpa11_cpdo.c
@@ -0,0 +1,125 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ NetWinder Floating Point Emulator
+ (c) Rebel.COM, 1998,1999
+ (c) Philip Blundell, 2001
+
+ Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
+
+*/
+
+#include "fpa11.h"
+#include "fpopcode.h"
+
+unsigned int SingleCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd);
+unsigned int DoubleCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd);
+unsigned int ExtendedCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd);
+
+unsigned int EmulateCPDO(const unsigned int opcode)
+{
+ FPA11 *fpa11 = GET_FPA11();
+ FPREG *rFd;
+ unsigned int nType, nDest, nRc;
+ struct roundingData roundData;
+
+ /* Get the destination size. If not valid let Linux perform
+ an invalid instruction trap. */
+ nDest = getDestinationSize(opcode);
+ if (typeNone == nDest)
+ return 0;
+
+ roundData.mode = SetRoundingMode(opcode);
+ roundData.precision = SetRoundingPrecision(opcode);
+ roundData.exception = 0;
+
+ /* Compare the size of the operands in Fn and Fm.
+ Choose the largest size and perform operations in that size,
+ in order to make use of all the precision of the operands.
+ If Fm is a constant, we just grab a constant of a size
+ matching the size of the operand in Fn. */
+ if (MONADIC_INSTRUCTION(opcode))
+ nType = nDest;
+ else
+ nType = fpa11->fType[getFn(opcode)];
+
+ if (!CONSTANT_FM(opcode)) {
+ register unsigned int Fm = getFm(opcode);
+ if (nType < fpa11->fType[Fm]) {
+ nType = fpa11->fType[Fm];
+ }
+ }
+
+ rFd = &fpa11->fpreg[getFd(opcode)];
+
+ switch (nType) {
+ case typeSingle:
+ nRc = SingleCPDO(&roundData, opcode, rFd);
+ break;
+ case typeDouble:
+ nRc = DoubleCPDO(&roundData, opcode, rFd);
+ break;
+#ifdef CONFIG_FPE_NWFPE_XP
+ case typeExtended:
+ nRc = ExtendedCPDO(&roundData, opcode, rFd);
+ break;
+#endif
+ default:
+ nRc = 0;
+ }
+
+ /* The CPDO functions used to always set the destination type
+ to be the same as their working size. */
+
+ if (nRc != 0) {
+ /* If the operation succeeded, check to see if the result in the
+ destination register is the correct size. If not force it
+ to be. */
+
+ fpa11->fType[getFd(opcode)] = nDest;
+
+#ifdef CONFIG_FPE_NWFPE_XP
+ if (nDest != nType) {
+ switch (nDest) {
+ case typeSingle:
+ {
+ if (typeDouble == nType)
+ rFd->fSingle = float64_to_float32(&roundData, rFd->fDouble);
+ else
+ rFd->fSingle = floatx80_to_float32(&roundData, rFd->fExtended);
+ }
+ break;
+
+ case typeDouble:
+ {
+ if (typeSingle == nType)
+ rFd->fDouble = float32_to_float64(rFd->fSingle);
+ else
+ rFd->fDouble = floatx80_to_float64(&roundData, rFd->fExtended);
+ }
+ break;
+
+ case typeExtended:
+ {
+ if (typeSingle == nType)
+ rFd->fExtended = float32_to_floatx80(rFd->fSingle);
+ else
+ rFd->fExtended = float64_to_floatx80(rFd->fDouble);
+ }
+ break;
+ }
+ }
+#else
+ if (nDest != nType) {
+ if (nDest == typeSingle)
+ rFd->fSingle = float64_to_float32(&roundData, rFd->fDouble);
+ else
+ rFd->fDouble = float32_to_float64(rFd->fSingle);
+ }
+#endif
+ }
+
+ if (roundData.exception)
+ float_raise(roundData.exception);
+
+ return nRc;
+}