396 lines
8.2 KiB
C
396 lines
8.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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NetWinder Floating Point Emulator
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(c) Rebel.com, 1998-1999
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(c) Philip Blundell, 1998, 2001
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Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
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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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#include "fpmodule.h"
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#include "fpmodule.inl"
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#include <linux/uaccess.h>
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static inline void loadSingle(const unsigned int Fn, const unsigned int __user *pMem)
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{
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FPA11 *fpa11 = GET_FPA11();
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fpa11->fType[Fn] = typeSingle;
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get_user(fpa11->fpreg[Fn].fSingle, pMem);
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}
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static inline void loadDouble(const unsigned int Fn, const unsigned int __user *pMem)
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{
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FPA11 *fpa11 = GET_FPA11();
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unsigned int *p;
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p = (unsigned int *) &fpa11->fpreg[Fn].fDouble;
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fpa11->fType[Fn] = typeDouble;
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#ifdef __ARMEB__
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get_user(p[0], &pMem[0]); /* sign & exponent */
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get_user(p[1], &pMem[1]);
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#else
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get_user(p[0], &pMem[1]);
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get_user(p[1], &pMem[0]); /* sign & exponent */
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#endif
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}
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#ifdef CONFIG_FPE_NWFPE_XP
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static inline void loadExtended(const unsigned int Fn, const unsigned int __user *pMem)
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{
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FPA11 *fpa11 = GET_FPA11();
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unsigned int *p;
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p = (unsigned int *) &fpa11->fpreg[Fn].fExtended;
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fpa11->fType[Fn] = typeExtended;
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get_user(p[0], &pMem[0]); /* sign & exponent */
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#ifdef __ARMEB__
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get_user(p[1], &pMem[1]); /* ms bits */
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get_user(p[2], &pMem[2]); /* ls bits */
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#else
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get_user(p[1], &pMem[2]); /* ls bits */
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get_user(p[2], &pMem[1]); /* ms bits */
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#endif
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}
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#endif
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static inline void loadMultiple(const unsigned int Fn, const unsigned int __user *pMem)
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{
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FPA11 *fpa11 = GET_FPA11();
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register unsigned int *p;
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unsigned long x;
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p = (unsigned int *) &(fpa11->fpreg[Fn]);
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get_user(x, &pMem[0]);
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fpa11->fType[Fn] = (x >> 14) & 0x00000003;
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switch (fpa11->fType[Fn]) {
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case typeSingle:
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case typeDouble:
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{
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get_user(p[0], &pMem[2]); /* Single */
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get_user(p[1], &pMem[1]); /* double msw */
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p[2] = 0; /* empty */
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}
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break;
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#ifdef CONFIG_FPE_NWFPE_XP
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case typeExtended:
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{
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get_user(p[1], &pMem[2]);
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get_user(p[2], &pMem[1]); /* msw */
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p[0] = (x & 0x80003fff);
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}
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break;
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#endif
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}
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}
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static inline void storeSingle(struct roundingData *roundData, const unsigned int Fn, unsigned int __user *pMem)
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{
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FPA11 *fpa11 = GET_FPA11();
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union {
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float32 f;
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unsigned int i[1];
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} val;
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switch (fpa11->fType[Fn]) {
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case typeDouble:
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val.f = float64_to_float32(roundData, fpa11->fpreg[Fn].fDouble);
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break;
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#ifdef CONFIG_FPE_NWFPE_XP
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case typeExtended:
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val.f = floatx80_to_float32(roundData, fpa11->fpreg[Fn].fExtended);
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break;
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#endif
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default:
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val.f = fpa11->fpreg[Fn].fSingle;
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}
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put_user(val.i[0], pMem);
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}
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static inline void storeDouble(struct roundingData *roundData, const unsigned int Fn, unsigned int __user *pMem)
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{
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FPA11 *fpa11 = GET_FPA11();
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union {
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float64 f;
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unsigned int i[2];
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} val;
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switch (fpa11->fType[Fn]) {
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case typeSingle:
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val.f = float32_to_float64(fpa11->fpreg[Fn].fSingle);
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break;
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#ifdef CONFIG_FPE_NWFPE_XP
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case typeExtended:
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val.f = floatx80_to_float64(roundData, fpa11->fpreg[Fn].fExtended);
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break;
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#endif
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default:
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val.f = fpa11->fpreg[Fn].fDouble;
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}
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#ifdef __ARMEB__
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put_user(val.i[0], &pMem[0]); /* msw */
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put_user(val.i[1], &pMem[1]); /* lsw */
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#else
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put_user(val.i[1], &pMem[0]); /* msw */
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put_user(val.i[0], &pMem[1]); /* lsw */
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#endif
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}
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#ifdef CONFIG_FPE_NWFPE_XP
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static inline void storeExtended(const unsigned int Fn, unsigned int __user *pMem)
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{
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FPA11 *fpa11 = GET_FPA11();
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union {
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floatx80 f;
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unsigned int i[3];
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} val;
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switch (fpa11->fType[Fn]) {
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case typeSingle:
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val.f = float32_to_floatx80(fpa11->fpreg[Fn].fSingle);
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break;
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case typeDouble:
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val.f = float64_to_floatx80(fpa11->fpreg[Fn].fDouble);
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break;
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default:
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val.f = fpa11->fpreg[Fn].fExtended;
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}
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put_user(val.i[0], &pMem[0]); /* sign & exp */
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#ifdef __ARMEB__
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put_user(val.i[1], &pMem[1]); /* msw */
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put_user(val.i[2], &pMem[2]);
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#else
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put_user(val.i[1], &pMem[2]);
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put_user(val.i[2], &pMem[1]); /* msw */
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#endif
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}
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#endif
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static inline void storeMultiple(const unsigned int Fn, unsigned int __user *pMem)
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{
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FPA11 *fpa11 = GET_FPA11();
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register unsigned int nType, *p;
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p = (unsigned int *) &(fpa11->fpreg[Fn]);
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nType = fpa11->fType[Fn];
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switch (nType) {
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case typeSingle:
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case typeDouble:
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{
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put_user(p[0], &pMem[2]); /* single */
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put_user(p[1], &pMem[1]); /* double msw */
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put_user(nType << 14, &pMem[0]);
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}
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break;
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#ifdef CONFIG_FPE_NWFPE_XP
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case typeExtended:
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{
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put_user(p[2], &pMem[1]); /* msw */
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put_user(p[1], &pMem[2]);
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put_user((p[0] & 0x80003fff) | (nType << 14), &pMem[0]);
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}
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break;
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#endif
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}
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}
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unsigned int PerformLDF(const unsigned int opcode)
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{
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unsigned int __user *pBase, *pAddress, *pFinal;
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unsigned int nRc = 1, write_back = WRITE_BACK(opcode);
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pBase = (unsigned int __user *) readRegister(getRn(opcode));
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if (REG_PC == getRn(opcode)) {
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pBase += 2;
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write_back = 0;
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}
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pFinal = pBase;
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if (BIT_UP_SET(opcode))
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pFinal += getOffset(opcode);
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else
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pFinal -= getOffset(opcode);
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if (PREINDEXED(opcode))
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pAddress = pFinal;
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else
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pAddress = pBase;
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switch (opcode & MASK_TRANSFER_LENGTH) {
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case TRANSFER_SINGLE:
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loadSingle(getFd(opcode), pAddress);
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break;
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case TRANSFER_DOUBLE:
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loadDouble(getFd(opcode), pAddress);
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break;
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#ifdef CONFIG_FPE_NWFPE_XP
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case TRANSFER_EXTENDED:
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loadExtended(getFd(opcode), pAddress);
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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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if (write_back)
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writeRegister(getRn(opcode), (unsigned long) pFinal);
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return nRc;
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}
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unsigned int PerformSTF(const unsigned int opcode)
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{
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unsigned int __user *pBase, *pAddress, *pFinal;
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unsigned int nRc = 1, write_back = WRITE_BACK(opcode);
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struct roundingData roundData;
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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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pBase = (unsigned int __user *) readRegister(getRn(opcode));
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if (REG_PC == getRn(opcode)) {
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pBase += 2;
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write_back = 0;
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}
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pFinal = pBase;
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if (BIT_UP_SET(opcode))
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pFinal += getOffset(opcode);
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else
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pFinal -= getOffset(opcode);
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if (PREINDEXED(opcode))
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pAddress = pFinal;
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else
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pAddress = pBase;
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switch (opcode & MASK_TRANSFER_LENGTH) {
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case TRANSFER_SINGLE:
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storeSingle(&roundData, getFd(opcode), pAddress);
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break;
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case TRANSFER_DOUBLE:
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storeDouble(&roundData, getFd(opcode), pAddress);
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break;
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#ifdef CONFIG_FPE_NWFPE_XP
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case TRANSFER_EXTENDED:
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storeExtended(getFd(opcode), pAddress);
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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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if (roundData.exception)
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float_raise(roundData.exception);
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if (write_back)
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writeRegister(getRn(opcode), (unsigned long) pFinal);
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return nRc;
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}
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unsigned int PerformLFM(const unsigned int opcode)
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{
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unsigned int __user *pBase, *pAddress, *pFinal;
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unsigned int i, Fd, write_back = WRITE_BACK(opcode);
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pBase = (unsigned int __user *) readRegister(getRn(opcode));
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if (REG_PC == getRn(opcode)) {
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pBase += 2;
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write_back = 0;
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}
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pFinal = pBase;
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if (BIT_UP_SET(opcode))
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pFinal += getOffset(opcode);
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else
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pFinal -= getOffset(opcode);
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if (PREINDEXED(opcode))
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pAddress = pFinal;
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else
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pAddress = pBase;
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Fd = getFd(opcode);
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for (i = getRegisterCount(opcode); i > 0; i--) {
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loadMultiple(Fd, pAddress);
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pAddress += 3;
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Fd++;
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if (Fd == 8)
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Fd = 0;
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}
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if (write_back)
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writeRegister(getRn(opcode), (unsigned long) pFinal);
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return 1;
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}
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unsigned int PerformSFM(const unsigned int opcode)
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{
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unsigned int __user *pBase, *pAddress, *pFinal;
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unsigned int i, Fd, write_back = WRITE_BACK(opcode);
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pBase = (unsigned int __user *) readRegister(getRn(opcode));
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if (REG_PC == getRn(opcode)) {
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pBase += 2;
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write_back = 0;
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}
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pFinal = pBase;
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if (BIT_UP_SET(opcode))
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pFinal += getOffset(opcode);
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else
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pFinal -= getOffset(opcode);
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if (PREINDEXED(opcode))
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pAddress = pFinal;
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else
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pAddress = pBase;
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Fd = getFd(opcode);
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for (i = getRegisterCount(opcode); i > 0; i--) {
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storeMultiple(Fd, pAddress);
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pAddress += 3;
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Fd++;
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if (Fd == 8)
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Fd = 0;
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}
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if (write_back)
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writeRegister(getRn(opcode), (unsigned long) pFinal);
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return 1;
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}
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unsigned int EmulateCPDT(const unsigned int opcode)
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{
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unsigned int nRc = 0;
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if (LDF_OP(opcode)) {
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nRc = PerformLDF(opcode);
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} else if (LFM_OP(opcode)) {
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nRc = PerformLFM(opcode);
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|
} else if (STF_OP(opcode)) {
|
||
|
|
nRc = PerformSTF(opcode);
|
||
|
|
} else if (SFM_OP(opcode)) {
|
||
|
|
nRc = PerformSFM(opcode);
|
||
|
|
} else {
|
||
|
|
nRc = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
return nRc;
|
||
|
|
}
|