/* NetWinder Floating Point Emulator (c) Rebel.com, 1998-1999 (c) Philip Blundell, 1998, 2001 Direct questions, comments to Scott Bambrough <scottb@netwinder.org> This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "fpa11.h" #include "softfloat.h" #include "fpopcode.h" #include "fpmodule.h" #include "fpmodule.inl" #include <linux/uaccess.h> static inline void loadSingle(const unsigned int Fn, const unsigned int __user *pMem) { FPA11 *fpa11 = GET_FPA11(); fpa11->fType[Fn] = typeSingle; get_user(fpa11->fpreg[Fn].fSingle, pMem); } static inline void loadDouble(const unsigned int Fn, const unsigned int __user *pMem) { FPA11 *fpa11 = GET_FPA11(); unsigned int *p; p = (unsigned int *) &fpa11->fpreg[Fn].fDouble; fpa11->fType[Fn] = typeDouble; #ifdef __ARMEB__ get_user(p[0], &pMem[0]); /* sign & exponent */ get_user(p[1], &pMem[1]); #else get_user(p[0], &pMem[1]); get_user(p[1], &pMem[0]); /* sign & exponent */ #endif } #ifdef CONFIG_FPE_NWFPE_XP static inline void loadExtended(const unsigned int Fn, const unsigned int __user *pMem) { FPA11 *fpa11 = GET_FPA11(); unsigned int *p; p = (unsigned int *) &fpa11->fpreg[Fn].fExtended; fpa11->fType[Fn] = typeExtended; get_user(p[0], &pMem[0]); /* sign & exponent */ #ifdef __ARMEB__ get_user(p[1], &pMem[1]); /* ms bits */ get_user(p[2], &pMem[2]); /* ls bits */ #else get_user(p[1], &pMem[2]); /* ls bits */ get_user(p[2], &pMem[1]); /* ms bits */ #endif } #endif static inline void loadMultiple(const unsigned int Fn, const unsigned int __user *pMem) { FPA11 *fpa11 = GET_FPA11(); register unsigned int *p; unsigned long x; p = (unsigned int *) &(fpa11->fpreg[Fn]); get_user(x, &pMem[0]); fpa11->fType[Fn] = (x >> 14) & 0x00000003; switch (fpa11->fType[Fn]) { case typeSingle: case typeDouble: { get_user(p[0], &pMem[2]); /* Single */ get_user(p[1], &pMem[1]); /* double msw */ p[2] = 0; /* empty */ } break; #ifdef CONFIG_FPE_NWFPE_XP case typeExtended: { get_user(p[1], &pMem[2]); get_user(p[2], &pMem[1]); /* msw */ p[0] = (x & 0x80003fff); } break; #endif } } static inline void storeSingle(struct roundingData *roundData, const unsigned int Fn, unsigned int __user *pMem) { FPA11 *fpa11 = GET_FPA11(); union { float32 f; unsigned int i[1]; } val; switch (fpa11->fType[Fn]) { case typeDouble: val.f = float64_to_float32(roundData, fpa11->fpreg[Fn].fDouble); break; #ifdef CONFIG_FPE_NWFPE_XP case typeExtended: val.f = floatx80_to_float32(roundData, fpa11->fpreg[Fn].fExtended); break; #endif default: val.f = fpa11->fpreg[Fn].fSingle; } put_user(val.i[0], pMem); } static inline void storeDouble(struct roundingData *roundData, const unsigned int Fn, unsigned int __user *pMem) { FPA11 *fpa11 = GET_FPA11(); union { float64 f; unsigned int i[2]; } val; switch (fpa11->fType[Fn]) { case typeSingle: val.f = float32_to_float64(fpa11->fpreg[Fn].fSingle); break; #ifdef CONFIG_FPE_NWFPE_XP case typeExtended: val.f = floatx80_to_float64(roundData, fpa11->fpreg[Fn].fExtended); break; #endif default: val.f = fpa11->fpreg[Fn].fDouble; } #ifdef __ARMEB__ put_user(val.i[0], &pMem[0]); /* msw */ put_user(val.i[1], &pMem[1]); /* lsw */ #else put_user(val.i[1], &pMem[0]); /* msw */ put_user(val.i[0], &pMem[1]); /* lsw */ #endif } #ifdef CONFIG_FPE_NWFPE_XP static inline void storeExtended(const unsigned int Fn, unsigned int __user *pMem) { FPA11 *fpa11 = GET_FPA11(); union { floatx80 f; unsigned int i[3]; } val; switch (fpa11->fType[Fn]) { case typeSingle: val.f = float32_to_floatx80(fpa11->fpreg[Fn].fSingle); break; case typeDouble: val.f = float64_to_floatx80(fpa11->fpreg[Fn].fDouble); break; default: val.f = fpa11->fpreg[Fn].fExtended; } put_user(val.i[0], &pMem[0]); /* sign & exp */ #ifdef __ARMEB__ put_user(val.i[1], &pMem[1]); /* msw */ put_user(val.i[2], &pMem[2]); #else put_user(val.i[1], &pMem[2]); put_user(val.i[2], &pMem[1]); /* msw */ #endif } #endif static inline void storeMultiple(const unsigned int Fn, unsigned int __user *pMem) { FPA11 *fpa11 = GET_FPA11(); register unsigned int nType, *p; p = (unsigned int *) &(fpa11->fpreg[Fn]); nType = fpa11->fType[Fn]; switch (nType) { case typeSingle: case typeDouble: { put_user(p[0], &pMem[2]); /* single */ put_user(p[1], &pMem[1]); /* double msw */ put_user(nType << 14, &pMem[0]); } break; #ifdef CONFIG_FPE_NWFPE_XP case typeExtended: { put_user(p[2], &pMem[1]); /* msw */ put_user(p[1], &pMem[2]); put_user((p[0] & 0x80003fff) | (nType << 14), &pMem[0]); } break; #endif } } unsigned int PerformLDF(const unsigned int opcode) { unsigned int __user *pBase, *pAddress, *pFinal; unsigned int nRc = 1, write_back = WRITE_BACK(opcode); pBase = (unsigned int __user *) readRegister(getRn(opcode)); if (REG_PC == getRn(opcode)) { pBase += 2; write_back = 0; } pFinal = pBase; if (BIT_UP_SET(opcode)) pFinal += getOffset(opcode); else pFinal -= getOffset(opcode); if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase; switch (opcode & MASK_TRANSFER_LENGTH) { case TRANSFER_SINGLE: loadSingle(getFd(opcode), pAddress); break; case TRANSFER_DOUBLE: loadDouble(getFd(opcode), pAddress); break; #ifdef CONFIG_FPE_NWFPE_XP case TRANSFER_EXTENDED: loadExtended(getFd(opcode), pAddress); break; #endif default: nRc = 0; } if (write_back) writeRegister(getRn(opcode), (unsigned long) pFinal); return nRc; } unsigned int PerformSTF(const unsigned int opcode) { unsigned int __user *pBase, *pAddress, *pFinal; unsigned int nRc = 1, write_back = WRITE_BACK(opcode); struct roundingData roundData; roundData.mode = SetRoundingMode(opcode); roundData.precision = SetRoundingPrecision(opcode); roundData.exception = 0; pBase = (unsigned int __user *) readRegister(getRn(opcode)); if (REG_PC == getRn(opcode)) { pBase += 2; write_back = 0; } pFinal = pBase; if (BIT_UP_SET(opcode)) pFinal += getOffset(opcode); else pFinal -= getOffset(opcode); if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase; switch (opcode & MASK_TRANSFER_LENGTH) { case TRANSFER_SINGLE: storeSingle(&roundData, getFd(opcode), pAddress); break; case TRANSFER_DOUBLE: storeDouble(&roundData, getFd(opcode), pAddress); break; #ifdef CONFIG_FPE_NWFPE_XP case TRANSFER_EXTENDED: storeExtended(getFd(opcode), pAddress); break; #endif default: nRc = 0; } if (roundData.exception) float_raise(roundData.exception); if (write_back) writeRegister(getRn(opcode), (unsigned long) pFinal); return nRc; } unsigned int PerformLFM(const unsigned int opcode) { unsigned int __user *pBase, *pAddress, *pFinal; unsigned int i, Fd, write_back = WRITE_BACK(opcode); pBase = (unsigned int __user *) readRegister(getRn(opcode)); if (REG_PC == getRn(opcode)) { pBase += 2; write_back = 0; } pFinal = pBase; if (BIT_UP_SET(opcode)) pFinal += getOffset(opcode); else pFinal -= getOffset(opcode); if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase; Fd = getFd(opcode); for (i = getRegisterCount(opcode); i > 0; i--) { loadMultiple(Fd, pAddress); pAddress += 3; Fd++; if (Fd == 8) Fd = 0; } if (write_back) writeRegister(getRn(opcode), (unsigned long) pFinal); return 1; } unsigned int PerformSFM(const unsigned int opcode) { unsigned int __user *pBase, *pAddress, *pFinal; unsigned int i, Fd, write_back = WRITE_BACK(opcode); pBase = (unsigned int __user *) readRegister(getRn(opcode)); if (REG_PC == getRn(opcode)) { pBase += 2; write_back = 0; } pFinal = pBase; if (BIT_UP_SET(opcode)) pFinal += getOffset(opcode); else pFinal -= getOffset(opcode); if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase; Fd = getFd(opcode); for (i = getRegisterCount(opcode); i > 0; i--) { storeMultiple(Fd, pAddress); pAddress += 3; Fd++; if (Fd == 8) Fd = 0; } if (write_back) writeRegister(getRn(opcode), (unsigned long) pFinal); return 1; } unsigned int EmulateCPDT(const unsigned int opcode) { unsigned int nRc = 0; if (LDF_OP(opcode)) { nRc = PerformLDF(opcode); } else if (LFM_OP(opcode)) { nRc = PerformLFM(opcode); } else if (STF_OP(opcode)) { nRc = PerformSTF(opcode); } else if (SFM_OP(opcode)) { nRc = PerformSFM(opcode); } else { nRc = 0; } return nRc; }