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369 lines
8.4 KiB
369 lines
8.4 KiB
20 years ago
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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
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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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#include "fpmodule.h"
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#include "fpmodule.inl"
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#include <asm/uaccess.h>
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static inline
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void loadSingle(const unsigned int Fn,const unsigned int *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
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void loadDouble(const unsigned int Fn,const unsigned int *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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get_user(p[0], &pMem[1]);
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get_user(p[1], &pMem[0]); /* sign & exponent */
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}
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static inline
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void loadExtended(const unsigned int Fn,const unsigned int *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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get_user(p[1], &pMem[2]); /* ls bits */
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get_user(p[2], &pMem[1]); /* ms bits */
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}
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static inline
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void loadMultiple(const unsigned int Fn,const unsigned int *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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{
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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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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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}
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}
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static inline
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void storeSingle(const unsigned int Fn,unsigned int *pMem)
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{
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FPA11 *fpa11 = GET_FPA11();
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union
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{
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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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{
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case typeDouble:
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val.f = float64_to_float32(fpa11->fpreg[Fn].fDouble);
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break;
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case typeExtended:
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val.f = floatx80_to_float32(fpa11->fpreg[Fn].fExtended);
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break;
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default: 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
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void storeDouble(const unsigned int Fn,unsigned int *pMem)
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{
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FPA11 *fpa11 = GET_FPA11();
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union
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{
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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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{
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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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case typeExtended:
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val.f = floatx80_to_float64(fpa11->fpreg[Fn].fExtended);
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break;
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default: val.f = fpa11->fpreg[Fn].fDouble;
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}
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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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}
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static inline
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void storeExtended(const unsigned int Fn,unsigned int *pMem)
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{
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FPA11 *fpa11 = GET_FPA11();
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union
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{
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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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{
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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: 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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put_user(val.i[1], &pMem[2]);
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put_user(val.i[2], &pMem[1]); /* msw */
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}
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static inline
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void storeMultiple(const unsigned int Fn,unsigned int *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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{
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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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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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}
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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 *pBase, *pAddress, *pFinal, nRc = 1,
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write_back = WRITE_BACK(opcode);
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//printk("PerformLDF(0x%08x), Fd = 0x%08x\n",opcode,getFd(opcode));
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pBase = (unsigned int*)readRegister(getRn(opcode));
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if (REG_PC == getRn(opcode))
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{
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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)) pAddress = pFinal; else pAddress = pBase;
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switch (opcode & MASK_TRANSFER_LENGTH)
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{
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case TRANSFER_SINGLE : loadSingle(getFd(opcode),pAddress); break;
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case TRANSFER_DOUBLE : loadDouble(getFd(opcode),pAddress); break;
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case TRANSFER_EXTENDED: loadExtended(getFd(opcode),pAddress); break;
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default: nRc = 0;
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}
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if (write_back) writeRegister(getRn(opcode),(unsigned int)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 *pBase, *pAddress, *pFinal, nRc = 1,
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write_back = WRITE_BACK(opcode);
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//printk("PerformSTF(0x%08x), Fd = 0x%08x\n",opcode,getFd(opcode));
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SetRoundingMode(ROUND_TO_NEAREST);
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pBase = (unsigned int*)readRegister(getRn(opcode));
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if (REG_PC == getRn(opcode))
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{
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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)) pAddress = pFinal; else pAddress = pBase;
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switch (opcode & MASK_TRANSFER_LENGTH)
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{
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case TRANSFER_SINGLE : storeSingle(getFd(opcode),pAddress); break;
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case TRANSFER_DOUBLE : storeDouble(getFd(opcode),pAddress); break;
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case TRANSFER_EXTENDED: storeExtended(getFd(opcode),pAddress); break;
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default: nRc = 0;
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}
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if (write_back) writeRegister(getRn(opcode),(unsigned int)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 i, Fd, *pBase, *pAddress, *pFinal,
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write_back = WRITE_BACK(opcode);
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pBase = (unsigned int*)readRegister(getRn(opcode));
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if (REG_PC == getRn(opcode))
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{
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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)) pAddress = pFinal; else pAddress = pBase;
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Fd = getFd(opcode);
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for (i=getRegisterCount(opcode);i>0;i--)
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{
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loadMultiple(Fd,pAddress);
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pAddress += 3; Fd++;
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if (Fd == 8) Fd = 0;
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}
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if (write_back) writeRegister(getRn(opcode),(unsigned int)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 i, Fd, *pBase, *pAddress, *pFinal,
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write_back = WRITE_BACK(opcode);
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pBase = (unsigned int*)readRegister(getRn(opcode));
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if (REG_PC == getRn(opcode))
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{
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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)) pAddress = pFinal; else pAddress = pBase;
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Fd = getFd(opcode);
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for (i=getRegisterCount(opcode);i>0;i--)
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{
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storeMultiple(Fd,pAddress);
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pAddress += 3; Fd++;
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if (Fd == 8) Fd = 0;
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}
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if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal);
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return 1;
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}
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#if 1
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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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//printk("EmulateCPDT(0x%08x)\n",opcode);
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if (LDF_OP(opcode))
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{
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nRc = PerformLDF(opcode);
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}
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else if (LFM_OP(opcode))
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{
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nRc = PerformLFM(opcode);
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}
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else if (STF_OP(opcode))
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{
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nRc = PerformSTF(opcode);
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}
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else if (SFM_OP(opcode))
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{
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nRc = PerformSFM(opcode);
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}
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else
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{
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nRc = 0;
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}
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return nRc;
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}
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#endif
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