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-rw-r--r--arch/arm26/nwfpe/fpa11_cpdt.c368
1 files changed, 368 insertions, 0 deletions
diff --git a/arch/arm26/nwfpe/fpa11_cpdt.c b/arch/arm26/nwfpe/fpa11_cpdt.c
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+++ b/arch/arm26/nwfpe/fpa11_cpdt.c
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+/*
+ NetWinder Floating Point Emulator
+ (c) Rebel.com, 1998-1999
+ (c) Philip Blundell, 1998
+
+ 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 <asm/uaccess.h>
+
+static inline
+void loadSingle(const unsigned int Fn,const unsigned int *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 *pMem)
+{
+ FPA11 *fpa11 = GET_FPA11();
+ unsigned int *p;
+ p = (unsigned int*)&fpa11->fpreg[Fn].fDouble;
+ fpa11->fType[Fn] = typeDouble;
+ get_user(p[0], &pMem[1]);
+ get_user(p[1], &pMem[0]); /* sign & exponent */
+}
+
+static inline
+void loadExtended(const unsigned int Fn,const unsigned int *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 */
+ get_user(p[1], &pMem[2]); /* ls bits */
+ get_user(p[2], &pMem[1]); /* ms bits */
+}
+
+static inline
+void loadMultiple(const unsigned int Fn,const unsigned int *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;
+
+ case typeExtended:
+ {
+ get_user(p[1], &pMem[2]);
+ get_user(p[2], &pMem[1]); /* msw */
+ p[0] = (x & 0x80003fff);
+ }
+ break;
+ }
+}
+
+static inline
+void storeSingle(const unsigned int Fn,unsigned int *pMem)
+{
+ FPA11 *fpa11 = GET_FPA11();
+ union
+ {
+ float32 f;
+ unsigned int i[1];
+ } val;
+
+ switch (fpa11->fType[Fn])
+ {
+ case typeDouble:
+ val.f = float64_to_float32(fpa11->fpreg[Fn].fDouble);
+ break;
+
+ case typeExtended:
+ val.f = floatx80_to_float32(fpa11->fpreg[Fn].fExtended);
+ break;
+
+ default: val.f = fpa11->fpreg[Fn].fSingle;
+ }
+
+ put_user(val.i[0], pMem);
+}
+
+static inline
+void storeDouble(const unsigned int Fn,unsigned int *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;
+
+ case typeExtended:
+ val.f = floatx80_to_float64(fpa11->fpreg[Fn].fExtended);
+ break;
+
+ default: val.f = fpa11->fpreg[Fn].fDouble;
+ }
+
+ put_user(val.i[1], &pMem[0]); /* msw */
+ put_user(val.i[0], &pMem[1]); /* lsw */
+}
+
+static inline
+void storeExtended(const unsigned int Fn,unsigned int *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 */
+ put_user(val.i[1], &pMem[2]);
+ put_user(val.i[2], &pMem[1]); /* msw */
+}
+
+static inline
+void storeMultiple(const unsigned int Fn,unsigned int *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;
+
+ 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;
+ }
+}
+
+unsigned int PerformLDF(const unsigned int opcode)
+{
+ unsigned int *pBase, *pAddress, *pFinal, nRc = 1,
+ write_back = WRITE_BACK(opcode);
+
+ //printk("PerformLDF(0x%08x), Fd = 0x%08x\n",opcode,getFd(opcode));
+
+ pBase = (unsigned int*)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;
+ case TRANSFER_EXTENDED: loadExtended(getFd(opcode),pAddress); break;
+ default: nRc = 0;
+ }
+
+ if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal);
+ return nRc;
+}
+
+unsigned int PerformSTF(const unsigned int opcode)
+{
+ unsigned int *pBase, *pAddress, *pFinal, nRc = 1,
+ write_back = WRITE_BACK(opcode);
+
+ //printk("PerformSTF(0x%08x), Fd = 0x%08x\n",opcode,getFd(opcode));
+ SetRoundingMode(ROUND_TO_NEAREST);
+
+ pBase = (unsigned int*)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(getFd(opcode),pAddress); break;
+ case TRANSFER_DOUBLE : storeDouble(getFd(opcode),pAddress); break;
+ case TRANSFER_EXTENDED: storeExtended(getFd(opcode),pAddress); break;
+ default: nRc = 0;
+ }
+
+ if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal);
+ return nRc;
+}
+
+unsigned int PerformLFM(const unsigned int opcode)
+{
+ unsigned int i, Fd, *pBase, *pAddress, *pFinal,
+ write_back = WRITE_BACK(opcode);
+
+ pBase = (unsigned int*)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 int)pFinal);
+ return 1;
+}
+
+unsigned int PerformSFM(const unsigned int opcode)
+{
+ unsigned int i, Fd, *pBase, *pAddress, *pFinal,
+ write_back = WRITE_BACK(opcode);
+
+ pBase = (unsigned int*)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 int)pFinal);
+ return 1;
+}
+
+#if 1
+unsigned int EmulateCPDT(const unsigned int opcode)
+{
+ unsigned int nRc = 0;
+
+ //printk("EmulateCPDT(0x%08x)\n",opcode);
+
+ 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;
+}
+#endif
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