patch-2.2.18 linux/arch/arm/nwfpe/fpa11_cpdt.c

• Lines: 331
• Date: Fri Sep 15 23:28:37 2000
• Orig file: v2.2.17/arch/arm/nwfpe/fpa11_cpdt.c
• Orig date: Thu Jan 1 01:00:00 1970

diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/arch/arm/nwfpe/fpa11_cpdt.c linux/arch/arm/nwfpe/fpa11_cpdt.c
@@ -0,0 +1,330 @@
+/*
+    NetWinder Floating Point Emulator
+    (c) Corel Computer Corporation, 1998
+    (c) Philip Blundell, 1998
+
+    Direct questions, comments to Scott Bambrough <scottb@corelcomputer.com>
+
+    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 "config.h"
+#include "softfloat.h"
+#include "fpopcode.h"
+#include "fpa11.h"
+#include "fpmodule.h"
+#include "fpmodule.inl"
+
+#include <asm/uaccess.h>
+
+extern __inline__
+void loadSingle(const unsigned int Fn,const unsigned int *pMem)
+{
+   fpa11->fpreg[Fn].fType = typeSingle;
+   get_user(fpa11->fpreg[Fn].fValue.fSingle, pMem);
+}
+
+extern __inline__
+void loadDouble(const unsigned int Fn,const unsigned int *pMem)
+{
+   unsigned int *p;
+   p = (unsigned int*)&fpa11->fpreg[Fn].fValue.fDouble;
+   fpa11->fpreg[Fn].fType = typeDouble;
+   get_user(p[0], &pMem[1]);
+   get_user(p[1], &pMem[0]); /* sign & exponent */
+}   
+
+extern __inline__
+void loadExtended(const unsigned int Fn,const unsigned int *pMem)
+{
+   unsigned int *p;
+   p = (unsigned int*)&fpa11->fpreg[Fn].fValue.fExtended;
+   fpa11->fpreg[Fn].fType = 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 */
+}   
+
+extern __inline__
+void loadMultiple(const unsigned int Fn,const unsigned int *pMem)
+{
+   register unsigned int *p;
+   unsigned long x;
+
+   p = (unsigned int*)&(fpa11->fpreg[Fn].fValue);
+   get_user(x, &pMem[0]);
+   fpa11->fpreg[Fn].fType = (x >> 14) & 0x00000003;
+   
+   switch (fpa11->fpreg[Fn].fType)
+   {
+      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;
+   }
+}
+
+extern __inline__
+void storeSingle(const unsigned int Fn,unsigned int *pMem)
+{
+   float32 val;
+   register unsigned int *p = (unsigned int*)&val;
+   
+   switch (fpa11->fpreg[Fn].fType)
+   {
+      case typeDouble: 
+         val = float64_to_float32(fpa11->fpreg[Fn].fValue.fDouble);
+      break;
+
+      case typeExtended: 
+         val = floatx80_to_float32(fpa11->fpreg[Fn].fValue.fExtended);
+      break;
+
+      default: val = fpa11->fpreg[Fn].fValue.fSingle;
+   }
+  
+   put_user(p[0], pMem);
+}   
+
+extern __inline__
+void storeDouble(const unsigned int Fn,unsigned int *pMem)
+{
+   float64 val;
+   register unsigned int *p = (unsigned int*)&val;
+
+   switch (fpa11->fpreg[Fn].fType)
+   {
+      case typeSingle: 
+         val = float32_to_float64(fpa11->fpreg[Fn].fValue.fSingle);
+      break;
+
+      case typeExtended:
+         val = floatx80_to_float64(fpa11->fpreg[Fn].fValue.fExtended);
+      break;
+
+      default: val = fpa11->fpreg[Fn].fValue.fDouble;
+   }
+   put_user(p[1], &pMem[0]);	/* msw */
+   put_user(p[0], &pMem[1]);	/* lsw */
+}   
+
+extern __inline__
+void storeExtended(const unsigned int Fn,unsigned int *pMem)
+{
+   floatx80 val;
+   register unsigned int *p = (unsigned int*)&val;
+   
+   switch (fpa11->fpreg[Fn].fType)
+   {
+      case typeSingle: 
+         val = float32_to_floatx80(fpa11->fpreg[Fn].fValue.fSingle);
+      break;
+
+      case typeDouble: 
+         val = float64_to_floatx80(fpa11->fpreg[Fn].fValue.fDouble);
+      break;
+
+      default: val = fpa11->fpreg[Fn].fValue.fExtended;
+   }
+   
+   put_user(p[0], &pMem[0]); /* sign & exp */
+   put_user(p[1], &pMem[2]);
+   put_user(p[2], &pMem[1]); /* msw */
+}   
+
+extern __inline__
+void storeMultiple(const unsigned int Fn,unsigned int *pMem)
+{
+   register unsigned int nType, *p;
+   
+   p = (unsigned int*)&(fpa11->fpreg[Fn].fValue);
+   nType = fpa11->fpreg[Fn].fType;
+   
+   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;
+   
+   //fp_printk("PerformLDF(0x%08x), Fd = 0x%08x\n",opcode,getFd(opcode));
+
+   pBase = (unsigned int*)readRegister(getRn(opcode));
+   if (REG_PC == getRn(opcode)) pBase += 2;
+
+   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(opcode)) writeRegister(getRn(opcode),(unsigned int)pFinal);
+   return nRc;
+}
+
+unsigned int PerformSTF(const unsigned int opcode)
+{
+   unsigned int *pBase, *pAddress, *pFinal, nRc = 1;
+   
+   //fp_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;
+
+   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(opcode)) writeRegister(getRn(opcode),(unsigned int)pFinal);
+   return nRc;
+}
+
+unsigned int PerformLFM(const unsigned int opcode)
+{
+   unsigned int i, Fd, *pBase, *pAddress, *pFinal;
+   pBase = (unsigned int*)readRegister(getRn(opcode));
+   if (REG_PC == getRn(opcode)) pBase += 2;
+
+   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(opcode)) writeRegister(getRn(opcode),(unsigned int)pFinal);
+   return 1;
+}
+
+unsigned int PerformSFM(const unsigned int opcode)
+{
+   unsigned int i, Fd, *pBase, *pAddress, *pFinal;
+   
+   pBase = (unsigned int*)readRegister(getRn(opcode));
+   if (REG_PC == getRn(opcode)) pBase += 2;
+   
+   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(opcode)) writeRegister(getRn(opcode),(unsigned int)pFinal);
+   return 1;
+}
+
+#if 1
+unsigned int EmulateCPDT(const unsigned int opcode)
+{
+  unsigned int nRc = 0;
+
+  //fp_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