arch/arm26/nwfpe/fpmodule.inl

   1 /*
   2     NetWinder Floating Point Emulator
   3     (c) Rebel.COM, 1998,1999
   4
   5     Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
   6
   7     This program is free software; you can redistribute it and/or modify
   8     it under the terms of the GNU General Public License as published by
   9     the Free Software Foundation; either version 2 of the License, or
  10     (at your option) any later version.
  11
  12     This program is distributed in the hope that it will be useful,
  13     but WITHOUT ANY WARRANTY; without even the implied warranty of
  14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15     GNU General Public License for more details.
  16
  17     You should have received a copy of the GNU General Public License
  18     along with this program; if not, write to the Free Software
  19     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 extern __inline__
  23 unsigned int readRegister(const unsigned int nReg)
  24 {
  25   /* Note: The CPU thinks it has dealt with the current instruction.  As
  26            a result the program counter has been advanced to the next
  27            instruction, and points 4 bytes beyond the actual instruction
  28            that caused the invalid instruction trap to occur.  We adjust
  29            for this in this routine.  LDF/STF instructions with Rn = PC
  30            depend on the PC being correct, as they use PC+8 in their
  31            address calculations. */
  32   unsigned int *userRegisters = GET_USERREG();
  33   unsigned int val = userRegisters[nReg];
  34   if (REG_PC == nReg) val -= 4;
  35   return val;
  36 }
  37
  38 extern __inline__
  39 void writeRegister(const unsigned int nReg, const unsigned int val)
  40 {
  41   unsigned int *userRegisters = GET_USERREG();
  42   userRegisters[nReg] = val;
  43 }
  44
  45 extern __inline__
  46 unsigned int readCPSR(void)
  47 {
  48   return(readRegister(REG_CPSR));
  49 }
  50
  51 extern __inline__
  52 void writeCPSR(const unsigned int val)
  53 {
  54   writeRegister(REG_CPSR,val);
  55 }
  56
  57 extern __inline__
  58 unsigned int readConditionCodes(void)
  59 {
  60 #ifdef __FPEM_TEST__
  61    return(0);
  62 #else
  63    return(readCPSR() & CC_MASK);
  64 #endif
  65 }
  66
  67 extern __inline__
  68 void writeConditionCodes(const unsigned int val)
  69 {
  70   unsigned int *userRegisters = GET_USERREG();
  71   unsigned int rval;
  72   /*
  73    * Operate directly on userRegisters since
  74    * the CPSR may be the PC register itself.
  75    */
  76   rval = userRegisters[REG_CPSR] & ~CC_MASK;
  77   userRegisters[REG_CPSR] = rval | (val & CC_MASK);
  78 }
  79
  80 extern __inline__
  81 unsigned int readMemoryInt(unsigned int *pMem)
  82 {
  83   return *pMem;
  84 }