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Sourcecode: linux-2.6 version File versions

fpmodule.inl

/*
    NetWinder Floating Point Emulator
    (c) Rebel.COM, 1998,1999

    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.
*/

static inline unsigned long readRegister(const unsigned int nReg)
{
      /* Note: The CPU thinks it has dealt with the current instruction.
         As a result the program counter has been advanced to the next
         instruction, and points 4 bytes beyond the actual instruction
         that caused the invalid instruction trap to occur.  We adjust
         for this in this routine.  LDF/STF instructions with Rn = PC
         depend on the PC being correct, as they use PC+8 in their
         address calculations. */
      struct pt_regs *regs = GET_USERREG();
      unsigned int val = regs->uregs[nReg];
      if (REG_PC == nReg)
            val -= 4;
      return val;
}

static inline void
writeRegister(const unsigned int nReg, const unsigned long val)
{
      struct pt_regs *regs = GET_USERREG();
      regs->uregs[nReg] = val;
}

static inline unsigned long readCPSR(void)
{
      return (readRegister(REG_CPSR));
}

static inline void writeCPSR(const unsigned long val)
{
      writeRegister(REG_CPSR, val);
}

static inline unsigned long readConditionCodes(void)
{
#ifdef __FPEM_TEST__
      return (0);
#else
      return (readCPSR() & CC_MASK);
#endif
}

static inline void writeConditionCodes(const unsigned long val)
{
      struct pt_regs *regs = GET_USERREG();
      unsigned long rval;
      /*
       * Operate directly on userRegisters since
       * the CPSR may be the PC register itself.
       */
      rval = regs->ARM_cpsr & ~CC_MASK;
      regs->ARM_cpsr = rval | (val & CC_MASK);
}

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