/*
      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);
  }