fpmodule.inl
上传用户:lgb322
上传日期:2013-02-24
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文件大小:2k
- /*
- 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.
- */
- extern __inline__
- unsigned int 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. */
- unsigned int *userRegisters = GET_USERREG();
- unsigned int val = userRegisters[nReg];
- if (REG_PC == nReg) val -= 4;
- return val;
- }
- extern __inline__
- void writeRegister(const unsigned int nReg, const unsigned int val)
- {
- unsigned int *userRegisters = GET_USERREG();
- userRegisters[nReg] = val;
- }
- extern __inline__
- unsigned int readCPSR(void)
- {
- return(readRegister(REG_CPSR));
- }
- extern __inline__
- void writeCPSR(const unsigned int val)
- {
- writeRegister(REG_CPSR,val);
- }
- extern __inline__
- unsigned int readConditionCodes(void)
- {
- #ifdef __FPEM_TEST__
- return(0);
- #else
- return(readCPSR() & CC_MASK);
- #endif
- }
- extern __inline__
- void writeConditionCodes(const unsigned int val)
- {
- unsigned int *userRegisters = GET_USERREG();
- unsigned int rval;
- /*
- * Operate directly on userRegisters since
- * the CPSR may be the PC register itself.
- */
- rval = userRegisters[REG_CPSR] & ~CC_MASK;
- userRegisters[REG_CPSR] = rval | (val & CC_MASK);
- }
- extern __inline__
- unsigned int readMemoryInt(unsigned int *pMem)
- {
- return *pMem;
- }