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/*
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.
*/
/* Address of user registers on the kernel stack. */
extern unsigned int *userRegisters;
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 val = userRegisters[nReg];
if (REG_PC == nReg) val -= 4;
return val;
}
extern __inline__
void writeRegister(const unsigned int nReg, const unsigned int val)
{
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 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;
}
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