2 NetWinder Floating Point Emulator
3 (c) Rebel.COM, 1998,1999
5 Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
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.
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.
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.
22 static inline unsigned long readRegister(const unsigned int nReg)
24 /* Note: The CPU thinks it has dealt with the current instruction.
25 As a result the program counter has been advanced to the next
26 instruction, and points 4 bytes beyond the actual instruction
27 that caused the invalid instruction trap to occur. We adjust
28 for this in this routine. LDF/STF instructions with Rn = PC
29 depend on the PC being correct, as they use PC+8 in their
30 address calculations. */
31 unsigned long *userRegisters = GET_USERREG();
32 unsigned int val = userRegisters[nReg];
39 writeRegister(const unsigned int nReg, const unsigned long val)
41 unsigned long *userRegisters = GET_USERREG();
42 userRegisters[nReg] = val;
45 static inline unsigned long readCPSR(void)
47 return (readRegister(REG_CPSR));
50 static inline void writeCPSR(const unsigned long val)
52 writeRegister(REG_CPSR, val);
55 static inline unsigned long readConditionCodes(void)
60 return (readCPSR() & CC_MASK);
64 static inline void writeConditionCodes(const unsigned long val)
66 unsigned long *userRegisters = GET_USERREG();
69 * Operate directly on userRegisters since
70 * the CPSR may be the PC register itself.
72 rval = userRegisters[REG_CPSR] & ~CC_MASK;
73 userRegisters[REG_CPSR] = rval | (val & CC_MASK);