1/*
2    NetWinder Floating Point Emulator
3    (c) Rebel.COM, 1998,1999
4
5    Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
6
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.
11
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.
16
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.
20*/
21
22extern __inline__
23unsigned int readRegister(const unsigned int nReg)
24{
25	/* Note: The CPU thinks it has dealt with the current instruction.
26	   As a result the program counter has been advanced to the next
27	   instruction, and points 4 bytes beyond the actual instruction
28	   that caused the invalid instruction trap to occur.  We adjust
29	   for this in this routine.  LDF/STF instructions with Rn = PC
30	   depend on the PC being correct, as they use PC+8 in their
31	   address calculations. */
32	unsigned int *userRegisters = GET_USERREG();
33	unsigned int val = userRegisters[nReg];
34	if (REG_PC == nReg)
35		val -= 4;
36	return val;
37}
38
39extern __inline__
40void writeRegister(const unsigned int nReg, const unsigned int val)
41{
42	unsigned int *userRegisters = GET_USERREG();
43	userRegisters[nReg] = val;
44}
45
46extern __inline__
47unsigned int readCPSR(void)
48{
49	return (readRegister(REG_CPSR));
50}
51
52extern __inline__
53void writeCPSR(const unsigned int val)
54{
55	writeRegister(REG_CPSR, val);
56}
57
58extern __inline__
59unsigned int readConditionCodes(void)
60{
61#ifdef __FPEM_TEST__
62	return (0);
63#else
64	return (readCPSR() & CC_MASK);
65#endif
66}
67
68extern __inline__
69void writeConditionCodes(const unsigned int val)
70{
71	unsigned int *userRegisters = GET_USERREG();
72	unsigned int rval;
73	/*
74	 * Operate directly on userRegisters since
75	 * the CPSR may be the PC register itself.
76	 */
77	rval = userRegisters[REG_CPSR] & ~CC_MASK;
78	userRegisters[REG_CPSR] = rval | (val & CC_MASK);
79}
80
81extern __inline__
82unsigned int readMemoryInt(unsigned int *pMem)
83{
84	return *pMem;
85}
86