tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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. As
26 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) val -= 4;
35 return val;
36}
37
38extern __inline__
39void writeRegister(const unsigned int nReg, const unsigned int val)
40{
41 unsigned int *userRegisters = GET_USERREG();
42 userRegisters[nReg] = val;
43}
44
45extern __inline__
46unsigned int readCPSR(void)
47{
48 return(readRegister(REG_CPSR));
49}
50
51extern __inline__
52void writeCPSR(const unsigned int val)
53{
54 writeRegister(REG_CPSR,val);
55}
56
57extern __inline__
58unsigned int readConditionCodes(void)
59{
60#ifdef __FPEM_TEST__
61 return(0);
62#else
63 return(readCPSR() & CC_MASK);
64#endif
65}
66
67extern __inline__
68void writeConditionCodes(const unsigned int val)
69{
70 unsigned int *userRegisters = GET_USERREG();
71 unsigned int rval;
72 /*
73 * Operate directly on userRegisters since
74 * the CPSR may be the PC register itself.
75 */
76 rval = userRegisters[REG_CPSR] & ~CC_MASK;
77 userRegisters[REG_CPSR] = rval | (val & CC_MASK);
78}
79
80extern __inline__
81unsigned int readMemoryInt(unsigned int *pMem)
82{
83 return *pMem;
84}