Linux Kernel  3.7.1
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fpmodule.inl
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1 /*
2  NetWinder Floating Point Emulator
3  (c) Rebel.COM, 1998,1999
4 
5  Direct questions, comments to Scott Bambrough <[email protected]>
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 
22 static inline unsigned long readRegister(const unsigned int nReg)
23 {
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  struct pt_regs *regs = GET_USERREG();
32  unsigned int val = regs->uregs[nReg];
33  if (REG_PC == nReg)
34  val -= 4;
35  return val;
36 }
37 
38 static inline void
39 writeRegister(const unsigned int nReg, const unsigned long val)
40 {
41  struct pt_regs *regs = GET_USERREG();
42  regs->uregs[nReg] = val;
43 }
44 
45 static inline unsigned long readCPSR(void)
46 {
47  return (readRegister(REG_CPSR));
48 }
49 
50 static inline void writeCPSR(const unsigned long val)
51 {
52  writeRegister(REG_CPSR, val);
53 }
54 
55 static inline unsigned long readConditionCodes(void)
56 {
57 #ifdef __FPEM_TEST__
58  return (0);
59 #else
60  return (readCPSR() & CC_MASK);
61 #endif
62 }
63 
64 static inline void writeConditionCodes(const unsigned long val)
65 {
66  struct pt_regs *regs = GET_USERREG();
67  unsigned long rval;
68  /*
69  * Operate directly on userRegisters since
70  * the CPSR may be the PC register itself.
71  */
72  rval = regs->ARM_cpsr & ~CC_MASK;
73  regs->ARM_cpsr = rval | (val & CC_MASK);
74 }