cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

fpmodule.inl (2234B)

      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
     22static 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
     38static inline void
     39writeRegister(const unsigned int nReg, const unsigned long val)
     40{
     41	struct pt_regs *regs = GET_USERREG();
     42	regs->uregs[nReg] = val;
     43}
     44
     45static inline unsigned long readCPSR(void)
     46{
     47	return (readRegister(REG_CPSR));
     48}
     49
     50static inline void writeCPSR(const unsigned long val)
     51{
     52	writeRegister(REG_CPSR, val);
     53}
     54
     55static inline unsigned long readConditionCodes(void)
     56{
     57#ifdef __FPEM_TEST__
     58	return (0);
     59#else
     60	return (readCPSR() & CC_MASK);
     61#endif
     62}
     63
     64static 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}