patch-2.2.18 linux/arch/arm/nwfpe/fpmodule.inl

• Lines: 89
• Date: Fri Sep 15 23:28:37 2000
• Orig file: v2.2.17/arch/arm/nwfpe/fpmodule.inl
• Orig date: Thu Jan 1 01:00:00 1970

diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/arch/arm/nwfpe/fpmodule.inl linux/arch/arm/nwfpe/fpmodule.inl
@@ -0,0 +1,88 @@
+/*
+   NetWinder Floating Point Emulator
+   (c) Corel Computer Corporation, 1998
+
+   Direct questions, comments to Scott Bambrough <scottb@corelcomputer.com>
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/* Address of user registers on the kernel stack. */
+extern unsigned int *userRegisters;
+
+extern __inline__
+unsigned int readRegister(const unsigned int nReg)
+{
+	/* Note: The CPU thinks it has dealt with the current instruction.  As
+	   a result the program counter has been advanced to the next
+	   instruction, and points 4 bytes beyond the actual instruction
+	   that caused the invalid instruction trap to occur.  We adjust
+	   for this in this routine.  LDF/STF instructions with Rn = PC
+	   depend on the PC being correct, as they use PC+8 in their 
+	   address calculations. */
+	unsigned int val = userRegisters[nReg];
+
+	if (REG_PC == nReg)
+		val -= 4;
+
+	return val;
+}
+
+extern __inline__
+void writeRegister(const unsigned int nReg, const unsigned int val)
+{
+	userRegisters[nReg] = val;
+}
+
+extern __inline__
+unsigned int readCPSR(void)
+{
+	return (readRegister(REG_CPSR));
+}
+
+extern __inline__
+void writeCPSR(const unsigned int val)
+{
+	writeRegister(REG_CPSR, val);
+}
+
+extern __inline__
+unsigned int readConditionCodes(void)
+{
+#ifdef __FPEM_TEST__
+	return (0);
+#else
+	return (readCPSR() & CC_MASK);
+#endif
+}
+
+extern __inline__
+void writeConditionCodes(const unsigned int val)
+{
+	unsigned int rval;
+
+	/*
+	 * Operate directly on userRegisters since
+	 * the CPSR may be the PC register itself.
+	 */
+	rval = userRegisters[REG_CPSR] & ~CC_MASK;
+	userRegisters[REG_CPSR] = rval | (val & CC_MASK);
+}
+
+extern __inline__
+unsigned int readMemoryInt(unsigned int *pMem)
+{
+	return *pMem;
+}