Source code of MARS Assembler

First commit of the 4.5 version (latest version available)
2014-12-21 12:49:28 +01:00
parent 343642d6ad
commit 0da1c5dcca
1333 changed files with 207089 additions and 3 deletions
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+package mars.mips.instructions;
+
+/*
+Copyright (c) 2003-2006,  Pete Sanderson and Kenneth Vollmar
+
+Developed by Pete Sanderson (psanderson@otterbein.edu)
+and Kenneth Vollmar (kenvollmar@missouristate.edu)
+
+Permission is hereby granted, free of charge, to any person obtaining 
+a copy of this software and associated documentation files (the 
+"Software"), to deal in the Software without restriction, including 
+without limitation the rights to use, copy, modify, merge, publish, 
+distribute, sublicense, and/or sell copies of the Software, and to 
+permit persons to whom the Software is furnished to do so, subject 
+to the following conditions:
+
+The above copyright notice and this permission notice shall be 
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR 
+ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF 
+CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+(MIT license, http://www.opensource.org/licenses/mit-license.html)
+ */
+
+/**
+ * These are the MIPS-defined formats of basic machine instructions.  The R-format indicates
+ * the instruction works only with registers.  The I-format indicates the instruction
+ * works with an immediate value (e.g. constant).  The J-format indicates this is a Jump
+ * instruction.  The I-branch-format is defined by me, not MIPS, to to indicate this is
+ * a Branch instruction, specifically to distinguish immediate
+ * values used as target addresses.
+ * 
+ * @author Pete Sanderson 
+ * @version August 2003
+ */
+public class BasicInstructionFormat {
+    public static final BasicInstructionFormat R_FORMAT = new BasicInstructionFormat();
+    public static final BasicInstructionFormat I_FORMAT = new BasicInstructionFormat();
+    public static final BasicInstructionFormat I_BRANCH_FORMAT = new BasicInstructionFormat();
+    public static final BasicInstructionFormat J_FORMAT = new BasicInstructionFormat();
+    
+    // private default constructor prevents objects of this class other than those above.
+    private BasicInstructionFormat() {
+    }
+}