[+] Gradle init

2022-11-09 22:59:02 -05:00
parent ced3ee8e47
commit 77d4aa66dc
626 changed files with 429 additions and 0 deletions
@@ -0,0 +1,87 @@
+   package mars.mips.instructions.syscalls;
+   import mars.util.*;
+   import mars.mips.hardware.*;
+   import mars.*;
+
+/*
+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)
+ */
+
+
+/** 
+ * Service to read console input string into buffer starting at address in $a0.  
+ */
+ 
+    public class SyscallReadString extends AbstractSyscall {
+   /**
+    * Build an instance of the Read String syscall.  Default service number
+    * is 8 and name is "ReadString".
+    */
+       public SyscallReadString() {
+         super(8, "ReadString");
+      }
+      
+   /**
+   * Performs syscall function to read console input string into buffer starting at address in $a0.
+   * Follows semantics of UNIX 'fgets'.  For specified length n,
+   * string can be no longer than n-1. If less than that, add
+   * newline to end.  In either case, then pad with null byte.
+   */
+       public void simulate(ProgramStatement statement) throws ProcessingException {
+      
+         String inputString = "";
+         int buf = RegisterFile.getValue(4); // buf addr in $a0
+         int maxLength = RegisterFile.getValue(5) - 1; // $a1
+			boolean addNullByte = true;
+      	// Guard against negative maxLength.  DPS 13-July-2011
+         if (maxLength < 0) 
+         {
+            maxLength = 0;
+				addNullByte = false;
+         }
+         inputString = SystemIO.readString(this.getNumber(), maxLength);
+         int stringLength = Math.min(maxLength, inputString.length());
+         try
+         {
+            for (int index = 0; index < stringLength; index++)
+            {
+               Globals.memory.setByte(buf + index,
+                                       inputString.charAt(index));
+            }            
+            if (stringLength < maxLength)
+            {
+               Globals.memory.setByte(buf + stringLength, '\n');
+               stringLength++;
+            }
+            if (addNullByte) Globals.memory.setByte(buf + stringLength, 0);
+         } 
+             catch (AddressErrorException e)
+            {
+               throw new ProcessingException(statement, e);
+            }
+      }
+   }