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Exceptions
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mars.simulator</FONT>
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Class Exceptions</H2>
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<PRE>
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<A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
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<IMG SRC="../../resources/inherit.gif" ALT="extended by "><B>mars.simulator.Exceptions</B>
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</PRE>
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<DL>
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<DT><PRE>public class <B>Exceptions</B><DT>extends <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></DL>
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</PRE>
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<P>
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Represents an error/interrupt that occurs during execution (simulation).
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<P>
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<P>
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<DL>
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<DT><B>Author:</B></DT>
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<DD>Pete Sanderson</DD>
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</DL>
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<HR>
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<P>
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<!-- =========== FIELD SUMMARY =========== -->
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<A NAME="field_summary"><!-- --></A>
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<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
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<B>Field Summary</B></FONT></TH>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static int</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../mars/simulator/Exceptions.html#ADDRESS_EXCEPTION_LOAD">ADDRESS_EXCEPTION_LOAD</A></B></CODE>
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<BR>
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</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static int</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../mars/simulator/Exceptions.html#ADDRESS_EXCEPTION_STORE">ADDRESS_EXCEPTION_STORE</A></B></CODE>
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<BR>
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</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static int</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../mars/simulator/Exceptions.html#ARITHMETIC_OVERFLOW_EXCEPTION">ARITHMETIC_OVERFLOW_EXCEPTION</A></B></CODE>
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<BR>
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</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static int</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../mars/simulator/Exceptions.html#BREAKPOINT_EXCEPTION">BREAKPOINT_EXCEPTION</A></B></CODE>
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<BR>
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</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static int</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../mars/simulator/Exceptions.html#DIVIDE_BY_ZERO_EXCEPTION">DIVIDE_BY_ZERO_EXCEPTION</A></B></CODE>
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<BR>
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</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static int</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../mars/simulator/Exceptions.html#EXTERNAL_INTERRUPT_DISPLAY">EXTERNAL_INTERRUPT_DISPLAY</A></B></CODE>
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<BR>
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</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static int</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../mars/simulator/Exceptions.html#EXTERNAL_INTERRUPT_KEYBOARD">EXTERNAL_INTERRUPT_KEYBOARD</A></B></CODE>
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<BR>
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The exception number is stored in coprocessor 0 cause register ($13)
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Note: the codes for External Interrupts have been modified from MIPS
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specs in order to encode two pieces of information.</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static int</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../mars/simulator/Exceptions.html#FLOATING_POINT_OVERFLOW">FLOATING_POINT_OVERFLOW</A></B></CODE>
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<BR>
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</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static int</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../mars/simulator/Exceptions.html#FLOATING_POINT_UNDERFLOW">FLOATING_POINT_UNDERFLOW</A></B></CODE>
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<BR>
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</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static int</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../mars/simulator/Exceptions.html#RESERVED_INSTRUCTION_EXCEPTION">RESERVED_INSTRUCTION_EXCEPTION</A></B></CODE>
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<BR>
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</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static int</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../mars/simulator/Exceptions.html#SYSCALL_EXCEPTION">SYSCALL_EXCEPTION</A></B></CODE>
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<BR>
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</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static int</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../mars/simulator/Exceptions.html#TRAP_EXCEPTION">TRAP_EXCEPTION</A></B></CODE>
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<BR>
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</TD>
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</TR>
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</TABLE>
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<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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<A NAME="constructor_summary"><!-- --></A>
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<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
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<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
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<B>Constructor Summary</B></FONT></TH>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD><CODE><B><A HREF="../../mars/simulator/Exceptions.html#Exceptions()">Exceptions</A></B>()</CODE>
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<BR>
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</TD>
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</TR>
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</TABLE>
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<!-- ========== METHOD SUMMARY =========== -->
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<A NAME="method_summary"><!-- --></A>
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<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
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<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
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<B>Method Summary</B></FONT></TH>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static void</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../mars/simulator/Exceptions.html#setRegisters(int)">setRegisters</A></B>(int cause)</CODE>
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<BR>
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Given MIPS exception cause code, will place that code into
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coprocessor 0 CAUSE register ($13), set the EPC register to
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"current" program counter, and set Exception Level bit in STATUS register.</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static void</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../mars/simulator/Exceptions.html#setRegisters(int, int)">setRegisters</A></B>(int cause,
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int addr)</CODE>
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<BR>
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Given MIPS exception cause code and bad address, place the bad address into VADDR
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register ($8) then call overloaded setRegisters with the cause code to do the rest.</TD>
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</TR>
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</TABLE>
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<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
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<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
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<TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></B></TH>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD><CODE><A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
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</TR>
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</TABLE>
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<P>
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<!-- ============ FIELD DETAIL =========== -->
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<A NAME="field_detail"><!-- --></A>
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<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
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<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
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<B>Field Detail</B></FONT></TH>
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</TR>
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</TABLE>
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<A NAME="EXTERNAL_INTERRUPT_KEYBOARD"><!-- --></A><H3>
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EXTERNAL_INTERRUPT_KEYBOARD</H3>
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<PRE>
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public static final int <B>EXTERNAL_INTERRUPT_KEYBOARD</B></PRE>
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<DL>
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<DD>The exception number is stored in coprocessor 0 cause register ($13)
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Note: the codes for External Interrupts have been modified from MIPS
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specs in order to encode two pieces of information. According
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to spec, there is one External Interrupt code, 0. But then
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how to distinguish keyboard interrupt from display interrupt?
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The Cause register has Interupt Pending bits that can be set.
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Bit 8 represents keyboard, bit 9 represents display. Those
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bits are included into this code, but shifted right two positions
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since the interrupt code will be shifted left two positions
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for inserting cause code into bit positions 2-6 in Cause register.
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DPS 23 July 2008.
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<P>
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<DL>
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<DT><B>See Also:</B><DD><A HREF="../../constant-values.html#mars.simulator.Exceptions.EXTERNAL_INTERRUPT_KEYBOARD">Constant Field Values</A></DL>
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</DL>
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<HR>
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<A NAME="EXTERNAL_INTERRUPT_DISPLAY"><!-- --></A><H3>
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EXTERNAL_INTERRUPT_DISPLAY</H3>
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<PRE>
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public static final int <B>EXTERNAL_INTERRUPT_DISPLAY</B></PRE>
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<DL>
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<DL>
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<DT><B>See Also:</B><DD><A HREF="../../constant-values.html#mars.simulator.Exceptions.EXTERNAL_INTERRUPT_DISPLAY">Constant Field Values</A></DL>
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</DL>
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<HR>
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<A NAME="ADDRESS_EXCEPTION_LOAD"><!-- --></A><H3>
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ADDRESS_EXCEPTION_LOAD</H3>
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<PRE>
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public static final int <B>ADDRESS_EXCEPTION_LOAD</B></PRE>
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<DL>
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<DL>
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<DT><B>See Also:</B><DD><A HREF="../../constant-values.html#mars.simulator.Exceptions.ADDRESS_EXCEPTION_LOAD">Constant Field Values</A></DL>
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</DL>
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<HR>
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<A NAME="ADDRESS_EXCEPTION_STORE"><!-- --></A><H3>
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ADDRESS_EXCEPTION_STORE</H3>
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<PRE>
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public static final int <B>ADDRESS_EXCEPTION_STORE</B></PRE>
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<DL>
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<DL>
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<DT><B>See Also:</B><DD><A HREF="../../constant-values.html#mars.simulator.Exceptions.ADDRESS_EXCEPTION_STORE">Constant Field Values</A></DL>
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</DL>
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<HR>
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<A NAME="SYSCALL_EXCEPTION"><!-- --></A><H3>
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SYSCALL_EXCEPTION</H3>
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<PRE>
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public static final int <B>SYSCALL_EXCEPTION</B></PRE>
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<DL>
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<DL>
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<DT><B>See Also:</B><DD><A HREF="../../constant-values.html#mars.simulator.Exceptions.SYSCALL_EXCEPTION">Constant Field Values</A></DL>
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</DL>
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<HR>
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<A NAME="BREAKPOINT_EXCEPTION"><!-- --></A><H3>
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BREAKPOINT_EXCEPTION</H3>
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<PRE>
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public static final int <B>BREAKPOINT_EXCEPTION</B></PRE>
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<DL>
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<DL>
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<DT><B>See Also:</B><DD><A HREF="../../constant-values.html#mars.simulator.Exceptions.BREAKPOINT_EXCEPTION">Constant Field Values</A></DL>
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</DL>
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<HR>
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<A NAME="RESERVED_INSTRUCTION_EXCEPTION"><!-- --></A><H3>
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RESERVED_INSTRUCTION_EXCEPTION</H3>
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<PRE>
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public static final int <B>RESERVED_INSTRUCTION_EXCEPTION</B></PRE>
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<DL>
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<DL>
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<DT><B>See Also:</B><DD><A HREF="../../constant-values.html#mars.simulator.Exceptions.RESERVED_INSTRUCTION_EXCEPTION">Constant Field Values</A></DL>
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</DL>
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<HR>
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<A NAME="ARITHMETIC_OVERFLOW_EXCEPTION"><!-- --></A><H3>
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ARITHMETIC_OVERFLOW_EXCEPTION</H3>
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<PRE>
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public static final int <B>ARITHMETIC_OVERFLOW_EXCEPTION</B></PRE>
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<DL>
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<DL>
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<DT><B>See Also:</B><DD><A HREF="../../constant-values.html#mars.simulator.Exceptions.ARITHMETIC_OVERFLOW_EXCEPTION">Constant Field Values</A></DL>
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</DL>
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<HR>
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<A NAME="TRAP_EXCEPTION"><!-- --></A><H3>
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TRAP_EXCEPTION</H3>
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<PRE>
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public static final int <B>TRAP_EXCEPTION</B></PRE>
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<DL>
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<DL>
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<DT><B>See Also:</B><DD><A HREF="../../constant-values.html#mars.simulator.Exceptions.TRAP_EXCEPTION">Constant Field Values</A></DL>
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<A NAME="DIVIDE_BY_ZERO_EXCEPTION"><!-- --></A><H3>
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DIVIDE_BY_ZERO_EXCEPTION</H3>
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<PRE>
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public static final int <B>DIVIDE_BY_ZERO_EXCEPTION</B></PRE>
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<DL>
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<DL>
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<DT><B>See Also:</B><DD><A HREF="../../constant-values.html#mars.simulator.Exceptions.DIVIDE_BY_ZERO_EXCEPTION">Constant Field Values</A></DL>
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<A NAME="FLOATING_POINT_OVERFLOW"><!-- --></A><H3>
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FLOATING_POINT_OVERFLOW</H3>
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<PRE>
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public static final int <B>FLOATING_POINT_OVERFLOW</B></PRE>
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<DL>
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<DL>
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<DT><B>See Also:</B><DD><A HREF="../../constant-values.html#mars.simulator.Exceptions.FLOATING_POINT_OVERFLOW">Constant Field Values</A></DL>
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<A NAME="FLOATING_POINT_UNDERFLOW"><!-- --></A><H3>
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FLOATING_POINT_UNDERFLOW</H3>
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<PRE>
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public static final int <B>FLOATING_POINT_UNDERFLOW</B></PRE>
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<DL>
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<DL>
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<DT><B>See Also:</B><DD><A HREF="../../constant-values.html#mars.simulator.Exceptions.FLOATING_POINT_UNDERFLOW">Constant Field Values</A></DL>
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<A NAME="Exceptions()"><!-- --></A><H3>
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Exceptions</H3>
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<PRE>
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public <B>Exceptions</B>()</PRE>
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<DL>
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<A NAME="setRegisters(int)"><!-- --></A><H3>
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setRegisters</H3>
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<PRE>
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public static void <B>setRegisters</B>(int cause)</PRE>
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<DL>
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<DD>Given MIPS exception cause code, will place that code into
|
|
coprocessor 0 CAUSE register ($13), set the EPC register to
|
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"current" program counter, and set Exception Level bit in STATUS register.
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<P>
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<DD><DL>
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<DT><B>Parameters:</B><DD><CODE>cause</CODE> - The cause code (see Exceptions for a list)</DL>
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<A NAME="setRegisters(int, int)"><!-- --></A><H3>
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setRegisters</H3>
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<PRE>
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|
public static void <B>setRegisters</B>(int cause,
|
|
int addr)</PRE>
|
|
<DL>
|
|
<DD>Given MIPS exception cause code and bad address, place the bad address into VADDR
|
|
register ($8) then call overloaded setRegisters with the cause code to do the rest.
|
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<P>
|
|
<DD><DL>
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<DT><B>Parameters:</B><DD><CODE>cause</CODE> - The cause code (see Exceptions for a list). Should be address exception.<DD><CODE>addr</CODE> - The address that caused the exception.</DL>
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