print exit code when using debug machine, add matmult

test/syscall_tests/Makefile

@@ -1,4 +1,4 @@
-PROGRAMS = halt.guac prints.guac producteur_consommateur.guac join.guac
+PROGRAMS = halt.guac prints.guac producteur_consommateur.guac join.guac matmult.guac
 TOPDIR = ../..
 include $(TOPDIR)/Makefile.rules
 

test/syscall_tests/matmult.c

@@ -0,0 +1,60 @@
+/* matmult.c 
+ *    Test program to do matrix multiplication on large arrays.
+ *
+ *    Intended to stress virtual memory system.
+ *
+ *    Ideally, we could read the matrices off of the file system,
+ *	and store the result back to the file system!
+ *
+ * -----------------------------------------------------
+ * This file is part of the Nachos-RiscV distribution
+ * Copyright (c) 2022 University of Rennes 1.
+ * 
+ * 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, version 3.
+ *
+ * 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 
+ * (see see <http://www.gnu.org/licenses/>).
+ * -----------------------------------------------------
+
+ */
+
+#include "userlib/syscall.h"
+
+#define Dim 	10	/* sum total of the arrays doesn't fit in 
+			 * physical memory 
+			 */
+
+/* The matrices to be filled-in and multiplied */
+int A[Dim][Dim];
+int B[Dim][Dim];
+int C[Dim][Dim];
+
+int
+main()
+{
+    int i, j, k;
+
+    Write("Start matmult\n",14,CONSOLE_OUTPUT);
+    
+    for (i = 0; i < Dim; i++)		/* first initialize the matrices */
+	for (j = 0; j < Dim; j++) {
+	     A[i][j] = i;
+	     B[i][j] = j;
+	     C[i][j] = 0;
+	}
+
+    for (i = 0; i < Dim; i++)		/* then multiply them together */
+	for (j = 0; j < Dim; j++)
+            for (k = 0; k < Dim; k++)
+		 C[i][j] += A[i][k] * B[k][j];
+
+  
+    Exit(C[Dim-1][Dim-1]);		/* and then we're done */
+
+    return 0;
+}