Reworked unit tests for machine and renamed test_programs directory

test/riscv_instructions/simple_arithmetics/Makefile

@@ -0,0 +1,6 @@
+TOPDIR = ../..
+include $(TOPDIR)/Makefile.tests
+
+dumps: unsigned_addition.dump unsigned_division.dump unsigned_multiplication.dump unsigned_substraction.dump
+
+tests: unsigned_addition.guac unsigned_division.guac unsigned_multiplication.guac unsigned_substraction.guac

test/riscv_instructions/simple_arithmetics/README.md

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+# Simple arithmetics program
+
+These allow to check whether the following instructions are correctly implemented.
+
+- addi
+- sd
+- sw
+- li
+- sw
+- lw
+- mv
+- addw
+- nop
+- ld
+- ret

test/riscv_instructions/simple_arithmetics/unsigned_addition.c

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+#include "userlib/syscall.h"
+#include "userlib/libnachos.h"
+
+// EXPECTS TWO VARIABLES WITH A VALUE OF UNSIGNED 1
+int main() {
+    unsigned int x = 0;
+    unsigned int y = 1;
+    x = x + y;
+}

test/riscv_instructions/simple_arithmetics/unsigned_division.c

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+// Expecting two variables with a value of two
+int main() {
+    unsigned int x = 4;
+    unsigned int y = 2;
+    x = x / y;
+}

test/riscv_instructions/simple_arithmetics/unsigned_multiplication.c

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+// EXPECTS TWO VARIABLES WITH A VALUE OF UNSIGNED 2
+int main() {
+    unsigned int x = 1;
+    unsigned int y = 2;
+    x = x * y;
+}

test/riscv_instructions/simple_arithmetics/unsigned_substraction.c

@@ -0,0 +1,6 @@
+// EXPECTS TWO VARIABLES WITH A VALUE OF UNSIGNED 1
+int main() {
+    unsigned int x = 1;
+    unsigned int y = 1;
+    x = x - y;
+}