feat: add exercise 3-1 & 3-2

.gitignore

@@ -1,4 +1,4 @@
 *.o
 *.bin
 *.elf
-
+*.o.*

code/exercises/ex_3_1/Makefile

@@ -0,0 +1,9 @@
+all:
+	gcc -c hello.c -o hello.o
+	readelf -h hello.o > hello.o.header
+	readelf -SW hello.o > hello.o.section
+	gcc -c hello.c -o hello.o -g
+	objdump -S hello.o > hello.o.disassembly
+
+clean:
+	rm -rf *.o *.header *.section *.disassembly

code/exercises/ex_3_1/hello.c

@@ -0,0 +1,7 @@
+#include "stdio.h"
+
+int main()
+{
+    printf("Hello World!\n");
+    return 0;
+}

code/exercises/ex_3_2/Makefile

@@ -0,0 +1,6 @@
+all:
+	gcc -c code.c -o code.o
+	objdump -t code.o > code.o.symbol
+
+clean:
+	rm -rf *.o *.symbol

code/exercises/ex_3_2/code.c

@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+int global_init = 0x11111111;
+const int global_const = 0x22222222;
+
+void main()
+{ 
+  static int static_var = 0x33333333;
+  static int static_var_uninit;
+
+  int auto_var = 0x44444444;
+
+  printf("hello world!\n");
+  return;
+}