stack: add comments

core/stack.c

@@ -12,6 +12,9 @@ void printStackTrace(unsigned int maxFrames)
 	//	first function argument (maxFrames)
 	//	return address from caller
 	//	EBP (Extended Base Pointer) of calling function
+	//
+	// retrace function from address could done by optaining function address with gdb or
+	// objdump -S kernel
 	unsigned int *ebp = __builtin_frame_address(0);
 	for (unsigned int frame = 0; frame < maxFrames; frame++) {
 		unsigned int eip = ebp[1];