Hello World

lib/asm/data_object.rb

@@ -3,7 +3,13 @@ module Asm
     def initialize(data)
       @data = data
     end
-
+    
+    def at address
+      @address = address
+    end
+    def length
+      @data.length
+    end
     def assemble(io, as)
       io << @data
     end

test/label_test.rb

@@ -10,23 +10,32 @@ class TestExtern < MiniTest::Test
 
   def test_extern
     @generator.instance_eval {
-      push lr
-      ldr r0, "hello world".to_sym
-      mov r7, 4 #4 is write
-    	swi 0                   
-    	pop pc
+      mov r7, 4 #4 == write
+      mov r0 , 1     #stdout
+      add r1 , pc , 12   # address of "hello Raisa"
+      mov r2 , 12 # length of hello
+    	swi 0
       mov r7, 1   #1 == exit
     	swi 0
     }
-
-    write(7 , 'label')    
+    @generator.add_data("Hello Raisa"+ "\n\x00")
+    write(7 , 'label') 
   end
   #helper to write the file
   def write len ,name
     writer = Asm::ObjectWriter.new(Elf::Constants::TARGET_ARM)
     assembly = @generator.assemble_to_string
-    assert_equal len * 4 , assembly.length 
+    #assert_equal len * 4 , assembly.length 
     writer.set_text assembly
     writer.save("#{name}_test.o")    
   end
 end
+# _start copied from dietc
+#  	mov	fp, #0			@ clear the frame pointer
+#  	ldr	a1, [sp]		@ argc
+#  	add	a2, sp, #4		@ argv
+#  	ldr	ip, .L3
+#  	add	a3, a2, a1, lsl #2	@ &argv[argc]
+#  	add	a3, a3, #4		@ envp	
+#  	str	a3, [ip, #0]		@ environ = envp
+#  	bl	main