Add fn/obj/sym macros to macros.inc

include/macros.inc

@@ -145,3 +145,54 @@
 .set THRM1, 1020
 .set THRM2, 1021
 .set THRM3, 1022
+
+# Defines a sized symbol with function type.
+# Usage:
+# .fn my_function, local
+# /* asm here */
+# .endfn my_function
+.macro .fn name, visibility=global
+.\visibility "\name"
+.type "\name", @function
+"\name":
+.endm
+
+.macro .endfn name
+.size "\name", . - "\name"
+.endm
+
+# Defines a sized symbol with object type.
+# Usage:
+# .obj my_object, local
+# /* data here */
+# .endobj my_object
+.macro .obj name, visibility=global
+.\visibility "\name"
+.type "\name", @object
+"\name":
+.endm
+
+.macro .endobj name
+.size "\name", . - "\name"
+.endm
+
+# Defines a sized symbol without a type.
+# Usage:
+# .sym my_sym, local
+# /* anything here */
+# .endsym my_sym
+.macro .sym name, visibility=global
+.\visibility "\name"
+"\name":
+.endm
+
+.macro .endsym name
+.size "\name", . - "\name"
+.endm
+
+# Generates a relative relocation against a symbol.
+# Usage:
+# .rel my_function, .L_label
+.macro .rel name, label
+.4byte "\name" + ("\label" - "\name")
+.endm