Added an editor program. It doesn't edit anything yet :/

src/editor.c

@@ -0,0 +1,13 @@
+#include <stdio.h>
+
+__attribute__ ((section("entry")))
+int main(int argc, char** argv) {
+    if (argc < 2) {
+        printf("Usage: %s <file>\n", argv[0]);
+        return 1;
+    }
+
+    printf("%s\n", argv[1]);
+
+    return 0;
+}

src/editor.ld

@@ -0,0 +1,16 @@
+SECTIONS {
+    .text 0x400000 : {
+        *(entry);
+        *(.text*);
+    }
+    .data : {
+        *(.data*);
+    }
+    .rodata : {
+        *(.rodata*);
+    }
+    .bss : {
+        *(.bss*);
+    }
+}
+

src/filetable.asm

@@ -19,6 +19,7 @@ filetable:
     db "testfont",0,0,     "fnt",0,60,4
     db "test",0,0,0,0,0,0, "txt",0,64,1
     db "calc",0,0,0,0,0,0, "bin",0,65,6
+    db "editor",0,0,0,0,   "bin",0,71,10
 
 times 512-($-$$) db 0