INCBIN filename

where:

You can use INCBIN to include executable files, literals, or any arbitrary data. The contents of the file are added to the current ELF section, byte for byte, without being interpreted in any way. Assembly continues at the line following the INCBIN directive.

By default, the assembler searches the current place for included files. The current place is the directory where the calling file is located. Use the -i assembler command-line option to add directories to the search path. File names and directory names containing spaces must not be enclosed in double quotes ( " " ).

        AREA    Example, CODE, READONLY
        INCBIN  file1.dat               ; includes file1 if it
                                        ; exists in the 
                                        ; current place.
        INCBIN  c:\project\file2.txt    ; includes file2