Assembly and Linking Example

  This section describes the assembly and linking of a moderately
complex program.  (The project is a multi-channel high voltage
control system for the stabilization of nuclear radiation detection
equipment.)  The files may be found in the '/project/phs_4' directory.

  The project includes an 'optional' module that can be downloaded
by the main project.  The 'optional' module is assembled from an
independent file but must be linked with the main project files
to resolve references external to the 'optional' module.

    ... Assembly
    ... Linking

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... Assembly

  the project files included twelve .asm modules and
four .def include files:

        phs.asm                 system.def
        acia.asm                area.def
        acq.asm                 define.def
        hvctrl.asm              data.def
        termio.asm
        select.asm
        status.asm
        histos.asm
        help.asm
        aiconv.asm
        phsmon.asm
        phsopt.asm

  Each of the modules was assembled individually.  This was done
by creating a command file containing the assembly command lines:

        as6809 -gloaxsff phs
        as6809 -gloaxsff acia
        as6809 -gloaxsff acq
        as6809 -gloaxsff hvctrl
        as6809 -gloaxsff termio
        as6809 -gloaxsff select
        as6809 -gloaxsff status
        as6809 -gloaxsff histos
        as6809 -gloaxsff help
        as6809 -gloaxsff aiconv
        as6809 -gloaxsff phsmon
        as6809 -gloaxsff phsopt

the assembly process produced an object (.rel) file (-o), a listing
(.lst) file (-l), and a symbol (.sym) file (-s) for each individual
.asm file.  the assembly process made all undefined labels
global (-g), all internal labels global (-a), the output in HEX
format (-x), and the listing files to have relocations flagged (-ff).

=> Section Index

... Linking

  The main program was linked using a file (PHS.LNK) containing the
following command lines:

        -mxsu                          ; linker options
        phs                            ; First input file
        acia                           ; .
        acq                            ; .
        hvctrl                         ; .
        termio                         ; .
        select                         ; .
        status                         ; .
        histos                         ; .
        help                           ; .
        aiconv                         ; .
        phsmon                         ; input file
        -b WORKPG = 0x0F00             ; value definition
        -b BUFSAV = bufsav             ; .
        -b PGMSAV = pgmsav             ; .
        -b IRQVEC = irqvec             ; value definition
        -e                             ; end of file

and was invoked by the command line:

        aslink -f phs

The linking process produced a map (.map) file (-m) in HEX format (-x)
and a Motorola (.s19) loader file (-s).  The -b options specify the
memory addresses for certain program sections as defined in the
assembled modules.  The file input was terminated by the -e option.

  The 'optional' loadable program was linked using a file (OPT.LNK)
containing the following command lines:

        -wmxus+ opt                    ; output file name
        -v                             ; suppress linker output
        phs                            ; input file
        acia                           ; .
        acq                            ; .
        hvctrl                         ; .
        termio                         ; .
        select                         ; .
        status                         ; .
        histos                         ; .
        help                           ; .
        aiconv                         ; .
        phsmon                         ; input file
        -o                             ; enable linker output
        phsopt                         ; input file
        -b WORKPG = 0x0F00             ; value definition
        -b BUFSAV = bufsav             ; .
        -b PGMSAV = pgmsav             ; .
        -b IRQVEC = irqvec             ; value definition
        -e                             ; end of file

and was invoked by the command line:

        aslink -f opt

The linking process creates an overlay output file from the
PHSOPT code using all the global symbols defined in the PHS
files.  The order of the main project files MUST be identical
to that in the main project .lnk file.

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Last Updated: September 2023