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>2.6. OS9 Modules</A
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>&#13;Since version 2.5, LWASM is able to generate OS9 modules. The syntax is
basically the same as for other assemblers.  A module starts with the MOD
directive and ends with the EMOD directive.  The OS9 directive is provided
as a shortcut for writing system calls.&#13;</P
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>&#13;LWASM does NOT provide an OS9Defs file. You must provide your own. Also note
that the common practice of using "ifp1" around the inclusion of the OS9Defs
file is discouraged as it is pointless and can lead to unintentional
problems and phasing errors.  Because LWASM reads each file exactly once,
there is no benefit to restricting the inclusion to the first assembly pass.&#13;</P
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>&#13;As of version 4.5, LWASM also implements the standard data/code address
streams for OS9 modules.  That means that between MOD and EMOD, any RMB,
RMD, RMQ, or equivalent directives will move the data address ahead and
leave the code address unmodified.  Outside of an actual module, both the
code and data addresses are moved ahead equally.  That last bit is critical
to understand because it means any directives that follow an EMOD directive
may have different results than other assemblers.&#13;</P
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>&#13;Additionally, within a module body, the ORG directive sets only the data
address, not the code address. However, outside a module body, ORG sets both
addresses.&#13;</P
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>Both code and data addresses are reset to 0 by the MOD directive.</P
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>&#13;As of version 4.5, LWLINK also supports creation of OS9 modules.&#13;</P
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author	William Astle <lost@l-w.ca>
date	Tue, 13 Apr 2021 15:38:12 -0600
parents	b30091890d62
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