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document how to return from assembly sim65 test

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bbbradsmith 2023-05-07 16:35:05 -04:00
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doc/sim65.sgml
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@ -126,9 +126,17 @@ a set of built-in paravirtualization functions (<ref id="paravirt-internal" name
<sect>Creating a Test in Assembly<p>
Assembly tests may similarly be assembled and linked with
<tt/--target sim6502/ or <tt/--target sim65c02/,
and the sim65 library provides an <tt/exit/ symbol that the program may <tt/JMP/
to terminate with the current A register value as an exit code.
<tt/--target sim6502/ or <tt/--target sim65c02/.
Define and export <tt/_main/ as an entry point,
and the sim65 library provides two ways to return an 8-bit exit code:
<itemize>
<item>Return from <tt/_main/ with the exit code in <tt/A/.
<item><tt/jmp exit/ with the code in <tt/A/.
</itemize>
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